Quick answers
- Does Thomas J. Ahearn accept Medicare assignment?
- Yes. Medicare's clinician data says Thomas J. Ahearn accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Thomas J. Ahearn see?
- In 2024, CMS data shows 188 Original Medicare patients and 236 services for Thomas J. Ahearn. This counts Original Medicare only and measures volume, not quality.
- What is Thomas J. Ahearn's NPI number?
- 1962872200. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Thomas J. Ahearn, 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.
| Original Medicare patients | 188 |
|---|---|
| Services billed to Medicare | 236 |
| Different services or procedures | 25 |
| Participating Medicare provider | Yes |
| Average age of these patients | 75 |
Most frequent services
- Emergency department visit with moderate level of medical decision making (99284)94 services
- Emergency department visit with high level of medical decision making (99285)73 services
- Emergency department visit with low level of medical decision making (99283)15 services
- Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only (93010)13 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 pressure74%
- Arthritis61%
- Ischemic heart disease30%
- Diabetes29%
- Depression28%
Hospitals where Thomas J. Ahearn works
Medicare's Facility Affiliation Data lists Thomas J. Ahearn 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.
- Hoag Memorial Hospital PresbyterianNewport Beach, CA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 050224
- Northwestern Medicine Central Dupage HospitalWinfield, IL · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 140242
- Northwestern Medicine Delnor Community HospitalGeneva, IL · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 140211
Practice locations
Addresses where Thomas J. Ahearn is enrolled with Medicare (CMS data updated October 2, 2026).
- 1325 N Highland AveAurora, IL 60506 (630) 859‑2222
- 27650 Ferry RdWarrenville, IL 60555 (630) 225‑2663
Group practices
Medicare enrollment lists Thomas J. Ahearn as a member of these groups (CMS data updated October 2, 2026).
- Central Dupage Physician Group1,080 clinicians in the group
- Cepamerica Illinois LLP499 clinicians in the group
Specialties
- Physician Assistantprimary
Other physician assistants in Aurora
Clinicians with the same Medicare primary specialty in Aurora, IL — not a recommendation.
Other clinicians in Central Dupage Physician Group
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Graduation year | 2015 |
|---|---|
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1962872200 |
| Corrections | Report an error or suggest an update → |
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
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians