Gregory Morris Giesler, MD
NPI 1477518454ActiveIndividual· Internal Medicine, Cardiovascular Disease· Pasadena, CA
Internal Medicine, Cardiovascular Disease (MD) in Pasadena, California, trained at Chicago College of Medicine and Surgery (class of 1999). Their prescriptions cost Medicare Part D more than their services did: $2,271,501 for 8,413 claims, against $986,288 paid for services in 2024. Bridgebio Pharma, Inc. was the largest of 20 companies reporting payments in 2025, $2,425 in all, mostly food and beverage.
Overview
| NPI | 1477518454 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Apr 20, 2006 |
| Last updated in NPPES | Apr 12, 2011 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Cardiovascular Disease Primary | 207RC0000X | A75160 | 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 - Cardiovascular Disease (Cardiology) (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 2,229 |
|---|---|
| Services billed | 24,764 across 70 procedure codes |
| Paid by Medicare | $986,288 |
Part D prescriptions in 2024
| Prescriptions (claims) | 8,413 · 18,942 30-day fills |
|---|---|
| Patients | 891 |
| Total drug cost | $2,271,501 |
| Generic share | 81% of claims |
Education and affiliations
| Medical school | Chicago College of Medicine and Surgery |
|---|---|
| Graduation year | 1999 |
| Medicare specialty | Cardiovascular Disease (Cardiology) |
| Telehealth | Offers telehealth |
Medical group
- Southern California Heart SpecialistsArcadia, CA · 6 clinicians
Hospital affiliations
- Cedars-Sinai Medical CenterLos Angeles, CA
- Huntington HospitalPasadena, CA
- Usc Arcadia HospitalArcadia, CA
Industry payments (Open Payments)
- 2025$2,425 · 96 payments from 20 companies
- 2024$3,160 · 134 payments from 22 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Bridgebio Pharma, Inc. | $364.90 | 8 |
| Merck Sharp & Dohme LLC | $312.36 | 11 |
| Pfizer Inc. | $304.24 | 16 |
| Astrazeneca Pharmaceuticals LP | $240.65 | 13 |
| Novartis Pharmaceuticals Corporation | $218.64 | 11 |
What the 2025 payments were for
- Food and Beverage$2,425 · 96 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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