Marvin Ryou, M.D.
NPI 1821104787ActiveIndividual· Internal Medicine, Gastroenterology· Boston, MA
Internal Medicine, Gastroenterology (M.D.) in Boston, Massachusetts, trained at Harvard Medical School (class of 2003). Mostly services rather than prescriptions: Medicare paid $70,270 for 272 patients in 2024, with only 15 Part D claims. Olympus America Inc. was the largest of 9 companies reporting payments in 2025, $38,792 in all, mostly consulting fees.
Overview
| NPI | 1821104787 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Aug 22, 2006 |
| Last updated in NPPES | Jul 19, 2012 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Gastroenterology Primary | 207RG0100X | 225849 | MA |
| Internal Medicine | 207R00000X | 225849 | 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 | 272 |
|---|---|
| Services billed | 550 across 62 procedure codes |
| Paid by Medicare | $70,270 |
Part D prescriptions in 2024
| Prescriptions (claims) | 15 · 19 30-day fills |
|---|---|
| Patients | 15 |
| Total drug cost | $776.96 |
| Generic share | 100% of claims |
Education and affiliations
| Medical school | Harvard Medical School |
|---|---|
| Graduation year | 2003 |
| Medicare specialty | Gastroenterology |
Medical groups
- Massachusetts General Physicians Organization IncBoston, MA · 3,558 clinicians
- Brigham and Womens Physicians Organization IncBoston, MA · 2,994 clinicians
- Emerson Practice Associates, IncConcord, MA · 240 clinicians
Hospital affiliations
- Brigham and Women Faulkner HospitalJamaica Plain, MA
- Brigham and Women's HospitalBoston, MA
- Emerson Hospital -W Concord, MA
- Massachusetts General HospitalBoston, MA
- South Shore HospitalSouth Weymouth, MA
Industry payments (Open Payments)
- 2025$38,792 · 54 payments from 9 companies
- 2024$22,787 · 38 payments from 7 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Olympus America Inc. | $22,562 | 18 |
| Olympus Corporation of the Americas | $8,632 | 13 |
| Fujifilm Healthcare Americas Corporation | $3,954 | 11 |
| Olympus Medical Systems Corporation | $1,891 | 3 |
| Olympus Corporation | $1,005 | 1 |
What the 2025 payments were for
- Consulting Fee$28,133 · 17 payments
- Education$7,370 · 3 payments
- Food and Beverage$1,979 · 24 payments
- Travel and Lodging$1,310 · 10 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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