Dennis S. Riff, MD

Medicare activity in 2024

Official CMS public-use data for Dennis S. Riff, 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. Injection, inclisiran, 1 mg (J1306)5,112 services
2. Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)195 services
3. Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)170 services
4. Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)114 services
5. New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)69 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 blood pressure75%
• High cholesterol75%
• Arthritis51%
• Diabetes46%
• Depression41%
• Chronic kidney disease41%

Hospitals where Dennis S. Riff works

Medicare's Facility Affiliation Data lists Dennis S. Riff 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.

• AHMC Anaheim Regional Medical CenterAnaheim, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050226
• UCI Health-OrangeOrange, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050348

Practice locations

Addresses where Dennis S. Riff is enrolled with Medicare (CMS data updated October 2, 2026).

• 1211 W La Palma Ave, Suite 306Anaheim, CA 92801 (714) 778‑1300

Group practices

Medicare enrollment lists Dennis S. Riff as a member of this group (CMS data updated October 2, 2026).

• Associated Gastroenterology Medical Group6 clinicians in the group

Specialties

• Gastroenterologyprimary
• Internal Medicinealso

Find other Gastroenterology doctors in California →

Other gastroenterologists in Anaheim

Clinicians with the same Medicare primary specialty in Anaheim, CA — not a recommendation.

• Jason S. Yip, MD
• Yun Wang, MD
• Ambika Bali, MD
• Kevin D. Kuettel, MD
• Erica St Lawrence, MD
• Brian P. Riff, MD
• Dick M. Yip, MD
• Amit Bhanvadia, MD

All gastroenterologists in Anaheim →

Other clinicians in Associated Gastroenterology Medical Group

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

• Kevin D. Kuettel, MD
• Kavita Singh, MD
• Brian P. Riff, MD
• Hailey M. Garrison, PA

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