NPPES file of Aug 9, 2026

Michael Tzyy-Shyan Chuang, DO

Sports Medicine (Family Medicine) Physician · San Marcos, CA

Michael Tzyy-Shyan Chuang, DO is a sports medicine (family medicine) physician with a practice address in San Marcos, California, and NPI 1487098802, issued on Apr 29, 2013. Check the license (California 20A13562, 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
1487098802
Name
Michael Tzyy-Shyan Chuang
Credential
DO
Primary taxonomy
Sports Medicine (Family Medicine) Physician 207QS0010X
License number
20A13562 CA
Self-reported in NPPES; status is on the state search
Practice location
400 Craven RD, San Marcos, CA 92078
Phone
(866) 459-2912
Enumerated
Apr 29, 2013
Record last updated
Sep 10, 2020 (not updated in 6 years: call before relying on the address or phone)
Medicare enrollment
Enrolled (PECOS I20171004002062); 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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8 nearest sports medicine (family medicine) physician records → All 266 in California → Look up another NPI →

Also registered at 400 Craven RD

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

  1. Tracy Abrams, R.N.Registered Nurse1073991261
  2. Eric Adiarte, M.D.Obstetrics & Gynecology Physician1902038284
  3. Shreya Aiyar, MDPediatrics Physician1922685981
  4. Najlaa Al-Jibouri, PHARM DPharmacist1447438965
  5. Jennifer Alexander, RCP, RRTPulmonary Function Technologist Certified Respiratory Therapist1023596442
  6. Marisa Alunni, M.D.Obstetrics & Gynecology Physician1710298476

Verify Michael Tzyy-Shyan Chuang in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersMedical Board of California
    Search for license 20A13562    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

PlainDoctor does not match the HHS-OIG exclusion list to individual records: most entries carry no NPI. Search the OIG exclusion list by name.

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87% fewer Medicare Part D claims than the average sports medicine (family medicine) physician in 2024

107 Medicare Part D claims for 54 beneficiaries, against an average of 855 among the 2,237 providers of this specialty who prescribed in Part D.

  1. Michael Chuang107
  2. Specialty average855

Most prescribed

  1. Meloxicam80 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. Southern California Permanente Medical GroupSan Marcos, CA

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

Michael Tzyy-Shyan Chuang among 266 sports medicine (family medicine) physician records in California

Michael Tzyy-Shyan Chuang, DO is one of 266 sports medicine (family medicine) physician records with a practice address in California. 84% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2013, is newer than 54% of them.

  • NPI issued2013 · 54% of these records are older, 41% newer
  • In a Medicare fileYes · 84% of these records are
  • In the CMS Doctors and Clinicians fileYes · 71% of these records are
  • Graduated2013 · median 2012 among the 190 with a school on file
  • Record last updated2020 · 43% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207QS0010X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Sports Medicine (Family Medicine) Physician providers in California

There are 266 sports medicine (family medicine) physician records in California.

All 266 in California → Every provider in San Marcos → Sports Medicine (Family Medicine) Physician nationwide →

The 8 sports medicine (family medicine) physician records with the nearest ZIP codes

  1. Richard Carreon, MDSan Marcos, CA 920781730440793
  2. Ashkan Salamatipour, DOVista, CA 920841457939043
  3. Scott Flinn, M.D.Poway, CA 920641184694598
  4. Brad Buchman, M.D.La Jolla, CA 920931972704906
  5. Craig Vantassel, D.O.Oceanside, CA 920581134562739
  6. Steve Christensen, D.O.Oceanside, CA 920561780988808
  7. Ronald Cohen, M.DOceanside, CA 920561073588786
  8. Scott Paradise, MDCamp Pendleton, CA 920551982054557

Common questions

What is Michael Tzyy-Shyan Chuang, DO's NPI number?

Michael Tzyy-Shyan Chuang, DO's National Provider Identifier (NPI) is 1487098802, issued on Apr 29, 2013. An NPI identifies a provider in billing; it is not a license.

Where is Michael Tzyy-Shyan Chuang, DO located?

The NPPES record lists a practice address at 400 Craven RD, San Marcos, CA, 92078. Phone: (866) 459-2912. Providers update this record themselves, so call before visiting.

How can I verify Michael Tzyy-Shyan Chuang, DO's license?

NPPES lists California license number 20A13562, 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 Michael Tzyy-Shyan Chuang, DO prescribe under Medicare Part D?

In 2024, Michael Tzyy-Shyan Chuang, DO had 107 Medicare Part D claims for 54 beneficiaries; the average among sports medicine (family medicine) physician prescribers was 855. 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.