Oswald Chan, M.D.
NPI 1780676882 · Family Medicine Physician · Chico, CA
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Oswald Chan, M.D. is a Family Medicine Physician provider in Chico, CA (NPI 1780676882).
Provider details
- NPI number
- 1780676882
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- License
- A66465 (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
20 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 · 48 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 288 | 93 |
| Metformin Hcl | 159 | 48 |
| Amlodipine Besylate | 155 | 42 |
| Famotidine | 122 | 49 |
| Losartan Potassium | 102 | 27 |
| Enalapril Maleate | 100 | 25 |
| Gabapentin | 99 | 34 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2005-08-16
- Last updated
- 2007-07-08
Frequently asked questions
- What is Oswald Chan's NPI number?
- Oswald Chan's National Provider Identifier (NPI) is 1780676882, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Oswald Chan's specialty?
- Oswald Chan is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Oswald Chan located?
- Oswald Chan's practice location on file with NPPES is 680 Cohasset Rd, Chico, CA 95926-2213.
- What is Oswald Chan's phone number?
- The practice phone number listed in the NPPES registry for Oswald Chan is (530) 342-4395.
- Does Oswald Chan accept Medicare?
- Oswald Chan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Oswald Chan's NPI active?
- Yes — Oswald Chan's NPI (1780676882) 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.