Regan Alexander Chan, D.O.
Family Medicine Physician · Orange, CA
Regan Alexander Chan, D.O. is a family medicine physician with a practice address in Orange, California, and NPI 1558546341, issued on Dec 31, 2007. Check the license (California 20A10204, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Regan Alexander Chan
- Credential
- D.O.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- 20A10204 CA
Self-reported in NPPES; status is on the state search - Practice location
- 293 S Main St, Orange, CA 92868
- Phone
- (714) 838-8848
- Enumerated
- Dec 31, 2007
- Record last updated
- Nov 3, 2022
- Medicare enrollment
- Enrolled (PECOS I20091203000733); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 17,133 in California → Look up another NPI →
Also registered at 293 S Main St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Samuel Lin, M.D.Family Medicine Physician1407910847
- Kenneth Tram, MDGeriatric Medicine (Internal Medicine) Physician1700875911
Verify Regan Alexander Chan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 20A10204Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
40% fewer Medicare Part D claims than the average family medicine physician in 2024
2,112 Medicare Part D claims for 174 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. 24 claims were for opioids.
Most prescribed
- Atorvastatin Calcium165 claims
- Levothyroxine Sodium117 claims
- Losartan Potassium87 claims
- Amlodipine Besylate86 claims
- Metformin Hcl77 claims
- Tamsulosin Hcl67 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
- Regents OF The University OF CaliforniaOrange, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Regan Alexander Chan among 17,133 family medicine physician records in California
Regan Alexander Chan, D.O. is one of 17,133 family medicine physician records with a practice address in California. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 41% of them.
- NPI issued2007 · 41% of these records are older, 47% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated2006 · median 2005 among the 10,652 with a school on file
- Record last updated2022 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
106 family medicine physician records list a practice address in Orange
They are 106 of the 13,245 NPPES records with a practice address in Orange, and 17,133 family medicine physician records in California.
All 17,133 in California → Every provider in Orange → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Latika Arsecularatne, M.D.Orange, CA 928681518070382
- Catherine Cummins, MDOrange, CA 928681003996109
- Prajakta Deshpande, MDOrange, CA 928681760576094
- Emily E Dow, MDOrange, CA 928681275613317
- Cecilia A Florio, MDOrange, CA 928681770663825
- Kathleen E Gallagher, MDOrange, CA 928681932289089
- Lisa M Gibbs, MDOrange, CA 928681578643623
- John A Heydt, MDOrange, CA 928681750461810
Common questions
What is Regan Alexander Chan, D.O.'s NPI number?
Regan Alexander Chan, D.O.'s National Provider Identifier (NPI) is 1558546341, issued on Dec 31, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Regan Alexander Chan, D.O. located?
The NPPES record lists a practice address at 293 S Main St, Orange, CA, 92868. Phone: (714) 838-8848. Providers update this record themselves, so call before visiting.
How can I verify Regan Alexander Chan, D.O.'s license?
NPPES lists California license number 20A10204, 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 Regan Alexander Chan, D.O. prescribe under Medicare Part D?
In 2024, Regan Alexander Chan, D.O. had 2,112 Medicare Part D claims for 174 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.
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.