William Owen, M.D.
NPI 1154323483 · Internal Medicine Physician · San Francisco, CA
William Owen, M.D. is a Internal Medicine Physician provider in San Francisco, CA (NPI 1154323483).
Provider details
- NPI number
- 1154323483
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- License
- G31385 (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
21 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
- 2005-05-31
- Last updated
- 2007-07-08
Frequently asked questions
- What is William Owen's NPI number?
- William Owen's National Provider Identifier (NPI) is 1154323483, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Owen's specialty?
- William Owen is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is William Owen located?
- William Owen's practice location on file with NPPES is 45 Castro St, San Francisco, CA 94114-1027.
- What is William Owen's phone number?
- The practice phone number listed in the NPPES registry for William Owen is (415) 861-2400.
- Is William Owen's NPI active?
- Yes — William Owen's NPI (1154323483) 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.