ALINA S POPA MD
NPI 1003893348
Hospitalist in Riverside, CA
About Alina S Popa Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
ALINA S POPA MD (NPI 1003893348) is an individual hospitalist provider in Riverside, California, licensed in California (107794) and active in the NPI registry since December 2005. She is enrolled in Medicare PECOS and is a graduate of Other (1994).
NPPES Registry Identity
Specialties & Licenses 2
Other Identifiers 3
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
Alina S Popa 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.
Medicare Billing Reassignments
2Medicare enrollment records show Alina Popa reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Riverside, CA 92501
- Reassigned Medicare billing, California enrollment
- 48 clinicians in this Medicare group
San Diego, CA 92103
- Reassigned Medicare billing, California enrollment
- 1,051 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 5
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 92501 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
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.
RIVERSIDE, CA 92501
RIVERSIDE, CA 92501
RIVERSIDE, CA 92501
RIVERSIDE, CA 92501
RIVERSIDE, CA 92501
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Alina Popa's NPI number?
The NPI number for Alina Popa is 1003893348. It was assigned to this individual provider in the NPPES registry on December 28, 2005.
Where is Alina Popa located?
Alina Popa practices at 4445 Magnolia Ave, Riverside, CA 92501. The listed phone number is (951) 788-3636.
What is Alina Popa's specialty?
The primary specialty registered for this NPI is Hospitalist with taxonomy code 208M00000X.
Is Alina Popa enrolled in Medicare?
Yes. Alina Popa is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Alina Popa's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Alina Popa reassigns Medicare benefits to 2 organizations: Alertive Healthcare Medical Group Apc (Riverside, CA) and Regents Of The University Of California (San Diego, CA). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Alina Popa's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Alina Popa was last updated on April 30, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Alina S Popa, MD · NPI 1003893348
Hospitalist physician in Riverside, California. Individual provider, active in the CMS NPPES registry since December 28, 2005.
## Identity
- **NPI:** 1003893348 (Entity type: Individual)
- **Enumerated:** December 28, 2005
- **Primary specialty:** Hospitalist · taxonomy 208M00000X
- **State license:** 107794 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 4445 MAGNOLIA AVE, Riverside, CA 92501-4135
- **Phone:** (951) 788-3636
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 2 organizations under Medicare reassignment (form CMS-855R): Alertive Healthcare Medical Group Apc (NPI 1467024331, Riverside, CA); Regents Of The University Of California (NPI 1487772380, San Diego, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 1994
## Record status
- **NPPES last updated:** April 30, 2023
- **Other identifiers:** Medicaid 156612100 (MN); Medicaid ENROLLED (MN); Other P00646046 (MN)
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Source: [NPI Profile](https://npiprofile.com/npi/1003893348) · Data from the CMS NPPES public registry.