Quick answers
- Does Greta Gregg accept Medicare assignment?
- Yes. Medicare's clinician data says Greta Gregg 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 Greta Gregg see?
- In 2024, CMS data shows 71 Original Medicare patients and 196 services for Greta Gregg. This counts Original Medicare only and measures volume, not quality.
- What is Greta Gregg's NPI number?
- 1134787559. 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 Greta Gregg, 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 | 71 |
|---|---|
| Services billed to Medicare | 196 |
| Different services or procedures | 18 |
| Participating Medicare provider | Yes |
| Average age of these patients | 75 |
Most frequent services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)83 services
- Exam of visual field with extended testing (92083)31 services
- Imaging of optic nerve (92133)14 services
- Photography of the retina (92250)12 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%
- Arthritis66%
- Diabetes46%
- Chronic kidney disease34%
- Ischemic heart disease32%
Practice locations
Addresses where Greta Gregg is enrolled with Medicare (CMS data updated October 2, 2026).
- 3241 S Michigan AveChicago, IL 60616 (312) 949‑7751
Group practices
Medicare enrollment lists Greta Gregg as a member of this group (CMS data updated October 2, 2026).
- Illinois College of Optometry76 clinicians in the group
Specialties
- Optometryprimary
Other optometrists in Chicago
Clinicians with the same Medicare primary specialty in Chicago, IL — not a recommendation.
Other clinicians in Illinois College of Optometry
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | OD |
|---|---|
| Optometry school | Illinois College Of Optometry At Chicago |
| Graduation year | 2019 (7 years since optometry school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1134787559 |
| 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