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

SCHEDULE 13G

Under the Securities Exchange Act of 1934

(Amendment No. 3 )*

ICU Medical, Inc.
--------------------------------------------------------------------------------
(Name of Issuer)

Common Stock
--------------------------------------------------------------------------------
(Title of Class of Securities)

44930G107
---------------------------------------------
(CUSIP Number)

February 28, 2005
--------------------------------------------------------------
(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant
to which this Schedule is filed:

[x] Rule 13d-1(b)
[ ] Rule 13d-1(c)
[ ] Rule 13d-1(d)

*The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter the
disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities Exchange Act of
1934 ("Act") or otherwise subject to the liabilities of that section of the Act
but shall be subject to all other provisions of the Act (however, see the
Notes).

13G

CUSIP No.         44930G107
------------------------

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

Columbia Wanger Asset Management, L.P.  04-3519872
------- ------------------------------------------------------------------------
2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*

Not Applicable                                             (a) [ ]

(b) [ ]
------- ------------------------------------------------------------------------
3     SEC USE ONLY

------- ------------------------------------------------------------------------
4     CITIZENSHIP OR PLACE OF ORGANIZATION

Delaware
--------------------- ----- ----------------------------------------------------
5    SOLE VOTING POWER
NUMBER OF
1,669,312
SHARES         ----- ----------------------------------------------------
6    SHARED VOTING POWER                                 
BENEFICIALLY                                                                
0                                               
OWNED BY        ----- ----------------------------------------------------
7    SOLE DISPOSITIVE POWER                              
EACH                                                                    
1,669,312                                       
REPORTING        ----- ----------------------------------------------------
8    SHARED DISPOSITIVE POWER                            
PERSON WITH                                                                 
0                                               
--------------------- ----- ----------------------------------------------------
9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

1,669,312
--------------------------------------------------------------------------------
10   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

Not Applicable                                                  [ ]
--------------------------------------------------------------------------------
11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

12.0%
--------------------------------------------------------------------------------
12   TYPE OF REPORTING PERSON*

IA
--------------------------------------------------------------------------------

13G

CUSIP No.         44930G107
------------------------

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

WAM Acquisition GP, Inc.
------- ------------------------------------------------------------------------
2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*

Not Applicable                                             (a) [ ]

(b) [ ]
------- ------------------------------------------------------------------------
3     SEC USE ONLY

------- ------------------------------------------------------------------------
4     CITIZENSHIP OR PLACE OF ORGANIZATION

Delaware
--------------------- ----- ----------------------------------------------------
5    SOLE VOTING POWER
NUMBER OF
None
SHARES         ----- ----------------------------------------------------
6    SHARED VOTING POWER                                 
BENEFICIALLY                                                                
1,669,312                                       
OWNED BY        ----- ----------------------------------------------------
7    SOLE DISPOSITIVE POWER                              
EACH                                                                    
None                                            
REPORTING        ----- ----------------------------------------------------
8    SHARED DISPOSITIVE POWER                            

PERSON WITH                 1,669,312                                       
--------------------- ----- ----------------------------------------------------
9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

1,669,312
--------------------------------------------------------------------------------
10   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

Not Applicable                                                  [ ]
--------------------------------------------------------------------------------
11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

12.0%
--------------------------------------------------------------------------------
12   TYPE OF REPORTING PERSON*

CO
--------------------------------------------------------------------------------

Item 1(a)          Name of Issuer:

ICU Medical, Inc.

Item 1(b)          Address of Issuer's Principal Executive Offices:

951 Calle Amanecer
San Clemente, California  92673

Item 2(a)          Name of Person Filing:

Columbia Wanger Asset Management, L.P. ("WAM")
WAM Acquisition GP, Inc., the general partner of WAM
("WAM GP")

Item 2(b)          Address of Principal Business Office:

WAM and WAM GP are located at:

227 West Monroe Street, Suite 3000
Chicago, Illinois  60606

Item 2(c)          Citizenship:

WAM is a Delaware limited partnership and WAM GP is a 
Delaware corporation.

