Erin Song Duncan, OD
Optometrist · San Dimas, CA
Erin Song Duncan, OD is an optometrist with a practice address in San Dimas, California, and NPI 1821191222, issued on Sep 7, 2006. Check the license (California 12152TPA, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Erin Song Duncan
- Credential
- OD
- Primary taxonomy
- Optometrist 152W00000X
- License number
- 12152TPA CA
Self-reported in NPPES; status is on the state search - Practice location
- 1255 W Arrow Hwy, San Dimas, CA 91773
- Phone
- (909) 394-5380
- Enumerated
- Sep 7, 2006
- Record last updated
- Sep 7, 2022
- Medicare enrollment
- Enrolled (PECOS I20040520001311); accepts Medicare assignment
- Medical or professional school
- State University Of New York - State College Optometry, 2002
- Entity
- Type 1 · individual
8 nearest optometrist records → All 8,308 in California → Look up another NPI →
Also registered at 1255 W Arrow Hwy
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Stephanie Chang, D.O.Family Medicine Physician1740387091
- Nghi Dang, D.O.Family Medicine Physician1750657193
- Daryl EkPharmacist1841738226
Verify Erin Song Duncan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license 12152TPACheck the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
26% fewer Medicare Part D claims than the average optometrist in 2024
206 Medicare Part D claims for 54 beneficiaries, against an average of 277 among the 33,128 providers of this specialty who prescribed in Part D. Brand-name drugs were 8% of claims.
Most prescribed
- Latanoprost140 claims
- Timolol Maleate31 claims
- Brimonidine Tartrate11 claims
- Cyclosporine11 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.
Bills Medicare through one group practice
- Southern California Permanente Medical GroupSan Dimas, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Erin Song Duncan among 8,308 optometrist records in California
Erin Song Duncan, 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 2006, is newer than 6% of them.
- NPI issued2006 · 6% of these records are older, 66% newer
- In a Medicare fileYes · 67% of these records are
- In the CMS Doctors and Clinicians fileYes · 43% of these records are
- Graduated2002 · median 2008 among the 3,573 with a school on file
- Record last updated2022 · 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).
18 optometrist records list a practice address in San Dimas
They are 18 of the 942 NPPES records with a practice address in San Dimas, and 8,308 optometrist records in California.
All 8,308 in California → Every provider in San Dimas → Optometrist nationwide →
The 8 optometrist records with the nearest ZIP codes
- Suzan Burmayan, ODSan Dimas, CA 917731619498078
- Jennifer Chan, ODSan Dimas, CA 917731447734439
- Richard Garratt, O.D.San Dimas, CA 917731598813800
- Abigayle Gutierrez, ODSan Dimas, CA 917731134640048
- Joann Henwood, O.D.San Dimas, CA 917731689024523
- Kellie-Anne Ishii-Kim, ODSan Dimas, CA 917731710465372
- Julie Lam, O.D.San Dimas, CA 917731730560889
- Ashley Nakamura, O.D.San Dimas, CA 917731992251490
Common questions
What is Erin Song Duncan, OD's NPI number?
Erin Song Duncan, OD's National Provider Identifier (NPI) is 1821191222, issued on Sep 7, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Erin Song Duncan, OD located?
The NPPES record lists a practice address at 1255 W Arrow Hwy, San Dimas, CA, 91773. Phone: (909) 394-5380. Providers update this record themselves, so call before visiting.
How can I verify Erin Song Duncan, OD's license?
NPPES lists California license number 12152TPA, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
How much does Erin Song Duncan, OD prescribe under Medicare Part D?
In 2024, Erin Song Duncan, OD had 206 Medicare Part D claims for 54 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.