Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Ai (Theresa) Diem Nguyen, OD

Individual provider Optometrist · NPI 1508857533

Ai (Theresa) Diem Nguyen, OD is registered under Optometry in San Diego, California. Graduated from Pennsylvania College of Optometry in 2000, 26 years ago. Practices with California Eye Clinic, a 9-clinician group and accepts Medicare assignment. Licensed in California.

Years since qualifying
26
Trained at
Pennsylvania College of Optometry
Licensed in
CA
In the registry since
2005
What do these letters mean?
OD — Doctor of Optometry
An optometrist: examines eyes, prescribes glasses and contacts, and treats many eye conditions.

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Practice location Address checks out

6945 El Cajon Blvd
San Diego, CA 92115-1754 Not confirmed with CMS for 13 years — call before visiting
Phone: (619) 697-4600
Fax: (619) 464-5526
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Optometrist (primary) Taxonomy 152W00000X · Licence OPT11481 (CA)

Record details

NPI number1508857533
Entity typeIndividual (Type 1)
GenderFemale
Credentials OD
Sole proprietorNo
NPI enumeratedOctober 31, 2005
Last updated in NPPESFebruary 28, 2013

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyOPTOMETRY
Medical schoolPENNSYLVANIA COLLEGE OF OPTOMETRY
Graduated 2000 (26 years in practice)
Group practice California Eye Clinic — 9 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients121
Services billed 187 a service is one billed item, such as a visit, a test or a procedure
Average patient age73

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Colleagues at California Eye Clinic

Clinicians the CMS Doctors & Clinicians file lists under the same group practice.

Other providers in San Diego