Aman Chauhan, MD
NPI 1902193147ActiveIndividual· Internal Medicine, Medical Oncology· San Francisco, CA
Internal Medicine, Medical Oncology (MD) with University of Miami and 2 other groups, practicing in San Francisco, California. Their prescriptions cost Medicare Part D more than their services did: $229,844 for 161 claims, against $40,592 paid for services in 2024. Exelixis Inc. was the largest of 6 companies reporting payments in 2025, $33,351 in all, mostly consulting fees. Lists UCSF Medical Center as a hospital affiliation.
Overview
| NPI | 1902193147 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Jul 8, 2011 |
| Last updated in NPPES | Dec 4, 2025 |
| Certified by provider | Dec 4, 2025 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Medical Oncology Primary | 207RX0202X | C204071 | 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 - Hematology/Oncology (CA); Practitioner - Medical Oncology (FL); Practitioner - Medical Oncology (KY) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 122 |
|---|---|
| Services billed | 468 across 11 procedure codes |
| Paid by Medicare | $40,592 |
Part D prescriptions in 2024
| Prescriptions (claims) | 161 · 177 30-day fills |
|---|---|
| Patients | 51 |
| Total drug cost | $229,844 |
| Generic share | 84% of claims |
Education and affiliations
| Graduation year | 2010 |
|---|---|
| Medicare specialty | Medical Oncology |
| Telehealth | Offers telehealth |
Medical groups
- University of MiamiMiami, FL · 2,377 clinicians
- University of California San FranciscoSan Francisco, CA · 1,839 clinicians
- UCSF Medical Group Business ServicesSan Francisco, CA · 1,598 clinicians
Hospital affiliation
- UCSF Medical CenterSan Francisco, CA
Industry payments (Open Payments)
- 2025$33,351 · 40 payments from 6 companies
- 2024$24,934 · 32 payments from 6 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Exelixis Inc. | $13,128 | 24 |
| Boehringer Ingelheim Pharmaceuticals, Inc. | $12,021 | 5 |
| Genzyme Corporation | $4,143 | 3 |
| Tersera Therapeutics LLC | $3,541 | 3 |
| Novartis Pharmaceuticals Corporation | $311.76 | 2 |
What the 2025 payments were for
- Consulting Fee$22,369 · 7 payments
- Travel and Lodging$4,122 · 15 payments
- Compensation for serving as faculty or as a speaker for a medical education program$3,000 · 4 payments
- Honoraria$2,400 · 1 payment
- Food and Beverage$1,460 · 13 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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