Ryan Tsain Marr, OD
Optometrist · San Diego, CA
Ryan Tsain Marr, OD is an optometrist with a practice address in San Diego, California, and NPI 1235857525, issued on Aug 22, 2022. Check the license (California 35302, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Ryan Tsain Marr
- Credential
- OD
- Primary taxonomy
- Optometrist 152W00000X
- License number
- 35302 CA
Self-reported in NPPES; status is on the state search - Practice location
- 10737 Camino Ruiz Ste 140, San Diego, CA 92126
- Phone
- (844) 200-2426
- Enumerated
- Aug 22, 2022
- Record last updated
- Jun 4, 2025
- Medicare enrollment
- Enrolled (PECOS I20250904001246); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest optometrist records → All 8,308 in California → Look up another NPI →
Verify Ryan Tsain Marr in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license 35302Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
81% fewer Medicare Part D claims than the average optometrist in 2024
53 Medicare Part D claims for 28 beneficiaries, against an average of 277 among the 33,128 providers of this specialty who prescribed in Part D. Brand-name drugs were 40% of 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.
Industry payments in 2024: $19.44
1 payment: food and beverage; the largest payer was Alcon Vision LLC. The 34,453 providers of this specialty with any payment received $769.99 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through 2 group practices
- California Retina Associates, LPChula Vista, CA
- Centro DE Salud DE LA Comunidad DE San Ysidro, Inc.Alpine, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Ryan Tsain Marr among 8,308 optometrist records in California
Ryan Tsain Marr, OD is one of 8,308 optometrist records with a practice address in California. 67% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2022, is newer than 89% of them.
- NPI issued2022 · 89% of these records are older, 8% newer
- In a Medicare fileYes · 67% of these records are
- In the CMS Doctors and Clinicians fileYes · 43% of these records are
- Graduated2022 · median 2008 among the 3,573 with a school on file
- Record last updated2025 · 67% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 152W00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Optometrist providers in California
There are 8,308 optometrist records in California.
All 8,308 in California → Every provider in San Diego → Optometrist nationwide →
The 8 optometrist records with the nearest ZIP codes
- Duyen Cao, ODSan Diego, CA 921261144057829
- Allen Chung, ODSan Diego, CA 921261003301391
- Orlando Guiang, O.D.San Diego, CA 921261063404515
- Chi Huynh, O.D.San Diego, CA 921261922187426
- Denis Iwamoto, ODSan Diego, CA 921261194869131
- Benjamin Llanes, O.D.San Diego, CA 921261053309005
- Shan Ma, ODSan Diego, CA 921261174175129
- Thu Nguyen, O.D.San Diego, CA 921261457634404
Common questions
What is Ryan Tsain Marr, OD's NPI number?
Ryan Tsain Marr, OD's National Provider Identifier (NPI) is 1235857525, issued on Aug 22, 2022. An NPI identifies a provider in billing; it is not a license.
Where is Ryan Tsain Marr, OD located?
The NPPES record lists a practice address at 10737 Camino Ruiz Ste 140, San Diego, CA, 92126. Phone: (844) 200-2426. Providers update this record themselves, so call before visiting.
How can I verify Ryan Tsain Marr, OD's license?
NPPES lists California license number 35302, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
How much does Ryan Tsain Marr, OD prescribe under Medicare Part D?
In 2024, Ryan Tsain Marr, OD had 53 Medicare Part D claims for 28 beneficiaries; the average among optometrist prescribers was 277. Part D covers Medicare prescriptions only.
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.