Mark Gerard Byrne, M.D.
NPI 1962411272ActiveIndividual· Internal Medicine, Interventional Cardiology· Watsonville, CA
Internal Medicine, Interventional Cardiology (M.D.) in Watsonville, California, trained at Illinois Medical College (class of 1989). In 2024 Medicare paid $814,384 for 471 patients, and Part D covered 8,839 of their prescriptions, 85% of them generic. Heartflow, Inc. was the largest of 17 companies reporting payments in 2025, $1,239 in all, mostly food and beverage.
Overview
| NPI | 1962411272 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | Yes |
| NPI issued | Aug 5, 2006 |
| Last updated in NPPES | Jul 8, 2007 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Interventional Cardiology Primary | 207RI0011X | G74388 | 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 - Cardiovascular Disease (Cardiology) (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 471 |
|---|---|
| Services billed | 12,468 across 98 procedure codes |
| Paid by Medicare | $814,384 |
Part D prescriptions in 2024
| Prescriptions (claims) | 8,839 · 17,928 30-day fills |
|---|---|
| Patients | 480 |
| Total drug cost | $1,142,684 |
| Generic share | 85% of claims |
Education and affiliations
| Medical school | Illinois Medical College |
|---|---|
| Graduation year | 1989 |
| Medicare specialty | Cardiovascular Disease (Cardiology) |
| Secondary specialties | Internal Medicine |
| Telehealth | Offers telehealth |
Medical group
- Brennan Medical CorporationWatsonville, CA · 2 clinicians
Hospital affiliation
- Watsonville Community HospitalWatsonville, CA
Other facilities
- Bridge Home HealthHome health agency · Salinas, CA
- Care MustHome health agency · San Jose, CA
- Choice Home Health CareHome health agency · Monterey, CA
- Prohealth Home Care, IncHome health agency · San Jose, CA
- Watsonville Post Acute CenterNursing home · Watsonville, CA
Industry payments (Open Payments)
- 2025$1,239 · 36 payments from 17 companies
- 2024$1,164 · 46 payments from 17 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Heartflow, Inc. | $338.30 | 3 |
| Novo Nordisk Inc | $275.83 | 11 |
| Bayer Healthcare Pharmaceuticals Inc. | $172.23 | 3 |
| Astrazeneca Pharmaceuticals LP | $60.30 | 3 |
| Itamar Medical Inc | $56.66 | 1 |
What the 2025 payments were for
- Food and Beverage$1,239 · 36 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records