David Sommerhalder
NPI 1821417270ActiveIndividual· Internal Medicine, Hematology & Oncology· San Antonio, TX
Internal Medicine, Hematology & Oncology with Texas Oncology PA, practicing in San Antonio, Texas. Their prescriptions cost Medicare Part D more than their services did: $804,589 for 649 claims, against $262,688 paid for services in 2024. Siemens Medical Solutions USA, Inc. was the largest of 25 companies reporting payments in 2025, $1,924 in all, mostly food and beverage. Lists Methodist Hospital as a hospital affiliation.
Overview
| NPI | 1821417270 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Sole proprietor | Yes |
| NPI issued | Apr 14, 2014 |
| Last updated in NPPES | Dec 13, 2021 |
| Certified by provider | Dec 13, 2021 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Hematology & Oncology Primary | 207RH0003X | S5270 | TX |
| Student in an Organized Health Care Education/Training Program | 390200000X | — | — |
| Internal Medicine | 207R00000X | S5270 | TN |
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 - Hematology/Oncology (TX) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 124 |
|---|---|
| Services billed | 24,736 across 56 procedure codes |
| Paid by Medicare | $262,688 |
Part D prescriptions in 2024
| Prescriptions (claims) | 649 · 821 30-day fills |
|---|---|
| Patients | 82 |
| Total drug cost | $804,589 |
| Generic share | 78% of claims |
Education and affiliations
| Graduation year | 2013 |
|---|---|
| Medicare specialty | Hematology/Oncology |
| Secondary specialties | Internal Medicine, Medical Oncology |
| Telehealth | Offers telehealth |
Medical group
- Texas Oncology PAPlano, TX · 1,014 clinicians
Hospital affiliation
- Methodist HospitalSan Antonio, TX
Industry payments (Open Payments)
- 2025$1,924 · 57 payments from 25 companies
- 2024$2,927 · 89 payments from 34 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Siemens Medical Solutions USA, Inc. | $460.00 | 1 |
| Novartis Pharmaceuticals Corporation | $192.51 | 9 |
| Caris Mpi, Inc. | $137.41 | 1 |
| Abbvie Inc. | $124.51 | 5 |
| Regeneron Healthcare Solutions, Inc. | $124.27 | 1 |
What the 2025 payments were for
- Food and Beverage$1,364 · 55 payments
- Consulting Fee$460.00 · 1 payment
- Education$99.99 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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