Michael Drennan, MD
NPI 1811029846 · Family Medicine Physician · San Francisco, CA
Michael Drennan, MD is a Family Medicine Physician provider in San Francisco, CA (NPI 1811029846).
Provider details
- NPI number
- 1811029846
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- A32493 (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
- 2007-03-13
- Last updated
- 2007-07-08
Frequently asked questions
- What is Michael Drennan's NPI number?
- Michael Drennan's National Provider Identifier (NPI) is 1811029846, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Michael Drennan's specialty?
- Michael Drennan is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Michael Drennan located?
- Michael Drennan's practice location on file with NPPES is 1050 Wisconsin St, San Francisco, CA 94107-3328.
- What is Michael Drennan's phone number?
- The practice phone number listed in the NPPES registry for Michael Drennan is (415) 920-1213.
- Is Michael Drennan's NPI active?
- Yes — Michael Drennan's NPI (1811029846) 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.