Maria Mercedes Chang Villacreses, MD
NPI 1740675610ActiveIndividual· Internal Medicine, Endocrinology, Diabetes & Metabolism· Duarte, CA
Internal Medicine, Endocrinology, Diabetes & Metabolism (MD) with City of Hope Medical Foundation, practicing in Duarte, California. Their prescriptions cost Medicare Part D more than their services did: $1,146,604 for 2,919 claims, against $96,729 paid for services in 2024. Abbott Laboratories was the largest of 9 companies reporting payments in 2025, $1,759 in all, mostly food and beverage. Lists San Antonio Regional Hospital as a hospital affiliation.
Overview
| NPI | 1740675610 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | Yes |
| NPI issued | Mar 30, 2015 |
| Last updated in NPPES | Nov 20, 2020 |
| Certified by provider | Nov 20, 2020 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Endocrinology, Diabetes & Metabolism Primary | 207RE0101X | A155056 | CA |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 4, 2026 | No match | — |
| New York OMIG · Nov 4, 2026 | No match | — |
| Ohio Medicaid · Nov 4, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 4, 2026 | No match | — |
| Washington HCA · Nov 4, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Endocrinology (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 503 |
|---|---|
| Services billed | 1,465 across 18 procedure codes |
| Paid by Medicare | $96,729 |
Part D prescriptions in 2024
| Prescriptions (claims) | 2,919 · 6,482 30-day fills |
|---|---|
| Patients | 358 |
| Total drug cost | $1,146,604 |
| Generic share | 55% of claims |
Education and affiliations
| Graduation year | 2011 |
|---|---|
| Medicare specialty | Endocrinology |
| Telehealth | Offers telehealth |
Medical group
- City of Hope Medical FoundationDuarte, CA · 982 clinicians
Hospital affiliation
- San Antonio Regional HospitalUpland, CA
Industry payments (Open Payments)
- 2025$1,759 · 30 payments from 9 companies
- 2024$812.62 · 29 payments from 7 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Abbott Laboratories | $492.83 | 5 |
| Amgen Inc. | $385.58 | 7 |
| Novo Nordisk Inc | $251.62 | 3 |
| Medtronic, Inc. | $168.90 | 1 |
| Dexcom, Inc. | $138.84 | 8 |
What the 2025 payments were for
- Food and Beverage$1,759 · 30 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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