Larissa M. Allen, MD

Medicare activity in 2024

Official CMS public-use data for Larissa M. Allen, 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)221 services
2. Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)192 services
3. Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)190 services
4. Biopsy of large bowel using a flexible endoscope (45380)154 services
5. Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)141 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 pressure60%
• Arthritis45%
• Anxiety22%
• Osteoporosis22%
• Ischemic heart disease19%

Hospitals where Larissa M. Allen works

Medicare's Facility Affiliation Data lists Larissa M. Allen 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.

• Northwest Medical CenterTucson, AZ · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 030085
• Oro Valley HospitalOro Valley, AZ · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 030114

Practice locations

Addresses where Larissa M. Allen is enrolled with Medicare (CMS data updated October 2, 2026).

• 1701 W Saint Marys Rd, Suite 125Tucson, AZ 85745 (520) 742‑4139
• 7566 N La Cholla Blvd, Suite ATucson, AZ 85741 (520) 742‑4139
• 7566 N La Cholla Blvd ATucson, AZ 85741

Group practices

Medicare enrollment lists Larissa M. Allen as a member of this group (CMS data updated October 2, 2026).

• Arizona Gastroenterology Ltd8 clinicians in the group

Specialties

• Gastroenterologyprimary

Find other Gastroenterology doctors in Arizona →

Other gastroenterologists in Tucson

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

• Oleh Haluszka, MD
• John J. McNerney Jr., MD
• Edmund Krasinski Jr., DO
• Miguel Arenas, MD
• Pooja K. Lal, MD
• Murray Orbuch, MD
• Robert M. McCallum, MD
• Anas Bitar, MD

All gastroenterologists in Tucson →

Other clinicians in Arizona Gastroenterology Ltd

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

• Kavitha Waggoner, DO
• Kelly A. Green, PA
• Lisa A. Medeiros
• Scott E. Blinkoff, MD
• Guatemala D. Kimble, NP
• Bryan Contreras, 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