MARK M. YOUSSEF M.D.
NPI 1235188400
Emergency Medicine in Victorville, CA
About Mark M. Youssef M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MARK M. YOUSSEF M.D. (NPI 1235188400) is an individual emergency medicine provider in Victorville, California, licensed in California (A49793) and active in the NPI registry since May 2006. He is enrolled in Medicare PECOS.
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 4
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Mark M. Youssef M.d. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignments
4Medicare enrollment records show Mark Youssef reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Los Angeles, CA 90023
- Reassigned Medicare billing, California enrollment
- 30 clinicians in this Medicare group
Norwalk, CA 90650
- Reassigned Medicare billing, California enrollment
- 47 clinicians in this Medicare group
Sun Valley, CA 91352
- Reassigned Medicare billing, California enrollment
- 11 clinicians in this Medicare group
Blythe, CA 92225
- Reassigned Medicare billing, California enrollment
- 50 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.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 92395 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.
VICTORVILLE, CA 92395
VICTORVILLE, CA 92395
VICTORVILLE, CA 92395
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 Mark Youssef's NPI number?
The NPI number for Mark Youssef is 1235188400. It was assigned to this individual provider in the NPPES registry on May 8, 2006.
Where is Mark Youssef located?
Mark Youssef practices at 15248 11th St Emergency Department, Victorville, CA 92395. The listed phone number is (760) 245-8691.
What is Mark Youssef's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is Mark Youssef enrolled in Medicare?
Yes. Mark Youssef is registered in the Medicare PECOS enrollment system.
Which organizations bill Medicare for Mark Youssef's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Mark Youssef reassigns Medicare benefits to 4 organizations: East La Emergency Physicians, Inc. (Los Angeles, CA), Coast Plaza Emergency Physicians Group Inc (Norwalk, CA), Erx Plus Professional Corporation (Sun Valley, CA) and Premier Health Partners (Blythe, 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 Mark Youssef'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 Mark Youssef was last updated on January 8, 2009. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 17 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.
# Mark M. Youssef, M.D. · NPI 1235188400
Emergency Medicine physician in Victorville, California. Individual provider, active in the CMS NPPES registry since May 8, 2006.
## Identity
- **NPI:** 1235188400 (Entity type: Individual)
- **Enumerated:** May 8, 2006
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** A49793 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 15248 11TH ST, EMERGENCY DEPARTMENT, Victorville, CA 92395-3704
- **Phone:** (760) 245-8691 · **Fax:** (760) 843-6020
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 4 organizations under Medicare reassignment (form CMS-855R): East La Emergency Physicians, Inc. (NPI 1588198055, Los Angeles, CA); Coast Plaza Emergency Physicians Group Inc (NPI 1912308446, Norwalk, CA); Erx Plus Professional Corporation (NPI 1003681693, Sun Valley, CA); Premier Health Partners (NPI 1609170232, Blythe, CA) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** January 8, 2009
- **Other identifiers:** Medicare PIN HA49793H (CA); Medicare PIN AZ516Z (CA); Medicaid 00A497930 (CA); and 1 more
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Source: [NPI Profile](https://npiprofile.com/npi/1235188400) · Data from the CMS NPPES public registry.