Andrew T. Chan, M.D.
NPI 1982600144ActiveIndividual· Internal Medicine, Gastroenterology· Boston, MA
Internal Medicine, Gastroenterology (M.D.) in Boston, Massachusetts, trained at Harvard Medical School (class of 1997). 131 Medicare patients in 2024, $23,319 paid; nearly all of their 96 Part D prescriptions were generic (90%). Pfizer Inc. was the largest of 2 companies reporting payments in 2025, $9,537 in all, mostly consulting fees.
Overview
| NPI | 1982600144 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Jun 22, 2005 |
| Last updated in NPPES | Aug 4, 2010 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Gastroenterology Primary | 207RG0100X | 210410 | MA |
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 - Gastroenterology (MA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 131 |
|---|---|
| Services billed | 250 across 24 procedure codes |
| Paid by Medicare | $23,319 |
Part D prescriptions in 2024
| Prescriptions (claims) | 96 · 118 30-day fills |
|---|---|
| Patients | 85 |
| Total drug cost | $18,788 |
| Generic share | 90% of claims |
Education and affiliations
| Medical school | Harvard Medical School |
|---|---|
| Graduation year | 1997 |
| Medicare specialty | Gastroenterology |
| Secondary specialties | Internal Medicine |
| Telehealth | Offers telehealth |
Medical groups
- Massachusetts General Physicians Organization IncBoston, MA · 3,558 clinicians
- The General Hospital CorporationBoston, MA · 1,267 clinicians
- Mass General Brigham Medical Group Northern Massachusetts IncDanvers, MA · 827 clinicians
- Mass General Brigham Community Physicians IncWatertown, MA · 428 clinicians
Hospital affiliations
- Holy Family HospitalMethuen, MA
- Massachusetts General HospitalBoston, MA
- North Shore Medical Center -Salem, MA
Industry payments (Open Payments)
- 2025$9,537 · 5 payments from 2 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Pfizer Inc. | $8,800 | 4 |
| Beigene, Ltd. | $736.67 | 1 |
What the 2025 payments were for
- Consulting Fee$9,537 · 5 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other Internal Medicine, Gastroenterology providers in Boston
- 1730505298
- 1386019503
- 1710523147
- 1376201038
- 1629189014
- 1194366849
- 1225078801
- 1013237809
- 1003169327
- 1740213990
- 1811988488
- 1619395795
All Internal Medicine, Gastroenterology providers in Massachusetts →