Quick answers
- Does Maria L. Castillo accept Medicare assignment?
- Yes. Medicare's clinician data says Maria L. 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.
- How many Medicare patients does Maria L. Castillo see?
- In 2024, CMS data shows 67 Original Medicare patients and 180 services for Maria L. Castillo. This counts Original Medicare only and measures volume, not quality.
- What is Maria L. Castillo's NPI number?
- 1184924144. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Maria L. Castillo, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 67 |
|---|---|
| Services billed to Medicare | 180 |
| Different services or procedures | 19 |
| Participating Medicare provider | Yes |
| Average age of these patients | 72 |
Most frequent services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)81 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High blood pressure75%
- High cholesterol75%
- Diabetes52%
- Arthritis46%
- Anxiety33%
- Ischemic heart disease30%
Practice locations
Addresses where Maria L. Castillo is enrolled with Medicare (CMS data updated October 2, 2026).
- 2071 Compton Ave, Suite 101Corona, CA 92881 (951) 549‑0900
Group practices
Medicare enrollment lists Maria L. Castillo as a member of this group (CMS data updated October 2, 2026).
- Healthcare Partners Affiliates Medical Group754 clinicians in the group
Specialties
- Physician Assistantprimary
Other physician assistants in Corona
Clinicians with the same Medicare primary specialty in Corona, CA — not a recommendation.
Other clinicians in Healthcare Partners Affiliates Medical Group
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | PA |
|---|---|
| Graduation year | 2010 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1184924144 |
| 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
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- 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