Quick answers
- Does Catherine B. Castillo accept Medicare assignment?
- Yes. Medicare's clinician data says Catherine B. Castillo 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 Catherine B. Castillo's NPI number?
- 1588155170. 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 Catherine B. Castillo is enrolled with Medicare (CMS data updated October 2, 2026).
- 5201 Great America Pkwy, Suite 320Santa Clara, CA 95054 (323) 968‑6182
Group practices
Medicare enrollment lists Catherine B. Castillo as a member of this group (CMS data updated October 2, 2026).
- Sud Specialty Group - Ca568 clinicians in the group
Specialties
- Clinical Social Workerprimary
Other clinical social workers in Santa Clara
Clinicians with the same Medicare primary specialty in Santa Clara, CA — not a recommendation.
Other clinicians in Sud Specialty Group - Ca
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | CSW |
|---|---|
| Graduation year | 1995 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1588155170 |
| 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