Quick answers
- Does Harish N. Shownkeen accept Medicare assignment?
- Yes. Medicare's clinician data says Harish N. Shownkeen 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 Harish N. Shownkeen see?
- In 2024, CMS data shows 81 Original Medicare patients and 288 services for Harish N. Shownkeen. This counts Original Medicare only and measures volume, not quality.
- What is Harish N. Shownkeen's NPI number?
- 1851311450. 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 Harish N. Shownkeen, 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 | 81 |
|---|---|
| Services billed to Medicare | 288 |
| Different services or procedures | 25 |
| Participating Medicare provider | Yes |
| Average age of these patients | 75 |
Most frequent services
- Ultrasonic guidance for blood vessel access (76937)51 services
- Insertion of tube into brain artery for diagnosis or treatment with review by radiologist (36226)31 services
- New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more (99205)28 services
- Insertion of tube into internal neck artery for diagnosis or treatment with review by radiologist (36224)26 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)24 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%
- Stroke or mini-stroke63%
- Arthritis51%
- Ischemic heart disease43%
- Anxiety31%
Hospitals where Harish N. Shownkeen works
Medicare's Facility Affiliation Data lists Harish N. Shownkeen 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 Harish N. Shownkeen is enrolled with Medicare (CMS data updated October 2, 2026).
- 0 N025 Winfield RdWinfield, IL 60190 (630) 260‑0600
- 25 N Winfield RdWinfield, IL 60190 (630) 933‑1600
Group practices
Medicare enrollment lists Harish N. Shownkeen as a member of these groups (CMS data updated October 2, 2026).
- Northwestern Medical Faculty Foundation4,503 clinicians in the group
- Central Dupage Physician Group1,080 clinicians in the group
Specialties
- Interventional Radiologyprimary
- Neurologyalso
Other interventional radiologists in Illinois
Clinicians with the same Medicare primary specialty in Illinois — not a recommendation.
Other clinicians in Northwestern Medical Faculty Foundation
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1979 (47 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1851311450 |
| 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