Maria R. Santos-Montemayor, MD
NPI 1316974397ActiveIndividual· Internal Medicine· Arcadia, CA
Internal Medicine (MD) with Healthcare Partners Affiliates Medical Group, practicing in Arcadia, California. Their prescriptions cost Medicare Part D more than their services did: $620,228 for 8,436 claims, against $24,261 paid for services in 2024. Inspire Medical Systems, Inc. reported $19.56 in payments in 2025, mostly food and beverage.
Overview
| NPI | 1316974397 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Jun 27, 2006 |
| Last updated in NPPES | Jan 9, 2026 |
| Certified by provider | Jan 9, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | 042995 | CT |
| Internal Medicine, Infectious Disease | 207RI0200X | A79424 | CA |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Nov 10, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 11, 2026 | No match | — |
| New York OMIG · Nov 11, 2026 | No match | — |
| Ohio Medicaid · Nov 11, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 11, 2026 | No match | — |
| Washington HCA · Nov 11, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Internal Medicine (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 112 |
|---|---|
| Services billed | 431 across 32 procedure codes |
| Paid by Medicare | $24,261 |
Part D prescriptions in 2024
| Prescriptions (claims) | 8,436 · 19,868 30-day fills |
|---|---|
| Patients | 668 |
| Total drug cost | $620,228 |
| Generic share | 91% of claims |
Education and affiliations
| Graduation year | 1989 |
|---|---|
| Medicare specialty | Internal Medicine |
| Secondary specialties | Infectious Disease |
| Telehealth | Offers telehealth |
Medical group
- Healthcare Partners Affiliates Medical GroupAnaheim, CA · 754 clinicians
Industry payments (Open Payments)
- 2025$19.56 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Inspire Medical Systems, Inc. | $19.56 | 1 |
What the 2025 payments were for
- Food and Beverage$19.56 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 100 internal medicine physicians in Arcadia · All internal medicine physicians in California