Quick answers
- Does Marinelle D. Sebastian accept Medicare assignment?
- Yes. Medicare's clinician data says Marinelle D. Sebastian 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 Marinelle D. Sebastian see?
- In 2024, CMS data shows 20 Original Medicare patients and 32 services for Marinelle D. Sebastian. This counts Original Medicare only and measures volume, not quality.
- What is Marinelle D. Sebastian's NPI number?
- 1568134831. 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 Marinelle D. Sebastian, 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 | 20 |
|---|---|
| Services billed to Medicare | 32 |
| Different services or procedures | 10 |
| Participating Medicare provider | Yes |
| Average age of these patients | 68 |
Most frequent services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)12 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%
- Arthritis60%
Practice locations
Addresses where Marinelle D. Sebastian is enrolled with Medicare (CMS data updated October 2, 2026).
- 100 Moody Ct, Suite 200Thousand Oaks, CA 91360 (805) 418‑3500
- 248 Hampshire Rd, Suite 100Thousand Oaks, CA 91361 (805) 370‑0040
- 7204 Foothill BlvdTujunga, CA 91042 (818) 352‑8333
- 9064 Van Nuys BlvdPanorama City, CA 91402 (818) 892‑9000
Group practices
Medicare enrollment lists Marinelle D. Sebastian as a member of these groups (CMS data updated October 2, 2026).
- The Regents of the University of California1,462 clinicians in the group
- First Aid Urgent Care Inc16 clinicians in the group
Specialties
- Nurse Practitionerprimary
Other nurse practitioners in Thousand Oaks
Clinicians with the same Medicare primary specialty in Thousand Oaks, CA — not a recommendation.
Other clinicians in The Regents of the University of California
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | NP |
|---|---|
| Graduation year | 2020 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1568134831 |
| 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