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                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                  SCHEDULE 13D
                                 (RULE 13d-101)


  INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO RULE 13d-1(a) AND
               AMENDMENTS THERETO FILED PURSUANT TO RULE 13d-2(a)

                          ALARIS MEDICAL SYSTEMS, INC.
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                                (Name of Issuer)

                     COMMON STOCK, PAR VALUE $0.01 PER SHARE
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                         (Title of Class of Securities)

                                    011637105
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                                 (CUSIP Number)

                             PAUL S. WILLIAMS, ESQ.
           EXECUTIVE VICE PRESIDENT, CHIEF LEGAL OFFICER AND SECRETARY
                              CARDINAL HEALTH, INC.
                               7000 CARDINAL PLACE
                               DUBLIN, OHIO 43017
                                 (614) 757-5000

                                 with a copy to:

                               DAVID A. KATZ, ESQ.
                         WACHTELL, LIPTON, ROSEN & Katz
                               51 WEST 52ND STREET
                            NEW YORK, NEW YORK 10019
                                 (212) 403-1000
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            (Name, Address and Telephone Number of Person Authorized
                     to Receive Notices and Communications)

                                  MAY 18, 2004
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             (Date of Event Which Requires Filing of This Statement)



If the filing person has previously filed a statement on Schedule 13G to report
the  acquisition  that is the subject of this  Schedule  13D, and is filing this
schedule  because of Rule  13d-1(e),  13d-1(f) or 13d-1(g),  check the following
box: [ ]







                                        SCHEDULE 13D
---------------------------------                      -------------------------

           CUSIP No. 011637105
---------------------------------                      -------------------------



------------------ ------------------------------------------------------------
     1              NAME OF REPORTING PERSON
                    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                    CARDINAL HEALTH, INC.

                    31-0958666
------------------ ------------------------------------------------------------
     2              CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a)  [ ]
                                                                     (b)  [X]

------------------ ------------------------------------------------------------
     3              SEC USE ONLY                                          [ ]
------------------ ------------------------------------------------------------

     4              SOURCE OF FUNDS
                             WC/BK/OO

------------------ ------------------------------------------------------------
     5              CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
                    PURSUANT TO ITEMS 2(d) OR 2(e)                        |_|

------------------ ------------------------------------------------------------
     6              CITIZENSHIP OR PLACE OF ORGANIZATION
                             OHIO
------------------ ------------------------------------------------------------
                      7     SOLE VOTING POWER

                                     -0-

    NUMBER OF
                    ------- ----------------------------------------------------
                      8     SHARED VOTING POWER
      SHARES
                                     -0-

   BENEFICIALLY
                    ------- ----------------------------------------------------
                      9     SOLE DISPOSITIVE POWER
     OWNED BY
                                     -0-

       EACH
                    ------- ----------------------------------------------------
                      10    SHARED DISPOSITIVE POWER
    REPORTING
                                     46,643,209

   PERSON WITH
------------------- -----------------------------------------------------------
        11          AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                                     46,643,209
------------------- ------------------------------------------------------------
        12          CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
                    CERTAIN SHARES
                                                                          [ ]
------------------- ------------------------------------------------------------
        13          PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
                             64.6%
------------------- ------------------------------------------------------------
        14          TYPE OF REPORTING PERSON
                             HC, CO
------------------- ------------------------------------------------------------





ITEM 1:  SECURITY AND ISSUER

         This Statement on Schedule 13D (this "Schedule") relates to the common
stock, par value $0.01 per share ("Common Stock"), of ALARIS Medical Systems,
Inc., a Delaware corporation ("ALARIS"). The principal executive offices of
ALARIS are located at 10221 Wateridge Circle, San Diego, California 92121.

ITEM 2:  IDENTITY AND BACKGROUND

         This Schedule 13D is filed by Cardinal Health, Inc., an Ohio
corporation ("Cardinal Health"). Cardinal Health is the leading provider of
products and services supporting the health care industry. Through a number of
wholly owned subsidiaries, Cardinal Health provides a variety of health care
related products and services. Cardinal Health's principal executive offices are
located at 7000 Cardinal Place, Dublin, Ohio 43017.

