Colleen A. Keegan, DO

Medicare activity in 2024

Official CMS public-use data for Colleen A. Keegan, 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. Destruction of precancer skin growth, 2-14 growths (17003)291 services
2. Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)280 services
3. Destruction of precancer skin growth, 1 growth (17000)155 services
4. Destruction of skin growth, 1-14 growths (17110)142 services
5. Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)133 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 cholesterol75%
• High blood pressure63%
• Arthritis44%
• Ischemic heart disease25%
• Anxiety25%
• Diabetes23%

Hospitals where Colleen A. Keegan works

Medicare's Facility Affiliation Data lists Colleen A. Keegan 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.

• Northwestern Medicine Central Dupage HospitalWinfield, IL · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 140242

Practice locations

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

• 636 Raymond DrNaperville, IL 60563 (630) 315‑6500

Group practices

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

• Central Dupage Physician Group1,080 clinicians in the group

Specialties

• Dermatologyprimary

Find other Dermatology doctors in Illinois →

Other dermatologists in Naperville

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

• James B. Grossweiner, MD
• Wayne J. Blaszak, MD
• Scott C. Blaszak, MD
• Matthew M. Scholl, MD
• Christina D. Enescu, MD
• Maria L. Espinosa, MD
• Shruthi G. Reddy, MD
• Amy P. Orsini, MD

All dermatologists in Naperville →

Other clinicians in Central Dupage Physician Group

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

• Emily A. Martillaro
• Bindi Parikh, MD
• Estefania Lopez
• Emi Sajan, MD
• Emma Concepcion I. Jose
• Laura K. Tagle, 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