Quick answers
- Which hospitals does Mark Clark work at?
- Medicare's official clinician data lists Mark Clark at 1 hospital: Laguna Honda Hospital & Rehabilitation Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Mark Clark see patients?
- Medicare's clinician data lists 2 practice locations, including San Francisco, CA. Call before your visit to confirm the address.
- What is Mark Clark's specialty?
- Medicare lists Internal Medicine as the primary specialty, and also General Surgery.
- Does Mark Clark accept Medicare assignment?
- Yes. Medicare's clinician data says Mark Clark 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.
- What is the phone number for Mark Clark?
- (415) 759-2300, as listed in official Medicare / NPI Registry data.
- What is Mark Clark's NPI number?
- 1891874665. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Mark Clark works
Medicare's Facility Affiliation Data lists Mark Clark at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Laguna Honda Hospital & Rehabilitation CenterSan Francisco, CA · Acute Care Hospital · CCN 050668
Practice locations
Addresses where Mark Clark is enrolled with Medicare (CMS data updated 2026-10-02).
- 375 Laguna Honda BlvdSan Francisco, CA 94116 (415) 759‑2300
- 840 Irving StSan Francisco, CA 94122 (415) 590‑6140
Group practices
Medicare enrollment lists Mark Clark as a member of these groups (CMS data updated 2026-10-02).
- City and County of San Francisco365 clinicians in the group
- One Medical Group Inc331 clinicians in the group
Specialties
- Internal Medicineprimary
- General Surgeryalso
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 | Loyola University Of Chicago, Stritch School Of Medicine |
| Graduation year | 1982 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1891874665 |
| 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
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated 2026-10-02, retrieved 2026-10-29
- 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