         Each executive officer and each director of Cardinal Health is a
citizen of the United States. The name, business address and present principal
occupation of each executive officer and director of Cardinal Health are set
forth in Annex I to this Schedule 13D, which is incorporated herein by this
reference.

         During the last five years, to the best of Cardinal Health's knowledge,
neither Cardinal Health nor any of its executive officers or directors has been
convicted in a criminal proceeding (excluding traffic violations or similar
misdemeanors) or has been a party to a civil proceeding of a judicial or
administrative body of competent jurisdiction as a result of which Cardinal
Health or such person was or is subject to a judgment, decree or final order
enjoining future violations of, or prohibiting or mandating activities subject
to, federal or state securities laws, or finding any violation with respect to
such laws, and which judgment, decree or final order was not subsequently
vacated.

ITEM 3:  SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION

         No payments were made by or on behalf of Cardinal Health in connection
with the execution of the Merger Agreement or the Support Agreement (as such
terms are defined under Item 4 below). A description of the source and amount of
funds required to purchase the Shares in the Offer (as such terms are defined
under Item 4 below) pursuant to the Merger Agreement is contained in Section 12
of the Offer to Purchase dated May 28, 2004 filed as Exhibit (a)(1)(A) to the
Schedule TO filed by Subcorp and Cardinal Health on May 28, 2004, which
description is incorporated herein by reference.

ITEM 4:  PURPOSE OF TRANSACTION

         On May 18, 2004, Cardinal Health, Blue Merger Corp. ("Subcorp"), a
Delaware



corporation and a wholly owned subsidiary of Cardinal Health, and ALARIS entered
into an Agreement and Plan of Merger (the "Merger Agreement"). The Merger
Agreement provides that Subcorp will offer to purchase (the "Offer") all
outstanding shares ("Shares") of Common Stock of ALARIS at a purchase price of
$22.35 per Share, net to the seller in cash, without interest. Following the
consummation of the Offer and the satisfaction or waiver of certain conditions,
ALARIS will merge with and into Subcorp, with ALARIS continuing as the surviving
corporation. A more complete description of the Merger Agreement is contained in
Section 11(b) of the Offer to Purchase dated May 28, 2004 filed as Exhibit
(a)(1)(A) to the Schedule TO filed by Subcorp and Cardinal Health on May 28,
2004, which description is incorporated in this Schedule 13D by reference. A
copy of the Merger Agreement is filed as Exhibit 1 to this Schedule 13D and is
incorporated in this Schedule 13D by reference.

         As a condition and inducement to Cardinal Health and Subcorp's entering
into the Merger Agreement, Jeffry M. Picower ("Mr. Picower") and certain of his
affiliates, Decisions Incorporated, JD Partnership, L.P. and JA Special
Partnership Limited (collectively with Mr. Picower, "ALARIS' Majority
Stockholder"), who, as of May 18, 2004, held the power to dispose of 46,643,209
Shares, immediately following the execution and delivery of the Merger Agreement
entered into a Support/Tender Agreement (the "Support Agreement"), dated May 18,
2004, with Cardinal Health. Under the Support Agreement, ALARIS' Majority
Stockholder agreed, among other things, to tender the Shares then held by him in
the Offer. A more complete description of the Support Agreement is contained in
Section 11(c) of the Offer to Purchase dated May 28, 2004 filed as Exhibit
(a)(1)(A) to the Schedule TO filed by Subcorp and Cardinal Health on May 28,
2004, which description is incorporated herein by reference. A copy of the
Support Agreement is filed as Exhibit 2 to this Schedule 13D and is incorporated
in this Schedule 13D by this reference.

         The purpose of the transactions described above is for Cardinal Health
to acquire control of ALARIS. Upon consummation of the Merger, ALARIS will
become a subsidiary of Cardinal Health, the shares of ALARIS Common Stock will
cease to be freely traded or listed, ALARIS Common Stock will be de-registered
under the Securities Act of 1933, as amended, and Cardinal Health will control
the board of directors of ALARIS and will make such other changes in the
charter, bylaws, capitalization, management and business of ALARIS as set forth
in the Merger Agreement and/or as may be appropriate in its judgment.

