Ryan Anthony Vaca, M.D.
NPI 1700222148ActiveIndividual· Internal Medicine, Hematology & Oncology· Sioux Falls, SD
Internal Medicine, Hematology & Oncology (M.D.) in Sioux Falls, South Dakota, trained at Sanford School of Medicine of University of South Dakota (class of 2013). Their prescriptions cost Medicare Part D more than their services did: $1,994,953 for 1,018 claims, against $84,984 paid for services in 2024. Pfizer Inc. was the largest of 4 companies reporting payments in 2025, $100.99 in all, mostly education.
Overview
| NPI | 1700222148 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | May 13, 2013 |
| Last updated in NPPES | Sep 1, 2021 |
| Certified by provider | Sep 1, 2021 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Hematology & Oncology Primary | 207RH0003X | 12727 | SD |
| Student in an Organized Health Care Education/Training Program | 390200000X | — | — |
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 (MN); Practitioner - Medical Oncology (SD); Practitioner - Internal Medicine (WI) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 348 |
|---|---|
| Services billed | 948 across 16 procedure codes |
| Paid by Medicare | $84,984 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,018 · 1,140 30-day fills |
|---|---|
| Patients | 166 |
| Total drug cost | $1,994,953 |
| Generic share | 75% of claims |
Education and affiliations
| Medical school | Sanford School of Medicine of University of South Dakota |
|---|---|
| Graduation year | 2013 |
| Medicare specialty | Medical Oncology |
| Telehealth | Offers telehealth |
Medical groups
- Avera McKennanSioux Falls, SD · 959 clinicians
- Rural Health Care IncBrookings, SD · 154 clinicians
Hospital affiliations
- Avera Marshall Regional Medical CtrMarshall, MN
- Avera McKennan Hospital & University Health CenterSioux Falls, SD
- Avera Queen of PeaceMitchell, SD
- Avera St Mary's HospitalPierre, SD
- Osceola Community HospitalSibley, IA
Industry payments (Open Payments)
- 2025$100.99 · 5 payments from 4 companies
- 2024$22.33 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Pfizer Inc. | $52.00 | 2 |
| Azurity Pharmaceuticals, Inc. | $19.17 | 1 |
| Eisai Inc. | $15.40 | 1 |
| Jazz Pharmaceuticals Inc. | $14.42 | 1 |
What the 2025 payments were for
- Education$52.00 · 2 payments
- Food and Beverage$48.99 · 3 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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