Roy F. Chemaly, M.D.
NPI 1609976521ActiveIndividual· Internal Medicine, Infectious Disease· Houston, TX
Internal Medicine, Infectious Disease (M.D.) with Physicians Referral Service, practicing in Houston, Texas. Mostly services rather than prescriptions: Medicare paid $8,883 for 66 patients in 2024, with only 40 Part D claims. Merck Sharp & Dohme LLC was the largest of 6 companies reporting payments in 2025, $132,769 in all, mostly travel and lodging.
Overview
| NPI | 1609976521 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Sep 22, 2006 |
| Last updated in NPPES | Jun 15, 2012 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Infectious Disease Primary | 207RI0200X | L5275 | TX |
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 - Infectious Disease (TX) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 66 |
|---|---|
| Services billed | 89 across 10 procedure codes |
| Paid by Medicare | $8,883 |
Part D prescriptions in 2024
| Prescriptions (claims) | 40 · 63 30-day fills |
|---|---|
| Total drug cost | $1,769 |
| Generic share | 100% of claims |
Education and affiliations
| Graduation year | 1992 |
|---|---|
| Medicare specialty | Infectious Disease |
| Secondary specialties | Internal Medicine |
Medical group
- Physicians Referral ServiceHouston, TX · 2,765 clinicians
Industry payments (Open Payments)
- 2025$132,769 · 50 payments from 6 companies
- 2024$60,026 · 44 payments from 8 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Merck Sharp & Dohme LLC | $93,155 | 27 |
| Biotest Ag | $15,295 | 5 |
| Shionogi Inc | $10,046 | 6 |
| Invivyd Inc | $7,048 | 4 |
| Pierre Fabre Pharmaceuticals, Inc. | $4,726 | 6 |
What the 2025 payments were for
- Travel and Lodging$61,741 · 27 payments
- Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program$47,470 · 8 payments
- Consulting Fee$19,445 · 7 payments
- Honoraria$3,750 · 1 payment
- Food and Beverage$363.64 · 7 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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