ALONSO JOSE MARQUEZ FUENMAYOR MD
NPI 1952928319
Internal Medicine - Pulmonary Disease in Riverside, CA

Q: What is Alonso Marquez Fuenmayor's NPI number?

The NPI number for Alonso Marquez Fuenmayor is 1952928319. It was assigned to this individual provider in the NPPES registry on July 1, 2020.

Q: What is Alonso Marquez Fuenmayor's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Pulmonary Disease, with taxonomy code 207RP1001X.

Active since July 01, 2020PECOS EnrolledAccepts Medicare Assignment

4234 RIVERWALK PKWY STE 230, RIVERSIDE, CA 92505(951) 781-3672(951) 781-0365 Get Directions Write a Review

NPPES record last updated: April 22, 2026. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Apr 22, 2026, Jul 1, 2020 (2 updates tracked since 2020).

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About Alonso Jose Marquez Fuenmayor Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

ALONSO JOSE MARQUEZ FUENMAYOR MD (NPI 1952928319) is an individual pulmonary disease provider in Riverside, California, licensed in California (A207686) and active in the NPI registry since July 2020. He is enrolled in Medicare PECOS and is a graduate of Other (2015).

NPPES Registry Identity

NPI1952928319

Entity TypeIndividualMale

Primary Taxonomy207RP1001X

Provider Legal NameALONSO JOSE MARQUEZ FUENMAYORCredential: MD

Location Address4234 RIVERWALK PKWY STE 230Riverside, CA 92505-3312

Mailing Address4234 Riverwalk Pkwy Ste 230Riverside, CA 92505-3312 · (951) 781-3672 · Fax (951) 781-0365

Phone(951) 781-3672

Fax(951) 781-0365

Sole ProprietorNo

Medical School CMSOtherGraduated 2015

Enumeration DateJuly 1, 2020

Last NPPES UpdateApril 22, 20262 updates tracked since enumeration

NPPES CertifiedApril 22, 2026

✔ NPI 1952928319 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 3

★ Primary SpecialtyInternal Medicine · Pulmonary DiseaseAllopathic & Osteopathic Physicians

Taxonomy Code207RP1001X

License✔ Licensed in CA · A207686

Definition

An internist who treats diseases of the lungs and airways. The pulmonologist diagnoses and treats cancer, pneumonia, pleurisy, asthma, occupational and environmental diseases, bronchitis, sleep disorders, emphysema and other complex disorders of the lungs.

Also ListedInternal MedicineTaxonomy 207R00000X · License MT229847 (PA), A207686 (CA)

Also ListedInternal Medicine · Critical Care MedicineTaxonomy 207RC0200X · License A207686 (CA)

4234 RIVERWALK PKWY STE 230, Riverside, CA 92505

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Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Alonso Jose Marquez Fuenmayor Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID1759791155

PECOS Enrollment IDI20241104003298, I20260616001228

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

Medicare enrollment records show Alonso Marquez Fuenmayor reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

El-Bershawi Medical Corp

Same address

Critical Care Medicine

4234 RIVERWALK PKWY, SUITE 230
Riverside, CA 92505

Reassigned Medicare billing, California enrollment
114 clinicians in this Medicare group

NPI 1386813103 (951) 781-3672

Christiana Care Health Services Inc

2,332 mi

Hospitalist

200 HYGEIA DR, SUITE 2100
Newark, DE 19713

Reassigned Medicare billing, Delaware enrollment
460 clinicians in this Medicare group

NPI 1245474329 (302) 623-0188

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 92505 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient

$136.04 typical visit price

range $59.60 – $179.42

Typical copayment $34.01 (range $14.90 – $44.85)

Most-billed visit code 99204

Established Patient

$104.64 typical visit price

range $19.37 – $146.42

Typical copayment $26.16 (range $4.84 – $36.60)

Most-billed visit code 99214

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

DR. SAHAR HAMIDY OSMAN M.D.

Psychiatry & Neurology (Neurocritical Care)