Donald Breyer, M.D.
NPI 1194848150 · Diagnostic Radiology Physician · Oakland, CA
Donald Breyer, M.D. is a Diagnostic Radiology Physician provider in Oakland, CA (NPI 1194848150).
Provider details
- NPI number
- 1194848150
- Entity type
- Individual
- Primary specialty
- Diagnostic Radiology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- G23907 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-04-06
- Last updated
- 2007-07-08
Frequently asked questions
- What is Donald Breyer's NPI number?
- Donald Breyer's National Provider Identifier (NPI) is 1194848150, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Donald Breyer's specialty?
- Donald Breyer is listed in the NPPES registry with a primary specialty of Diagnostic Radiology Physician (Allopathic & Osteopathic Physicians).
- Where is Donald Breyer located?
- Donald Breyer's practice location on file with NPPES is 6861 Gunn Dr, Oakland, CA 94611-1442.
- What is Donald Breyer's phone number?
- The practice phone number listed in the NPPES registry for Donald Breyer is (510) 339-9204.
- Is Donald Breyer's NPI active?
- Yes — Donald Breyer's NPI (1194848150) is active in the NPPES registry as of the last update on 2007-07-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.