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

                                    Form 13F

                              Form 13F COVER PAGE

Report for the Calendar Year or Quarter Ended: March 31, 2013

Check here if Amendment [  ]; Amendment Number:
This Amendment (Check only one.): [  ] is a restatement.
                                  [  ] adds new holdings entries.

Institutional Investment Manager Filing this Report:

Name:    Redmile Group LLC
Address: One Letterman Drive
         Building D, Suite D3-700
         San Francisco, CA  94129

13F File Number:  028-12776

The institutional investment manager filing this report and the person by whom
it is signed hereby represent that the person signing the report is authorized
to submit it, that all information contained herein is true, correct and
complete, and that it is understood that all required items, statements,
schedules, lists, and tables, are considered integral parts of this form.

Person Signing this Report on Behalf of Reporting Manager:

Name:      Jeremy Green
Title:     Managing Member
Phone:     415-489-9980

Signature, Place, and Date of Signing:

 /s/Jeremy Green     San Francisco, CA     May 15, 2013

Report Type (Check only one.):

[ X]         13F HOLDINGS REPORT.

[  ]         13F NOTICE.

[  ]         13F COMBINATION REPORT.



                              FORM 13F SUMMARY PAGE

Report Summary:

Number of Other Included Managers:         0

Form 13F Information Table Entry Total:    50

Form 13F Information Table Value Total:    $544,807 (thousands)

List of Other Included Managers:

Provide a numbered list of the name(s) and Form 13F file number(s) of all
institutional managers with respect to which this report is filed, other
than the manager filing this report.

NONE



                                    
                                                     FORM 13F INFORMATION TABLE
                                                             VALUE  SHARES/ SH/ PUT/ INVSTMT  OTHER            VOTING AUTHORITY
NAME OF ISSUER                 TITLE OF CLASS   CUSIP     (x$1000)  PRN AMT PRN CALL DSCRETN MANAGERS         SOLE   SHARED     NONE
------------------------------ ---------------- --------- -------- -------- --- ---- ------- ------------ -------- -------- --------
ACCURAY INC                    NOTE 3.750% 8/0  004397AB1      443   500000 PRN      SOLE                   500000
ALIGN TECHNOLOGY INC           COM              016255101    27056   807400 SH       SOLE                   807400
AMICUS THERAPEUTICS INC        COM              03152W109     6313  1991490 SH       SOLE                  1991490
ARIAD PHARMACEUTICALS INC      COM              04033A100    14770   816909 SH       SOLE                   816909
ARRAY BIOPHARMA INC            COM              04269X105    23195  4724020 SH       SOLE                  4724020
ARTHROCARE CORP                COM              043136100     4240   121978 SH       SOLE                   121978
ASTRAZENECA PLC                SPONSORED ADR    046353108    12595   252000 SH       SOLE                   252000
BIOSPECIFICS TECHNOLOGIES CO   COM              090931106     5322   312152 SH       SOLE                   312152
BROOKDALE SR LIVING INC        COM              112463104    10447   374700 SH       SOLE                   374700
CAPITAL SR LIVING CORP         COM              140475104     6816   257900 SH       SOLE                   257900
CARDINAL HEALTH INC            COM              14149Y108     2747    66000 SH       SOLE                    66000
CEPHEID                        COM              15670R107     6331   165000 SH       SOLE                   165000
CERUS CORP                     COM              157085101     6746  1526200 SH       SOLE                  1526200
CLOVIS ONCOLOGY INC            COM              189464100    14257   497277 SH       SOLE                   497277
CONCEPTUS INC                  COM              206016107    14045   581572 SH       SOLE                   581572
CYBERONICS INC                 COM              23251P102     7783   166300 SH       SOLE                   166300
CYCLACEL PHARMACEUTICALS INC   COM NEW          23254L306     3228   577465 SH       SOLE                   577465
DYNAVAX TECHNOLOGIES CORP      COM              268158102    10010  4508797 SH       SOLE                  4508797
EXELIXIS INC                   COM              30161Q104      103    22300 SH       SOLE                    22300
EXELIXIS INC                   NOTE 4.250% 8/1  30161QAC8     4935  5000000 PRN      SOLE                  5000000
GILEAD SCIENCES INC            COM              375558103    35557   726540 SH       SOLE                   726540
GIVEN IMAGING                  ORD SHS          M52020100      409    25000 SH       SOLE                    25000
GLOBUS MED INC                 CL A             379577208     8006   545400 SH       SOLE                   545400
GREENWAY MED TECHNOLOGIES IN   COM              39679B103     2541   159815 SH       SOLE                   159815
GRIFOLS S A                    SP ADR REP B NVT 398438408    12350   425700 SH       SOLE                   425700
HCA HOLDINGS INC               COM              40412C101    13290   327100 SH       SOLE                   327100
HEALTH MGMT ASSOC INC NEW      CL A             421933102      156    12120 SH       SOLE                    12120
HEARTWARE INTL INC             COM              422368100    16693   188825 SH       SOLE                   188825
HOLOGIC INC                    COM              436440101      219     9700 SH       SOLE                     9700
IDENIX PHARMACEUTICALS INC     COM              45166R204      107    30200 SH       SOLE                    30200
IMPAX LABORATORIES INC         COM              45256B101    10105   654500 SH       SOLE                   654500
INSULET CORP                   COM              45784P101    17440   674400 SH       SOLE                   674400
ISHARES TR                     DJ HEALTH CARE   464288828      284     3700 SH       SOLE                     3700
ISHARES TR                     RUSSELL 2000     464287655    66101   700000 SH       SOLE                   700000
KYTHERA BIOPHARMACEUTICALS I   COM              501570105     2634   108118 SH       SOLE                   108118
MARKET VECTORS ETF TR          PHARMACEUTICAL   57060U217      293     6500 SH       SOLE                     6500
MOMENTA PHARMACEUTICALS INC    COM              60877T100      179    13400 SH       SOLE                    13400
NEUROCRINE BIOSCIENCES INC     COM              64125C109     9612   790800 SH       SOLE                   790800
NUVASIVE INC                   COM              670704105     3523   165328 SH       SOLE                   165328
ONYX PHARMACEUTICALS INC       COM              683399109    35722   402001 SH       SOLE                   402001
OPTIMER PHARMACEUTICALS INC    COM              68401H104     8985   755000 SH       SOLE                   755000
OREXIGEN THERAPEUTICS INC      COM              686164104     8421  1345240 SH       SOLE                  1345240
PFIZER INC                     COM              717081103    19253   667100 SH       SOLE                   667100
PUMA BIOTECHNOLOGY INC         COM              74587V107    17878   535428 SH       SOLE                   535428
SALIX PHARMACEUTICALS INC      COM              795435106    19146   374100 SH       SOLE                   374100
SIRONA DENTAL SYSTEMS INC      COM              82966C103    13183   178800 SH       SOLE                   178800
TRIUS THERAPEUTICS INC         COM              89685K100     5323   778250 SH       SOLE                   778250
UNITEDHEALTH GROUP INC         COM              91324P102      286     5000 SH       SOLE                     5000
UNIVERSAL HLTH SVCS INC        CL B             913903100    24820   388600 SH       SOLE                   388600
VANGUARD HEALTH SYS INC        COM              922036207    10909   733600 SH       SOLE                   733600