Quick answers
- Does Isadora H. Ritter accept Medicare assignment?
- Medicare's clinician data says Isadora H. Ritter may accept Medicare assignment (as of October 2, 2026). Ask the office whether they accept it for your visit.
- How many Medicare patients does Isadora H. Ritter see?
- In 2024, CMS data shows 34 Original Medicare patients and 69 services for Isadora H. Ritter. This counts Original Medicare only and measures volume, not quality.
- What is Isadora H. Ritter's NPI number?
- 1548552110. 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 Isadora H. Ritter, 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 | 34 |
|---|---|
| Services billed to Medicare | 69 |
| Different services or procedures | 11 |
| Participating Medicare provider | Yes |
| Average age of these patients | 67 |
Most frequent services
- Photography of the retina (92250)27 services
- New patient complete exam of visual system (92004)16 services
- Established patient complete exam of visual system (92014)11 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 pressure68%
- High cholesterol68%
- Diabetes44%
- Arthritis35%
Practice locations
Addresses where Isadora H. Ritter is enrolled with Medicare (CMS data updated October 2, 2026).
- 1264 Castle Hill AveBronx, NY 10462 (718) 823‑5006
- 500 E Sandford BlvdMount Vernon, NY 10550 (516) 301‑0333
Group practices
Medicare enrollment lists Isadora H. Ritter as a member of these groups (CMS data updated October 2, 2026).
- Castle Hill Optometry PLLC2 clinicians in the group
- Vivid Vision Optometry PLLC2 clinicians in the group
Specialties
- Optometryprimary
Other optometrists in Bronx
Clinicians with the same Medicare primary specialty in Bronx, NY — not a recommendation.
Other clinicians in Castle Hill Optometry PLLC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | OD |
|---|---|
| Optometry school | State University Of New York - State College Optometry |
| Graduation year | 2011 (15 years since optometry school) |
| Gender (as listed) | Female |
| Medicare assignment | May accept for some services |
| NPI (National Provider Identifier) | 1548552110 |
| 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