Theresa Chang, M.D.
NPI 1205134111 · Family Medicine Physician · Merced, CA
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Theresa Chang, M.D. is a Family Medicine Physician provider in Merced, CA (NPI 1205134111).
Provider details
- NPI number
- 1205134111
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
- License
- A115882 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
15 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 7 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 67 | 23 |
| Gabapentin | 28 | 12 |
| Morphine Sulfatebrand: Morphine Sulfate Er | 24 | — |
| Methadone Hcl | 21 | — |
| Fentanyl | 21 | — |
| Hydromorphone Hcl | 18 | — |
Practice location
Mailing address
Registry dates
- Enumerated
- 2011-03-02
- Last updated
- 2021-12-15
Frequently asked questions
- What is Theresa Chang's NPI number?
- Theresa Chang's National Provider Identifier (NPI) is 1205134111, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Theresa Chang's specialty?
- Theresa Chang is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Theresa Chang located?
- Theresa Chang's practice location on file with NPPES is 315 Mercy Ave Ste 301, Merced, CA 95340-8367.
- What is Theresa Chang's phone number?
- The practice phone number listed in the NPPES registry for Theresa Chang is (209) 564-3500.
- Does Theresa Chang accept Medicare?
- Theresa Chang is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Theresa Chang's NPI active?
- Yes — Theresa Chang's NPI (1205134111) is active in the NPPES registry as of the last update on 2021-12-15.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.