Walter Ting Yu Chang, MD
Surgery of the Hand (Surgery) Physician · Fontana, CA
Walter Ting Yu Chang, MD is a surgery of the hand (surgery) physician with a practice address in Fontana, California, and NPI 1083781835, issued on Nov 29, 2006. Check the license (California A91041, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Walter Ting Yu Chang
- Credential
- MD
- Primary taxonomy
- Surgery of the Hand (Surgery) Physician 2086S0105X
- License number
- A91041 CA
Self-reported in NPPES; status is on the state search - Practice location
- 9961 Sierra Ave, Fontana, CA 92335
- Phone
- (909) 427-3910
- Enumerated
- Nov 29, 2006
- Record last updated
- Nov 18, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20051122000814); accepts Medicare assignment
- Medical or professional school
- Geisel School Of Medicine At Dartmouth, 2000
- Entity
- Type 1 · individual
8 nearest surgery of the hand (surgery) physician records → All 39 in California → Look up another NPI →
Also registered at 9961 Sierra Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Walter Ting Yu Chang in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A91041Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
52% fewer Medicare Part D claims than the average surgery of the hand (surgery) physician in 2024
91 Medicare Part D claims for 59 beneficiaries, against an average of 188 among the 346 providers of this specialty who prescribed in Part D. 45 claims were for opioids.
Most prescribed
- Hydrocodone-Acetaminophen31 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: $477.52
2 payments; by number, the most common kind was food and beverage; the largest payer was KLS-Martin L.P. The 296 providers of this specialty with any payment received $4,725.83 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
- Southern California Permanente Medical GroupOntario, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Walter Ting Yu Chang among 39 surgery of the hand (surgery) physician records in California
Walter Ting Yu Chang, MD is one of 39 surgery of the hand (surgery) physician records with a practice address in California. 77% 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 10% of them.
- NPI issued2006 · 10% of these records are older, 49% newer
- In a Medicare fileYes · 77% of these records are
- In the CMS Doctors and Clinicians fileYes · 74% of these records are
- Graduated2000 · median 2000 among the 29 with a school on file
- Record last updated2021 · 69% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2086S0105X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Surgery of the Hand (Surgery) Physician providers in California
There are 39 surgery of the hand (surgery) physician records in California.
All 39 in California → Every provider in Fontana → Surgery of the Hand (Surgery) Physician nationwide →
The 8 surgery of the hand (surgery) physician records with the nearest ZIP codes
- Sharon Kalina, MDFontana, CA 923351053488908
- Ravi Kiran, MDFontana, CA 923351952459984
- Stephen West, MDFontana, CA 923351194873075
- Julie Gilbert, M.D.San Diego, CA 921231659378990
- Gregory Mack, M.D.San Diego, CA 921231528169513
- David Subin, M.D.San Diego, CA 921231770694622
- Anisa Yalom, MDSan Marcos, CA 920691164679908
- Grant Seiden, MDOceanside, CA 920561992025407
Common questions
What is Walter Ting Yu Chang, MD's NPI number?
Walter Ting Yu Chang, MD's National Provider Identifier (NPI) is 1083781835, issued on Nov 29, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Walter Ting Yu Chang, MD located?
The NPPES record lists a practice address at 9961 Sierra Ave, Fontana, CA, 92335. Phone: (909) 427-3910. Providers update this record themselves, so call before visiting.
How can I verify Walter Ting Yu Chang, MD's license?
NPPES lists California license number A91041, 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 Walter Ting Yu Chang, MD prescribe under Medicare Part D?
In 2024, Walter Ting Yu Chang, MD had 91 Medicare Part D claims for 59 beneficiaries; the average among surgery of the hand (surgery) physician prescribers was 188. 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.