Quick answers
- Does Kelsi L. Greider-Sideris accept Medicare assignment?
- Yes. Medicare's clinician data says Kelsi L. Greider-Sideris 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 Kelsi L. Greider-Sideris see?
- In 2024, CMS data shows 401 Original Medicare patients and 1,167 services for Kelsi L. Greider-Sideris. This counts Original Medicare only and measures volume, not quality.
- What is Kelsi L. Greider-Sideris's NPI number?
- 1851771497. 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 Kelsi L. Greider-Sideris, 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 | 401 |
|---|---|
| Services billed to Medicare | 1,167 |
| Different services or procedures | 30 |
| Participating Medicare provider | Yes |
| Average age of these patients | 77 |
Most frequent services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)340 services
- Established patient complete exam of visual system (92014)203 services
- Imaging of optic nerve (92133)104 services
- Imaging of retina (92134)79 services
- Exam of visual field with extended testing (92083)73 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 cholesterol72%
- High blood pressure68%
- Arthritis49%
- Diabetes29%
- Osteoporosis22%
- Ischemic heart disease21%
Practice locations
Addresses where Kelsi L. Greider-Sideris is enrolled with Medicare (CMS data updated October 2, 2026).
- 2067 W Vista Way, Suite 120Vista, CA 92083 (760) 758‑2020
Group practices
Medicare enrollment lists Kelsi L. Greider-Sideris as a member of this group (CMS data updated October 2, 2026).
- Bradley W Greider M D Inc11 clinicians in the group
Specialties
- Ophthalmologyprimary
Other ophthalmologists in Vista
Clinicians with the same Medicare primary specialty in Vista, CA — not a recommendation.
Other clinicians in Bradley W Greider M D Inc
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Chicago College Of Medicine And Surgery |
| Graduation year | 2015 (11 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1851771497 |
| 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