NPPES file of Aug 9, 2026

Wan-Yin Chan, M.D.

Allergy & Immunology Physician · Orange, CA

Wan-Yin Chan, M.D. is an allergy & immunology physician with a practice address in Orange, California, and NPI 1932391471, issued on Aug 17, 2007. Check the license (California A101604, 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
1932391471
Name
Wan-Yin Chan
Credential
M.D.
Primary taxonomy
Allergy & Immunology Physician 207K00000X
License number
A101604 CA
Self-reported in NPPES; status is on the state search
Practice location
725 W LA Veta Ave Ste 100, Orange, CA 92868
Phone
(714) 633-6363
Enumerated
Aug 17, 2007
Record last updated
Jan 9, 2013 (not updated in 13 years: call before relying on the address or phone)
Medicare enrollment
Enrolled (PECOS I20121106000155); 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 725 W LA Veta Ave Ste 100

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

  1. Diem-Tran Nguyen, MDAllergy & Immunology Physician1215498761

Verify Wan-Yin 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 A101604    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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80% fewer Medicare Part D claims than the average allergy & immunology physician in 2024

147 Medicare Part D claims for 25 beneficiaries, against an average of 741 among the 2,899 providers of this specialty who prescribed in Part D. Brand-name drugs were 61% of claims.

  1. Wan-Yin Chan147
  2. Specialty average741

Most prescribed

  1. Fluticasone Propionate17 claims
  2. Montelukast Sodium15 claims
  3. Dupixent Pen13 claims
  4. Xolair12 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.

Industry payments in 2024: $5,472.34

68 payments; by number, the most common kind was food and beverage; the largest payer was Csl Behring. The 2,496 providers of this specialty with any payment received $8,321.81 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.

  1. Wan-Yin Chan$5,472.34
  2. Specialty average$8,321.81

Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.

Bills Medicare through one group practice

  1. Childrens Hospital OF Orange CountyOrange, CA

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

Allergy & Immunology Physician providers in California

There are 444 allergy & immunology physician records in California.

All 444 in California → Every provider in Orange →

Other allergy & immunology physician records in California

  1. Edsel Abud, MD, PHDLa Jolla, CA1891257192
  2. Seema Aceves, M.D., PH.D.San Diego, CA1366511628
  3. Terrie Ahn, MDSanta Monica, CA1093166795
  4. Rhonda Alkatib, M.D.San Diego, CA1417363086
  5. Mercedes Amado, M.D.San Diego, CA1477510287
  6. Loula Amin, M.D.Newport Beach, CA1043452782
  7. A Aminian, M.D.Fresno, CA1508080193
  8. Ali Amirzadeh, M.D.Sacramento, CA1083748685
  9. Lorraine Anderson, MDSanta Monica, CA1013209568
  10. Joshua Ang, DOPasadena, CA1699398016

Common questions

What is Wan-Yin Chan, M.D.'s NPI number?

Wan-Yin Chan, M.D.'s National Provider Identifier (NPI) is 1932391471, issued on Aug 17, 2007. An NPI identifies a provider in billing; it is not a license.

Where is Wan-Yin Chan, M.D. located?

The NPPES record lists a practice address at 725 W LA Veta Ave Ste 100, Orange, CA, 92868. Phone: (714) 633-6363. Providers update this record themselves, so call before visiting.

How can I verify Wan-Yin Chan, M.D.'s license?

NPPES lists California license number A101604, 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 Wan-Yin Chan, M.D. prescribe under Medicare Part D?

In 2024, Wan-Yin Chan, M.D. had 147 Medicare Part D claims for 25 beneficiaries; the average among allergy & immunology physician prescribers was 741. 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.