Thomas Chan, M.D.
NPI 1255525309 · Internal Medicine Physician · Sacramento, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Thomas Chan, M.D. is a Internal Medicine Physician provider in Sacramento, CA (NPI 1255525309).
Provider details
- NPI number
- 1255525309
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- A101398 (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
18 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 · 19 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 46 | 39 |
| Amlodipine Besylate | 35 | 32 |
| Levothyroxine Sodium | 29 | 26 |
| Albuterol Sulfatebrand: Albuterol Sulfate Hfa | 24 | 24 |
| Losartan Potassium | 24 | 20 |
| Nirmatrelvir/Ritonavirbrand: Paxlovid | 23 | 23 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-08-31
- Last updated
- 2022-02-11
Frequently asked questions
- What is Thomas Chan's NPI number?
- Thomas Chan's National Provider Identifier (NPI) is 1255525309, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Thomas Chan's specialty?
- Thomas Chan is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Thomas Chan located?
- Thomas Chan's practice location on file with NPPES is 2345 Fair Oaks Blvd, Sacramento, CA 95825-4708.
- What is Thomas Chan's phone number?
- The practice phone number listed in the NPPES registry for Thomas Chan is (916) 973-5243.
- Does Thomas Chan accept Medicare?
- Thomas Chan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Thomas Chan's NPI active?
- Yes — Thomas Chan's NPI (1255525309) is active in the NPPES registry as of the last update on 2022-02-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.