MR. MARK SAMIR SALEM
NPI 1821356254
Internal Medicine - Gastroenterology in Orange, CA
About Mr. Mark Samir Salem NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MR. MARK SAMIR SALEM (NPI 1821356254) is an individual gastroenterology provider in Orange, California, licensed in California (A127236) and active in the NPI registry since April 2012. He is enrolled in Medicare PECOS, maintains a secondary practice location in Los Angeles, and is a graduate of University Of Miami, Lm Miller School Of Medicine (2012).
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Location 1
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
Mr. Mark Samir Salem 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 Reassignment
Medicare enrollment records show Mark Salem reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Orange, CA 92868
- Reassigned Medicare billing, California enrollment
- 525 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
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 92868 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
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.
ORANGE, CA 92868
ORANGE, CA 92868
ORANGE, CA 92868
ORANGE, CA 92868
ORANGE, CA 92868
ORANGE, CA 92868
ORANGE, CA 92868
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 Salem's NPI number?
The NPI number for Mark Salem is 1821356254. It was assigned to this individual provider in the NPPES registry on April 23, 2012.
Where is Mark Salem located?
Mark Salem practices at 101 The City Dr S Ste 400, Orange, CA 92868. The listed phone number is (714) 456-7358.
What is Mark Salem's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Gastroenterology, with taxonomy code 207RG0100X.
Is Mark Salem enrolled in Medicare?
Yes. Mark Salem 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 organization bills Medicare for Mark Salem's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Mark Salem reassigns Medicare benefits to Uc Regents (Orange, CA). The 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 Salem'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 Salem was last updated on February 4, 2020. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 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.
# Mr. Mark Samir Salem · NPI 1821356254
Gastroenterology physician in Orange, California. Individual provider, active in the CMS NPPES registry since April 23, 2012.
## Identity
- **NPI:** 1821356254 (Entity type: Individual)
- **Enumerated:** April 23, 2012
- **Primary specialty:** Internal Medicine - Gastroenterology · taxonomy 207RG0100X
- **State license:** A127236 (California)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 101 THE CITY DR S STE 400, Orange, CA 92868-3201
- **Phone:** (714) 456-7358
## 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:** Uc Regents (NPI 1003864174, Orange, CA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Miami, Lm Miller School Of Medicine, class of 2012
## Record status
- **NPPES last updated:** February 4, 2020
---
Source: [NPI Profile](https://npiprofile.com/npi/1821356254) · Data from the CMS NPPES public registry.