Sing Chan, M.D.
NPI 1225053523ActiveIndividual· Internal Medicine, Gastroenterology· Flushing, NY
Internal Medicine, Gastroenterology (M.D.) in Flushing, New York, trained at State University of New York Downstate Medical Center (class of 1991). Their prescriptions cost Medicare Part D more than their services did: $2,986,253 for 5,650 claims, against $169,654 paid for services in 2024. Gilead Sciences, Inc. was the largest of 15 companies reporting payments in 2025, $2,807 in all, mostly food and beverage.
Overview
| NPI | 1225053523 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | Yes |
| NPI issued | Jul 13, 2006 |
| Last updated in NPPES | Sep 18, 2018 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Gastroenterology Primary | 207RG0100X | 192380 | NY |
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 (NY) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 302 |
|---|---|
| Services billed | 1,216 across 36 procedure codes |
| Paid by Medicare | $169,654 |
Part D prescriptions in 2024
| Prescriptions (claims) | 5,650 · 6,439 30-day fills |
|---|---|
| Patients | 1,274 |
| Total drug cost | $2,986,253 |
| Generic share | 72% of claims |
Education and affiliations
| Medical school | State University of New York Downstate Medical Center |
|---|---|
| Graduation year | 1991 |
| Medicare specialty | Gastroenterology |
| Secondary specialties | Internal Medicine |
| Telehealth | Offers telehealth |
Medical group
- Dreamwork Medical, PLLCFlushing, NY · 2 clinicians
Industry payments (Open Payments)
- 2025$2,807 · 128 payments from 15 companies
- 2024$1,993 · 102 payments from 16 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Gilead Sciences, Inc. | $440.21 | 18 |
| Ardelyx, Inc. | $307.42 | 11 |
| Abbvie Inc. | $262.12 | 15 |
| Intra-Sana Laboratories | $259.09 | 13 |
| Madrigal Pharmaceuticals | $240.32 | 11 |
What the 2025 payments were for
- Food and Beverage$2,807 · 128 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 64 gastroenterologists in Flushing · All gastroenterologists in New York