Clay Napper, M.D.
NPI 1053352815 · Diagnostic Radiology Physician · San Mateo, CA
Enrolled with Medicare as Practitioner - Diagnostic Radiology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Clay Napper, M.D. is a Diagnostic Radiology Physician provider in San Mateo, CA (NPI 1053352815).
Provider details
- NPI number
- 1053352815
- Entity type
- Individual
- Primary specialty
- Diagnostic Radiology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- G78045 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
20 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
5 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
2,608 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. 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.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| X-Ray of Chest, 1 View71045 | 473 | $10 |
| Ct Scan Head Or Brain Without Contrast70450 | 202 | $46 |
| X-Ray of Chest, 2 Views71046 | 191 | $12 |
| Dxa Bone Density Measurement of Hip, Pelvis, Spine77080 | 179 | $11 |
| Ct Scan of Abdomen and Pelvis With Contrast74177 | 110 | $101 |
| Nuclear Medicine Study From Skull Base to Mid-Thigh With Ct Scan78815 | 96 | $131 |
Practice location
Mailing address
Additional practice locations (4)
- 1720 El Camino Real Ste 118Burlingame, CA 94010-3225Phone: (650) 696-7850Fax: (650) 696-3677
- 1501 Trousdale DrBurlingame, CA 94010-4506Phone: (650) 696-5515Fax: (650) 696-5280
- 222 W 39th AveSan Mateo, CA 94403-4364Phone: (650) 573-2222Fax: (650) 573-2122
- 935 El Camino RealSouth San Francisco, CA 94080-3203Phone: (650) 873-1050Fax: (650) 873-2174
Registry dates
- Enumerated
- 2006-06-10
- Last updated
- 2021-03-19
- Certified
- 2021-03-18
Frequently asked questions
- What is Clay Napper's NPI number?
- Clay Napper's National Provider Identifier (NPI) is 1053352815, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Clay Napper's specialty?
- Clay Napper is listed in the NPPES registry with a primary specialty of Diagnostic Radiology Physician (Allopathic & Osteopathic Physicians).
- Where is Clay Napper located?
- Clay Napper's practice location on file with NPPES is 100 S San Mateo Dr, San Mateo, CA 94401-3805.
- What is Clay Napper's phone number?
- The practice phone number listed in the NPPES registry for Clay Napper is (650) 696-4515.
- Does Clay Napper accept Medicare?
- Clay Napper is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Clay Napper's NPI active?
- Yes — Clay Napper's NPI (1053352815) is active in the NPPES registry as of the last update on 2021-03-19.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.