Document:

<PAGE>

                                  EXHIBIT 10.22

                  AMENDMENT NO. 4 TO MASTER AGREEMENT TO LEASE

      This Amendment No. 4 (hereinafter "Amendment 4") is made to that certain
Master Agreement to Lease between National Health Investors, Inc. ("Landlord")
and National HealthCare L.P. ("Tenant") dated October 17, 1991, (hereinafter
"Master Lease"), and is entered into effective the 31st day of December, 1997.

      WHEREAS, pursuant to the terms of the Master Lease, National HealthCare
L.P. ("NHC") has heretofore agreed to lease certain licensed nursing homes or
retirement centers in 43 locations as identified on Exhibit A to said Master
Lease; and

      WHEREAS, NHC has obtained a Certificate of Need to expand the number of
licensed beds and ancillary space in the project located in Hendersonville, TN;
and

      WHEREAS, pursuant to resolution, the Board of National Health Investors,
Inc. ("NHI") has agreed to finance said expansions and NHC has agreed to pay an
increased lease rate thereon, all on the following terms and conditions; and

      NOW, THEREFORE, IN CONSIDERATION OF THE PREMISES, the parties do hereby
amend the Master Lease by the addition of the following as paragraph 2.07:

      2.07: Expanded Project. Landlord and Tenant hereby agree that Tenant is
      granted the right to increase the licensed bed capacity and/or create
      revenue producing ancillary space at the Leased Property located in
      Hendersonville, TN, so long as the expansion is authorized with a
      certificate of need from the appropriate governmental authority and is
      constructed in a substantially similar manner as the existing Leased
      Property. Landlord agrees, at the request of Tenant from time to time, to
      reimburse Tenant for such hard costs, including land, construction,
      landscaping, fixtures or appurtenances, and capitalized interest incurred
      during construction as Tenant may have incurred in the expansion of the
      Project. At such time as this reimbursement is sought by Tenant, Tenant
      agrees to amend the individual lease for that Leased Property, and to
      increase the base rent thereon by an annual factor equal to 9.5% times the
      cost and expense reimbursed by Landlord.

      The parties further agree that the Additional Rent provided for in
      paragraph 2.02 above shall commence on that part of the Leased Property
      expanded pursuant to the terms of this paragraph 2.07 effective the first
      day of January of 1999, with 1998 as the Base Year.

      All the rest and residue of the Master Lease and the individual lease on
the Leased Property located in Hendersonville, TN, is hereby ratified and
affirmed. Executed effective this the 31st day of December, 1997.

      LANDLORD:         NATIONAL HEALTH INVESTORS, INC.

                        /s/ Richard F. LaRoche, Jr.
                        Richard F. LaRoche, Jr., Vice President

      TENANT:           NATIONAL HEALTHCARE L.P.

                        /s/ Robert G. Adams
                        Robert G. Adams, Senior Vice President<PAGE>

                                  EXHIBIT 10.23

                  AMENDMENT NO. 5 TO MASTER AGREEMENT TO LEASE

      This Amendment No. 5 (hereinafter "5th Amendment") is made to that certain
Master Agreement to Lease between National Health Investors, Inc. ("Landlord" or
"NHI") and National HealthCare Corporation ("Tenant" or "NHC") dated October 17,
1991 (hereinafter "Master Lease") and is entered into on this the 27th day of
December, 2005, to be effective January 1, 2007.

      PRELIMINARY STATEMENTS:

      A. WHEREAS, pursuant to the terms of the Master Lease, National HealthCare
Corporation ("NHC") has leased certain licensed nursing centers, assisted living
or retirement facilities in forty-one geographical locations (hereinafter
"Leased Property" or "Leased Properties") as identified on Exhibit A to said
Master Lease; and

      B. WHEREAS, the Master Lease contains a provision for a five year "Second
Renewal Term" which shall commence on January 1, 2007; and

      C. WHEREAS, the parties, by Independent Directors Committees, have entered
into negotiations and now finalized the terms and conditions of the Second
Renewal Term; and

      D. WHEREAS, the parties have heretofore deleted from the terms of the
Master Lease two (2) Leased Properties, namely NHC HealthCare, Nashville and NHC
HealthCare, Dawson Springs;

      NOW, THEREFORE, IN CONSIDERATION OF THE PREMISES the parties do hereby
amend the Master Lease as follows:

      1. Section 1.03 is amended as follows:

      1.03 Term. "Second Renewal Term" shall mean a fifteen year term commencing
on January 1, 2007, which Second Renewal Term is hereby exercised by Tenant and
accepted by Landlord. Additionally, Tenant shall have the option to renew the
Master Lease for three (3) further five-year terms commencing January 1, 2022
(the "Third Renewal Term"), January 1, 2027 (the "Fourth Renewal Term"), and
January 1, 2032 (the "Fifth Renewal Term") for the Base Rent as described in
Section 2.01.01(b). Finally, six months written notice in advance must be given
by NHC to NHI to exercise the Third, Fourth and Fifth Renewal Terms as described
above, prior to the expiration of the then term; Tenant may not renew any
successive renewal term if it is in default under the Master Lease or any
amendments thereto.

