Alexandra H. Leon Guerrero

Medicare activity in 2024

Official CMS public-use data for Alexandra H. Leon Guerrero, 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)117 services
2. New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)49 services
3. Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)35 services
4. Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)33 services
5. Colorectal cancer screening; colonoscopy on individual not meeting criteria for high risk (G0121)18 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%
• Diabetes55%
• Arthritis34%
• Chronic kidney disease30%
• Ischemic heart disease27%

Hospitals where Alexandra H. Leon Guerrero works

Medicare's Facility Affiliation Data lists Alexandra H. Leon Guerrero 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.

• Guam Memorial Hospital AuthorityTamuning, GU · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 650001
• Guam Regional Medical CityDededo, GU · Acute Care Hospital · Emergency services: listed by Medicare · CCN 650003

Practice locations

Addresses where Alexandra H. Leon Guerrero is enrolled with Medicare (CMS data updated October 2, 2026).

• 133 Route 3Dededo, GU 96929 (671) 645‑5500
• 280 Pale San Vitores RdTamuning, GU 96913 (671) 647‑4542

Group practices

Medicare enrollment lists Alexandra H. Leon Guerrero as a member of these groups (CMS data updated October 2, 2026).

• Guam Healthcare Development Incorporated207 clinicians in the group
• Hafa Specialist Group LLP7 clinicians in the group

Specialties

• General Surgeryprimary

Find other General Surgery doctors in Guam →

Other general surgeons in Dededo

Clinicians with the same Medicare primary specialty in Dededo, GU — not a recommendation.

• Ryan Carver, MD
• Ricardo B. Eusebio, MD
• Michael W. Cruz, MD
• Christian A. Eusebio, MD
• John Reinier Narvaez, MD
• Daniel C. Medina, MD

All general surgeons in Dededo →

Other clinicians in Guam Healthcare Development Incorporated

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

• Semjon Tsyrlin, MD
• Wasin Ahuja, MD
• Andrew D. Healey, DO
• Teofila Maria P. Cruz, NP
• Linfei Yu, NP
• Joel M. Rubio, 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