Quick answers
- Does Joan Isabelle I. Barcenas accept Medicare assignment?
- Yes. Medicare's clinician data says Joan Isabelle I. Barcenas 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 Joan Isabelle I. Barcenas see?
- In 2024, CMS data shows 58 Original Medicare patients and 107 services for Joan Isabelle I. Barcenas. This counts Original Medicare only and measures volume, not quality.
- What is Joan Isabelle I. Barcenas's NPI number?
- 1285479261. 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 Joan Isabelle I. Barcenas, 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 | 58 |
|---|---|
| Services billed to Medicare | 107 |
| Different services or procedures | 17 |
| Participating Medicare provider | Yes |
| Average age of these patients | 75 |
Most frequent services
- Insertion of needle into vein for collection of blood sample (36415)42 services
- Administration of influenza virus vaccine (G0008)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 cholesterol75%
- High blood pressure69%
- Arthritis62%
- Ischemic heart disease52%
- Anxiety36%
- Depression34%
Hospitals where Joan Isabelle I. Barcenas works
Medicare's Facility Affiliation Data lists Joan Isabelle I. Barcenas at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- Saint John's Health CenterSanta Monica, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050290
Practice locations
Addresses where Joan Isabelle I. Barcenas is enrolled with Medicare (CMS data updated October 2, 2026).
- 1831 Wilshire Blvd, Suite BSanta Monica, CA 90403 (310) 400‑5565
Group practices
Medicare enrollment lists Joan Isabelle I. Barcenas as a member of this group (CMS data updated October 2, 2026).
- Providence Saint Johns Medical Foundation281 clinicians in the group
Specialties
- Nurse Practitionerprimary
Other nurse practitioners in Santa Monica
Clinicians with the same Medicare primary specialty in Santa Monica, CA — not a recommendation.
Other clinicians in Providence Saint Johns Medical Foundation
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | NP |
|---|---|
| Graduation year | 2023 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1285479261 |
| 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
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- 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