John a Ritzo MD Medical Corporation
NPI 1427948264 · Family Medicine Physician · San Mateo, CA
Enrolled with Medicare as Part B Supplier - Clinic/Group Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
John a Ritzo MD Medical Corporation is a Family Medicine Physician organization in San Mateo, CA (NPI 1427948264).
Provider details
- NPI number
- 1427948264
- Entity type
- Organization
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Organization subpart
- No
- Authorized official
- Johna Ritzo, Physician / Owner(650) 533-7211
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
Under 1 yr in 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
- 2025-07-03
- Last updated
- 2025-07-03
- Certified
- 2025-07-03
Frequently asked questions
- What is John a Ritzo MD Medical Corporation's NPI number?
- John a Ritzo MD Medical Corporation's National Provider Identifier (NPI) is 1427948264, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What type of organization is John a Ritzo MD Medical Corporation?
- John a Ritzo MD Medical Corporation is classified in the NPPES registry as Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is John a Ritzo MD Medical Corporation located?
- John a Ritzo MD Medical Corporation's practice location on file with NPPES is 101 S San Mateo Dr Ste 206, San Mateo, CA 94401-3843.
- What is John a Ritzo MD Medical Corporation's phone number?
- The practice phone number listed in the NPPES registry for John a Ritzo MD Medical Corporation is (650) 343-4003.
- Does John a Ritzo MD Medical Corporation accept Medicare?
- John a Ritzo MD Medical Corporation is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Who is the authorized official for John a Ritzo MD Medical Corporation?
- The authorized official listed on John a Ritzo MD Medical Corporation's NPPES record is Johna Ritzo, Physician / Owner. The authorized official registers and maintains the organization's NPI and is not necessarily its owner.
- Is John a Ritzo MD Medical Corporation's NPI active?
- Yes — John a Ritzo MD Medical Corporation's NPI (1427948264) is active in the NPPES registry as of the last update on 2025-07-03.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.