Ernie Riffer, MD

Medicare activity in 2024

Official CMS public-use data for Ernie Riffer, 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. Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)264 services
2. Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit (G0439)233 services
3. Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)226 services
4. Administration of influenza virus vaccine (G0008)58 services
5. Influenza vaccine, inactivated (90653)44 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%
• High blood pressure71%
• Arthritis46%
• Ischemic heart disease27%
• Diabetes26%
• Chronic kidney disease25%

Hospitals where Ernie Riffer works

Medicare's Facility Affiliation Data lists Ernie Riffer 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.

• Honor Health John C. Lincoln Medical CenterPhoenix, AZ · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 030014
• St Josephs Hospital and Medical CenterPhoenix, AZ · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 030024

Practice locations

Addresses where Ernie Riffer is enrolled with Medicare (CMS data updated October 2, 2026).

• 7600 N 15th St, Suite 190Phoenix, AZ 85020 (702) 480‑2550

Group practices

Medicare enrollment lists Ernie Riffer as a member of this group (CMS data updated October 2, 2026).

• Greater Phoenix Collaborative Care PC107 clinicians in the group

Specialties

• Internal Medicineprimary

Find other Internal Medicine doctors in Arizona →

Other internal medicine doctors in Phoenix

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

• Neda Azizian, MD
• Haris H. Chaudhry, MD
• Farmin Samareh-Jahani, MD
• Sandra K. Yuh, MD
• Meily R. Arevalo, MD
• David W. Quick, DO
• Alfredo L. Lim, MD
• Shreya S. Amin, MD

All internal medicine doctors in Phoenix →

Other clinicians in Greater Phoenix Collaborative Care PC

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

• Neda Azizian, MD
• Brooke A. Popelas, DO
• Steven C. Macko, MD
• Rajesh U. Bhakta, MD
• Ana Maria Burger, NP
• Philip C. Kaczar, MD

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