Joshua R. Niska, MD

Medicare activity in 2024

Official CMS public-use data for Joshua R. Niska, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.

Most frequent services

1. Ct guidance for insertion of radiation therapy fields (77014)423 services
2. Stereoscopic x-ray guidance for localization of target volume for the delivery of radiation therapy (G6002)323 services
3. Calculation of radiation therapy dose (77300)199 services
4. Radiation treatment management, 5 treatment sessions (77427)148 services
5. Prolonged office or other outpatient evaluation and management service(s) beyond the maximum required time of the primary procedure which has been selected using total time on the date of the primary service; each additional 15 minutes by the physician or (G2212)134 services

Chronic conditions among these patients

Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).

• High cholesterol75%
• Cancer (breast, colorectal, lung, prostate, endometrial or leukemia/lymphoma)75%
• High blood pressure73%
• Arthritis38%
• Ischemic heart disease35%
• Diabetes23%

Hospitals where Joshua R. Niska works

Medicare's Facility Affiliation Data lists Joshua R. Niska at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.

• Mayo Clinic HospitalPhoenix, AZ · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 030103

Practice locations

Addresses where Joshua R. Niska is enrolled with Medicare (CMS data updated October 2, 2026).

• 13400 E Shea BlvdScottsdale, AZ 85259 (480) 301‑8000

Group practices

Medicare enrollment lists Joshua R. Niska as a member of this group (CMS data updated October 2, 2026).

• Mayo Clinic Arizona1,626 clinicians in the group

Specialties

• Radiation Oncologyprimary

Find other Radiation Oncology doctors in Arizona →

Other radiation oncologists in Scottsdale

Clinicians with the same Medicare primary specialty in Scottsdale, AZ — not a recommendation.

• Elizabeth B. Jeans, MD
• Terence T. Sio, MD
• Chi Zhang, MD
• Scott P. Tannehill, MD
• Nelly Tan, MD
• Daniel R. Reed, DO
• Anushka H. Patel, MD
• Gregory A. Maggass, MD

All radiation oncologists in Scottsdale →

Other clinicians in Mayo Clinic Arizona

Medicare enrollment lists these clinicians in the same group practice — not a recommendation.

• John K. Dibaise, MD
• Tina H. Byun, MD
• Paru S. David, MD
• Nirvikar Dahiya, MD
• Juliana M. Kling, MD
• Lynae C. Floyd, PT

Clinician information

Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.

Sources

1. Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
2. Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
3. National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
4. Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
5. NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
6. Medicare Care Compare — official Medicare tool to look up clinicians