Gosta W. Iwasiuk, M.D.
Surgery Physician · Ventura, CA
Gosta W. Iwasiuk, M.D. is a surgery physician with a practice address in Ventura, California, and NPI 1114023249, issued on Sep 16, 2006. Check the license (California A22839, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Gosta W. Iwasiuk
- Credential
- M.D.
- Primary taxonomy
- Surgery Physician 208600000X
- License number
- A22839 CA
Self-reported in NPPES; status is on the state search - Practice location
- 5855 Olivas Park Dr, Ventura, CA 93003
- Phone
- (805) 667-2801
- Enumerated
- Sep 16, 2006
- Record last updated
- Jan 31, 2014 (not updated in 12 years: call before relying on the address or phone)
- Fax
- (805) 667-2865
- Medicaid ID
- 00A228391 CA
- Entity
- Type 1 · individual
8 nearest surgery physician records → All 3,118 in California → Look up another NPI →
Also registered at 5855 Olivas Park Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Arielle Clute, MDFamily Medicine Physician1629530217
- Lukasz Iwanczyk, M.D.Geriatric Medicine (Internal Medicine) Physician1114953262
- Alexander Jehlar, M.D.Hospitalist Physician1033185244
- Roland Ouellette, NPNurse Practitioner1902116239
Verify Gosta W. Iwasiuk in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A22839Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
90% fewer Medicare Part D claims than the average surgery physician in 2024
14 Medicare Part D claims, against an average of 147 among the 20,115 providers of this specialty who prescribed in Part D.
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Gosta W. Iwasiuk among 3,118 surgery physician records in California
Gosta W. Iwasiuk, M.D. is one of 3,118 surgery physician records with a practice address in California. 75% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 6% of them.
- NPI issued2006 · 6% of these records are older, 55% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileNo · 61% of these records are
- Record last updated2014 · 59% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 208600000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Surgery Physician providers in California
There are 3,118 surgery physician records in California.
All 3,118 in California → Every provider in Ventura → Surgery Physician nationwide →
The 8 surgery physician records with the nearest ZIP codes
- Kurt Blickenstaff, M.D.Ventura, CA 930031437212453
- Anthony Carden, MDVentura, CA 930031184943268
- Thomas Duncan, DOVentura, CA 930031316097439
- James Holden, M.D.Ventura, CA 930031720144983
- Garrett Jones, D.O.Ventura, CA 930031861842932
- Karim Jreije, DOVentura, CA 930031518311091
- Javier Romero, M.D.Ventura, CA 930031700940897
- Michael Salehpour, MDVentura, CA 930031699922344
Common questions
What is Gosta W. Iwasiuk, M.D.'s NPI number?
Gosta W. Iwasiuk, M.D.'s National Provider Identifier (NPI) is 1114023249, issued on Sep 16, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Gosta W. Iwasiuk, M.D. located?
The NPPES record lists a practice address at 5855 Olivas Park Dr, Ventura, CA, 93003. Phone: (805) 667-2801. Providers update this record themselves, so call before visiting.
How can I verify Gosta W. Iwasiuk, M.D.'s license?
NPPES lists California license number A22839, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Gosta W. Iwasiuk, M.D. prescribe under Medicare Part D?
In 2024, Gosta W. Iwasiuk, M.D. had 14 Medicare Part D claims; the average among surgery physician prescribers was 147. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.