Quick answers
- Where does Matthew Warren see patients?
- Medicare's clinician data lists 1 practice location in Norwalk, CA. Call before your visit to confirm the address.
- What is Matthew Warren's specialty?
- Medicare lists Critical Care (Intensivists) as the primary specialty, and also Pulmonary Disease.
- Does Matthew Warren accept Medicare assignment?
- Yes. Medicare's clinician data says Matthew Warren accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- What is the phone number for Matthew Warren?
- (916) 651-8811, as listed in official Medicare / NPI Registry data.
- What is Matthew Warren's NPI number?
- 1124412275. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Practice locations
Addresses where Matthew Warren is enrolled with Medicare (CMS data updated 2026-10-02).
- 11401 Bloomfield AveNorwalk, CA 90650 (916) 651‑8811
Group practices
Medicare enrollment lists Matthew Warren as a member of this group (CMS data updated 2026-10-02).
- Department of State Hospitals270 clinicians in the group
Specialties
Find other Critical Care (Intensivists) doctors in California →
Other critical care doctors in California
Clinicians with the same Medicare primary specialty in California — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2014 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1124412275 |
| 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 2026-10-02, retrieved 2026-10-29
- 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