Quick answers
- Does Ricky J. Greenfield accept Medicare assignment?
- Yes. Medicare's clinician data says Ricky J. Greenfield 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 Ricky J. Greenfield see?
- In 2024, CMS data shows 654 Original Medicare patients and 1,809 services for Ricky J. Greenfield. This counts Original Medicare only and measures volume, not quality.
- What is Ricky J. Greenfield's NPI number?
- 1124190343. 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 Ricky J. Greenfield, 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 | 654 |
|---|---|
| Services billed to Medicare | 1,809 |
| Different services or procedures | 24 |
| Participating Medicare provider | Yes |
| Average age of these patients | 75 |
Most frequent services
- Photography of the retina (92250)609 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)326 services
- Established patient problem focused exam of visual system (92012)294 services
- Established patient complete exam of visual system (92014)209 services
- Removal of cataract with insertion of prosthetic lens (66984)60 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 cholesterol69%
- Arthritis42%
- Diabetes28%
- Chronic kidney disease23%
- Ischemic heart disease19%
Practice locations
Addresses where Ricky J. Greenfield is enrolled with Medicare (CMS data updated October 2, 2026).
- 3341 Main StKeokuk, IA 52632 (319) 524‑3892
Specialties
- Optometryprimary
Other optometrists in Iowa
Clinicians with the same Medicare primary specialty in Iowa — not a recommendation.
Clinician information
| Credential | OD |
|---|---|
| Optometry school | Illinois College Of Optometry At Chicago |
| Graduation year | 1990 (36 years since optometry school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1124190343 |
| 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