Joshua Ryan Niska, MD
NPI 1811307333ActiveIndividual· Radiology, Radiation Oncology· Phoenix, AZ
Radiology, Radiation Oncology (MD) in Phoenix, Arizona, trained at Harvard Medical School (class of 2014). Mostly services rather than prescriptions: Medicare paid $120,063 for 280 patients in 2024, with only 16 Part D claims. Gt Medical Technologies, Inc was the largest of 7 companies reporting payments in 2025, $4,272 in all, mostly food and beverage.
Overview
| NPI | 1811307333 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | May 6, 2014 |
| Last updated in NPPES | Sep 17, 2024 |
| Certified by provider | Sep 17, 2024 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Radiology, Radiation Oncology Primary | 2085R0001X | 50869 | AZ |
| Student in an Organized Health Care Education/Training Program | 390200000X | 50869 | AZ |
| Student in an Organized Health Care Education/Training Program | 390200000X | — | — |
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 - Radiation Oncology (AZ) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 280 |
|---|---|
| Services billed | 1,820 across 34 procedure codes |
| Paid by Medicare | $120,063 |
Part D prescriptions in 2024
| Prescriptions (claims) | 16 · 24 30-day fills |
|---|---|
| Patients | 12 |
| Total drug cost | $328.40 |
| Generic share | 100% of claims |
Education and affiliations
| Medical school | Harvard Medical School |
|---|---|
| Graduation year | 2014 |
| Medicare specialty | Radiation Oncology |
| Telehealth | Offers telehealth |
Medical group
- Mayo Clinic ArizonaScottsdale, AZ · 1,626 clinicians
Hospital affiliation
- Mayo Clinic HospitalPhoenix, AZ
Industry payments (Open Payments)
- 2025$4,272 · 29 payments from 7 companies
- 2024$1,559 · 11 payments from 7 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Gt Medical Technologies, Inc | $1,772 | 6 |
| Elekta, Inc. | $1,199 | 9 |
| Bioprotect Medical, Inc. | $847.86 | 8 |
| Teleflex LLC | $197.89 | 2 |
| Astrazeneca Pharmaceuticals LP | $128.04 | 1 |
What the 2025 payments were for
- Food and Beverage$2,443 · 26 payments
- Travel and Lodging$1,829 · 3 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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