Mark Showen, M.D.
NPI 1477576817 · Pediatrics Physician · San Mateo, CA
Enrolled with Medicare as Practitioner - Pediatric Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Showen, M.D. is a Pediatrics Physician provider in San Mateo, CA (NPI 1477576817).
Provider details
- NPI number
- 1477576817
- Entity type
- Individual
- Primary specialty
- Pediatrics PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- G052160 (CA)
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
19 yrs in NPPES 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
- 2006-07-26
- Last updated
- 2007-07-08
Frequently asked questions
- What is Mark Showen's NPI number?
- Mark Showen's National Provider Identifier (NPI) is 1477576817, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Showen's specialty?
- Mark Showen is listed in the NPPES registry with a primary specialty of Pediatrics Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Showen located?
- Mark Showen's practice location on file with NPPES is 50 S San Mateo Dr, San Mateo, CA 94401-3857.
- What is Mark Showen's phone number?
- The practice phone number listed in the NPPES registry for Mark Showen is (650) 342-4145.
- Does Mark Showen accept Medicare?
- Mark Showen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Showen's NPI active?
- Yes — Mark Showen's NPI (1477576817) is active in the NPPES registry as of the last update on 2007-07-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.