Ronald Marc Witteles, MD
NPI 1285779389ActiveIndividual· Internal Medicine, Advanced Heart Failure and Transplant Cardiology· Stanford, CA
Internal Medicine, Advanced Heart Failure and Transplant Cardiology (MD) in Stanford, California, trained at University of Chicago, Pritzker School of Medicine (class of 2000). Their prescriptions cost Medicare Part D more than their services did: $17,921,531 for 3,519 claims, against $92,507 paid for services in 2024. Pfizer Inc. was the largest of 5 companies reporting payments in 2025, $39,578 in all, mostly consulting fees.
Overview
| NPI | 1285779389 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Feb 20, 2007 |
| Last updated in NPPES | Apr 26, 2024 |
| Certified by provider | Apr 26, 2024 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Advanced Heart Failure and Transplant Cardiology Primary | 207RA0001X | A76510 | CA |
| Internal Medicine | 207R00000X | A76510 | CA |
| Internal Medicine, Cardiovascular Disease | 207RC0000X | A76510 | 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 10, 2026 | No match | — |
| New York OMIG · Nov 10, 2026 | No match | — |
| Ohio Medicaid · Nov 10, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 10, 2026 | No match | — |
| Washington HCA · Nov 10, 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 | 402 |
|---|---|
| Services billed | 1,003 across 26 procedure codes |
| Paid by Medicare | $92,507 |
Part D prescriptions in 2024
| Prescriptions (claims) | 3,519 · 8,092 30-day fills |
|---|---|
| Patients | 326 |
| Total drug cost | $17,921,531 |
| Generic share | 54% of claims |
Education and affiliations
| Medical school | University of Chicago, Pritzker School of Medicine |
|---|---|
| Graduation year | 2000 |
| Medicare specialty | Cardiovascular Disease (Cardiology) |
| Secondary specialties | Internal Medicine |
| Telehealth | Offers telehealth |
Medical group
- Stanford Health CareStanford, CA · 3,122 clinicians
Hospital affiliations
- Adventist Health Howard MemorialWillits, CA
- Stanford Health CareStanford, CA
- Stanford Health Care Tri-ValleyPleasanton, CA
Industry payments (Open Payments)
- 2025$39,578 · 19 payments from 5 companies
- 2024$64,859 · 37 payments from 4 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Pfizer Inc. | $13,849 | 6 |
| Alnylam Pharmaceuticals Inc. | $11,207 | 7 |
| Bridgebio Pharma, Inc. | $10,175 | 3 |
| Astrazeneca Pharmaceuticals LP | $2,737 | 2 |
| Astrazeneca Ab | $1,611 | 1 |
What the 2025 payments were for
- Consulting Fee$31,949 · 9 payments
- Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program$5,374 · 3 payments
- Travel and Lodging$1,663 · 3 payments
- Food and Beverage$592.66 · 4 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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