Mary Clare C. McGregor, MD

Medicare activity in 2024

Official CMS public-use data for Mary Clare C. McGregor, 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)58 services
2. Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)57 services
3. Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)31 services
4. Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)30 services
5. Test to measure expiratory airflow and volume (94010)29 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 cholesterol74%
• Arthritis51%
• COPD50%
• Chronic kidney disease45%
• Ischemic heart disease43%

Hospitals where Mary Clare C. McGregor works

Medicare's Facility Affiliation Data lists Mary Clare C. McGregor 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.

• Barnes Jewish HospitalSaint Louis, MO · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 260032
• Memorial HospitalBelleville, IL · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 140185

Practice locations

Addresses where Mary Clare C. McGregor is enrolled with Medicare (CMS data updated October 2, 2026).

• 1 Barnes Jew Hosp PlzSaint Louis, MO 63110 (314) 747‑3000
• 4921 Parkview PlSaint Louis, MO 63110

Group practices

Medicare enrollment lists Mary Clare C. McGregor as a member of this group (CMS data updated October 2, 2026).

• Washington University3,029 clinicians in the group

Specialties

• Pulmonary Diseaseprimary
• Critical Care (Intensivists)also
• Internal Medicinealso

Find other Pulmonary Disease doctors in Missouri →

Other pulmonologists in Saint Louis

Clinicians with the same Medicare primary specialty in Saint Louis, MO — not a recommendation.

• John K. Mwangi, MD
• Tracy L. Ivy, MD
• Nguyet M. Nguyen, MD
• Bryan D. Kraft, MD
• Laneshia K. Tague, MD
• Shail B. Mehta, MD
• Aaron S. Case, MD
• Daniel J. Reynolds, MD

All pulmonologists in Saint Louis →

Other clinicians in Washington University

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

• Megan B. Moseley, PA
• Amber R. Leis
• Anton Garazha, MD
• Kathleen G. Bickel, MD
• John E. Rouck, MD
• Nicholas A. Pallotta, 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