William R. Foster, MD

Medicare activity in 2024

Official CMS public-use data for William R. Foster, 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. Anesthesia for other procedure on esophagus, stomach, or upper small bowel using an endoscope (00731)27 services
2. Anesthesia for other procedure on large bowel using an endoscope (00811)18 services
3. Injection of anesthetic agent and/or steroid into thigh nerve (femoral nerve) (64447)16 services
4. Anesthesia for exam of colon using an endoscope (00812)12 services
5. Injection of anesthetic agent and/or steroid into arm nerve bundle (brachial plexus) (64415)11 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%
• Arthritis57%
• Depression35%
• Diabetes30%
• Ischemic heart disease29%

Hospitals where William R. Foster works

Medicare's Facility Affiliation Data lists William R. Foster 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.

• Tucson Medical CenterTucson, AZ · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 030006

Practice locations

Addresses where William R. Foster is enrolled with Medicare (CMS data updated October 2, 2026).

• 5301 E Grant RdTucson, AZ 85712 (469) 340‑1366
• 6200 N La Cholla BlvdTucson, AZ 85741 (520) 229‑2657

Group practices

Medicare enrollment lists William R. Foster as a member of these groups (CMS data updated October 2, 2026).

• Northwest HBP Medical Services LLC284 clinicians in the group
• Ias Arizona PLLC114 clinicians in the group

Specialties

• Anesthesiologyprimary

Find other Anesthesiology doctors in Arizona →

Other anesthesiologists in Tucson

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

• Samata R. Paidy, MD
• David Sheinbein, MD
• Rabail Chaudhry, MD
• Michael Louthan, MD
• Scott Tonder, MD
• Anindita Das, MD
• Elizabeth Sigler, DO
• William Pekarske, MD

All anesthesiologists in Tucson →

Other clinicians in Northwest HBP Medical Services LLC

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

• Kamau Gitau, CNA
• Adria E. Ottoboni, MD
• Shalako Bradley, DO
• John Ortiz, NP
• Kimball C. Kaufman, DO
• John Reagan D. Mendoza, 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