      2. Section 2.01.01 shall be deleted in its entirety with the following to
be substituted in lieu thereof:

      2.01.01(a) Base Rent During Second Renewal Term. The total Base Rent for
all Leased Properties during the Second Renewal Term shall aggregate $33,700,000
as allocated among the various Leased Properties by a schedule attached to this
5th Amendment as Schedule A-2.

      2.01.01(b) Base Rent During Third, Fourth and Fifth Renewal Terms. The
Base Rent for each Leased Property during the Third, Fourth and Fifth Renewal
Terms shall be the then Fair Rental Value of such Leased Property as negotiated
between the parties, and determined without including any value attributable to
any improvements to the Leased Property, voluntarily made by Tenant at its
expense.

      3. Article 2 specifically and the Master Lease in general is hereby
amended by deleting all references to the term "Assumed Mortgage Debt Service
Rent."

      4. Section 2.06 is deleted in its entirety with the following being
substituted in lieu thereof:

      2.06 Percentage Rent. In addition to the Base Rent with respect to each
Lease Year after 2007, Tenant shall pay Landlord Percentage Rent ("Percentage
Rent") in accordance with this Section 2.06 equal to 4% of the amount by which
the Gross Revenues (as defined in Article 2.06.01) of each Leased Property in
the applicable Lease Year exceeds the Gross Revenues of such Leased Property
during 2007.

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      5. Article 6 is hereby amended by the addition of the following Section
6.05:

      6.05 Hiring Each Other's Employees. Landlord and its affiliates agree that
they will not induce by personal contact or personally initiated third party
contact with any employee of NHC (other than Andrew Adams) or its affiliates to
leave the employment of NHC or affiliates, without the express written consent
of NHC or its affiliates.

      6. Section 9.02 is hereby amended by the deletion of reference to "Assumed
Mortgage Debt" and additionally in subparagraph (a) the deletion of a reference
to "3% per annum" and the deletion of the year "1992", with the substitution
therein of "4% per annum" and the year of "2007," respectively.

      7. Article 13 is hereby amended by adding the following as 13.01.01:

      13.01.01 Management Contracts. Landlord agrees to offer Tenant a Right of
First Refusal on any properties on which it intends to retain a third party
manager in any county where Landlord leases projects to Tenant. This offer may
be made no more than sixty (60) days in advance of potential management
changeover. Tenant has ten (10) business days to accept or reject the offer. If
rejected and if Landlord has received a management contract offer from a third
party with any different economic terms, NHI will give NHC five (5) days from
receipt of written notification sent by certified mail to accept same on
identical terms and conditions. Failure by Tenant to respond will be deemed a
denial by Tenant.

      8. Article 13 is hereby amended by adding the following as Section 13.02:

      13.02 Right of First Refusal on NHI Development Projects. Landlord and
Tenant do hereby agree that NHI will extend to NHC a Right of First Refusal on
NHI Development Projects in any county in which NHC now operates or manages a
NHC Health Care Center, in accordance with the definitions and terms of this
Right of First Refusal Procedure as hereinafter set forth.

      A.    RIGHT OF FIRST REFUSAL PROCEDURES shall mean the following:

            (i)   Upon NHI delivering a Written Offer to NHC on a NHI
                  Development Project, NHC shall have ten (10) business days
                  from receipt of a certified mailing to accept or reject the
                  Written Offer by written instrument. The failure of NHC to
                  accept or reject the Written Offer by the normal close of
                  business on the tenth (10) business day from the date of
                  receipt shall be deemed a rejection thereof.

            (ii)  Subsequently if NHI has a third party offer, which it is
                  willing to accept and which changes in any economic manner the
                  terms of the original Written Offer, then NHI must re-offer
                  the Written Offer on the changed terms and conditions to NHC,
                  which shall have five business days from the receipt by Tenant
                  of the certified mailing to accept or reject in writing the
                  changed terms. A failure to accept or reject in writing by the
                  close of business on the fifth business day from the date of
                  receipt shall be deemed a rejection.

