Quick answers
- Does Alonso Marquez Fuenmayor accept Medicare assignment?
- Yes. Medicare's clinician data says Alonso Marquez Fuenmayor 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.
- What is Alonso Marquez Fuenmayor's NPI number?
- 1952928319. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Alonso Marquez Fuenmayor works
Medicare's Facility Affiliation Data lists Alonso Marquez Fuenmayor 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.
- Christiana HospitalNewark, DE · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 080001
- Riverside Community HospitalRiverside, CA · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 050022
Practice locations
Addresses where Alonso Marquez Fuenmayor is enrolled with Medicare (CMS data updated October 2, 2026).
- 4234 Riverwalk Pkwy, Suite 230Riverside, CA 92505 (951) 781‑3672
- 4755 Ogletown Stanton RdNewark, DE 19718 (302) 623‑0188
Group practices
Medicare enrollment lists Alonso Marquez Fuenmayor as a member of these groups (CMS data updated October 2, 2026).
- Christiana Care Health Services Inc1,483 clinicians in the group
- El-Bershawi Medical Corp49 clinicians in the group
Specialties
Find other Critical Care (Intensivists) doctors in California →
Other critical care doctors in Riverside
Clinicians with the same Medicare primary specialty in Riverside, CA — not a recommendation.
Other clinicians in Christiana Care Health Services Inc
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2015 (11 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1952928319 |
| 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
- 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