Maciej Gerard Ossowski, M. D.
Family Medicine Physician · Merced, CA
Maciej Gerard Ossowski, M. D. is a family medicine physician with a practice address in Merced, California, and NPI 1346207883, issued on Apr 27, 2006. Check the license (California 00A383800, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Maciej Gerard Ossowski
- Credential
- M. D.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- 00A383800 CA
Self-reported in NPPES; status is on the state search - Practice location
- 3349 G St Ste D, Merced, CA 95340
- Phone
- (209) 722-8040
- Enumerated
- Apr 27, 2006
- Record last updated
- Jul 19, 2012 (not updated in 14 years: call before relying on the address or phone)
- Fax
- (209) 722-0287
- Medicare enrollment
- Enrolled (PECOS I20110620000592); may accept Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 17,133 in California → Look up another NPI →
Verify Maciej Gerard Ossowski in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 00A383800Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
5% fewer Medicare Part D claims than the average family medicine physician in 2024
3,355 Medicare Part D claims for 174 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 13% of claims. 366 claims were for opioids.
Most prescribed
- Atorvastatin Calcium211 claims
- Hydrocodone-Acetaminophen179 claims
- Alprazolam116 claims
- Albuterol Sulfate Hfa102 claims
- Ozempic101 claims
- Ezetimibe84 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.
Industry payments in 2024: $89.43
4 payments; by number, the most common kind was food and beverage; the largest payer was Bayer Healthcare Pharmaceuticals Inc. The 55,478 providers of this specialty with any payment received $902.55 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Provident Primary Care IncMerced, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Maciej Gerard Ossowski among 17,133 family medicine physician records in California
Maciej Gerard Ossowski, M. D. is one of 17,133 family medicine physician records with a practice address in California. 81% 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, 59% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated1973 · median 2005 among the 10,652 with a school on file
- Record last updated2012 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
94 family medicine physician records list a practice address in Merced
They are 94 of the 2,836 NPPES records with a practice address in Merced, and 17,133 family medicine physician records in California.
All 17,133 in California → Every provider in Merced → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Vincent Ansley, MDMerced, CA 953401871584185
- David Barabe, M.D.Merced, CA 953401255361770
- Albert Col, M.D.Merced, CA 953401952411266
- Timothy Johnston, M.D.Merced, CA 953401528097847
- Jeanette Kuizon, MDMerced, CA 953401962485243
- Aimee NagtalonMerced, CA 953401487698221
- George Nevatt, MDMerced, CA 953401538194196
- Suchitra Rao, MDMerced, CA 953401710932231
Common questions
What is Maciej Gerard Ossowski, M. D.'s NPI number?
Maciej Gerard Ossowski, M. D.'s National Provider Identifier (NPI) is 1346207883, issued on Apr 27, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Maciej Gerard Ossowski, M. D. located?
The NPPES record lists a practice address at 3349 G St Ste D, Merced, CA, 95340. Phone: (209) 722-8040. Providers update this record themselves, so call before visiting.
How can I verify Maciej Gerard Ossowski, M. D.'s license?
NPPES lists California license number 00A383800, 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 Maciej Gerard Ossowski, M. D. prescribe under Medicare Part D?
In 2024, Maciej Gerard Ossowski, M. D. had 3,355 Medicare Part D claims for 174 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.