         Except as set forth or incorporated by reference in this Schedule,
Cardinal Health does not have any current plans or proposals that relate to or
would result in (i) the acquisition by any person of additional shares of ALARIS
Common Stock or the disposition of shares of ALARIS Common Stock; (ii) an
extraordinary corporate transaction, such as a merger, reorganization or
liquidation, involving ALARIS or any of its subsidiaries; (iii) a sale or
transfer of any material amount of assets of ALARIS or any of its subsidiaries;
(iv) any change in the present board of directors or management of ALARIS,
including any plans or proposals to change the number or term of directors or to
fill any vacancies on the board; (v) any material change in the present
capitalization or dividend policy of ALARIS; (vi) any other material change in
ALARIS' business or corporate structure; (vii) any change in ALARIS' Certificate
of Incorporation or Bylaws, or instruments corresponding thereto, or other
actions that may impede the acquisition of control of ALARIS by any person;
(viii) causing a class of securities of ALARIS to be delisted from a national
securities exchange or to cease to be authorized to be quoted in an inter-



dealer quotation system of a registered national securities association; (ix) a
class of equity securities of ALARIS becoming eligible for termination of
registration pursuant to Section 12(g)(4) of the Securities Exchange Act of
1934, as amended; or (x) any action similar to any of those enumerated above.

ITEM 5:  INTEREST IN SECURITIES OF THE ISSUER

         As a result of entering into the Support Agreement, Cardinal Health may
be deemed to have shared dispositive power with respect to an aggregate of
46,643,209 Shares owned by ALARIS' Majority Stockholder, which constitutes,
based on information provided by ALARIS and set forth in the Merger Agreement
and/or the Support Agreement, approximately 64.6% of the issued and outstanding
Shares. Cardinal Health disclaims beneficial ownership with respect to such
Shares.

         A copy of the Merger Agreement is filed as Exhibit 1 to this Schedule
13D and is incorporated by reference, and a copy of the Support Agreement is
filed as Exhibit 2 to this Schedule 13D and is incorporated by reference.
Reference to or description of the Merger Agreement or the Support Agreement, as
the case may be, is qualified in its entirety by reference to such exhibit.

         To the best of Cardinal Health's knowledge, as of the date hereof, no
executive officer or director of Cardinal Health beneficially owns any shares of
ALARIS common stock, nor (except for the Support Agreement) have any
transactions in ALARIS common stock been effected during the past sixty days by
Cardinal Health or, to the best knowledge of Cardinal Health, by any executive
officer or director of Cardinal Health. In addition, no other person is known by
Cardinal Health to have the right to receive or the power to direct the receipt
of dividends from, or the proceeds from the sale of, the securities covered by
this Schedule 13D.

ITEM 6:  CONTRACTS, ARRANGEMENTS, UNDERSTANDINGS OR RELATIONSHIPS WITH RESPECT
         TO SECURITIES OF THE ISSUER

         The information set forth, or incorporated by reference, in Items 3, 4
and 5 is incorporated by reference to this Item 6. Except as described in this
Schedule, Cardinal Health presently has no contracts, arrangements,
understandings or relationships with any other person with respect to any
securities of ALARIS, including but not limited to the transfer or voting of any
shares of Common Stock, finder's fees, joint ventures, loans or option
arrangements, puts or calls, guarantees of profits, division of profits or loss
or the giving or withholding of proxies.

ITEM 7:  MATERIAL TO BE FILED AS EXHIBITS

         The following exhibits are filed as part of this Schedule 13D:

Exhibit 1             --    Agreement and Plan of Merger, dated as of May 18,
                            2004, by and among Cardinal Health, Inc., Blue
                            Merger Corp. and ALARIS Medical Systems, Inc.
                            (incorporated in this Schedule 13D by reference to
                            Exhibit (d)(1) of the Schedule TO filed by Cardinal
                            Health on May 28, 2004).



Exhibit 2             --    Support/Tender  Agreement,  dated as of May 18,
                            2004, among Cardinal Health and Decisions
                            Incorporated, JD Partnership,  L.P., JA Special
                            Partnership Limited and Jeffry M. Picower
                            (incorporated  in this  Schedule 13D by  reference
                            to Exhibit  (d)(1) of the Schedule TO filed by
                            Cardinal Health on May 28, 2004).





