Quick answers
- Does Javier A. Arias-Stella accept Medicare assignment?
- Yes. Medicare's clinician data says Javier A. Arias-Stella 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 Javier A. Arias-Stella see?
- In 2024, CMS data shows 661 Original Medicare patients and 1,842 services for Javier A. Arias-Stella. This counts Original Medicare only and measures volume, not quality.
- What is Javier A. Arias-Stella's NPI number?
- 1427469758. 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 Javier A. Arias-Stella, 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 | 661 |
|---|---|
| Services billed to Medicare | 1,842 |
| Different services or procedures | 25 |
| Participating Medicare provider | Yes |
| Average age of these patients | 73 |
Most frequent services
- Molecular pathology procedure; physician interpretation and report (G0452)505 services
- Microscopic genetic analysis of tumor, manual (88360)288 services
- Pathology examination of tissue using a microscope, moderately high complexity (88307)215 services
- Pathology examination of tissue using a microscope, intermediate complexity (88305)155 services
- Special stained specimen slides to examine tissue, each additional procedure (88341)143 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 pressure74%
- High cholesterol74%
- Cancer (breast, colorectal, lung, prostate, endometrial or leukemia/lymphoma)59%
- Arthritis46%
- Diabetes33%
- Ischemic heart disease31%
Practice locations
Addresses where Javier A. Arias-Stella is enrolled with Medicare (CMS data updated October 2, 2026).
- 1500 Duarte RdDuarte, CA 91010 (626) 256‑4673
- 1500 E Duarte RdDuarte, CA 91010
- 209 Fair Oaks AveSouth Pasadena, CA 91030 (626) 396‑2900
- 4900 Rivergrade Rd, Suite C210Irwindale, CA 91706 (626) 256‑4673
- 4920 Rivergrade Rd, Fl 1Irwindale, CA 91706 (626) 256‑4673
Group practices
Medicare enrollment lists Javier A. Arias-Stella as a member of this group (CMS data updated October 2, 2026).
- City of Hope Medical Foundation982 clinicians in the group
Specialties
- Pathologyprimary
Other pathologists in Duarte
Clinicians with the same Medicare primary specialty in Duarte, CA — not a recommendation.
Other clinicians in City of Hope Medical Foundation
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2010 (16 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1427469758 |
| 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