Kathleen A. Mahan, MD

Medicare activity in 2024

Official CMS public-use data for Kathleen A. Mahan, 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 moderate level of decision making, if using time, 30 minutes or more (99214)198 services
2. Insertion of needle into vein for collection of blood sample (36415)178 services
3. Visit complexity inherent to evaluation and management associated with medical care services that serve as the continuing focal point for all needed health care services and/or with medical care services that are part of ongoing care related to a patient's (G2211)119 services
4. Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit (G0439)109 services
5. Blood test, lipids (cholesterol and triglycerides) (80061)105 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 cholesterol70%
• High blood pressure62%
• Arthritis39%
• Diabetes24%
• Depression23%
• Anxiety21%

Hospitals where Kathleen A. Mahan works

Medicare's Facility Affiliation Data lists Kathleen A. Mahan 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.

• Elmhurst Memorial HospitalElmhurst, IL · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 140200

Practice locations

Addresses where Kathleen A. Mahan is enrolled with Medicare (CMS data updated October 2, 2026).

• 1801 S Highland AveLombard, IL 60148 (630) 627‑4722

Group practices

Medicare enrollment lists Kathleen A. Mahan as a member of this group (CMS data updated October 2, 2026).

• Dupage Medical Group Ltd1,322 clinicians in the group

Specialties

• Internal Medicineprimary
• Pediatric Medicinealso

Find other Internal Medicine doctors in Illinois →

Other internal medicine doctors in Lombard

Clinicians with the same Medicare primary specialty in Lombard, IL — not a recommendation.

• Arshea Siddiqui, MD
• Shahaab Uddin, MD
• Ninel Kandel, MD
• Rizwan Mahmood, MD
• Tahir Mahmood, MD
• Mary Francine Chua, MD
• Joseph S. Kaliski, MD
• Nasser A. Boshra, MD

All internal medicine doctors in Lombard →

Other clinicians in Dupage Medical Group Ltd

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

• Neel K. Pancholi, MD
• Scott Ellis, PT
• Kathlen Mmae De Asis
• Traci Walters, PA
• Alejandra L. Alonso Hernandez
• Nathaniel P. Zarembski

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