Quick answers
- Does Montserrat J. Castaneda accept Medicare assignment?
- Yes. Medicare's clinician data says Montserrat J. Castaneda 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 Montserrat J. Castaneda's NPI number?
- 1811540198. 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 Montserrat J. Castaneda is enrolled with Medicare (CMS data updated October 2, 2026).
- 1650 Los Gamos DrSan Rafael, CA 94903 (415) 444‑7900
Group practices
Medicare enrollment lists Montserrat J. Castaneda as a member of this group (CMS data updated October 2, 2026).
- Permanente Medical Group Inc10,996 clinicians in the group
Specialties
- Optometryprimary
Other optometrists in San Rafael
Clinicians with the same Medicare primary specialty in San Rafael, CA — not a recommendation.
Other clinicians in Permanente Medical Group Inc
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | OD |
|---|---|
| Optometry school | University Of California - School Of Optometry |
| Graduation year | 2019 (7 years since optometry school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1811540198 |
| 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