<PAGE>   1
                                                                    EXHIBIT 10.6

                              SUBSIDIARIES GUARANTY


                  GUARANTY, dated as of October 15, 1999 (as amended, restated,
modified and/or supplemented from time to time, this "Guaranty"), made by each
of the undersigned (each, a "Guarantor" and, together with any other entity
which becomes a party hereto pursuant to Section 24, collectively, the
"Guarantors"). Except as otherwise defined herein, terms used herein and defined
in the Credit Agreement (as defined below) shall be used herein as therein
defined.


                              W I T N E S S E T H :


                  WHEREAS, IASIS Healthcare Corporation, a Delaware corporation
(the "Borrower"), various financial institutions from time to time party thereto
(the "Lenders"), J.P. Morgan Securities Inc. and The Bank of Nova Scotia, as
Co-Lead Arrangers and Co-Book Runners, Paribas, as Documentation Agent, The Bank
of Nova Scotia, as Syndication Agent, and Morgan Guaranty Trust Company of New
York, as Administrative Agent, have entered into a Credit Agreement, dated as of
October 15, 1999 (as amended, restated, modified and/or supplemented from time
to time, the "Credit Agreement"), providing for the making of Loans to the
Borrower, all as contemplated therein (with the Lenders, each Issuing Bank, the
Co-Arrangers, the Syndication Agent, the Administrative Agent and the Collateral
Agent being herein called the "Lender Creditors");

                  WHEREAS, the Borrower may from time to time enter into one or
more (i) interest rate protection agreements (including, without limitation,
interest rate swaps, caps, floors, collars and similar agreements), (ii) foreign
exchange contracts, currency swap agreements, commodity agreements or other
similar agreements or arrangements designed to protect against the fluctuations
in currency values and/or (iii) other types of hedging agreements from time to
time (each such agreement or arrangement with an Other Creditor (as hereinafter
defined), an "Interest Rate Protection Agreement or Other Hedging Agreement"),
with Morgan Guaranty Trust Company of New York in its individual capacity
("Morgan Guaranty"), any Lender or a syndicate of financial institutions
organized by Morgan Guaranty or any such Lender, or an affiliate of Morgan
Guaranty or any such Lender (Morgan Guaranty, any such Lender or Lenders or
affiliate or affiliates of Morgan Guaranty or such Lender or Lenders (even if
Morgan Guaranty or any such Lender ceases to be a Lender under the Credit
Agreement for any reason) and any such institution that participates in such
Interest Rate Protection Agreements or Other Hedging Agreements and their
subsequent successors and assigns, collectively, the "Other Creditors", and
together with the Lender Creditors, the "Creditors");

                  WHEREAS, each Guarantor is a direct or indirect Subsidiary of
the Borrower;
<PAGE>   2

                                                                          Page 2

                  WHEREAS, it is a condition to the making of Loans to the
Borrower and the issuance of, and participation in, Letters of Credit for the
account of the Borrower under the Credit Agreement and to the Other Creditors
entering into the Interest Rate Protection Agreements or Other Hedging
Agreements that each Guarantor shall have executed and delivered this Guaranty;
and

                  WHEREAS, each Guarantor will obtain benefits from the
assumption and/or incurrence of Loans by the Borrower and the issuance of, and
participation in, Letters of Credit for the account of the Borrower under the
Credit Agreement and the entering into of Interest Rate Protection Agreements or
Other Hedging Agreements and, accordingly, desires to execute this Guaranty in
order to satisfy the conditions described in the preceding paragraph and to
induce the Lenders to maintain and make Loans to the Borrower and issue Letters
of Credit for the account of the Borrower and the Other Creditors to maintain
and/or enter into Interest Rate Protection Agreements or Other Hedging
Agreements with the Borrower;


                  NOW, THEREFORE, in consideration of the foregoing and other
benefits accruing to each Guarantor, the receipt and sufficiency of which are
hereby acknowledged, each Guarantor hereby makes the following representations
and warranties to the Creditors and hereby covenants and agrees with each
Creditor as follows:

                  1. Each Guarantor, jointly and severally, irrevocably and
unconditionally guarantees: (i) to the Lender Creditors the full and prompt
payment when due (whether at the stated maturity, by acceleration or otherwise)
of (x) the principal of and interest on the Notes issued by, and the Loans made
to, the Borrower under the Credit Agreement and all reimbursement obligations
and Unpaid Drawings with respect to Letters of Credit and (y) all other
obligations (including obligations which, but for any automatic stay under
Section 362(a) of the Bankruptcy Code, would become due) and liabilities owing
by the Borrower to the Lender Creditors (including, without limitation,
indemnities, Fees and interest thereon) now existing or hereafter incurred
under, arising out of or in connection with the Credit Agreement or any other
Credit Document and the due performance and compliance with the terms,
conditions and agreements contained in the Credit Documents by the Borrower (all
such principal, interest, liabilities and obligations being herein collectively
called the "Credit Document Obligations"); and (ii) to each Other Creditor the
full and prompt payment when due (whether at the stated maturity, by
acceleration or otherwise) of all obligations (including obligations which, but
for any automatic stay under Section 362(a) of the Bankruptcy Code, would become
due) and liabilities owing by the Borrower to the Other Creditors (including,
without limitation, indemnities, fees and interest thereon) under any Interest
Rate Protection Agreements or Other Hedging Agreements, whether now in existence
or hereafter arising, and the due performance and compliance by the Borrower
with all terms, conditions and agreements contained therein (all such
obligations and liabilities under this clause (ii) being herein collectively
called the "Other Obligations", and together with the Credit Document
Obligations are herein collectively called the "Guaranteed Obligations"). Each
Guarantor understands, agrees and confirms that the Creditors may enforce this
Guaranty up to the full amount of the Guaranteed Obligations against
<PAGE>   3

                                                                          Page 3

each Guarantor without proceeding against any other Guarantor, the Borrower,
against any security for the Guaranteed Obligations, or against any other
guarantor under any other guaranty covering all or a portion of the Guaranteed
Obligations. This Guaranty shall constitute a guaranty of payment and not of
collection. All payments by each Guarantor under this Guaranty shall be made on
the same basis as payments by the Borrower under Sections 4.03 and 4.04 of the
Credit Agreement.

                  2. Additionally, each Guarantor, jointly and severally,
unconditionally and irrevocably, guarantees the payment of any and all
Guaranteed Obligations to the Creditors whether or not due or payable by the
Borrower upon the occurrence in respect of the Borrower of any of the events
specified in Section 10.05 of the Credit Agreement, and unconditionally and
irrevocably, jointly and severally, promises to pay such Guaranteed Obligations
to the Creditors, or order, on demand, in lawful money of the United States of
America.

                  3. The liability of each Guarantor hereunder is exclusive and
independent of any security for or other guaranty of the Guaranteed Obligations
whether executed by such Guarantor, any other Guarantor, any other guarantor or
by any other person, and the liability of each Guarantor hereunder shall not be
affected or impaired by (i) any direction as to application of payment by the
Borrower or by any other person, (ii) any other continuing or other guaranty,
undertaking or maximum liability of a guarantor or of any other person as to the
Guaranteed Obligations, (iii) any payment on or in reduction of any such other
guaranty or undertaking, (iv) any dissolution, termination or increase, decrease
or change in personnel by the Borrower, (v) any payment made to any Creditor on
the Guaranteed Obligations which any Creditor repays the Borrower pursuant to
court order in any bankruptcy, reorganization, arrangement, moratorium or other
debtor relief proceeding, and each Guarantor waives any right to the deferral or
modification of its obligations hereunder by reason of any such proceeding, (vi)
any action or inaction by the Creditors as contemplated in Section 6 hereof or
(vii) any invalidity, irregularity or unenforceability of all or part of the
Guaranteed Obligations or of any security therefor.

                  4. The obligations of each Guarantor hereunder are independent
of the obligations of any other Guarantor, any other guarantor of the Borrower
or the Borrower, and a separate action or actions may be brought and prosecuted
against each Guarantor whether or not action is brought against any other
Guarantor, any other guarantor of the Borrower or the Borrower and whether or
not any other Guarantor, any other guarantor of the Borrower or the Borrower be
joined in any such action or actions. Each Guarantor waives, to the fullest
extent permitted by law, the benefit of any statute of limitations affecting its
liability hereunder or the enforcement thereof. Any payment by the Borrower or
other circumstance which operates to toll any statute of limitations as to the
Borrower shall operate to toll the statute of limitations as to each Guarantor.

                  5. Each Guarantor hereby waives notice of acceptance of this
Guaranty and notice of any liability to which it may apply, and waives
promptness, diligence, presentment, demand of payment, protest, notice of
dishonor or nonpayment of any such liabilities, suit or taking of other
<PAGE>   4

                                                                          Page 4

action by the Administrative Agent or any other Creditor against, and any other
notice to, any party liable thereon (including such Guarantor or any other
guarantor of the Borrower).

                  6. Any Creditor may at any time and from time to time without
the consent of, or notice to, any Guarantor, without incurring responsibility to
such Guarantor, without impairing or releasing the obligations of such Guarantor
hereunder, upon or without any terms or conditions and in whole or in part:

                 (i) change the manner, place or terms of payment of, and/or
         change or extend the time of payment of, renew or alter, any of the
         Guaranteed Obligations, (including any increase or decrease in the rate
         of interest thereon), any security therefor, or any liability incurred
         directly or indirectly in respect thereof, and the guaranty herein made
         shall apply to the Guaranteed Obligations as so changed, extended,
         renewed or altered;

                (ii) take and hold security for the payment of the Guaranteed
         Obligations and/or sell, exchange, release, surrender, realize upon or
         otherwise deal with in any manner and in any order any property by
         whomsoever at any time pledged or mortgaged to secure, or howsoever
         securing, the Guaranteed Obligations or any liabilities (including any
         of those hereunder) incurred directly or indirectly in respect thereof
         or hereof, and/or any offset thereagainst;

               (iii) exercise or refrain from exercising any rights against the
         Borrower, any Guarantor, any other guarantor of the Borrower or others
         or otherwise act or refrain from acting;

                (iv) settle or compromise any of the Guaranteed Obligations, any
         security therefor or any liability (including any of those hereunder)
         incurred directly or indirectly in respect thereof or hereof, and may
         subordinate the payment of all or any part thereof to the payment of
         any liability (whether due or not) of the Borrower to creditors of the
         Borrower;

                 (v) apply any sums by whomsoever paid or howsoever realized to
         any liability or liabilities of the Borrower to the Creditors
         regardless of what liabilities of the Borrower remain unpaid;

                (vi) release or substitute any one or more endorsers,
         guarantors, Guarantors, the Borrower or other obligors;

               (vii) consent to or waive any breach of, or any act, omission or
         default under, the Interest Rate Protection Agreements or Other Hedging
         Agreements, the Credit Documents or any of the instruments or
         agreements referred to therein, or otherwise amend, modify or
         supplement any of the Interest Rate Protection Agreements or Other
         Hedging Agreements, the Credit Documents or any of such other
         instruments or agreements; and/or
<PAGE>   5

                                                                          Page 5

              (viii) act or fail to act in any manner referred to in this
         Guaranty which may deprive such Guarantor of its right to subrogation
         against the Borrower to recover full indemnity for any payments made
         pursuant to this Guaranty.

                  7. No invalidity, irregularity or unenforceability of all or
any part of the Guaranteed Obligations or of any security therefor shall affect,
impair or be a defense to this Guaranty, and this Guaranty shall be primary,
absolute and unconditional notwithstanding the occurrence of any event or the
existence of any other circumstances which might constitute a legal or equitable
discharge of a surety or guarantor except payment in full of the Guaranteed
Obligations.

                  8. This Guaranty is a continuing one and all liabilities to
which it applies or may apply under the terms hereof shall be conclusively
presumed to have been created in reliance hereon. No failure or delay on the
part of any Creditor in exercising any right, power or privilege hereunder shall
operate as a waiver thereof; nor shall any single or partial exercise of any
right, power or privilege hereunder preclude any other or further exercise
thereof or the exercise of any other right, power or privilege. The rights and
remedies herein expressly specified are cumulative and not exclusive of any
rights or remedies which any Creditor would otherwise have. No notice to or
demand on any Guarantor in any case shall entitle such Guarantor to any other
further notice or demand in similar or other circumstances or constitute a
waiver of the rights of any Creditor to any other or further action in any
circumstances without notice or demand. It is not necessary for any Creditor to
inquire into the capacity or powers of the Borrower or any of its Subsidiaries
or the officers, directors, partners or agents acting or purporting to act on
its behalf, and any indebtedness made or created in reliance upon the professed
exercise of such powers shall be guaranteed hereunder.

                  9. Any indebtedness of the Borrower now or hereafter held by
any Guarantor is hereby subordinated to the indebtedness of the Borrower to the
Creditors; and such indebtedness of the Borrower to any Guarantor, if the
Administrative Agent, after an Event of Default has occurred and is continuing,
so requests, shall be collected, enforced and received by such Guarantor as
trustee for the Creditors and be paid over to the Creditors on account of the
indebtedness of the Borrower to the Creditors, but without affecting or
impairing in any manner the liability of such Guarantor under the other
provisions of this Guaranty. Prior to the transfer by any Guarantor of any note
or negotiable instrument evidencing any indebtedness of the Borrower to such
Guarantor, such Guarantor shall mark such note or negotiable instrument with a
legend that the same is subject to this subordination. Without limiting the
generality of the foregoing, each Guarantor hereby agrees with the Creditors
that it will not exercise any right of subrogation which it may at any time
otherwise have as a result of this Guaranty (whether contractual, under Section
509 of the Bankruptcy Code or otherwise) until all Guaranteed Obligations have
been irrevocably paid in full in cash.

                  10. (a) Each Guarantor waives any right (except as shall be
required by applicable statute and cannot be waived) to require the Creditors
to: (i) proceed against the Borrower, any other Guarantor, any other guarantor
of the Borrower or any other person; (ii)
<PAGE>   6

                                                                          Page 6

proceed against or exhaust any security held from the Borrower, any other
Guarantor, any other guarantor of the Borrower or any other person; or (iii)
pursue any other remedy in the Creditors' power whatsoever. Each Guarantor
waives any defense based on or arising out of any defense of the Borrower, any
other Guarantor, any other guarantor of the Borrower or any other person other
than payment in full in cash of the Guaranteed Obligations, including, without
limitation, any defense based on or arising out of the disability of the
Borrower, any other Guarantor, any other guarantor of the Borrower or any other
person, or the unenforceability of the Guaranteed Obligations or any part
thereof from any cause, or the cessation from any cause of the liability of the
Borrower other than payment in full of the Guaranteed Obligations in cash. The
Creditors may, at their election, foreclose on any security held by the
Administrative Agent, the Collateral Agent or the other Creditors by one or more
judicial or nonjudicial sales, whether or not every aspect of any such sale is
commercially reasonable (to the extent such sale is permitted by applicable
law), or exercise any other right or remedy the Creditors may have against the
Borrower or any other person, or any security, without affecting or impairing in
any way the liability of any Guarantor hereunder except to the extent the
Guaranteed Obligations have been paid in full in cash. Each Guarantor waives any
defense arising out of any such election by the Creditors, even though such
election operates to impair or extinguish any right of reimbursement or
subrogation or other right or remedy of such Guarantor against the Borrower or
any other person or any security.

                  (b) Each Guarantor waives all presentments, demands for
performance, protests and notices, including, without limitation, notices of
nonperformance, notices of protest, notices of dishonor, notices of acceptance
of this Guaranty, and notices of the existence, creation or incurring of new or
additional indebtedness. Each Guarantor assumes all responsibility for being and
keeping itself informed of the Borrower's financial condition and assets, and of
all other circumstances bearing upon the risk of nonpayment of the Guaranteed
Obligations and the nature, scope and extent of the risks which such Guarantor
assumes and incurs hereunder, and agrees that the Creditors shall have no duty
to advise any Guarantor of information known to them regarding such
circumstances or risks.

                  (c) Until such time as the Guaranteed Obligations have been
paid in full in cash, each Guarantor hereby waives all contractual, statutory or
common law rights of reimbursement, contribution or indemnity from the Borrower
or any other Guarantor which it may at any time otherwise have as a result of
this Guaranty.

                  11. In order to induce the Lenders to make Loans and issue
Letters of Credit pursuant to the Credit Agreement, and in order to induce the
Other Creditors to execute, deliver and perform the Interest Rate Protection
Agreements or Other Hedging Agreements, each Guarantor represents, warrants and
covenants that:

                  (a) Such Guarantor (i) is a duly organized and validly
         existing legal entity and is in good standing under the laws of the
         jurisdiction of its organization, and has the requisite power and
         authority to own its property and assets and to transact the business
         in which it is engaged and presently proposes to engage and (ii) is
         duly qualified and is
<PAGE>   7

                                                                          Page 7

         authorized to do business and is in good standing in all jurisdictions
         where it is required to be so qualified except where the failure to be
         so qualified would reasonably be expected not to have a Material
         Adverse Effect.

                  (b) Such Guarantor has the requisite power and authority to
         execute, deliver and carry out the terms and provisions of this
         Guaranty and each other Document (for purposes of this Guaranty, such
         term to mean and include each Document (as defined in the Credit
         Agreement) and each Interest Rate Protection Agreement or Other Hedging
         Agreement) to which it is a party and has taken all necessary corporate
         action to authorize the execution, delivery and performance by it of
         each such Document. Such Guarantor has duly executed and delivered this
         Guaranty and each other Document to which it is a party, and each such
         Document constitutes the legal, valid and binding obligation of such
         Guarantor enforceable in accordance with its terms, except to the
         extent that the enforceability thereof may be limited by applicable
         bankruptcy, insolvency, reorganization, moratorium or similar laws
         generally affecting creditors' rights and by equitable principles
         (regardless of whether enforcement is sought in equity or law) and
         principles of good faith and fair dealing.

                  (c) Neither the execution, delivery or performance by such
         Guarantor of this Guaranty or any other Document to which it is a
         party, nor compliance by it with the terms and provisions hereof and
         thereof: (i) will contravene any applicable material provision of any
         law, statute, rule or regulation, or any order, writ, injunction or
         decree of any court or governmental instrumentality, (ii) will conflict
         or be inconsistent with or result in any breach of, any of the terms,
         covenants, conditions or provisions of, or constitute a default under,
         or (other than pursuant to the Security Documents) result in the
         creation or imposition of (or the obligation to create or impose) any
         Lien upon any of the property or assets of such Guarantor or any of its
         Subsidiaries pursuant to the terms of any indenture, mortgage, deed of
         trust, credit agreement, loan agreement or any other agreement or other
         instrument to which such Guarantor or any of its Subsidiaries is a
         party or by which it or any of its property or assets is bound or to
         which it may be subject or (iii) will violate any provision of the
         certificate of incorporation or by-laws (or equivalent organizational
         documents) of such Guarantor or any of its Subsidiaries.

                  (d) No order, consent, approval, license, authorization or
         validation of, or filing, recording or registration with, or exemption
         by, any foreign or domestic governmental or public body or authority,
         or any subdivision thereof, is required to authorize, or is required in
         connection with, (i) the execution, delivery and performance of this
         Guaranty or any other Document to which such Guarantor is a party, or
         (ii) the legality, validity, binding effect or enforceability of this
         Guaranty or any other Document to which such Guarantor is a party.

                  12. Each Guarantor covenants and agrees that on and after the
date hereof and until the termination of the Total Commitments and when no Note
or Letter of Credit remains outstanding and all other Guaranteed Obligations
have been paid in full (other than those arising
<PAGE>   8

                                                                          Page 8

from indemnities for which no request has been made), such Guarantor shall take,
or will refrain from taking, as the case may be, all actions that are necessary
to be taken or not taken so that no violation of any provision, covenant or
agreement contained in Section 8 or 9 of the Credit Agreement, and so that no
Event of Default, is caused by the actions of such Guarantor or any of its
Subsidiaries.

                  13. The Guarantors hereby jointly and severally agree to pay
all out-of-pocket costs and expenses of each Creditor in connection with the
enforcement of this Guaranty and the protection of such Creditor's rights
hereunder, and in connection with any amendment, waiver or consent relating
hereto (including, without limitation, the fees and disbursements of counsel
employed by the Administrative Agent or any of the other Creditors).

                  14. This Guaranty shall be binding upon each Guarantor and its
successors and assigns and shall inure to the benefit of the Creditors and their
successors and assigns.

                  15. Neither this Guaranty nor any provision hereof may be
changed, waived, discharged or terminated in any manner whatsoever unless in
writing duly signed by the Administrative Agent (with the consent of (x) the
Required Lenders or, to the extent required by Section 13.12 of the Credit
Agreement, all of the Lenders, at all times prior to the time at which all
Credit Document Obligations have been paid in full, or (y) the holders of at
least a majority of the outstanding Other Obligations at all times after the
time at which all Credit Document Obligations have been paid in full) and each
Guarantor directly affected thereby (it being understood that the addition or
release of any Guarantor hereunder shall not constitute a change, waiver,
discharge or termination affecting any Guarantor other than the Guarantor so
added or released); provided, that any change, waiver, modification or variance
affecting the rights and benefits of a single Class (as defined below) of
Creditors (and not all Creditors in a like or similar manner) shall require the
written consent of the Requisite Creditors (as defined below) of such Class. For
the purpose of this Guaranty, the term "Class" shall mean each class of
Creditors, i.e., whether (i) the Lender Creditors as holders of the Credit
Document Obligations or (ii) the Other Creditors as holders of the Other
Obligations. For the purpose of this Guaranty, the term "Requisite Creditors" of
any Class shall mean each of (i) with respect to the Credit Document
Obligations, the Required Lenders and (ii) with respect to the Other
Obligations, the holders of at least a majority of all obligations outstanding
from time to time under the Interest Rate Protection Agreements or Other Hedging
Agreements.

                  16. Each Guarantor acknowledges that an executed (or
conformed) copy of each of the Credit Documents and the Interest Rate Protection
Agreements or Other Hedging Agreements has been made available to its principal
executive officers and such officers are familiar with the contents thereof.

                  17. In addition to any rights now or hereafter granted under
applicable law (including, without limitation, Section 151 of the New York
Debtor and Creditor Law) and not by way of limitation of any such rights, upon
the occurrence and during the continuance of an Event of Default (such term to
mean and include any "Event of Default" as defined in the Credit
<PAGE>   9

                                                                          Page 9

Agreement or any payment default under any Interest Rate Protection Agreement or
Other Hedging Agreement and shall in any event, include, without limitation, any
payment default on any of the Guaranteed Obligations continuing after any
applicable grace period), each Creditor is hereby authorized at any time or from
time to time, without notice to any Guarantor or to any other Person, any such
notice being expressly waived, to set off and to appropriate and apply any and
all deposits (general or special) and any other indebtedness at any time held or
owing by such Creditor to or for the credit or the account of such Guarantor,
against and on account of the obligations and liabilities of such Guarantor to
such Creditor under this Guaranty, irrespective of whether or not such Creditor
shall have made any demand hereunder and although said obligations, liabilities,
deposits or claims, or any of them, shall be contingent or unmatured. Each
Creditor acknowledges and agrees that the provisions of this Section 17 are
subject to the sharing provisions set forth in Section 13.06(b) of the Credit
Agreement.

                  18. All notices, requests, demands or other communications
pursuant hereto shall be deemed to have been duly given or made when delivered
to the Person to which such notice, request, demand or other communication is
required or permitted to be given or made under this Guaranty, addressed to such
party at (i) in the case of any Lender Creditor, as provided in the Credit
Agreement, (ii) in the case of any Guarantor, at:

                  c/o IASIS Healthcare Corporation
                  Suite 101
                  104 Woodmont Boulevard
                  Nashville, TN  37205
                  Tel:  [            ]
                  Fax:  (615) 846-3006

and (iii) in the case of any Other Creditor, at such address as such Other
Creditor shall have specified in writing to the Guarantor; or in any case at
such other address as any of the foregoing Persons may hereafter notify the
others in writing.

                  19. If claim is ever made upon any Creditor for repayment or
recovery of any amount or amounts received in payment or on account of any of
the Guaranteed Obligations and any of said Creditors repays all or part of said
amount by reason of (i) any judgment, decree or order of any court or
administrative body having jurisdiction over such Creditor or any of its
property or (ii) any settlement or compromise of any such claim effected by such
Creditor with any such claimant (including the Borrower), then and in such event
each Guarantor agrees that any such judgment, decree, order, settlement or
compromise shall be binding upon such Guarantor, notwithstanding any revocation
hereof or the cancellation of any Note or any Interest Rate Protection Agreement
or Other Hedging Agreement or other instrument evidencing any liability of the
Borrower, and such Guarantor shall be and remain liable to such Creditor
hereunder for the amount so repaid or recovered to the same extent as if such
amount had never originally been received by any such Creditor.
<PAGE>   10

                                                                         Page 10

                  20. (A) THIS GUARANTY AND THE RIGHTS AND OBLIGATIONS OF THE
CREDITORS AND OF THE UNDERSIGNED HEREUNDER SHALL BE GOVERNED BY AND CONSTRUED IN
ACCORDANCE WITH THE LAW OF THE STATE OF NEW YORK.

                  (B) ANY LEGAL ACTION OR PROCEEDING WITH RESPECT TO THIS
GUARANTY OR ANY OTHER CREDIT DOCUMENT TO WHICH ANY GUARANTOR IS A PARTY MAY BE
BROUGHT IN THE COURTS OF THE STATE OF NEW YORK OR OF THE UNITED STATES OF
AMERICA FOR THE SOUTHERN DISTRICT OF NEW YORK, AND, BY EXECUTION AND DELIVERY OF
THIS GUARANTY, EACH GUARANTOR HEREBY IRREVOCABLY ACCEPTS FOR ITSELF AND IN
RESPECT OF ITS PROPERTY, GENERALLY AND UNCONDITIONALLY, THE JURISDICTION OF THE
AFORESAID COURTS. EACH GUARANTOR FURTHER IRREVOCABLY CONSENTS TO THE SERVICE OF
PROCESS OUT OF ANY OF THE AFOREMENTIONED COURTS IN ANY SUCH ACTION OR PROCEEDING
BY THE MAILING OF COPIES THEREOF BY REGISTERED OR CERTIFIED MAIL, POSTAGE
PREPAID, TO EACH GUARANTOR AT ITS ADDRESS SET FORTH OPPOSITE ITS SIGNATURE
BELOW, SUCH SERVICE TO BECOME EFFECTIVE 30 DAYS AFTER SUCH MAILING. EACH
GUARANTOR HEREBY IRREVOCABLY WAIVES ANY OBJECTION TO SUCH SERVICE OF PROCESS AND
FURTHER IRREVOCABLY WAIVES AND AGREES NOT TO PLEAD OR CLAIM IN ANY ACTION OR
PROCEEDING COMMENCED HEREUNDER OR UNDER ANY OTHER CREDIT DOCUMENT TO WHICH SUCH
GUARANTOR IS A PARTY THAT SERVICE OF PROCESS WAS IN ANY WAY INVALID OR
INEFFECTIVE. NOTHING HEREIN SHALL AFFECT THE RIGHT OF ANY OF THE CREDITORS TO
SERVE PROCESS IN ANY OTHER MANNER PERMITTED BY LAW OR TO COMMENCE LEGAL
PROCEEDINGS OR OTHERWISE PROCEED AGAINST EACH GUARANTOR IN ANY OTHER
JURISDICTION.

                  (C) EACH GUARANTOR HEREBY IRREVOCABLY WAIVES ANY OBJECTION
WHICH IT MAY NOW OR HEREAFTER HAVE TO THE LAYING OF VENUE OF ANY OF THE
AFORESAID ACTIONS OR PROCEEDINGS ARISING OUT OF OR IN CONNECTION WITH THIS
GUARANTY OR ANY OTHER CREDIT DOCUMENT BROUGHT IN THE COURTS REFERRED TO IN
CLAUSE (B) ABOVE AND HEREBY FURTHER IRREVOCABLY WAIVES AND AGREES NOT TO PLEAD
OR CLAIM IN ANY SUCH COURT THAT SUCH ACTION OR PROCEEDING BROUGHT IN ANY SUCH
COURT HAS BEEN BROUGHT IN AN INCONVENIENT FORUM.

                  (D) EACH GUARANTOR HEREBY IRREVOCABLY WAIVES ALL RIGHTS TO A
TRIAL BY JURY IN ANY ACTION, PROCEEDING OR COUNTERCLAIM ARISING OUT OF OR
RELATING TO THIS GUARANTY, THE
<PAGE>   11

                                                                         Page 11

OTHER CREDIT DOCUMENTS OR THE TRANSACTIONS CONTEMPLATED HEREBY OR THEREBY.

                  21. In the event that all of the capital stock or other equity
interests of one or more Guarantors is sold or otherwise disposed of (to a
Person other than the Borrower or a Subsidiary thereof) or liquidated in
compliance with the requirements of Section 9.02 of the Credit Agreement (or
such sale, disposition or liquidation has been approved in writing by the
Required Lenders (or all Lenders if required by Section 13.12 of the Credit
Agreement)) and the proceeds of such sale, disposition or liquidation are
applied in accordance with the provisions of the Credit Agreement, to the extent
applicable, such Guarantor and each Guarantor which is a Subsidiary of such
Guarantor shall be released from this Guaranty and this Guaranty shall, as to
each such Guarantor or Guarantors, terminate, and have no further force or
effect (it being understood and agreed that the sale of one or more Persons that
own, directly or indirectly, all of the capital stock of any Guarantor shall be
deemed to be a sale of such Guarantor for the purposes of this Section 21).

                  22. All payments made by any Guarantor hereunder will be made
without setoff, counterclaim or other defense.

                  23. This Guaranty may be executed in any number of
counterparts and by the different parties hereto on separate counterparts, each
of which when so executed and delivered shall be an original, but all of which
shall together constitute one and the same instrument. A set of counterparts
executed by all the parties hereto shall be lodged with the Borrower and the
Administrative Agent.

                  24. It is understood and agreed that any Subsidiary of the
Borrower that is required to execute a counterpart of this Guaranty pursuant to
the Credit Agreement shall automatically become a Guarantor hereunder by
executing a counterpart hereof and delivering the same to the Administrative
Agent.

                  25. Notwithstanding anything else to the contrary in this
Guaranty, the Creditors agree that this Guaranty may be enforced only by the
action of the Administrative Agent or the Collateral Agent, in each case acting
upon the instructions of the Required Lenders (or, after the date on which all
Credit Document Obligations have been paid in full, the holders of at least a
majority of the outstanding Other Obligations), and that no other Creditor shall
have any right individually to seek to enforce or to enforce this Guaranty or to
realize upon the security to be granted by the Security Documents, it being
understood and agreed that such rights and remedies may be exercised by the
Administrative Agent or the Collateral Agent or the holders of at least a
majority of the outstanding Other Obligations, as the case may be, for the
benefit of the Creditors upon the terms of this Guaranty and the Security
Documents. The Creditors further agree that this Guaranty may not be enforced
against any director, officer, employee, or stockholder of any Guarantor (except
to the extent such stockholder is also a Guarantor hereunder). It is understood
that the agreement in this Section 25 is among and solely for the benefit of the
Lenders and that if
<PAGE>   12

                                                                         Page 12

the Required Lenders so agree (without requiring the consent of any Guarantor),
this Guaranty may be directly enforced by any Creditor.

                  26. At any time a payment in respect of the Guaranteed
Obligations is made under this Guaranty, the right of contribution of each
Guarantor hereunder against each other such Guarantor shall be determined as
provided in the immediately following sentence, with the right of contribution
of each Guarantor to be revised and restated as of each date on which a payment
(a "Relevant Payment") is made on the Guaranteed Obligations under this
Guaranty. At any time that a Relevant Payment is made by a Guarantor that
results in the aggregate payments made by such Guarantor hereunder in respect of
the Guaranteed Obligations to and including the date of the Relevant Payment
exceeding such Guarantor's Contribution Percentage (as defined below) of the
aggregate payments made by all Guarantors hereunder in respect of the Guaranteed
Obligations to and including the date of the Relevant Payment (such excess, the
"Aggregate Excess Amount"), each such Guarantor shall have a right of
contribution against each other Guarantor who has made payments hereunder in
respect of the Guaranteed Obligations to and including the date of the Relevant
Payment in an aggregate amount less than such other Guarantor's Contribution
Percentage of the aggregate payments made to and including the date of the
Relevant Payment by all Guarantors hereunder in respect of the Guaranteed
Obligations (the aggregate amount of such deficit, the "Aggregate Deficit
Amount") in an amount equal to (x) a fraction the numerator of which is the
Aggregate Excess Amount of such Guarantor and the denominator of which is the
Aggregate Excess Amount of all Guarantors multiplied by (y) the Aggregate
Deficit Amount of such other Guarantor. A Guarantor's right of contribution
pursuant to the preceding sentences shall arise at the time of each computation,
subject to adjustment to the time of any subsequent computation; provided, that
no Guarantor may take any action to enforce such right until the Guaranteed
Obligations have been paid in full and the Total Commitments have been
terminated, it being expressly recognized and agreed by all parties hereto that
any Guarantor's right of contribution arising pursuant to this Guaranty against
any other Guarantor shall be expressly junior and subordinate to such other
Guarantor's obligations and liabilities in respect of the Guaranteed Obligations
and any other obligations owing under this Guaranty. As used in this Section 26:
(i) each Guarantor's "Contribution Percentage" shall mean the percentage
obtained by dividing (x) the Adjusted Net Worth (as defined below) of such
Guarantor by (y) the aggregate Adjusted Net Worth of all Guarantors; (ii) the
"Adjusted Net Worth" of each Guarantor shall mean the greater of (x) the Net
Worth (as defined below) of such Guarantor and (y) zero; and (iii) the "Net
Worth" of each Guarantor shall mean the amount by which the fair salable value
of such Guarantor's assets on the date of any Relevant Payment exceeds its
existing debts and other liabilities (including contingent liabilities, but
without giving effect to any Guaranteed Obligations arising under this Guaranty)
on such date. All parties hereto recognize and agree that, except for any right
of contribution arising pursuant to this Section 26, each Guarantor who makes
any payment in respect of the Guaranteed Obligations shall have no right of
contribution or subrogation against any other Guarantor in respect of such
payment. Each of the Guarantors recognizes and acknowledges that the rights to
contribution arising hereunder shall constitute an asset in favor of the party
entitled to such contribution. In this connection, each Guarantor has the right
to waive its contribution right against any
<PAGE>   13

                                                                         Page 13

Guarantor to the extent that after giving effect to such waiver such Guarantor
would remain solvent, in the determination of the Required Lenders.

                  27. Each Guarantor hereby confirms that it is its intention
that this Guaranty not constitute a fraudulent transfer or conveyance for
purposes of any bankruptcy, insolvency or similar law, the Uniform Fraudulent
Conveyance Act or any similar Federal, state of foreign law. To effectuate the
foregoing intention, each Guarantor hereby irrevocably agrees that the
Guaranteed Obligations shall be limited to the maximum amount as will, after
giving effect to such maximum amount and all other (contingent or otherwise)
liabilities of such Guarantor that are relevant under such laws, result in the
Guaranteed Obligations of such Guarantor in respect of such maximum amount not
constituting a fraudulent transfer or conveyance.

                  28. EACH GUARANTOR WARRANTS AND AGREES THAT EACH OF THE
WAIVERS SET FORTH ABOVE IS MADE WITH FULL KNOWLEDGE OF ITS SIGNIFICANCE AND
CONSEQUENCES AND THAT IF ANY OF SUCH WAIVERS ARE DETERMINED TO BE CONTRARY TO
ANY APPLICABLE LAW OR PUBLIC POLICY, SUCH WAIVERS SHALL BE EFFECTIVE ONLY TO THE
MAXIMUM EXTENT PERMITTED BY LAW.

                  29. This guaranty, including, without limitation, the
representations, warranties and covenants contained herein, shall become
effective when the Collateral Agent, the Borrower and each subsidiary of the
Borrower whose name appears on the signature pages hereto shall have signed a
counterpart hereof (whether the same or different counterparts) and shall have
delivered (including by way of facsimile transmission) the same to the
Administrative Agent at its notice office or the offices of its counsel.
<PAGE>   14
                  IN WITNESS WHEREOF, each Guarantor has caused this Guaranty to
be executed and delivered as of the date first above written.


                                       IASIS HEALTHCARE CORPORATION



                                       By: /s/ Wayne Gower
                                          ------------------------------------
                                          Name: Wayne Gower
                                          Title: President & Chief Executive
                                                  Officer


                                       SALT LAKE REGIONAL MEDICAL CENTER, INC.,
                                         as a Guarantor



                                       By: /s/ Wayne Gower
                                          ------------------------------------
                                          Name: Wayne Gower
                                          Title: President & Chief Executive
                                                  Officer


                                       JORDAN VALLEY HOSPITAL, INC., as a
                                         Guarantor



                                       By: /s/ Wayne Gower
                                          ------------------------------------
                                          Name: Wayne Gower
                                          Title: President & Chief Executive
                                                  Officer


                                       DAVIS HOSPITAL & MEDICAL CENTER, INC.,
                                         as a Guarantor



                                       By: /s/ Wayne Gower
                                          ------------------------------------
                                          Name: Wayne Gower
                                          Title: President & Chief Executive
                                                  Officer


                                       ROCKY MOUNTAIN MEDICAL CENTER, INC., as
                                         a Guarantor



                                       By: /s/ Wayne Gower
                                          ------------------------------------
                                          Name: Wayne Gower
                                          Title: President & Chief Executive
                                                  Officer

<PAGE>   15
                                       PIONEER VALLEY HOSPITAL, INC., as a
                                         Guarantor



                                       By: /s/ Wayne Gower
                                          ----------------------------------
                                          Name: Wayne Gower
                                          Title: President & Chief Executive
                                                  Officer


                                       PIONEER VALLEY HEALTH PLAN, INC., as
                                         a Guarantor



                                       By: /s/ Wayne Gower
                                          ----------------------------------
                                          Name: Wayne Gower
                                          Title: President & Chief Executive
                                                  Officer


                                       CLINICARE OF UTAH, INC., as a Guarantor



                                       By: /s/ Wayne Gower
                                          ----------------------------------
                                          Name: Wayne Gower
                                          Title: President & Chief Executive
                                                  Officer


                                       SOUTHRIDGE PLAZA HOLDINGS, INC., as
                                         a Guarantor



                                       By: /s/ Wayne Gower
                                          ----------------------------------
                                          Name: Wayne Gower
                                          Title: President & Chief Executive
                                                  Officer


                                       SANDY CITY HOLDINGS, INC., as a Guarantor



                                       By: /s/ Wayne Gower
                                          ----------------------------------
                                          Name: Wayne Gower
                                          Title: President & Chief Executive
                                                  Officer


