Gregory Calderoni Ravizzini, M.D.
NPI 1649447525ActiveIndividual· Nuclear Medicine· Houston, TX
Nuclear Medicine (M.D.) with Physicians Referral Service, practicing in Houston, Texas. Medicare paid $61,905 for services to 1,418 patients in 2024. Telix Pharmaceuticals was the largest of 2 companies reporting payments in 2025, $136.62 in all, mostly food and beverage.
Overview
| NPI | 1649447525 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | May 10, 2008 |
| Last updated in NPPES | Feb 27, 2012 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Nuclear Medicine Primary | 207U00000X | P1213 | TX |
| Nuclear Medicine | 207U00000X | 238724 | NY |
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 - Nuclear Medicine (TX) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 1,418 |
|---|---|
| Services billed | 1,655 across 25 procedure codes |
| Paid by Medicare | $61,905 |
Education and affiliations
| Graduation year | 1998 |
|---|---|
| Medicare specialty | Nuclear Medicine |
| Secondary specialties | Diagnostic Radiology |
Medical group
- Physicians Referral ServiceHouston, TX · 2,765 clinicians
Industry payments (Open Payments)
- 2025$136.62 · 2 payments from 2 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Telix Pharmaceuticals | $108.90 | 1 |
| Progenics Pharmaceuticals, Inc. | $27.72 | 1 |
What the 2025 payments were for
- Food and Beverage$136.62 · 2 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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