                                    SIGNATURE


          After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this Schedule is true, complete and
correct.


Dated as of:  May 28, 2004


                              CARDINAL HEALTH, INC.


                               By:           /s/ Paul S. Williams
                                    -------------------------------------------
                                     Name:       Paul S. Williams
                                     Title:      Executive Vice President, Chief
                                                 Legal Officer and Secretary














                                     ANNEX I

            DIRECTORS AND EXECUTIVE OFFICERS OF CARDINAL HEALTH, INC.

          Set forth below are the name and present principal occupation of each
director and executive officer of Cardinal Health, Inc. as of May 23, 2004. The
business address of each such director and executive officer is c/o Cardinal
Health, Inc., 7000 Cardinal Place, Dublin, Ohio 43017.

1.       DIRECTORS OF CARDINAL HEALTH

NAME                         PRINCIPAL OCCUPATION
----                         --------------------

Dave Bing                    Chairman and Chief Executive Officer of The Bing
                             Group, L.L.C., an automotive and industrial parts
                             supplier and service provider

George H. Conrades           Chairman and Chief Executive Officer of Akamai
                             Technologies, Inc., a provider of global internet
                             services

John F. Finn                 Chairman and Chief Executive Officer of Gardner,
                             Inc., an outdoor power equipment distributor

Robert L. Gerbig             Retired Chairman and Chief Executive Officer of
                             Gerbig, Snell/Weisheimer & Associates, Inc., an
                             advertising agency

John F. Havens               Director Emeritus and retired Chairman of Bank One
                             Corporation, a bank holding company

J. Michael Losh              Retired Chairman of Metaldyne Corporation, a
                             manufacturer of components primarily for the
                             automotive industry

John B. McCoy                Retired Chairman of the Board of Corillian
                             Corporation, a provider of internet-related
                             financial services

Richard C. Notebaert         Chairman and Chief Executive Officer of Qwest
                             Communications International Inc., a
                             telecommunications systems company

Michael D. O'Halleran        President and Chief Operating Officer of Aon
                             Corporation, an insurance brokerage, consulting and
                             underwriting company

David W. Raisbeck            Vice Chairman of Cargill, Incorporated, an
                             international marketer, processor and distributor
                             of agricultural, food, financial and industrial
                             products and services




Jean G. Spaulding,           Consultant to Duke University Health System, a
M.D.                         non-profit academic health care system; Trustee of
                             The Duke Endowment; Private practice in psychiatry
                             for children, adolescents and adults; Associate
                             Clinical Professorships with both the Department
                             of Psychiatry and the Department of Community &
                             Family Medicine at Duke University Medical Center

Matthew D. Walter            Chief Executive Officer, Bound Tree Medical, LLC,
                             a provider of medical equipment and supplies to
                             the emergency medical market

Robert D. Walter             Chairman and Chief Executive Officer of Cardinal
                             Health.

2.       EXECUTIVE OFFICERS OF CARDINAL HEALTH

The following is a list of the executive officers of Cardinal Health:

NAME                         PRINCIPAL OCCUPATION
----                         --------------------

Robert D. Walter             Chairman and Chief Executive Officer of Cardinal
                             Health

George L. Fotiades           President and Chief Operating Officer of Cardinal
                             Health

Ronald K. Labrum             President and Chief Executive Officer--Integrated
                             Provider Solutions of Cardinal Health

Mark W. Parrish              Executive Vice President and Group President--
                             Pharmaceutical Distribution of Cardinal Health

Brendan A. Ford              Executive Vice President--Corporate Development of
                             Cardinal Health

Richard J. Miller            Executive Vice President and Chief Financial
                             Officer of Cardinal Health

Anthony J. Rucci             Executive Vice President and Chief Administrative
                             Officer of Cardinal Health

Jody R. Davids               Executive Vice President and Chief Information
                             Officer of Cardinal Health

Gary D. Dolch                Executive Vice President, Quality and Regulatory
                             Affairs of Cardinal Health

Carole S. Watkins            Executive Vice President--Human Resources of
                             Cardinal Health

Paul S. Williams             Executive Vice President, Chief Legal Officer and
                             Secretary of Cardinal Health