Quick answers
- Does Marites P. Del Rosario accept Medicare assignment?
- Yes. Medicare's clinician data says Marites P. Del Rosario 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 Marites P. Del Rosario see?
- In 2024, CMS data shows 161 Original Medicare patients and 1,476 services for Marites P. Del Rosario. This counts Original Medicare only and measures volume, not quality.
- What is Marites P. Del Rosario's NPI number?
- 1205937349. 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 Marites P. Del Rosario, 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 | 161 |
|---|---|
| Services billed to Medicare | 1,476 |
| Different services or procedures | 8 |
| Participating Medicare provider | Yes |
| Average age of these patients | 68 |
Most frequent services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)895 services
- Psychotherapy with evaluation and management visit, 30 minutes (90833)562 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 cholesterol75%
- Depression72%
- Anxiety69%
- High blood pressure68%
- Arthritis53%
- Diabetes37%
Practice locations
Addresses where Marites P. Del Rosario is enrolled with Medicare (CMS data updated October 2, 2026).
- 1672 W Ave J, Suite 110Lancaster, CA 93534 (661) 726‑2826
Group practices
Medicare enrollment lists Marites P. Del Rosario as a member of this group (CMS data updated October 2, 2026).
- Av Behavioral Medicine Inc2 clinicians in the group
Specialties
- Psychiatryprimary
Other psychiatrists in Lancaster
Clinicians with the same Medicare primary specialty in Lancaster, CA — not a recommendation.
Other clinicians in Av Behavioral Medicine Inc
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1988 (38 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1205937349 |
| 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