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Irwin Barr, MD
NPI 1659450799 · Internal Medicine Physician · Fairfield, CA
Irwin Barr, MD is a Internal Medicine Physician provider in Fairfield, CA (NPI 1659450799).
Provider details
- NPI number
- 1659450799
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- G69947 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
Detailed profile(90/100 index)
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
1550 Gateway Blvd
Fairfield, CA 94533-6901
Phone: (707) 427-4000
Street-level locationGet directions
Mailing address
1800 Harrison St Fl 7
Oakland, CA 94612-3429
Registry dates
- Enumerated
- 2006-11-02
- Last updated
- 2007-07-08
Frequently asked questions
- What is Irwin Barr's NPI number?
- Irwin Barr's National Provider Identifier (NPI) is 1659450799, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Irwin Barr's specialty?
- Irwin Barr is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Irwin Barr located?
- Irwin Barr's practice location on file with NPPES is 1550 Gateway Blvd, Fairfield, CA 94533-6901.
- What is Irwin Barr's phone number?
- The practice phone number listed in the NPPES registry for Irwin Barr is (707) 427-4000.
- Is Irwin Barr's NPI active?
- Yes — Irwin Barr's NPI (1659450799) 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.