Alan Ken Matsumoto, M.D.
NPI 1043219298ActiveIndividual· Internal Medicine, Rheumatology· Wheaton, MD
Internal Medicine, Rheumatology (M.D.) in Wheaton, Maryland, trained at University of Illinois College of Med (Chi/Peor/Rock/Chm-Urb) (class of 1985). In 2024 Medicare paid $3,752,966 for 1,266 patients, and Part D covered 2,372 of their prescriptions, 87% of them generic. Novartis Pharmaceuticals Corporation was the largest of 8 companies reporting payments in 2025, $17,928 in all, mostly consulting fees.
Overview
| NPI | 1043219298 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Jul 19, 2005 |
| Last updated in NPPES | Mar 11, 2021 |
| Certified by provider | Mar 11, 2021 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Rheumatology Primary | 207RR0500X | D0036867 | MD |
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) | Not in the public enrollment file of Oct 1, 2026 |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 1,266 |
|---|---|
| Services billed | 192,940 across 127 procedure codes |
| Paid by Medicare | $3,752,966 |
Part D prescriptions in 2024
| Prescriptions (claims) | 2,372 · 5,429 30-day fills |
|---|---|
| Patients | 405 |
| Total drug cost | $2,782,706 |
| Generic share | 87% of claims |
Education and affiliations
| Medical school | University of Illinois College of Med (Chi/Peor/Rock/Chm-Urb) |
|---|---|
| Graduation year | 1985 |
| Medicare specialty | Rheumatology |
| Secondary specialties | Internal Medicine |
| Telehealth | Offers telehealth |
Medical group
- Suburban/Nrh Medical Rehabilitation IncBethesda, MD · 941 clinicians
Industry payments (Open Payments)
- 2025$17,928 · 120 payments from 8 companies
- 2024$27,615 · 95 payments from 6 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Novartis Pharmaceuticals Corporation | $5,564 | 36 |
| Janssen Scientific Affairs, LLC | $5,495 | 36 |
| Pfizer Inc. | $4,814 | 16 |
| Genentech, Inc. | $1,149 | 19 |
| Abbvie Inc. | $580.52 | 8 |
What the 2025 payments were for
- Consulting Fee$5,235 · 6 payments
- Travel and Lodging$4,527 · 37 payments
- Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program$4,093 · 4 payments
- Honoraria$3,207 · 4 payments
- Food and Beverage$766.91 · 68 payments
- Education$99.00 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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