Form 10-K/A

               UNITED STATES SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C. 20549

[X]  Annual Report Pursuant to Section 13 or 15(d) of the Securities Exchange
     Act of 1934
     For the fiscal year ended March 31, 1999

[ ]  Transition Report Pursuant to Section 13 or 15(d) of the Securities
     Exchange Act of 1934



                        Commission File Number 1-13252

                              McKESSON HBOC, INC.
                            A Delaware Corporation

                     I.R.S. Employer Identification Number
                                  94-3207296

                                McKesson Plaza
                                One Post Street
                        San Francisco, California 94104

                     Telephone - Area Code (415) 983-8300

     McKesson HBOC, Inc. hereby amends the following exhibits of its Annual
Report for the fiscal year ended March 31, 1999 on Form 10-K as set forth in the
pages attached hereto:

(1)  Exhibit 99.4  Annual Report on Form 11-K for the McKesson HBOC, Inc. Profit
     Sharing Investment Plan for the plan year ended March 31, 1999.

Pursuant to the requirements of the Securities Exchange Act of 1934, the
registrant has duly caused this amendment to be signed on its behalf by the
undersigned, thereunto duly authorized on the 12th day of October, 1999.

                                      McKESSON HBOC, INC.


                                      By /s/ Ivan D. Meyerson
                                         ---------------------
                                         Ivan D. Meyerson
                                         Senior Vice President, General Counsel
                                         and Secretary




October 12, 1999



                                 EXHIBIT INDEX



 Exhibit
 Number                                Description
 -------                               -----------
      
  2.1    Agreement and Plan of Merger, dated as of October 17, 1998, by and
         among McKesson Corporation ("McKesson"), McKesson Merger Sub, Inc.
         ("Merger Sub") and HBO & Company ("HBOC") (Exhibit 2.1 (1)).

  2.2    Amendment Agreement to Agreement and Plan of Merger, dated as of
         November 9, 1998, by and among McKesson, Merger Sub and HBOC (Exhibit
         2.2 (1)).

  2.3    Second Amendment Agreement to that certain Agreement and Plan of
         Merger dated October 17, 1998, as amended by an Amendment Agreement
         dated as of November 9, 1998 (Exhibit 2.1 (2)).

  3.1    Restated Certificate of Incorporation of the Company as filed with the
         office of the Delaware Secretary of State on July 30, 1998 (Exhibit
         3.2 (3)).

  3.2    Certificate of Amendment to the Restated Certificate of Incorporation
         of Registrant as filed with the office of the Delaware Secretary of
         State on January 12, 1999 (Exhibit 4.3 (4)).

  3.3    Restated By-Laws of the Company, as amended through April 26, 1999.

  3.4    Amendment to Restated By-Laws of the Company dated April 26, 1999.
  4.1    Rights Agreement dated as of October 21, 1994 between McKesson and
         First Chicago Trust Company of New York, as Rights Agent (the "Rights
         Agreement") (Exhibit 4.1 (5)).

  4.2    Amendment No. 1 to the Rights Agreement dated October 19, 1998
         (Exhibit 99.1 (6)).

  4.3    Indenture, dated as of March 11, 1997, by and between McKesson, as
         Issuer, and The First National Bank of Chicago, as Trustee (Exhibit
         4.4 (7)).

  4.4    Amended and Restated Declaration of Trust of McKesson Financing Trust,
         dated as of February 20, 1997, among McKesson, as Sponsor, The First
         National Bank of Chicago, as Institutional Trustee, First Chicago
         Delaware, Inc., as Delaware Trustee and William A. Armstrong, Ivan D.
         Meyerson and Nancy A. Miller, as Regular Trustees (Exhibit 4.2 (8)).

  4.5    McKesson Corporation Preferred Securities Guarantee Agreement, dated
         as of February 20, 1997, between McKesson, as Guarantor, and The First
         National Bank of Chicago, as Preferred Guarantor (Exhibit 4.7 (9)).

  4.6    Registrant agrees to furnish to the Commission upon request a copy of
         each instrument defining the rights of security holders with respect
         to issues of long-term debt of the Registrant, the authorized
         principal amount of which does not exceed 10% of the total assets of
         the Registrant.

