Xavier E. Fonseca Fuentes, MD

Medicare activity in 2024

Official CMS public-use data for Xavier E. Fonseca Fuentes, 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. Critical care, first 30-74 minutes (99291)231 services
2. Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)45 services
3. Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)38 services
4. Test to examine how well the lungs exchange gases (94729)36 services
5. Test to measure expiratory airflow and volume changes before and after medication administration (94060)31 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 cholesterol68%
• COPD51%
• Arthritis46%
• Heart failure42%
• Ischemic heart disease40%

Hospitals where Xavier E. Fonseca Fuentes works

Medicare's Facility Affiliation Data lists Xavier E. Fonseca Fuentes 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.

• Billings Clinic HospitalBillings, MT · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 270004
• Cody Regional HealthCody, WY · Critical Access Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 531312
• Sagewest Health CareRiverton, WY · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 530008

Practice locations

Addresses where Xavier E. Fonseca Fuentes is enrolled with Medicare (CMS data updated October 2, 2026).

• 801 N 29th StBillings, MT 59101 (406) 238‑2500

Group practices

Medicare enrollment lists Xavier E. Fonseca Fuentes as a member of this group (CMS data updated October 2, 2026).

• Billings Clinic Specialty Supplies and Services, LLC824 clinicians in the group

Specialties

• Pulmonary Diseaseprimary

Find other Pulmonary Disease doctors in Montana →

Other pulmonologists in Billings

Clinicians with the same Medicare primary specialty in Billings, MT — not a recommendation.

• Jamie C. Riha, MD
• Ryan Bibler, MD
• Erin S. Rains, DO
• Joanna Moore, MD
• Frederick W. Kahn, MD
• Rafael A. Arciniegas Flores, MD
• Bruno Ferreira Rodrigues, MD
• Nicholas Moore, MD

All pulmonologists in Billings →

Other clinicians in Billings Clinic Specialty Supplies and Services, LLC

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

• Timothy J. Strigenz, MD
• Sheila D. Sarmiento, PA
• John A. Billingsley, MD
• Amara L. Rickman
• Sandra J. Moe, PA
• Eric J. Saberhagen, 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