Suisun Simon Chan, M.D.
NPI 1801815527ActiveIndividual· Internal Medicine, Gastroenterology· Monterey Park, CA
Internal Medicine, Gastroenterology (M.D.) in Monterey Park, California, trained at Icahn School of Medicine at Mount Sinai (class of 1984). Their prescriptions cost Medicare Part D more than their services did: $270,150 for 3,742 claims, against $62,682 paid for services in 2024. Phathom Pharmaceuticals, Inc. reported $105.74 in payments in 2025, mostly food and beverage.
Overview
| NPI | 1801815527 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | Yes |
| NPI issued | Jul 19, 2006 |
| Last updated in NPPES | Jul 9, 2007 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Gastroenterology Primary | 207RG0100X | A42588 | 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 - Gastroenterology (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 293 |
|---|---|
| Services billed | 605 across 13 procedure codes |
| Paid by Medicare | $62,682 |
Part D prescriptions in 2024
| Prescriptions (claims) | 3,742 · 5,187 30-day fills |
|---|---|
| Patients | 487 |
| Total drug cost | $270,150 |
| Generic share | 83% of claims |
Education and affiliations
| Medical school | Icahn School of Medicine at Mount Sinai |
|---|---|
| Graduation year | 1984 |
| Medicare specialty | Gastroenterology |
| Secondary specialties | Family Practice, Internal Medicine |
| Telehealth | Offers telehealth |
Industry payments (Open Payments)
- 2025$105.74 · 5 payments from 1 company
- 2024$120.00 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Phathom Pharmaceuticals, Inc. | $105.74 | 5 |
What the 2025 payments were for
- Food and Beverage$105.74 · 5 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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