 10.1*   Form of Employment Agreement, dated as of March 31, 1999, by and
         between the Company and certain designated Executive Officers.

 10.2*   Employment Agreement, dated as of March 31, 1999, by and between the
         Company and a former Executive Vice President who was also the
         President and Chief Executive Officer of the Company's Information
         Technology Business.

 10.3*   Amended and Restated Employment Agreement, dated March 26, 1999, by
         and between the Company and its former President and Chief Executive
         Officer.

 10.4*   Form of Termination Agreement by and between the Company and certain
         designated Corporate Officers (Exhibit 10.23 (10)).

 10.5*   McKesson HBOC, Inc. 1994 Stock Option and Restricted Stock Plan (as
         amended through January 27, 1999).

 10.6*   McKesson HBOC, Inc. 1997 Non-Employee Directors' Equity Compensation
         and Deferral Plan, as amended through January 27, 1999.




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 Exhibit
 Number                                Description
 -------                               -----------
      
 10.7*   McKesson HBOC, Inc. Supplemental PSIP.

 10.8*   McKesson HBOC, Inc. Deferred Compensation Administration Plan amended
         as of January 27, 1999.

 10.9*   McKesson HBOC, Inc. Deferred Compensation Administration Plan II, as
         amended effective January 27, 1999.

 10.10*  McKesson HBOC, Inc. 1994 Option Gain Deferral Plan, as amended
         effective January 27, 1999.

 10.11*  McKesson HBOC, Inc. Directors' Deferred Compensation Plan, as amended
         effective January 27, 1999.

 10.12*  McKesson HBOC, Inc. 1985 Executives' Elective Deferred Compensation
         Plan, amended as of January 27, 1999.

 10.13*  McKesson HBOC, Inc. Management Deferred Compensation Plan, amended as
         of January 27, 1999.

 10.14*  McKesson HBOC, Inc. 1984 Executive Benefit Retirement Plan, as amended
         through January 27, 1999.

 10.15*  McKesson HBOC, Inc. 1988 Executive Survivor Benefits Plan, as amended
         effective January 27, 1999.

 10.16*  McKesson HBOC, Inc. Executive Medical Plan Summary.

 10.17*  McKesson HBOC, Inc. Severance Policy for Executive Employees (as
         amended through January 27, 1999).

 10.18*  McKesson HBOC, Inc. 1989 Management Incentive Plan, as amended through
         January 27, 1999.

 10.19*  McKesson HBOC, Inc. Long-Term Incentive Plan, as amended through
         January 27, 1999.

 10.20*  McKesson HBOC, Inc. Stock Purchase Plan, as amended through January
         27, 1999.

 10.21*  McKesson HBOC, Inc. 1999 Executive Stock Purchase Plan (Exhibit 99.1
         (11)).

 10.22*  Form of Consulting Agreement, dated as of March 28, 1997, by and
         between McKesson and its former Chairman and retired Chief Executive
         Officer (Exhibit 10.32 (7)).

 10.23*  Amendment No. 1 to Consulting Agreement, entered into as of March 25,
         1998, by and between McKesson and its Chairman and retired Chief
         Executive Officer (Exhibit 10.1(3)).

 10.24*  HBO & Company 1990 Executive Incentive Plan (Exhibit 4 (12) and
         Exhibit 4(a) (12)).

 10.25*  HBO & Company 1993 Stock Option Plan for Nonemployee Directors
         (Exhibit 4 (13)).

 10.26*  HBO & Company Omnibus Stock Incentive Plan (Exhibit 4 (14)).

 10.27*  McKesson HBOC, Inc. 1998 Employee Stock Purchase Plan (as amended and
         restated effective January 12, 1999 (Exhibit 99.25 (4)).

 10.28*  Statement of Terms and Conditions Applicable to Certain Stock Options
         Granted on January 27, 1999.