      B.    DEFINITIONS.

            (i)   "NHI DEVELOPMENT PROJECT(S)" shall mean the development of
                  skilled or intermediate nursing centers, assisted living
                  facilities and/or independent living projects on which NHI or
                  its affiliates have purchased or contracted for property,
                  architectural plans and/or a finalized construction contract,
                  which NHI then offers to sell to or finance for a third party
                  operator.

            (ii)  "NHC HEALTH CARE CENTER(S)" means any licensed skilled or
                  intermediate nursing center, assisted living facility or
                  independent living units free-standing or attached to either
                  an assisted living, skilled, or intermediate nursing facility
                  owned or managed by NHC.

            (iii) "WRITTEN OFFER" means a written transmittal, sent by certified
                  mail by NHI to NHC, which states the definitive terms upon
                  which NHI would engage in a sale-leaseback or

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                  mortgage financing of a NHI Development Project, which
                  definitive offer must include at the very least a) the total
                  purchase price or amount financed, b) the rate of interest or
                  lease payment amount, c) a term of years for the lease and/or
                  mortgage, and d) a description of the NHI Development Project,
                  including square footage, number of beds, apartments or units
                  and, to the extent that it is then known by NHI, a physical
                  address.

      C.    PENALTY.

            Should either party breach this Right of First Refusal then it
            agrees to reimburse the other party reasonable attorneys' fees,
            costs and expenses incurred by it in a successful enforcement action
            brought by one party against the other.

      9. Section 18.01 is hereby amended by deleting the notice names and
addresses and substituting the following in lieu thereof:

       If to Tenant:                   National HealthCare Corporation
                                       100 Vine Street, Suite 1400
                                       Murfreesboro, TN  37130

       With a copy to:   Office of General Counsel
                                       National HealthCare Corporation
                                       100 Vine Street, Suite 1400
                                       Murfreesboro, TN  37130

       If to Landlord:                 National Health Investors, Inc.
                                       750 South Church Street, Suite B
                                       Murfreesboro, TN  37130

      10. Section 18.17 (Guarantee Fee Credit) is hereby deleted in its
entirety.

      11. Section 18.25 is hereby added as follows:

            18.25 Amendments to Master Lease Agreement Incorporated. The
amendments to the provisions of the Master Lease Agreement provided for herein
are hereby incorporated in and made a part of each short-form Lease Agreement of
the Leased Property.

      12. Schedule A is amended by deletion of the original Schedule A and the
substitution of the attached Schedule A-1 in lieu thereof:

      IN WITNESS WHEREOF, the parties have executed this 5th Amendment as of the
date set forth above.

                           NATIONAL HEALTH INVESTORS, INC.

                           By: /s/ W. Andrew Adams
                               W. Andrew Adams, President

                           NATIONAL HEALTHCARE CORPORATION

                           By: /s/ R. Michael Ussery
                               R. Michael Ussery, Sr. V.P., Operations
Witnessed by:

/s/ Barbara Harris
Barbara Harris

                                       3
<PAGE>

                                  Schedule A-1

Tennessee Centers:

NHC HealthCare, Athens
1204 Frye Street
Athens, TN  37303

NHC HealthCare, Chattanooga
2700 Parkwood Avenue
Chattanooga, TN  37404-1729

NHC HealthCare, Columbia
101 Walnut Lane
Columbia, TN  38401

NHC HealthCare, Dickson
812 N. Charlotte Street
Dickson, TN  37055

NHC HealthCare, Franklin
216 Fairground Street
Franklin, TN  37064

NHC HealthCare, Hendersonville
370 Old Shackle Island Road
Hendersonville, TN  37075

NHC HealthCare, Hillview
2710 Trotwood Avenue
Columbia, TN  38401

NHC HealthCare, Johnson City
3209 Bristol Hwy.
Johnson City, TN  37601

NHC HealthCare, Knoxville
809 E. Emerald Avenue
Knoxville, TN  37917

NHC HealthCare, Lewisburg
1653 Mooresville Hwy.
Lewisburg, TN  37091

NHC HealthCare, McMinnville
928 Old Smithville Road
McMinnville, TN  37110

NHC HealthCare, Milan
8017 Dogwood Lane
Milan, TN  38358

NHC HealthCare, Oakwood
244 Oakwood Drive
Lewisburg, TN  37091

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<PAGE>

NHC HealthCare, Pulaski
992 E. College Street
Pulaski, TN  38478

NHC HealthCare, Scott
2380 Buffalo Road
Lawrenceburg, TN  38464

NHC HealthCare, Sequatchie
405 Dell Trail
Dunlap, TN  37327

NHC HealthCare, Smithville
825 Fisher Avenue
Smithville, TN  38068

NHC HealthCare, Somerville
308 Lake Drive
Somerville, TN  38068

NHC HealthCare, Sparta
34 Gracey Street
Sparta, TN  38583

NHC HealthCare, Springfield
608 8th Avenue East
Springfield, TN  37172

Missouri Centers:

NHC HealthCare, Desloge
801 Brim Street
Desloge, MO  63601

NHC HealthCare, Joplin
2700 E. 34th Street
Joplin, MO  64804

NHC HealthCare, Kennett
1120 Falcon Drive
Kennett, MO  63857-0696

NHC HealthCare, Maryland Heights
2920 Fee Fee Road
Maryland Heights, MO  63043

NHC HealthCare, St. Charles
35 Sugar Maple Lane
St. Charles, MO  63303

Florida Centers:

NHC HealthCare, Hudson
7210 Beacon Woods Drive
Hudson, FL  34667

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<PAGE>

NHC HealthCare, Merritt Island
500 Crockett Blvd.
Merritt Island, FL  32953

NHC HealthCare, Plant City
701 North Wilder Road
Plant City, FL  33566

NHC HealthCare, Stuart
800 SE Central Pkwy.
Stuart, FL  34994

Kentucky Centers:

NHC HealthCare, Glasgow
Homewood Blvd.
Glasgow, KY  42141

NHC HealthCare, Madisonville
419 North Seminary Street
Madisonville, KY  42431

South Carolina Centers:

NHC HealthCare, Anderson
1501 East Greenville Street
Anderson, SC  29621

NHC HealthCare, Greenwood
437 East Cambridge Avenue
Greenwood, SC  29646

NHC HealthCare, Laurens
379 Pinehaven Street Ext.
Laurens, SC  29360-1259

Alabama Centers:

NHC HealthCare, Anniston
2300 Coleman Road
Anniston, AL  36207

NHC HealthCare, Moulton
300 Hospital Street
Moulton, AL  35650

Georgia Center:

NHC HealthCare, Rossville
1425 McFarland Avenue
Rossville, GA  30741

Virginia Center:

NHC HealthCare Bristol
245 North Street
Bristol, VA  24201

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<PAGE>

Retirement Centers:

Colonial Hill Retirement Center
3207 Bristol Hwy.
Johnson City, TN  37601

Lake St. Charles Retirement Center
45 Honey Locust Lane
St. Charles, MO  63303

Parkwood Retirement Apartments
2700 A Parkwood Avenue
Chattanooga, TN  37404
                                       7

<PAGE>

                                  Schedule A-2

<TABLE>
<CAPTION>
National HealthCare Corporation           12/21/05
Allocation of NHI Rent

                                     Allocation of
                                       2007 Rent
-------------------------------      -------------
<S>                                  <C>
Anderson                              3,349,719.74
Anniston                              1,152,192.65
Athens                                  734,407.98
Bristol                                 635,019.65
Chattanooga                           1,215,050.09
Columbia                                172,785.15
Desloge                                 179,760.94
Dickson                               2,645,528.43
Franklin                                321,726.88
Glasgow                               1,180,434.81
Greenwood                               899,691.97
Hendersonville                          807,860.06
Hillview                                519,597.79
Johnson City                            708,580.13
Joplin                                  635,617.43
Kennett                                 367,561.80
Knoxville                               788,343.12
Laurens                               1,545,509.57
Lewisburg                               802,685.74
Madisonville                            402,937.31
Maryland Heights                        251,289.76
McMinnville                           1,134,503.59
Milan                                   881,207.66
Moulton                                 890,546.86
Oakwood                                 461,469.35
Pulaski                                 915,841.10
Rossville                               606,830.82
Scott                                   333,339.08
Sequatchie                              742,468.21
Smithville                              827,233.22
Somerville                              638,087.76
Sparta                                  227,094.55
Springfield                             680,871.68
St. Charles                             100,000.00
Colonial Hill Ret.                      335,208.65
Lake St. Charles                        848,018.77
Parkwood Ret.                             8,977.69
Bayonet Point                         1,325,000.00
Merritt Island                        1,500,000.00
Parkway                               1,300,000.00
Plant City                              627,000.00
                                     -------------
Grand Total                          33,700,000.00
                                     =============
</TABLE>

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