Tammy Nguyen, OD
Optometrist · San Mateo, CA
Tammy Nguyen, OD is an optometrist with a practice address in San Mateo, California, and NPI 1396864575, issued on Mar 28, 2007. Check the license (California OPT 11827 TPA, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Tammy Nguyen
- Credential
- OD
- Primary taxonomy
- Optometrist 152W00000X
- License number
- OPT 11827 TPA CA
Self-reported in NPPES; status is on the state search - Practice location
- 50 S San Mateo Dr, San Mateo, CA 94401
- Phone
- (650) 342-4595
- Enumerated
- Mar 28, 2007
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20120402000567); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest optometrist records → All 8,308 in California → Look up another NPI →
Also registered at 50 S San Mateo Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Shelley Adams, MDObstetrics & Gynecology Physician1891801932
- Lois Balster, M.D.Pediatrics Physician1568578474
- Bruce Bern, M.D.Ophthalmology Physician1700954278
- Jeanne Beymer, MDPediatrics Physician1114913530
- Hayley Brown, MS, RN, FNP-CFamily Nurse Practitioner1518395169
- Stephen Buchner, MDPediatrics Physician1013938786
Verify Tammy Nguyen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license OPT 11827 TPACheck the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
55% more Medicare Part D claims than the average optometrist in 2024
428 Medicare Part D claims for 135 beneficiaries, against an average of 277 among the 33,128 providers of this specialty who prescribed in Part D. Brand-name drugs were 54% of claims.
Most prescribed
- Latanoprost82 claims
- Timolol Maleate77 claims
- Lumigan50 claims
- Restasis37 claims
- Brimonidine Tartrate29 claims
- Dorzolamide-Timolol28 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): 80 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).
Industry payments in 2024: $609.74
22 payments; by number, the most common kind was 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 one group practice
- Mid Peninsula Eye Physicians And Surgeons Medical GroupSan Mateo, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Tammy Nguyen among 8,308 optometrist records in California
Tammy Nguyen, 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 2007, is newer than 34% of them.
- NPI issued2007 · 34% of these records are older, 46% newer
- In a Medicare fileYes · 67% of these records are
- In the CMS Doctors and Clinicians fileYes · 43% of these records are
- Graduated2000 · median 2008 among the 3,573 with a school on file
- Record last updated2007 · 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 Mateo → Optometrist nationwide →
The 8 optometrist records with the nearest ZIP codes
- Rosemary Buduan, O.D.San Mateo, CA 944011114085685
- Nicholas Chan, ODSan Mateo, CA 944011407870074
- Sandra Cheng, ODSan Mateo, CA 944011982711446
- Gary HamillSan Mateo, CA 944011699833152
- Sharon Ho, ODSan Mateo, CA 944011952415879
- Gary Lai, O.D.San Mateo, CA 944011679697023
- Susie Lee, O.D.San Mateo, CA 944011932257037
- Wendy Lin, ODSan Mateo, CA 944011922127125
Common questions
What is Tammy Nguyen, OD's NPI number?
Tammy Nguyen, OD's National Provider Identifier (NPI) is 1396864575, issued on Mar 28, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Tammy Nguyen, OD located?
The NPPES record lists a practice address at 50 S San Mateo Dr, San Mateo, CA, 94401. Phone: (650) 342-4595. Providers update this record themselves, so call before visiting.
How can I verify Tammy Nguyen, OD's license?
NPPES lists California license number OPT 11827 TPA, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
How much does Tammy Nguyen, OD prescribe under Medicare Part D?
In 2024, Tammy Nguyen, OD had 428 Medicare Part D claims for 135 beneficiaries; the average among optometrist prescribers was 277. Part D covers Medicare prescriptions only.
What is Tammy Nguyen, OD's MIPS final score?
The 2023 MIPS final score is 80 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.