Alan S. Nakanishi, M.D.
Ophthalmology Physician · Stockton, CA
Alan S. Nakanishi, M.D. is an ophthalmology physician with a practice address in Stockton, California, and NPI 1770690505, issued on Aug 25, 2006. Check the license (California G012131, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Alan S. Nakanishi
- Credential
- M.D.
- Primary taxonomy
- Ophthalmology Physician 207W00000X
- License number
- G012131 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1617 Saint Marks Plz, Stockton, CA 95207
- Phone
- (209) 478-1797
- Enumerated
- Aug 25, 2006
- Record last updated
- Jun 3, 2008 (not updated in 18 years: call before relying on the address or phone)
- Fax
- (209) 478-1224
- Medicaid ID
- 00G121310 CA
- Medicare enrollment
- Enrolled (PECOS I20080613000229); accepts Medicare assignment
- Medical or professional school
- Loma Linda University School Of Medicine, 1965
- Entity
- Type 1 · individual
Also registered at 1617 Saint Marks Plz
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Jeffrey Ing, M.D.Ophthalmology Physician1871600114
- Maria Solis Lopez, PT, DPTPhysical Therapist1265250872
- Julie Tse, O.D.Optometrist1811301401
- Nina VitoreloPhysical Therapist1497562839
Verify Alan S. Nakanishi in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G012131Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
59% fewer Medicare Part D claims than the average ophthalmology physician in 2024
627 Medicare Part D claims for 182 beneficiaries, against an average of 1,518 among the 16,459 providers of this specialty who prescribed in Part D. Brand-name drugs were 53% of claims.
Most prescribed
- Latanoprost279 claims
- Brimonidine Tartrate63 claims
- Erythromycin43 claims
- Timolol Maleate30 claims
- Lumigan28 claims
- Dorzolamide-Timolol19 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The practice group's MIPS final score for 2023 (Medicare payment program): 100 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- Delta Eye Medical Group, Inc.Tracy, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Ophthalmology Physician providers in California
There are 2,899 ophthalmology physician records in California.
Other ophthalmology physician records in California
- Sam Abbassi, MD, MSWest Hills, CA1881937720
- Richard Abbott, M.D.San Francisco, CA1346276573
- Jean-Paul Abboud, M.D., PH.D.Del Mar, CA1760776728
- Nizar Abdelfattah, MDPasadena, CA1801359393
- Parastou Abedi, MDAliso Viejo, CA1720067333
- Shahla Abedi, MDAliso Viejo, CA1467431072
- Lilit Ablabutyan, M.D.Glendale, CA1497013064
- Nathan Abraham, M.D.Valencia, CA1306224456
- James Abrams, M.D.San Bruno, CA1912903329
- Adam Abroms, MDWestlake Village, CA1497743702
Common questions
What is Alan S. Nakanishi, M.D.'s NPI number?
Alan S. Nakanishi, M.D.'s National Provider Identifier (NPI) is 1770690505, issued on Aug 25, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Alan S. Nakanishi, M.D. located?
The NPPES record lists a practice address at 1617 Saint Marks Plz, Stockton, CA, 95207. Phone: (209) 478-1797. Providers update this record themselves, so call before visiting.
How can I verify Alan S. Nakanishi, M.D.'s license?
NPPES lists California license number G012131, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Alan S. Nakanishi, M.D. prescribe under Medicare Part D?
In 2024, Alan S. Nakanishi, M.D. had 627 Medicare Part D claims for 182 beneficiaries; the average among ophthalmology physician prescribers was 1,518. Part D covers Medicare prescriptions only.
What is Alan S. Nakanishi, M.D.'s MIPS final score?
The 2023 MIPS final score is 100 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.