NPPES file of Aug 9, 2026

Oswald Chi-Kin Chan, M.D.

Family Medicine Physician · Chico, CA

Oswald Chi-Kin Chan, M.D. is a family medicine physician with a practice address in Chico, California, and NPI 1780676882, issued on Aug 16, 2005. Check the license (California A66465, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · Medicare files 2024 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1780676882
Name
Oswald Chi-Kin Chan
Credential
M.D.
Primary taxonomy
Family Medicine Physician 207Q00000X
License number
A66465 CA
Self-reported in NPPES; status is on the state search
Practice location
680 Cohasset RD, Chico, CA 95926
Phone
(530) 342-4395
Enumerated
Aug 16, 2005
Record last updated
Jul 13, 2026
Fax
(530) 894-2325
Medicare enrollment
Enrolled (PECOS I20140520002027); accepts Medicare assignment
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
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Also registered at 680 Cohasset RD

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Ejaz Ahmed, M.D.Pediatrics Physician1699775734
  2. Abdullah Al Dwairi, M.D.Internal Medicine Physician1639170806
  3. Marianna Almanza, PA-CPhysician Assistant1720542491
  4. Nasrin Ashouian, MDNephrology Physician1053522342
  5. Marytere Carrasquillo Navarro, MDInternal Medicine Physician1851751408
  6. Ammar Changezi, MDPediatrics Physician1538428040

Verify Oswald Chi-Kin Chan in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersMedical Board of California
    Search for license A66465    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Open the California license search

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28% fewer Medicare Part D claims than the average family medicine physician in 2024

2,553 Medicare Part D claims for 160 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 16% of claims. 12 claims were for opioids.

  1. Oswald Chan2,553
  2. Specialty average3,544

Most prescribed

  1. Atorvastatin Calcium288 claims
  2. Metformin Hcl159 claims
  3. Amlodipine Besylate155 claims
  4. Famotidine122 claims
  5. Losartan Potassium102 claims
  6. Enalapril Maleate100 claims

Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.

Bills Medicare through one group practice

  1. The Los Angeles Free ClinicLos Angeles, CA

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).

43 family medicine physician records list a practice address in Chico

They are 43 of the 3,684 NPPES records with a practice address in Chico, and 17,133 family medicine physician records in California.

All 43 in Chico → All 17,133 in California → Every provider in Chico →

Other family medicine physician records in California

  1. Omer Aba-Omer, MDSanta Monica, CA1649702093
  2. Michelle Ababa, MDWilmington, CA1710922513
  3. Anna Tzeitel Abalos, MDRoseville, CA1720200017
  4. Adan Abarca, MDAnaheim, CA1760553689
  5. Vanessa Abarca, DOVentura, CA1952040859
  6. Lorraine Abate, M.D.Sacramento, CA1104840008
  7. Robert Abatecola, MDCastro Valley, CA1669551719
  8. Romeo Abaya, M.D.Cottonwood, CA1598053506
  9. Effiem Abbah, MD, MPHSan Francisco, CA1821185133
  10. Khuzeman Abbasi, MDSanta Rosa, CA1841979952

Common questions

What is Oswald Chi-Kin Chan, M.D.'s NPI number?

Oswald Chi-Kin Chan, M.D.'s National Provider Identifier (NPI) is 1780676882, issued on Aug 16, 2005. An NPI identifies a provider in billing; it is not a license.

Where is Oswald Chi-Kin Chan, M.D. located?

The NPPES record lists a practice address at 680 Cohasset RD, Chico, CA, 95926. Phone: (530) 342-4395. Providers update this record themselves, so call before visiting.

How can I verify Oswald Chi-Kin Chan, M.D.'s license?

NPPES lists California license number A66465, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.

How much does Oswald Chi-Kin Chan, M.D. prescribe under Medicare Part D?

In 2024, Oswald Chi-Kin Chan, M.D. had 2,553 Medicare Part D claims for 160 beneficiaries; the average among family medicine physician prescribers was 3,544. Part D covers Medicare prescriptions only.

Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.