Theodoros Voloyiannis, M.D.
NPI 1891911228ActiveIndividual· Colon & Rectal Surgery· Houston, TX
Colon & Rectal Surgery (M.D.) with Texas Oncology PA, practicing in Houston, Texas. In 2024 Medicare paid $121,044 for 161 patients, and Part D covered 441 of their prescriptions, 86% of them generic. Conmed Corporation was the largest of 10 companies reporting payments in 2025, $5,780 in all, mostly travel and lodging. Lists HCA Houston Healthcare Clear Lake as a hospital affiliation.
Overview
| NPI | 1891911228 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Apr 17, 2007 |
| Last updated in NPPES | Apr 15, 2019 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Colon & Rectal Surgery Primary | 208C00000X | M2858 | TX |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Nov 10, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 11, 2026 | No match | — |
| New York OMIG · Nov 11, 2026 | No match | — |
| Ohio Medicaid · Nov 11, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 11, 2026 | No match | — |
| Washington HCA · Nov 11, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Colorectal Surgery (Proctology) (TX) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 161 |
|---|---|
| Services billed | 681 across 112 procedure codes |
| Paid by Medicare | $121,044 |
Part D prescriptions in 2024
| Prescriptions (claims) | 441 · 441 30-day fills |
|---|---|
| Patients | 165 |
| Total drug cost | $17,870 |
| Generic share | 86% of claims |
Education and affiliations
| Graduation year | 1998 |
|---|---|
| Medicare specialty | Colorectal Surgery (Proctology) |
| Secondary specialties | General Surgery |
Medical group
- Texas Oncology PAPlano, TX · 1,014 clinicians
Hospital affiliation
- HCA Houston Healthcare Clear LakeWebster, TX
Other facilities
- Enhabit Home HealthHome health agency · Pasadena, TX
Industry payments (Open Payments)
- 2025$5,780 · 37 payments from 10 companies
- 2024$32,644 · 24 payments from 6 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Conmed Corporation | $1,625 | 1 |
| Ethicon Inc. | $1,395 | 5 |
| Pfizer Inc. | $1,056 | 2 |
| Intuitive Surgical, Inc. | $746.16 | 9 |
| Medtronic, Inc. | $327.50 | 7 |
What the 2025 payments were for
- Travel and Lodging$1,831 · 9 payments
- Consulting Fee$1,625 · 1 payment
- Food and Beverage$1,324 · 26 payments
- Honoraria$1,000 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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