Brian Lewis, MD
NPI 1467530089 · Hematology & Oncology Physician · San Anselmo, CA
Brian Lewis, MD is a Hematology & Oncology Physician provider in San Anselmo, CA (NPI 1467530089).
Provider details
- NPI number
- 1467530089
- Entity type
- Individual
- Primary specialty
- Hematology & Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- G26437 (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
- 2006-11-01
- Last updated
- 2007-08-07
Frequently asked questions
- What is Brian Lewis's NPI number?
- Brian Lewis's National Provider Identifier (NPI) is 1467530089, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Brian Lewis's specialty?
- Brian Lewis is listed in the NPPES registry with a primary specialty of Hematology & Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Brian Lewis located?
- Brian Lewis's practice location on file with NPPES is 50 Mather Rd, San Anselmo, CA 94960-1047.
- What is Brian Lewis's phone number?
- The practice phone number listed in the NPPES registry for Brian Lewis is (415) 454-2676.
- Is Brian Lewis's NPI active?
- Yes — Brian Lewis's NPI (1467530089) is active in the NPPES registry as of the last update on 2007-08-07.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.