 10.29   Credit Agreement dated as of November 10, 1998 among McKesson, Medis
         Health and Pharmaceutical Services Inc., an Ontario corporation and
         indirect wholly owned subsidiary of McKesson, Bank of America National
         Trust and Savings Association, as Agent, Bank of America Canada, as
         Canadian Administrative Agent, The Chase Manhattan Bank, as
         documentation agent, First Union National Bank, as documentation
         agent, The First National Bank of Chicago, as documentation agent, and
         the other financial institutions party thereto.

 10.30   Stock Option Agreement, dated October 17, 1998, between McKesson and
         HBOC (Exhibit 99.1 (1)).

 10.31   Stock Option Agreement, dated October 17, 1998, between HBOC and
         McKesson (Exhibit 99.2 (1)).






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 Exhibit
 Number                                Description
 -------                               -----------

      
 21      List of Subsidiaries of the Company.

 23.1    Consent of Deloitte & Touche LLP.

 23.2    Consent of Arthur Andersen LLP.

 24      Power of Attorney.

 27.1    Financial Data Schedule.

 27.2    Financial Data Schedule.

 27.3    Financial Data Schedule.

 99.1    Registration Rights Agreement dated as of June 22, 1998 by McKesson
         and the other undersigned parties thereto (Exhibit 10.1(15)).

 99.2    Registration Rights Agreement dated as of August 27, 1998, by McKesson
         and the other undersigned parties thereto.

 99.3    Annual Report on Form 11-K for HBO & Company Profit-Sharing and
         Savings Plan.

 99.4    Annual Report on Form 11-K for the McKesson HBOC, Inc. Profit Sharing
         Investment Plan for the plan year ended March 31, 1999.


                                         Exhibit 99.4
                                         Form 10-K for 1999
                                         File No. 1-13252

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Footnotes to Exhibit Index:

  * Denotes management contract or compensatory plan, contract or arrangement.
 (1) Incorporated by reference to designated exhibit to Amendment No. 1 to
     McKesson's Form S-4 Registration Statement No. 333-67299 filed on
     November 27, 1998.
 (2) Incorporated by reference to designated exhibit to the Company's Current
     Report on Form 8-K dated January 14, 1999.
 (3) Incorporated by reference to designated exhibit to McKesson's Quarterly
     Report on Form 10-Q for the quarter ended June 30, 1998.
 (4) Incorporated by reference to designated exhibit to the Company's Form S-8
     Registration Statement No. 333-70501 filed on January 12, 1999.
 (5) Incorporated by reference to designated exhibit to Amendment No. 3 to
     McKesson's Registration Statement on Form 10 filed on October 27, 1994.
 (6) Incorporated by reference to designated exhibit to McKesson's Quarterly
     Report on Form 10-Q for the quarter ended September 30, 1998.
 (7) Incorporated by reference to designated exhibit to McKesson's Annual
     Report on Form 10-K for the fiscal year ended March 31, 1997.
 (8) Incorporated by reference to designated exhibit to Amendment No. 1 to
     McKesson's Form S-3 Registration Statement No. 333-26433 filed on June
     18, 1997.
 (9) Incorporated by reference to designated exhibit to McKesson's Form S-3
     Registration Statement No. 333-26433 filed on May 2, 1997.
(10) Incorporated by reference to designate exhibit to McKesson's Annual
     Report on Form 10-K for the fiscal year ended March 31, 1995.
(11) Incorporated by reference to designated exhibit to the Company's Form S-8
     Registration Statement No. 333-71917 filed on February 5, 1999.
(12) Incorporated by reference to designated exhibits to HBOC's Form S-8
     Registration Statement No. 33-82962 filed on August 1, 1994 and its Form
     S-8 Registration Statement No. 333-05759 filed on June 12, 1996.
(13) Incorporated by reference to designated exhibit to HBOC's Form S-8
     Registration Statement No. 33-67300 filed on August 12, 1993.
(14) Incorporated by reference to designated exhibit to HBOC's Form S-8
     Registration Statement No. 333-26885 filed on May 12, 1997.
(15) Incorporated by reference to designated exhibit to McKesson's Form S-3
     Registration Statement No. 333-66359 filed on October 30, 1998.


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