Irena Marie Grauzinis, DO
Family Medicine Physician · Winters, CA
Irena Marie Grauzinis, DO is a family medicine physician with a practice address in Winters, California, and NPI 1487303210, issued on Mar 21, 2022. Check the license (California 20A21650, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Irena Marie Grauzinis
- Credential
- DO
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- 20A21650 CA
Self-reported in NPPES; status is on the state search - Practice location
- 111 Main St Ste B, Winters, CA 95694
- Phone
- (530) 795-4591
- Enumerated
- Mar 21, 2022
- Record last updated
- Oct 10, 2025
- Fax
- (530) 795-0315
- Medicare enrollment
- Enrolled (PECOS I20250904003418); accepts Medicare assignment
- Medical or professional school
- Arizona College Of Osteopathic Medicine Mid Western University, 2022
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
Also registered at 111 Main St Ste B
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Ashley Evans, NPFamily Nurse Practitioner1306494539
- Carly Grovhoug, MDFamily Medicine Physician1003172859
Verify Irena Marie Grauzinis in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 20A21650Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
88% fewer Medicare Part D claims than the average family medicine physician in 2024
423 Medicare Part D claims for 70 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. 31 claims were for opioids.
Most prescribed
- Atorvastatin Calcium29 claims
- Amlodipine Besylate18 claims
- Lisinopril18 claims
- Tizanidine Hcl13 claims
- Gabapentin12 claims
- Oxycodone-Acetaminophen12 claims
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.
Bills Medicare through one group practice
- Sutter Valley Medical FoundationWinters, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
5 family medicine physician records list a practice address in Winters
They are 5 of the 59 NPPES records with a practice address in Winters, and 17,133 family medicine physician records in California.
All 5 in Winters → All 17,133 in California → Every provider in Winters →
Other family medicine physician records in California
- Omer Aba-Omer, MDSanta Monica, CA1649702093
- Michelle Ababa, MDWilmington, CA1710922513
- Anna Tzeitel Abalos, MDRoseville, CA1720200017
- Adan Abarca, MDAnaheim, CA1760553689
- Vanessa Abarca, DOVentura, CA1952040859
- Lorraine Abate, M.D.Sacramento, CA1104840008
- Robert Abatecola, MDCastro Valley, CA1669551719
- Romeo Abaya, M.D.Cottonwood, CA1598053506
- Effiem Abbah, MD, MPHSan Francisco, CA1821185133
- Khuzeman Abbasi, MDSanta Rosa, CA1841979952
Common questions
What is Irena Marie Grauzinis, DO's NPI number?
Irena Marie Grauzinis, DO's National Provider Identifier (NPI) is 1487303210, issued on Mar 21, 2022. An NPI identifies a provider in billing; it is not a license.
Where is Irena Marie Grauzinis, DO located?
The NPPES record lists a practice address at 111 Main St Ste B, Winters, CA, 95694. Phone: (530) 795-4591. Providers update this record themselves, so call before visiting.
How can I verify Irena Marie Grauzinis, DO's license?
NPPES lists California license number 20A21650, 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 Irena Marie Grauzinis, DO prescribe under Medicare Part D?
In 2024, Irena Marie Grauzinis, DO had 423 Medicare Part D claims for 70 beneficiaries; the average among family medicine physician prescribers was 3,544. 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.