Quick answers
- Which hospitals does John A. Ritzo work at?
- Medicare's official clinician data lists John A. Ritzo at 1 hospital: Peninsula Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does John A. Ritzo see patients?
- Medicare's clinician data lists 1 practice location in San Mateo, CA. Call before your visit to confirm the address.
- What is John A. Ritzo's specialty?
- Medicare lists Family Practice as the primary specialty.
- Does John A. Ritzo accept Medicare assignment?
- Yes. Medicare's clinician data says John A. Ritzo 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 A. Ritzo offer telehealth?
- Medicare's clinician data says John A. Ritzo offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for John A. Ritzo?
- (650) 343-4003, as listed in official Medicare / NPI Registry data.
- What is John A. Ritzo's NPI number?
- 1326780115. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where John A. Ritzo works
Medicare's Facility Affiliation Data lists John A. Ritzo at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Peninsula Medical CenterBurlingame, CA · Acute Care Hospital · CCN 050007
Practice locations
Addresses where John A. Ritzo is enrolled with Medicare (CMS data updated 2026-10-02).
- 101 S San Mateo Dr, Suite 206San Mateo, CA 94401 (650) 343‑4003
Specialties
- Family Practiceprimary
Other family doctors in San Mateo
Clinicians with the same Medicare primary specialty in San Mateo, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2022 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1326780115 |
| 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