Dean G. Karahalios, MD

Medicare activity in 2024

Official CMS public-use data for Dean G. Karahalios, 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)70 services
2. New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)44 services
3. Partial removal of spine bone with release of spinal cord and/or nerves, each additional segment (63048)23 services
4. Computer-assisted spinal procedure (61783)19 services
5. Insertion of cage or mesh device to spine bone and disc space during spine fusion (22853)17 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%
• Arthritis75%
• Ischemic heart disease39%
• Diabetes37%
• Depression35%

Hospitals where Dean G. Karahalios works

Medicare's Facility Affiliation Data lists Dean G. Karahalios 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.

• Advocate Good Samaritan HospitalDowners Grove, IL · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 140288
• Mayo Clinic HospitalPhoenix, AZ · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 030103

Practice locations

Addresses where Dean G. Karahalios is enrolled with Medicare (CMS data updated October 2, 2026).

• 1700 Luther LnPark Ridge, IL 60068
• 214 McHenry RdBuffalo Grove, IL 60089 (847) 459‑1160
• 3551 Highland AveDowners Grove, IL 60515 (844) 376‑3876
• 3551 Highland Ave, Suite 200aDowners Grove, IL 60515 (844) 376‑3876
• 3815 Highland AveDowners Grove, IL 60515

Group practices

Medicare enrollment lists Dean G. Karahalios as a member of this group (CMS data updated October 2, 2026).

• Advocate Health and Hospitals Corporation3,118 clinicians in the group

Specialties

• Neurosurgeryprimary

Find other Neurosurgery doctors in Illinois →

Other neurosurgeons in Park Ridge

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

• Zayed Almadidy, MD
• Demetrius K. Lopes, MD
• George K. Bovis, MD
• Joshua T. Billingsley, MD
• Daphne Li, MD
• John Ruge, MD
• Patrick Sugrue, MD

All neurosurgeons in Park Ridge →

Other clinicians in Advocate Health and Hospitals Corporation

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

• Zachary P. Lamaster, DO
• Ryan P. Holehan, PT
• Hayden Flores
• M T. Sheikh, MD
• Hayley Demario, NP
• Marwan Baghdan, 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