Quick answers
- Does Sean M. Sumsion accept Medicare assignment?
- Yes. Medicare's clinician data says Sean M. Sumsion 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 M. Sumsion see?
- In 2024, CMS data shows 1,445 Original Medicare patients and 22,329 services for Sean M. Sumsion. This counts Original Medicare only and measures volume, not quality.
- What is Sean M. Sumsion's NPI number?
- 1538504469. 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 M. Sumsion, 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 | 1,445 |
|---|---|
| Services billed to Medicare | 22,329 |
| Different services or procedures | 78 |
| Participating Medicare provider | Yes |
| Average age of these patients | 77 |
Most frequent services
- Injection, pegcetacoplan, intravitreal, 1 mg (J2781)3,780 services
- Imaging of retina (92134)2,109 services
- Injection, aflibercept, 1 mg (J0178)1,634 services
- Injection of drug into eye (67028)1,333 services
- Injection, aflibercept hd, 1 mg (J0177)1,224 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 cholesterol75%
- High blood pressure72%
- Arthritis41%
- Diabetes28%
- Ischemic heart disease21%
- Chronic kidney disease21%
Practice locations
Addresses where Sean M. Sumsion is enrolled with Medicare (CMS data updated October 2, 2026).
- 2801 Park Marina DrRedding, CA 96001 (530) 244‑2273
Group practices
Medicare enrollment lists Sean M. Sumsion as a member of this group (CMS data updated October 2, 2026).
- Riverside Eyecare Professionals Inc a Medical Corporation3 clinicians in the group
Specialties
- Ophthalmologyprimary
Other ophthalmologists in Redding
Clinicians with the same Medicare primary specialty in Redding, CA — not a recommendation.
Other clinicians in Riverside Eyecare Professionals Inc a Medical Corporation
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of California, Irvine, California College Of Medicine |
| Graduation year | 2012 (14 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1538504469 |
| 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