Donald A. Breyer, M.D.
Diagnostic Radiology Physician · Oakland, CA
Donald A. Breyer, M.D. is a diagnostic radiology physician with a practice address in Oakland, California, and NPI 1194848150, issued on Apr 6, 2007. Check the license (California G23907, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Donald A. Breyer
- Credential
- M.D.
- Primary taxonomy
- Diagnostic Radiology Physician 2085R0202X
- License number
- G23907 CA
Self-reported in NPPES; status is on the state search - Practice location
- 6861 Gunn Dr, Oakland, CA 94611
- Phone
- (510) 339-9204
- Enumerated
- Apr 6, 2007
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (510) 338-0069
- Entity
- Type 1 · individual
8 nearest diagnostic radiology physician records → All 4,500 in California → Look up another NPI →
Verify Donald A. Breyer in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G23907Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
57% fewer Medicare Part D claims than the average diagnostic radiology physician in 2024
22 Medicare Part D claims, against an average of 51 among the 2,711 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.
Donald A. Breyer among 4,500 diagnostic radiology physician records in California
Donald A. Breyer, M.D. is one of 4,500 diagnostic radiology physician records with a practice address in California. 74% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 48% of them.
- NPI issued2007 · 48% of these records are older, 41% newer
- In a Medicare fileYes · 74% of these records are
- In the CMS Doctors and Clinicians fileNo · 70% of these records are
- Record last updated2007 · 60% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2085R0202X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Diagnostic Radiology Physician providers in California
There are 4,500 diagnostic radiology physician records in California.
All 4,500 in California → Every provider in Oakland → Diagnostic Radiology Physician nationwide →
The 8 diagnostic radiology physician records with the nearest ZIP codes
- Irene Balcar, MDOakland, CA 946111811075690
- Samuel Baronofsky, MDOakland, CA 946111548348329
- Nora Canty, MDOakland, CA 946111033297809
- Marianna Caponigro, MDOakland, CA 946111255419040
- Maria Dais, MDOakland, CA 946111164441986
- Grace Fan, MDOakland, CA 946111982782769
- Derek Kubota, MDOakland, CA 946111265510051
- David Lim, MDOakland, CA 946111083792865
Common questions
What is Donald A. Breyer, M.D.'s NPI number?
Donald A. Breyer, M.D.'s National Provider Identifier (NPI) is 1194848150, issued on Apr 6, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Donald A. Breyer, M.D. located?
The NPPES record lists a practice address at 6861 Gunn Dr, Oakland, CA, 94611. Phone: (510) 339-9204. Providers update this record themselves, so call before visiting.
How can I verify Donald A. Breyer, M.D.'s license?
NPPES lists California license number G23907, 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 Donald A. Breyer, M.D. prescribe under Medicare Part D?
In 2024, Donald A. Breyer, M.D. had 22 Medicare Part D claims; the average among diagnostic radiology physician prescribers was 51. 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.