Willis L. Chang
Internal Medicine Physician · Fresno, CA
Willis L. Chang is an internal medicine physician with a practice address in Fresno, California, and NPI 1831496538, issued on Feb 16, 2011. Check the license (California A130760, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Willis L. Chang
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A130760 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1221 E Spruce Ave, Fresno, CA 93720
- Phone
- (559) 450-5777
- Enumerated
- Feb 16, 2011
- Record last updated
- Sep 18, 2014 (not updated in 12 years: call before relying on the address or phone)
- Fax
- (559) 449-2654
- Medicare enrollment
- Enrolled (PECOS I20141106000067); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 1221 E Spruce Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Willis L. Chang in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A130760Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
95% fewer Medicare Part D claims than the average internal medicine physician in 2024
174 Medicare Part D claims for 53 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 9% of claims.
Most prescribed
- Atorvastatin Calcium26 claims
- Amlodipine Besylate18 claims
- Benazepril Hcl16 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
- County OF Los AngelesLos Angeles, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Willis L. Chang among 17,696 internal medicine physician records in California
Willis L. Chang is one of 17,696 internal medicine physician records with a practice address in California. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2011, is newer than 66% of them.
- NPI issued2011 · 66% of these records are older, 32% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated2001 · median 2004 among the 11,065 with a school on file
- Record last updated2014 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
335 internal medicine physician records list a practice address in Fresno
They are 335 of the 19,440 NPPES records with a practice address in Fresno, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Fresno → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Linda Bartell, MDFresno, CA 937201568458966
- Brenda Berry, MDFresno, CA 937201942295381
- Roger Gong, MDFresno, CA 937201598751059
- Alex Habibe, MDFresno, CA 937201629075395
- Dharampal Johal, M.D.Fresno, CA 937201275530529
- Helen Jones, MDFresno, CA 937201164418372
- Carol Kim, M.D.Fresno, CA 937201285629303
- Jean Linder, MDFresno, CA 937201962498428
Common questions
What is Willis L. Chang's NPI number?
Willis L. Chang's National Provider Identifier (NPI) is 1831496538, issued on Feb 16, 2011. An NPI identifies a provider in billing; it is not a license.
Where is Willis L. Chang located?
The NPPES record lists a practice address at 1221 E Spruce Ave, Fresno, CA, 93720. Phone: (559) 450-5777. Providers update this record themselves, so call before visiting.
How can I verify Willis L. Chang's license?
NPPES lists California license number A130760, 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 Willis L. Chang prescribe under Medicare Part D?
In 2024, Willis L. Chang had 174 Medicare Part D claims for 53 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.