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Josef Segal, MD
NPI 1639221856 · Dermatology Physician · Walnut Creek, CA
Josef Segal, MD is a Dermatology Physician provider in Walnut Creek, CA (NPI 1639221856).
Provider details
- NPI number
- 1639221856
- Entity type
- Individual
- Primary specialty
- Dermatology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- G17367 (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
320 Lennon Ln
Walnut Creek, CA 94598-2419
Phone: (925) 906-2000
Street-level locationGet directions
Mailing address
1800 Harrison St Fl 7
Oakland, CA 94612-3429
Registry dates
- Enumerated
- 2007-01-17
- Last updated
- 2007-07-08
Frequently asked questions
- What is Josef Segal's NPI number?
- Josef Segal's National Provider Identifier (NPI) is 1639221856, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Josef Segal's specialty?
- Josef Segal is listed in the NPPES registry with a primary specialty of Dermatology Physician (Allopathic & Osteopathic Physicians).
- Where is Josef Segal located?
- Josef Segal's practice location on file with NPPES is 320 Lennon Ln, Walnut Creek, CA 94598-2419.
- What is Josef Segal's phone number?
- The practice phone number listed in the NPPES registry for Josef Segal is (925) 906-2000.
- Is Josef Segal's NPI active?
- Yes — Josef Segal's NPI (1639221856) 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.