Quick answers
- Does Alan S. Nakanishi accept Medicare assignment?
- Yes. Medicare's clinician data says Alan S. Nakanishi 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 Alan S. Nakanishi see?
- In 2024, CMS data shows 304 Original Medicare patients and 778 services for Alan S. Nakanishi. This counts Original Medicare only and measures volume, not quality.
- What is Alan S. Nakanishi's NPI number?
- 1770690505. 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 Alan S. Nakanishi, 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 | 304 |
|---|---|
| Services billed to Medicare | 778 |
| Different services or procedures | 12 |
| 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)187 services
- Established patient complete exam of visual system (92014)152 services
- Photography of the retina (92250)139 services
- Imaging of retina (92134)133 services
- New patient complete exam of visual system (92004)59 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%
- Diabetes49%
- Arthritis38%
- Chronic kidney disease37%
- Ischemic heart disease30%
Practice locations
Addresses where Alan S. Nakanishi is enrolled with Medicare (CMS data updated October 2, 2026).
- 2160 W Grant Line Rd, Suite 100Tracy, CA 95377 (209) 835‑2227
Group practices
Medicare enrollment lists Alan S. Nakanishi as a member of this group (CMS data updated October 2, 2026).
- Delta Eye Medical Group, Inc.8 clinicians in the group
Specialties
- Ophthalmologyprimary
Other ophthalmologists in California
Clinicians with the same Medicare primary specialty in California — not a recommendation.
Other clinicians in Delta Eye Medical Group, Inc.
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Loma Linda University School Of Medicine |
| Graduation year | 1965 (61 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1770690505 |
| 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