Quick answers
- Does Leon G. Partamian accept Medicare assignment?
- Yes. Medicare's clinician data says Leon G. Partamian 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 Leon G. Partamian see?
- In 2024, CMS data shows 400 Original Medicare patients and 1,992 services for Leon G. Partamian. This counts Original Medicare only and measures volume, not quality.
- What is Leon G. Partamian's NPI number?
- 1700808904. 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 Leon G. Partamian, 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 | 400 |
|---|---|
| Services billed to Medicare | 1,992 |
| Different services or procedures | 19 |
| Participating Medicare provider | Yes |
| Average age of these patients | 78 |
Most frequent services
- Established patient problem focused exam of visual system (92012)739 services
- Exam of visual field with extended testing (92083)292 services
- Photography of the retina (92250)225 services
- Exam of the internal drainage system of eye (92020)199 services
- Established patient complete exam of visual system (92014)178 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 cholesterol75%
- Arthritis48%
- Diabetes35%
- Ischemic heart disease30%
- Osteoporosis23%
Practice locations
Addresses where Leon G. Partamian is enrolled with Medicare (CMS data updated October 2, 2026).
- 1220 La Venta Dr, Suite 203Westlake Village, CA 91361 (805) 497‑8100
- 3085 Loma Vista RdVentura, CA 93003 (805) 648‑3085
Group practices
Medicare enrollment lists Leon G. Partamian as a member of this group (CMS data updated October 2, 2026).
- Miramar Eye Specialists Medical Group Inc27 clinicians in the group
Specialties
- Ophthalmologyprimary
Other ophthalmologists in Westlake Village
Clinicians with the same Medicare primary specialty in Westlake Village, CA — not a recommendation.
Other clinicians in Miramar Eye Specialists Medical Group Inc
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1978 (48 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1700808904 |
| 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