Quick answers
- Does Erin S. Duncan accept Medicare assignment?
- Yes. Medicare's clinician data says Erin S. Duncan accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- What is Erin S. Duncan's NPI number?
- 1821191222. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Practice locations
Addresses where Erin S. Duncan is enrolled with Medicare (CMS data updated October 2, 2026).
- 1255 W Arrow HwySan Dimas, CA 91773 (909) 394‑2526
Group practices
Medicare enrollment lists Erin S. Duncan as a member of this group (CMS data updated October 2, 2026).
- Southern California Permanente Medical Group11,293 clinicians in the group
Specialties
- Optometryprimary
Other optometrists in San Dimas
Clinicians with the same Medicare primary specialty in San Dimas, CA — not a recommendation.
Other clinicians in Southern California Permanente Medical Group
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | OD |
|---|---|
| Optometry school | State University Of New York - State College Optometry |
| Graduation year | 2002 (24 years since optometry school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1821191222 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians