Theresa T. Chang, M.D.
Family Medicine Physician · Merced, CA
Theresa T. Chang, M.D. is a family medicine physician with a practice address in Merced, California, and NPI 1205134111, issued on Mar 2, 2011. Check the license (California A115882, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Theresa T. Chang
- Credential
- M.D.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- A115882 CA
Self-reported in NPPES; status is on the state search - Practice location
- 315 Mercy Ave Ste 301, Merced, CA 95340
- Phone
- (209) 564-3500
- Enumerated
- Mar 2, 2011
- Record last updated
- Dec 15, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20130228000163); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 17,133 in California → Look up another NPI →
Also registered at 315 Mercy Ave Ste 301
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Sandro CeromeStudent in an Organized Health Care Education/Training Program1033969936
- Rimsha ChaudhryStudent in an Organized Health Care Education/Training Program1679260483
- Eric Cristobal, MDFamily Medicine Physician1710674510
- Kamindara Dhillon, MDFamily Medicine Physician1497335012
Verify Theresa T. Chang in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A115882Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
93% fewer Medicare Part D claims than the average family medicine physician in 2024
263 Medicare Part D claims for 55 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. 177 claims were for opioids.
Most prescribed
- Hydrocodone-Acetaminophen67 claims
- Gabapentin28 claims
- Morphine Sulfate Er24 claims
- Fentanyl21 claims
- Methadone Hcl21 claims
- Hydromorphone Hcl18 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
- Permanente Medical Group IncFresno, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Theresa T. Chang among 17,133 family medicine physician records in California
Theresa T. Chang, M.D. is one of 17,133 family medicine physician records with a practice address in California. 81% 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 63% of them.
- NPI issued2011 · 63% of these records are older, 34% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated2002 · median 2005 among the 10,652 with a school on file
- Record last updated2021 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
94 family medicine physician records list a practice address in Merced
They are 94 of the 2,836 NPPES records with a practice address in Merced, and 17,133 family medicine physician records in California.
All 17,133 in California → Every provider in Merced → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Vincent Ansley, MDMerced, CA 953401871584185
- David Barabe, M.D.Merced, CA 953401255361770
- Albert Col, M.D.Merced, CA 953401952411266
- Timothy Johnston, M.D.Merced, CA 953401528097847
- Jeanette Kuizon, MDMerced, CA 953401962485243
- Aimee NagtalonMerced, CA 953401487698221
- George Nevatt, MDMerced, CA 953401538194196
- Maciej Ossowski, M. D.Merced, CA 953401346207883
Common questions
What is Theresa T. Chang, M.D.'s NPI number?
Theresa T. Chang, M.D.'s National Provider Identifier (NPI) is 1205134111, issued on Mar 2, 2011. An NPI identifies a provider in billing; it is not a license.
Where is Theresa T. Chang, M.D. located?
The NPPES record lists a practice address at 315 Mercy Ave Ste 301, Merced, CA, 95340. Phone: (209) 564-3500. Providers update this record themselves, so call before visiting.
How can I verify Theresa T. Chang, M.D.'s license?
NPPES lists California license number A115882, 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 Theresa T. Chang, M.D. prescribe under Medicare Part D?
In 2024, Theresa T. Chang, M.D. had 263 Medicare Part D claims for 55 beneficiaries; the average among family medicine physician prescribers was 3,544. 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.