Quick answers
- Where does Mark C. Johnson see patients?
- Medicare's clinician data lists 3 practice locations, including San Diego, CA and La Jolla, CA. Call before your visit to confirm the address.
- What is Mark C. Johnson's specialty?
- Medicare lists Physician Assistant as the primary specialty.
- Does Mark C. Johnson accept Medicare assignment?
- Yes. Medicare's clinician data says Mark C. Johnson 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 C. Johnson?
- (858) 249-6753, as listed in official Medicare / NPI Registry data.
- What is Mark C. Johnson's NPI number?
- 1578658746. 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 Mark C. Johnson is enrolled with Medicare (CMS data updated 2026-10-02).
- 200 W Arbor DrSan Diego, CA 92103 (858) 249‑6753
- 9300 Campus Point DrLa Jolla, CA 92037 (858) 249‑6753
- 9350 Campus Point DrLa Jolla, CA 92037 (858) 249‑6753
Group practices
Medicare enrollment lists Mark C. Johnson as a member of this group (CMS data updated 2026-10-02).
- Regents of the University of California2,089 clinicians in the group
Specialties
- Physician Assistantprimary
Other physician assistants in San Diego
Clinicians with the same Medicare primary specialty in San Diego, CA — not a recommendation.
Clinician information
| Credential | PA |
|---|---|
| Graduation year | 1999 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1578658746 |
| 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