Siamak Tabib, M.D.
NPI 1063555845ActiveIndividual· Internal Medicine, Gastroenterology· Los Angeles, CA
Internal Medicine, Gastroenterology (M.D.) in Los Angeles, California, trained at University of California, Geffen School of Medicine (class of 1997). Their prescriptions cost Medicare Part D more than their services did: $202,427 for 588 claims, against $63,915 paid for services in 2024. Janssen Biotech, Inc. was the largest of 12 companies reporting payments in 2025, $1,056 in all, mostly food and beverage.
Overview
| NPI | 1063555845 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Feb 14, 2007 |
| Last updated in NPPES | Dec 27, 2012 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Gastroenterology Primary | 207RG0100X | A66169 | 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 - Gastroenterology (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 206 |
|---|---|
| Services billed | 651 across 16 procedure codes |
| Paid by Medicare | $63,915 |
Part D prescriptions in 2024
| Prescriptions (claims) | 588 · 1,025 30-day fills |
|---|---|
| Patients | 157 |
| Total drug cost | $202,427 |
| Generic share | 84% of claims |
Education and affiliations
| Medical school | University of California, Geffen School of Medicine |
|---|---|
| Graduation year | 1997 |
| Medicare specialty | Gastroenterology |
Hospital affiliation
- Cedars-Sinai Medical CenterLos Angeles, CA
Industry payments (Open Payments)
- 2025$1,056 · 36 payments from 12 companies
- 2024$1,081 · 48 payments from 15 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Janssen Biotech, Inc. | $361.59 | 8 |
| Abbvie Inc. | $170.76 | 7 |
| Aimmune Therapeutics, Inc. | $109.55 | 4 |
| Takeda Pharmaceuticals U.S.A., Inc. | $98.87 | 4 |
| Edwards Lifesciences Corporation | $68.16 | 2 |
What the 2025 payments were for
- Food and Beverage$972.17 · 35 payments
- Education$84.00 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 252 gastroenterologists in Los Angeles · All gastroenterologists in California