Quick answers
- Does Jeffrey R. Parnell accept Medicare assignment?
- Yes. Medicare's clinician data says Jeffrey R. Parnell 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 Jeffrey R. Parnell see?
- In 2024, CMS data shows 1,090 Original Medicare patients and 21,278 services for Jeffrey R. Parnell. This counts Original Medicare only and measures volume, not quality.
- What is Jeffrey R. Parnell's NPI number?
- 1902873722. 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 Jeffrey R. Parnell, 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 | 1,090 |
|---|---|
| Services billed to Medicare | 21,278 |
| Different services or procedures | 28 |
| Participating Medicare provider | Yes |
| Average age of these patients | 79 |
Most frequent services
- Injection, faricimab-svoa, 0.1 mg (J2777)8,760 services
- Imaging of retina (92134)2,627 services
- Injection, aflibercept, 1 mg (J0178)1,902 services
- Injection of drug into eye (67028)1,712 services
- Injection, avacincaptad pegol, 0.1 mg (J2782)1,620 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%
- Arthritis50%
- Ischemic heart disease30%
- Diabetes28%
- Chronic kidney disease25%
Practice locations
Addresses where Jeffrey R. Parnell is enrolled with Medicare (CMS data updated October 2, 2026).
- 7447 W Talcott Ave, Suite 345Chicago, IL 60631 (847) 972‑2700
Group practices
Medicare enrollment lists Jeffrey R. Parnell as a member of this group (CMS data updated October 2, 2026).
- Retina Services of Illinois, LLC2 clinicians in the group
Specialties
- Ophthalmologyprimary
Other ophthalmologists in Chicago
Clinicians with the same Medicare primary specialty in Chicago, IL — not a recommendation.
Other clinicians in Retina Services of Illinois, LLC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | State University Of New York At Buffalo School Of Medicine |
| Graduation year | 1993 (33 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1902873722 |
| 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
- 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