Quick answers
- Where does John E. Mendelson see patients?
- Medicare's clinician data lists 1 practice location in San Francisco, CA. Call before your visit to confirm the address.
- What is John E. Mendelson's specialty?
- Medicare lists Internal Medicine as the primary specialty, and also Addiction Medicine.
- Does John E. Mendelson accept Medicare assignment?
- Yes. Medicare's clinician data says John E. Mendelson accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- Does John E. Mendelson offer telehealth?
- Medicare's clinician data says John E. Mendelson offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for John E. Mendelson?
- (800) 504-5360, as listed in official Medicare / NPI Registry data.
- What is John E. Mendelson's NPI number?
- 1891889341. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Practice locations
Addresses where John E. Mendelson is enrolled with Medicare (CMS data updated 2026-10-02).
- 88 King St, Unit 403San Francisco, CA 94107 (800) 504‑5360
Group practices
Medicare enrollment lists John E. Mendelson as a member of this group (CMS data updated 2026-10-02).
- Ria Health PC15 clinicians in the group
Specialties
- Internal Medicineprimary
- Addiction Medicinealso
Other internal medicine doctors in San Francisco
Clinicians with the same Medicare primary specialty in San Francisco, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of California, San Francisco School Of Medicine |
| Graduation year | 1982 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1891889341 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians