Irwin Fisch, MD
NPI 1629259486 · Internal Medicine Physician · Walnor Creek, CA
Irwin Fisch, MD is a Internal Medicine Physician provider in Walnor Creek, CA (NPI 1629259486).
Provider details
- NPI number
- 1629259486
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- C21622 (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
18 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
- 2007-11-21
- Last updated
- 2026-04-26
Frequently asked questions
- What is Irwin Fisch's NPI number?
- Irwin Fisch's National Provider Identifier (NPI) is 1629259486, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Irwin Fisch's specialty?
- Irwin Fisch is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Irwin Fisch located?
- Irwin Fisch's practice location on file with NPPES is 1425 South Main St, Walnor Creek, CA 94596.
- What is Irwin Fisch's phone number?
- The practice phone number listed in the NPPES registry for Irwin Fisch is (925) 229-7800.
- Is Irwin Fisch's NPI active?
- Yes — Irwin Fisch's NPI (1629259486) is active in the NPPES registry as of the last update on 2026-04-26.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.