Michael Yao-Jen Chang, D.O.
Pain Medicine (Physical Medicine & Rehabilitation) Physician · Walnut Creek, CA
Michael Yao-Jen Chang, D.O. is a pain medicine (physical medicine & rehabilitation) physician with a practice address in Walnut Creek, California, and NPI 1205934262, issued on Sep 20, 2006. Check the license (California 20A8518, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Michael Yao-Jen Chang
- Credential
- D.O.
- Primary taxonomy
- Pain Medicine (Physical Medicine & Rehabilitation) Physician 2081P2900X
- License number
- 20A8518 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2405 Shadelands Dr, Walnut Creek, CA 94598
- Phone
- (925) 939-8585
- Enumerated
- Sep 20, 2006
- Record last updated
- Nov 7, 2025
- Fax
- (925) 933-2709
- Medicare enrollment
- Enrolled (PECOS I20070703000627); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest pain medicine (physical medicine & rehabilitation) physician records → All 290 in California → Look up another NPI →
Also registered at 2405 Shadelands Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Divya Anand, PHYSICAL THERAPISTPhysical Therapist1801989272
- David Arakawa, P.T.Orthopedic Physical Therapist1114955820
- Kevin Byrne, PASurgical Physician Assistant1306499272
- Michael Cadette, PA-CPhysician Assistant1689075236
- Leo Calafi, MDOrthopaedic Surgery Physician1720079072
- David Contreras, M.D.Orthopaedic Surgery Physician1821048216
Verify Michael Yao-Jen Chang in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 20A8518Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
73% fewer Medicare Part D claims than the average pain medicine (physical medicine & rehabilitation) physician in 2024
396 Medicare Part D claims for 180 beneficiaries, against an average of 1,479 among the 1,457 providers of this specialty who prescribed in Part D. 37 claims were for opioids.
Most prescribed
- Baclofen146 claims
- Gabapentin79 claims
- Diazepam32 claims
- Celecoxib22 claims
- Meloxicam19 claims
- Ibuprofen17 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.
No measured MIPS final score for 2023
CMS assigned the neutral MIPS final score of 75 without scoring Quality, Cost, Promoting Interoperability or Improvement Activities. It is an administrative threshold, so PlainDoctor does not compare it with measured clinicians.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $90.75
2 payments; by number, the most common kind was food and beverage; the largest payer was Saluda Medical Americas, Inc. The 1,126 providers of this specialty with any payment received $2,193.30 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
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
- Golden State Orthopedics And SpineBrentwood, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Michael Yao-Jen Chang among 290 pain medicine (physical medicine & rehabilitation) physician records in California
Michael Yao-Jen Chang, D.O. is one of 290 pain medicine (physical medicine & rehabilitation) physician records with a practice address in California. 85% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 7% of them.
- NPI issued2006 · 7% of these records are older, 60% newer
- In a Medicare fileYes · 85% of these records are
- In the CMS Doctors and Clinicians fileYes · 68% of these records are
- Graduated2002 · median 2005 among the 196 with a school on file
- Record last updated2025 · 50% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2081P2900X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Pain Medicine (Physical Medicine & Rehabilitation) Physician providers in California
There are 290 pain medicine (physical medicine & rehabilitation) physician records in California.
All 290 in California → Every provider in Walnut Creek → Pain Medicine (Physical Medicine & Rehabilitation) Physician nationwide →
The 8 pain medicine (physical medicine & rehabilitation) physician records with the nearest ZIP codes
- David Chow, M.D.Walnut Creek, CA 945981700823762
- Carl Fieser, M.D.Walnut Creek, CA 945981346515319
- Kenneth Kim, MDWalnut Creek, CA 945981154325777
- Mikiko Murakami, DOWalnut Creek, CA 945971659632339
- Robert Millard, MDRedwood City, CA 946031699729426
- Alan Kimelman, M.D.Vallejo, CA 945901558474866
- Ryan Ferguson, DOUnion City, CA 945871487116000
- Michael Hebrard, MDOakland, CA 946101861575300
Common questions
What is Michael Yao-Jen Chang, D.O.'s NPI number?
Michael Yao-Jen Chang, D.O.'s National Provider Identifier (NPI) is 1205934262, issued on Sep 20, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Michael Yao-Jen Chang, D.O. located?
The NPPES record lists a practice address at 2405 Shadelands Dr, Walnut Creek, CA, 94598. Phone: (925) 939-8585. Providers update this record themselves, so call before visiting.
How can I verify Michael Yao-Jen Chang, D.O.'s license?
NPPES lists California license number 20A8518, 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 Yao-Jen Chang, D.O. prescribe under Medicare Part D?
In 2024, Michael Yao-Jen Chang, D.O. had 396 Medicare Part D claims for 180 beneficiaries; the average among pain medicine (physical medicine & rehabilitation) physician prescribers was 1,479. Part D covers Medicare prescriptions only.
What is Michael Yao-Jen Chang, D.O.'s MIPS final score?
CMS assigned the neutral MIPS final score of 75 for 2023 without scoring any category, so it is not a measured result.
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.