UNITED STATES

SECURITIES AND EXCHANGE COMMISSION



Washington, D.C.  20549

FORM
10-K





(Mark One)

[ X ] ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE 
SECURITIES EXCHANGE ACT OF 1934 
For the fiscal year ended December 31, 2004

OR

[    ] TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
EXCHANGE ACT OF 1934
For the transition period from _____________  to _____________

Commission File Number:    333-109775

J.P. Morgan Acceptance Corporation I

(Exact
Name of Registrant as Specified in its Charter)

|Delaware                                                   | 13-3475488                                
|---------------------------------------------------------- | ------------------------------------------
|(State or Other Jurisdiction
      Of
      Incorporation) | (I.R.S. Employer
      Identification No.)



|270 Park Avenue
      New York, NY(Address of PrincipalExecutive Offices) | 10017
      (Zip Code)
|------------------------------------------------------------------------- | ----------------------



Registrant's telephone number, including area code:     (212) 834-3850



C-BASS Mortgage Loan Asset-Backed Certificates, Series 2004-CB4

(Title of each class of securities covered by this Form)

Securities registered pursuant to Section 12(b) of the Act:   NONE
Securities registered pursuant to Section 12(g) of the Act:   NONE

Indicate by check mark whether the registrant (1) has filed all reports
required to be filed by Section 13 or 15(d) of the Securities Act of 1934
during the preceding 12 months (or for such shorter period that the registrant
was required to file such reports), and (2) has been subject to such filing
requirements for the past 90 days.

[X] Yes            [    ] No

Indicate by check mark if disclosure of delinquent filers pursuant to Item
405 of Regulation S-K is not contained herein, and will not be contained, to
the best of registrant's knowledge, in definitive proxy or information
statements incorporated by reference in Part III of this Form 10-K or any
amendment to this Form 10-K.  [ X ]

Indicate by check mark whether the registrant is an accelerated filer (as
defined in Rule 12b-2 of the Act).

[    ] Yes            [ X ] No





PART I

Item 1.

Business.

Not applicable.

Item 2.

Properties.

Not applicable.

Item 3.

Legal Proceedings.

There were no legal proceedings.

Item 4.

Submission of Matters to a Vote of Security Holders.

There were no matters submitted to a vote of the Security Holders.



PART II

Item 5.

Market for Registrant's Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities.

As of December 31, 2004, the Trust had Eighty-nine (89) holders of record of the Certificates, computed in accordance with Rule 12g5-1 under the Securities Exchange Act of 1934,
as amended.

Item 6.

Selected Financial Data.

Not applicable.

Item 7.

Management's Discussion and Analysis of Financial Condition and
      Results of Operation.

Not applicable.

Item 7A.

Quantitative and Qualitative Disclosures About Market Risk.

Not applicable.

Item 8.

Financial Statements and Supplementary Data.

Not applicable.

Item 9.

Changes in and Disagreements With Accountants on Accounting and Financial Disclosure.

Not applicable.

Item 9A.

Controls and Procedures.

Not applicable.

Item 9B.

Other Information.

Not applicable.



PART III

Item 10.

Directors and Executive Officers of the Registrant.

Not applicable.

Item 11.

Executive Compensation.

Not applicable.

Item 12.

Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters.

Not applicable.

Item 13.

Certain Relationships and Related Transactions.

Not applicable.

Item 14.

Principal Accounting Fees and Services.

Not applicable.



PART IV

Item 15.

Exhibits, Financial Statement Schedules.

(a)

1. Not Applicable

2. Not Applicable

3. Exhibits

31.1 Sarbanes-Oxley Certification

99.1 Annual Statement of Compliance

(a) Litton Loan Servicing, LP

99.2 Report of Independent Accountants

(a) Litton Loan Servicing, LP

99.3 Report of Management

(a) Litton Loan Servicing, LP

(b)

See (a) 3 above

(c)

Not Applicable



SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities
Exchange Act of 1934, the registrant has duly caused this report to be
signed on its behalf by the undersigned, thereunto duly authorized.



C-BASS Mortgage Loan Asset-Backed Certificates,

Series 2004-CB4

Date:

March 29, 2005

By:

/s/ Larry B. Litton

Name:

Larry B. Litton

Title:

President & CEO

Company:

Litton Loan Servicing, LP





EXHIBIT INDEX

31.1 Sarbanes-Oxley Certification

99.1 Annual Statement of Compliance

(a) Litton Loan Servicing, LP

99.2 Report of Independent Accountants

(a) Litton Loan Servicing, LP

99.3 Report of Management

(a) Litton Loan Servicing, LP



---



Exhibit 31.1: Sarbanes-Oxley Certification

Re: C-BASS Mortgage Loan Asset-Backed Certificates, Series 2004-CB4

I, Larry B. Litton, President & CEO of Litton Loan Servicing, LP, certify that:

1. I have reviewed this annual report on Form 10-K, and all reports on Form 8-K
containing distribution or servicing reports filed in respect of periods
included in the year covered by this annual report, of C-BASS Mortgage Loan Asset-Backed Certificates, Series 2004-CB4;

2. Based on my knowledge, the information in these reports, taken as a whole,
does not contain any untrue statement of a material fact or omit to state a
material fact necessary to make the statements made, in light of the
circumstances under which such statements were made, not misleading
as of the last day of the period covered by this annual report;

3. Based on my knowledge, the distribution or servicing information required
to be provided to the trustee by the servicer under the Pooling and Servicing Agreement , for inclusion in these reports is included
in these reports;

4. I am responsible for reviewing the activities performed by the servicer under the Pooling and Servicing Agreement and based upon my knowledge and the annual compliance review required under that agreement, and except as disclosed in the reports, the servicer has fulfilled its obligations under that agreement; and

5. The reports disclose all significant deficiencies relating to the servicer's
compliance with the minimum servicing standards based upon the report
provided by an independent public accountant, after conducting a review
in compliance with the Uniform Single Attestation Program for Mortgage
Bankers or similar procedure, as set forth in the Pooling and Servicing Agreement, that is included in these reports.

In giving the certifications above, I have reasonably relied on information
provided to me by the following unaffiliated parties:

U.S. Bank National Association, as Trustee

Date:

March 29, 2005

Signature:

/s/ Larry B. Litton

Title:

President & CEO

Company:

Litton Loan Servicing, LP

---