Quick answers
- Does Marilou C. Rosas accept Medicare assignment?
- Yes. Medicare's clinician data says Marilou C. Rosas 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 Marilou C. Rosas see?
- In 2024, CMS data shows 66 Original Medicare patients and 555 services for Marilou C. Rosas. This counts Original Medicare only and measures volume, not quality.
- What is Marilou C. Rosas's NPI number?
- 1053339960. 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 Marilou C. Rosas, 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 | 66 |
|---|---|
| Services billed to Medicare | 555 |
| Different services or procedures | 6 |
| Participating Medicare provider | Yes |
| Average age of these patients | 67 |
Most frequent services
- Psychotherapy with evaluation and management visit, 30 minutes (90833)263 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)251 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%
- Anxiety75%
- High blood pressure65%
- Depression59%
- Arthritis53%
- Diabetes23%
Practice locations
Addresses where Marilou C. Rosas is enrolled with Medicare (CMS data updated October 2, 2026).
- 10333 El Camino Real, Atascadero State HospitalAtascadero, CA 93423 (916) 651‑8811
- 31569 Canyon Estates Dr, Suite 113Lake Elsinore, CA 92532 (951) 506‑9112
Group practices
Medicare enrollment lists Marilou C. Rosas as a member of this group (CMS data updated October 2, 2026).
- Department of State Hospitals270 clinicians in the group
Specialties
- Psychiatryprimary
Other psychiatrists in Atascadero
Clinicians with the same Medicare primary specialty in Atascadero, CA — not a recommendation.
Other clinicians in Department of State Hospitals
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Southwest School Of Medicine And Hospital |
| Graduation year | 2006 (20 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) | 1053339960 |
| 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