Margarita M. Ontiveros, MD
NPI 1346310968ActiveIndividual· Internal Medicine, Cardiovascular Disease· San Antonio, TX
Internal Medicine, Cardiovascular Disease (MD) in San Antonio, Texas, trained at Un of California, Irvine, College of Medicine (class of 1987). Their prescriptions cost Medicare Part D more than their services did: $786,644 for 4,425 claims, against $73,892 paid for services in 2024. Penumbra, Inc. was the largest of 22 companies reporting payments in 2025, $2,844 in all, mostly food and beverage.
Overview
| NPI | 1346310968 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | Yes |
| NPI issued | Nov 9, 2006 |
| Last updated in NPPES | May 1, 2008 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Cardiovascular Disease Primary | 207RC0000X | H5196 | TX |
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 - Cardiovascular Disease (Cardiology) (TX) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 251 |
|---|---|
| Services billed | 1,030 across 37 procedure codes |
| Paid by Medicare | $73,892 |
Part D prescriptions in 2024
| Prescriptions (claims) | 4,425 · 11,695 30-day fills |
|---|---|
| Patients | 898 |
| Total drug cost | $786,644 |
| Generic share | 85% of claims |
Education and affiliations
| Medical school | Un of California, Irvine, College of Medicine |
|---|---|
| Graduation year | 1987 |
| Medicare specialty | Cardiovascular Disease (Cardiology) |
Medical group
- Methodist Physician Practices PLLCLive Oak, TX · 175 clinicians
Industry payments (Open Payments)
- 2025$2,844 · 85 payments from 22 companies
- 2024$5,164 · 122 payments from 26 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Penumbra, Inc. | $748.85 | 6 |
| Medtronic, Inc. | $508.55 | 4 |
| Cvrx, Inc. | $274.79 | 19 |
| Novartis Pharmaceuticals Corporation | $182.20 | 10 |
| Abbott Laboratories | $141.47 | 2 |
What the 2025 payments were for
- Food and Beverage$2,844 · 85 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 192 cardiologists in San Antonio · All cardiologists in Texas