Item 2(d)          Title of Class of Securities:

Common Stock

Item 2(e)          CUSIP Number:

44930G107

Item 3             Type of Person:

(e)  WAM is an Investment Adviser registered under 
section 203 of the Investment Advisers Act of 1940; 
WAM GP is the General Partner of the Investment 
Adviser.

Item 4             Ownership (at February 28, 2005):

(a) Amount owned "beneficially" within the meaning 
of rule 13d-3:

(i)  WAM:           1,669,312

(ii) WAM GP:        1,669,312

(b) Percent of class:

(i)  WAM:           12.0%

(ii) WAM GP:        12.0%

(c) Number of shares as to which such person has:

(1) sole power to vote or to direct the vote:

(i)  WAM:           1,669,312

(ii) WAM GP:        0

(2) shared power to vote or to direct the
vote:

(i)  WAM:           0
(ii) WAM GP:        1,669,312

(3) sole power to dispose or to direct the
disposition of:

(i)  WAM:           1,669,312
(ii) WAM GP:        0

(4) shared power to dispose or to direct 
disposition of:

(i)  WAM:           0
(ii) WAM GP:        1,669,312

Item 5             Ownership of Five Percent or Less of a Class:

Not Applicable

Item 6             Ownership of More than Five Percent on Behalf of Another 
Person:

The shares reported herein include the
shares held by Columbia Acorn Trust (CAT), a
Massachusetts business trust that is advised
by WAM, a Delaware limited partnership. CAT
holds 9.0 % shares.

Item 7             Identification and Classification of the Subsidiary Which 
Acquired the Security Being Reported on by the Parent 
Holding Company:

Not Applicable

Item 8             Identification and Classification of Members of the Group:

Not Applicable

Item 9             Notice of Dissolution of Group:

Not Applicable

Item 10            Certification:

By signing below I certify that, to the best of my
knowledge and belief, the securities referred to above were
acquired and are held in the ordinary course of business and
were not acquired and are not held for the purpose of or
with the effect of changing or influencing the control of
the issuer of the securities and were not acquired and are
not held in connection with or as a participant in any
transaction having that purpose or effect.

Disclaimer

In accordance with Rule 13d-4 of the Securities
Exchange Act of 1934, each of the persons filing this
statement expressly disclaim the beneficial ownership of the
securities covered by this statement and the filing of this
report shall not be construed as an admission by such
persons that they are the beneficial owners of such
securities.

Signature

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

Date:  March 9, 2006

The undersigned corporation, on the date above written,
agrees and consents to the joint filing on its behalf of
this Schedule 13G in connection with its beneficial
ownership of the security reported herein.

WAM Acquisition GP, Inc.
for itself and as general partner of
COLUMBIA WANGER ASSET MANAGEMENT, L.P.

By:  /s/Bruce H. Lauer                     
--------------------------------------
Bruce H. Lauer
Senior Vice President and Secretary

Exhibit Index

Exhibit 1       Joint Filing Agreement dated as of March 9, 2006
by and among Columbia Wanger Asset Management, L.P.,
WAM Acquisition GP, Inc. and Columbia Acorn Trust.

EXHIBIT 1

JOINT FILING AGREEMENT

The undersigned hereby agree to the joint filing of the Schedule 13G to
which this Agreement is attached.

Dated:  March 9, 2006

WAM Acquisition GP, Inc.
for itself and as general partner of
COLUMBIA WANGER ASSET MANAGEMENT, L.P.

By:  /s/Bruce H. Lauer                        
-----------------------------------------
Bruce H. Lauer
Senior Vice President and Secretary

COLUMBIA ACORN TRUST

By:  /s/Bruce H. Lauer                        
-----------------------------------------
Bruce H. Lauer
Vice President, Treasurer and
Secretary