Gregory T. Antkowiak, MD
Geriatric Medicine (Internal Medicine) Physician · San Diego, CA
Gregory T. Antkowiak, MD is a geriatric medicine (internal medicine) physician with a practice address in San Diego, California, and NPI 1154307775, issued on Dec 15, 2005. Check the license (California A78990, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Gregory T. Antkowiak
- Credential
- MD
- Primary taxonomy
- Geriatric Medicine (Internal Medicine) Physician 207RG0300X
- License number
- A78990 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2810 Camino Del Rio S, San Diego, CA 92108
- Phone
- (619) 299-1419
- Enumerated
- Dec 15, 2005
- Record last updated
- Dec 18, 2014 (not updated in 12 years: call before relying on the address or phone)
- Fax
- (858) 461-6008
- Entity
- Type 1 · individual
8 nearest geriatric medicine (internal medicine) physician records → All 532 in California → Look up another NPI →
Also registered at 2810 Camino Del Rio S
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Steven BohnaCounselor1336093798
- Jason Keri, MDGeriatric Psychiatry Physician1811915812
- Aboo Nasar, M.D.Geriatric Medicine (Internal Medicine) Physician1871533380
- Richard Nguyen, M.D.Geriatric Medicine (Internal Medicine) Physician1275724361
Verify Gregory T. Antkowiak in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A78990Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
100% fewer Medicare Part D claims than the average geriatric medicine (internal medicine) physician in 2024
11 Medicare Part D claims, against an average of 4,246 among the 3,116 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.
Gregory T. Antkowiak among 532 geriatric medicine (internal medicine) physician records in California
Gregory T. Antkowiak, MD is one of 532 geriatric medicine (internal medicine) physician records with a practice address in California. 77% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 93% newer
- In a Medicare fileYes · 77% of these records are
- In the CMS Doctors and Clinicians fileNo · 51% of these records are
- Record last updated2014 · 62% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0300X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Geriatric Medicine (Internal Medicine) Physician providers in California
There are 532 geriatric medicine (internal medicine) physician records in California.
All 532 in California → Every provider in San Diego → Geriatric Medicine (Internal Medicine) Physician nationwide →
The 8 geriatric medicine (internal medicine) physician records with the nearest ZIP codes
- Pouya Afshar, M.D.San Diego, CA 921081184958977
- Cary Bayne, MDSan Diego, CA 921081366463218
- Eric Emont, M.D.San Diego, CA 921081376626754
- Winston Mina, MDSan Diego, CA 921081174582001
- Aboo Nasar, M.D.San Diego, CA 921081871533380
- Richard Nguyen, M.D.San Diego, CA 921081275724361
- Danilo Tan, M.D.San Diego, CA 921081073648200
- Derek Hauser, D.O.San Diego, CA 921101093961757
Common questions
What is Gregory T. Antkowiak, MD's NPI number?
Gregory T. Antkowiak, MD's National Provider Identifier (NPI) is 1154307775, issued on Dec 15, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Gregory T. Antkowiak, MD located?
The NPPES record lists a practice address at 2810 Camino Del Rio S, San Diego, CA, 92108. Phone: (619) 299-1419. Providers update this record themselves, so call before visiting.
How can I verify Gregory T. Antkowiak, MD's license?
NPPES lists California license number A78990, 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 Gregory T. Antkowiak, MD prescribe under Medicare Part D?
In 2024, Gregory T. Antkowiak, MD had 11 Medicare Part D claims; the average among geriatric medicine (internal medicine) physician prescribers was 4,246. 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.