What is David Warren's NPI number?

David Warren's National Provider Identifier (NPI) is 1811906852, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.

What is David Warren's specialty?

David Warren is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).

Where is David Warren located?

David Warren's practice location on file with NPPES is 558 Clayton Street, San Francisco, CA 94117.

What is David Warren's phone number?

The practice phone number listed in the NPPES registry for David Warren is (415) 487-5638.

Is David Warren's NPI active?

Yes — David Warren's NPI (1811906852) is active in the NPPES registry as of the last update on 2007-07-08.

IndividualActive

David Warren, M.D.

NPI 1811906852 · Internal Medicine Physician · San Francisco, CA

David Warren, M.D. is a Internal Medicine Physician provider in San Francisco, CA (NPI 1811906852).

Provider details

NPI number: 1811906852
Entity type: Individual
Primary specialty: Internal Medicine PhysicianAllopathic & Osteopathic Physicians
Credential: M.D.
Sex: Male
Sole proprietor: Yes
License: C51934 (CA)

Specialties & taxonomies

Internal Medicine PhysicianPrimary207R00000XLicense C51934 (CA)
Allopathic & Osteopathic Physicians

Profile Score

Detailed profile(91/100 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

558 Clayton Street

Haight Ashbury Free Medical Clinic

San Francisco, CA 94117

Phone: (415) 487-5638

Fax: (415) 431-9909

Street-level locationGet directions

More CA providers

Mailing address

248 Exeter Ave

San Carlos, CA 94070-1611

Enumerated: 2006-08-07
Last updated: 2007-07-08

Frequently asked questions

What is David Warren's NPI number?: David Warren's National Provider Identifier (NPI) is 1811906852, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
What is David Warren's specialty?: David Warren is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
Where is David Warren located?: David Warren's practice location on file with NPPES is 558 Clayton Street, San Francisco, CA 94117.
What is David Warren's phone number?: The practice phone number listed in the NPPES registry for David Warren is (415) 487-5638.
Is David Warren's NPI active?: Yes — David Warren's NPI (1811906852) 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.