Ian S. Hagemann, MD

Medicare activity in 2024

Official CMS public-use data for Ian S. Hagemann, 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. Pathology examination of tissue using a microscope, intermediate complexity (88305)162 services
2. Pathology examination of tissue using a microscope, moderately high complexity (88307)134 services
3. Special stained specimen slides to examine tissue, each additional procedure (88341)102 services
4. Microscopic genetic analysis of tumor, manual (88360)99 services
5. Special stained specimen slides to examine tissue, initial procedure (88342)78 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 pressure74%
• High cholesterol72%
• Cancer (breast, colorectal, lung, prostate, endometrial or leukemia/lymphoma)54%
• Arthritis49%
• Anxiety30%
• Depression27%

Hospitals where Ian S. Hagemann works

Medicare's Facility Affiliation Data lists Ian S. Hagemann 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
• Missouri Baptist Medical CenterSaint Louis, MO · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 260108

Practice locations

Addresses where Ian S. Hagemann is enrolled with Medicare (CMS data updated October 2, 2026).

• 1 Barnes Jewish Hospital Plz, Fl 3Saint Louis, MO 63110 (314) 362‑5641

Group practices

Medicare enrollment lists Ian S. Hagemann as a member of this group (CMS data updated October 2, 2026).

• Washington University3,029 clinicians in the group

Specialties

• Pathologyprimary

Find other Pathology doctors in Missouri →

Other pathologists in Saint Louis

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

• Nima Mosammaparast
• Sonika M. Dahiya, MD
• Emily S. Reisenbichler, MD
• Frederick Wreford Iii, MD
• Kathleen Byrnes, MD
• Evelyn R. Banks, MD
• Elise L. Krejci, MD
• Miguel A. Guzman, MD

All pathologists in Saint Louis →

Other clinicians in Washington University

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

• Alec Szlachta-Mcginn, MD
• Nikhil Mogalapalli, MD
• Jennifer L. Ledbetter, NP
• Bridgette B. Svancarek, MD
• Stephanie M. Dribben
• Dayna S. Early, 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