John Mendelson MD
NPI 1245418912 · Internal Medicine Physician · San Francisco, CA
John Mendelson MD is a Internal Medicine Physician organization in San Francisco, CA (NPI 1245418912).
Provider details
- NPI number
- 1245418912
- Entity type
- Organization
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Organization subpart
- No
- Authorized official
- John Mendelson, Owner/ Physician(415) 474-7900
- License
- G49959 (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
18 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
- 2008-02-05
- Last updated
- 2008-02-05
Frequently asked questions
- What is John Mendelson MD's NPI number?
- John Mendelson MD's National Provider Identifier (NPI) is 1245418912, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What type of organization is John Mendelson MD?
- John Mendelson MD is classified in the NPPES registry as Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is John Mendelson MD located?
- John Mendelson MD's practice location on file with NPPES is 909 Hyde St, San Francisco, CA 94109-4822.
- What is John Mendelson MD's phone number?
- The practice phone number listed in the NPPES registry for John Mendelson MD is (415) 474-7900.
- Who is the authorized official for John Mendelson MD?
- The authorized official listed on John Mendelson MD's NPPES record is John Mendelson, Owner/ Physician. The authorized official registers and maintains the organization's NPI and is not necessarily its owner.
- Is John Mendelson MD's NPI active?
- Yes — John Mendelson MD's NPI (1245418912) is active in the NPPES registry as of the last update on 2008-02-05.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.