Clayton Chan, MD
NPI 1972682037 · Internal Medicine Physician · Oakland, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Clayton Chan, MD is a Internal Medicine Physician provider in Oakland, CA (NPI 1972682037).
Provider details
- NPI number
- 1972682037
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- A68139 (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.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 43 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 310 | 96 |
| Amlodipine Besylate | 281 | 87 |
| Metformin Hcl | 142 | 41 |
| Lisinopril | 139 | 44 |
| Losartan Potassium | 138 | 44 |
| Metoprolol Succinate | 109 | 32 |
| Simvastatin | 100 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-11-02
- Last updated
- 2007-07-08
Frequently asked questions
- What is Clayton Chan's NPI number?
- Clayton Chan's National Provider Identifier (NPI) is 1972682037, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Clayton Chan's specialty?
- Clayton Chan is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Clayton Chan located?
- Clayton Chan's practice location on file with NPPES is 818 Webster St, Oakland, CA 94607-4220.
- What is Clayton Chan's phone number?
- The practice phone number listed in the NPPES registry for Clayton Chan is (510) 986-6830.
- Does Clayton Chan accept Medicare?
- Clayton Chan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Clayton Chan's NPI active?
- Yes — Clayton Chan's NPI (1972682037) 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.