                                       DAVIS SURGICAL CENTER HOLDINGS, INC., as
                                         a Guarantor
<PAGE>   16
                                       By: /s/ Wayne Gower
                                          ------------------------------------
                                          Name: Wayne Gower
                                          Title: President & Chief Executive
                                                  Officer


                                       MESA GENERAL HOSPITAL, LP, as a Guarantor



                                       By: /s/ Wayne Gower
                                          ------------------------------------
                                          Name: Wayne Gower
                                          Title: President & Chief Executive
                                                  Officer


                                       ST. LUKE'S MEDICAL CENTER, LP, as a
                                         Guarantor



                                       By: /s/ Wayne Gower
                                          ------------------------------------
                                          Name: Wayne Gower
                                          Title: President & Chief Executive
                                                  Officer


                                       ST. LUKE'S BEHAVIORAL HOSPITAL, LP, as a
                                         Guarantor



                                       By: /s/ Wayne Gower
                                          ------------------------------------
                                          Name: Wayne Gower
                                          Title: President & Chief Executive
                                                  Officer


                                       HEALTH CHOICE ARIZONA, INC., as a
                                         Guarantor



                                       By: /s/ Wayne Gower
                                          ------------------------------------
                                          Name: Wayne Gower
                                          Title: President & Chief Executive
                                                  Officer


                                       METRO AMBULATORY SURGERY CENTER, INC.,
                                         as a Guarantor
<PAGE>   17
                                       By: /s/ Wayne Gower
                                          -------------------------------------
                                          Name: Wayne Gower
                                          Title: President & Chief Executive
                                                  Officer


                                       BILTMORE SURGERY CENTER, INC., as a
                                         Guarantor



                                       By: /s/ Wayne Gower
                                          -------------------------------------
                                          Name: Wayne Gower
                                          Title: President & Chief Executive
                                                  Officer


                                       PALMS OF PASADENA HOSPITAL, LP, as a
                                         Guarantor



                                       By: /s/ Wayne Gower
                                          -------------------------------------
                                          Name: Wayne Gower
                                          Title: President & Chief Executive
                                                  Officer


                                       ODESSA REGIONAL HOSPITAL, LP, as a
                                         Guarantor



                                       By: /s/ Wayne Gower
                                          -------------------------------------
                                          Name: Wayne Gower
                                          Title: President & Chief Executive
                                                  Officer


                                       TEMPE ST. LUKE'S HOSPITAL, LP, as a
                                         Guarantor



                                       By: /s/ Wayne Gower
                                          -------------------------------------
                                          Name: Wayne Gower
                                          Title: President & Chief Executive
                                                  Officer
<PAGE>   18
                                       MEMORIAL HOSPITAL OF TAMPA, LP, as a
                                         Guarantor



                                       By: /s/ Wayne Gower
                                          ------------------------------------
                                          Name: Wayne Gower
                                          Title: President & Chief Executive
                                                  Officer


                                       TOWN & COUNTRY HOSPITAL, LP, as a
                                         Guarantor



                                       By: /s/ Wayne Gower
                                          ------------------------------------
                                          Name: Wayne Gower
                                          Title: President & Chief Executive
                                                  Officer


                                       SOUTHWEST GENERAL HOSPITAL, LP, as a
                                         Guarantor



                                       By: /s/ Wayne Gower
                                          ------------------------------------
                                          Name: Wayne Gower
                                          Title: President & Chief Executive
                                                  Officer


                                       SSJ ST. PETERSBURG HOLDINGS, INC., as a
                                         Guarantor



                                       By: /s/ Wayne Gower
                                          ------------------------------------
                                          Name: Wayne Gower
                                          Title: President & Chief Executive
                                                  Officer


                                       FIRST CHOICE PHYSICIANS NETWORK HOLDINGS,
                                         INC., as a Guarantor



                                       By: /s/ Wayne Gower
                                          ------------------------------------
                                          Name: Wayne Gower
                                          Title: President & Chief Executive
                                                  Officer
<PAGE>   19
                                       BAPTIST JOINT VENTURE HOLDINGS, INC., as
                                         a Guarantor



                                       By: /s/ Wayne Gower
                                          -----------------------------------
                                          Name: Wayne Gower
                                          Title: President & Chief Executive
                                                  Officer


                                       BEAUMONT HOSPITAL HOLDINGS, INC., as a
                                         Guarantor



                                       By: /s/ Wayne Gower
                                          -----------------------------------
                                          Name: Wayne Gower
                                          Title: President & Chief Executive
                                                  Officer


                                       IASIS HEALTHCARE HOLDINGS, INC., as a
                                         Guarantor



                                       By: /s/ Wayne Gower
                                          -----------------------------------
                                          Name: Wayne Gower
                                          Title: President & Chief Executive
                                                  Officer


                                       IASIS MANAGEMENT COMPANY, as a Guarantor



                                       By: /s/ Wayne Gower
                                          -----------------------------------
                                          Name: Wayne Gower
                                          Title: President & Chief Executive
                                                  Officer



MORGAN GUARANTY TRUST
     COMPANY OF NEW YORK,
     as Administrative Agent for the Lenders



By: /s/ Colleen Galle
   -------------------------------------
     Name: Colleen Galle
     Title: Vice President
<PAGE>   20
                                       BILTMORE SURGERY CENTER, INC. (ARIZONA
                                         CORPORATION), as a Guarantor



                                       By: /s/ Wayne Gower
                                          -------------------------------------
                                          Name: Wayne Gower
                                          Title: President & Chief Executive
                                                  Officer
<PAGE>   21
                                       IASIS HEALTHCARE MSO SUB OF SALT LAKE
                                         CITY, LLC, as a Guarantor



                                       By: /s/ Wayne Gower
                                          ------------------------------------
                                          Name: Wayne Gower
                                          Title: President & Chief Executive
                                                  Officer