John Charles Isaac, M.D.
NPI 1295799005ActiveIndividual· Internal Medicine, Interventional Cardiology· Houston, TX
Internal Medicine, Interventional Cardiology (M.D.) in Houston, Texas, trained at University of Texas Southwestern Medical School at Dallas (class of 1994). Their prescriptions cost Medicare Part D more than their services did: $4,823,673 for 18,588 claims, against $1,788,203 paid for services in 2024. Amgen Inc. was the largest of 27 companies reporting payments in 2025, $214,376 in all, mostly speaking and faculty fees.
Overview
| NPI | 1295799005 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Apr 17, 2006 |
| Last updated in NPPES | Oct 25, 2016 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Interventional Cardiology Primary | 207RI0011X | K4090 | TX |
| Internal Medicine, Cardiovascular Disease | 207RC0000X | K4090 | TX |
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 - Cardiovascular Disease (Cardiology) (TX) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 1,253 |
|---|---|
| Services billed | 9,530 across 73 procedure codes |
| Paid by Medicare | $1,788,203 |
Part D prescriptions in 2024
| Prescriptions (claims) | 18,588 · 49,179 30-day fills |
|---|---|
| Patients | 1,569 |
| Total drug cost | $4,823,673 |
| Generic share | 76% of claims |
Education and affiliations
| Medical school | University of Texas Southwestern Medical School at Dallas |
|---|---|
| Graduation year | 1994 |
| Medicare specialty | Cardiovascular Disease (Cardiology) |
| Telehealth | Offers telehealth |
Medical group
- Houston Cardiovascular Assoc PAHouston, TX · 82 clinicians
Hospital affiliations
- Houston Methodist Cypress HospitalCypress, TX
- Houston Methodist HospitalHouston, TX
- Houston Methodist Willowbrook HospitalHouston, TX
Other facilities
- Pinard Home Health IncHome health agency · Spring, TX
Industry payments (Open Payments)
- 2025$214,376 · 383 payments from 27 companies
- 2024$199,612 · 423 payments from 30 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Amgen Inc. | $127,762 | 185 |
| Regeneron Healthcare Solutions, Inc. | $21,212 | 38 |
| E.R. Squibb & Sons, L.L.C. | $20,135 | 27 |
| Heartflow, Inc. | $19,530 | 23 |
| Lilly USA, LLC | $13,965 | 14 |
What the 2025 payments were for
- Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program$171,043 · 77 payments
- Travel and Lodging$19,031 · 127 payments
- Consulting Fee$15,908 · 3 payments
- Food and Beverage$8,374 · 175 payments
- Education$20.22 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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