Quick answers
- Does Sean D. McKeown accept Medicare assignment?
- Yes. Medicare's clinician data says Sean D. McKeown 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 Sean D. McKeown see?
- In 2024, CMS data shows 151 Original Medicare patients and 1,240 services for Sean D. McKeown. This counts Original Medicare only and measures volume, not quality.
- What is Sean D. McKeown's NPI number?
- 1215020367. 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 Sean D. McKeown, 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 | 151 |
|---|---|
| Services billed to Medicare | 1,240 |
| Different services or procedures | 15 |
| Participating Medicare provider | Yes |
| Average age of these patients | 70 |
Most frequent services
- Established patient complete exam of visual system (92014)92 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)68 services
- Imaging of retina (92134)53 services
- Imaging of optic nerve (92133)35 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)32 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 cholesterol67%
- Arthritis38%
- Diabetes33%
- Anxiety24%
- Chronic kidney disease20%
Practice locations
Addresses where Sean D. McKeown is enrolled with Medicare (CMS data updated October 2, 2026).
- 16 Walnut StWillimantic, CT 06226 (860) 423‑2565
Group practices
Medicare enrollment lists Sean D. McKeown as a member of this group (CMS data updated October 2, 2026).
- Tricounty Vision Associates, L.L.C.3 clinicians in the group
Specialties
- Optometryprimary
Other optometrists in Connecticut
Clinicians with the same Medicare primary specialty in Connecticut — not a recommendation.
Other clinicians in Tricounty Vision Associates, L.L.C.
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | OD |
|---|---|
| Optometry school | Pennsylvania College Of Optometry |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1215020367 |
| 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