MARK THOMAS EWING MD
NPI 1023166816
Internal Medicine - Gastroenterology in Woodland Hills, CA
About Mark Thomas Ewing Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MARK THOMAS EWING MD (NPI 1023166816) is an individual gastroenterology provider in Woodland Hills, California, licensed in California (A74992) and active in the NPI registry since January 2007. He is enrolled in Medicare PECOS and is a graduate of Other (1999).
NPPES Registry Identity
Specialties & Licenses
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
Mark Thomas Ewing 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 Reassignment
Medicare enrollment records show Mark Ewing reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Woodland Hills, CA 91367
- Reassigned Medicare billing, California enrollment
- 13,921 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 91367 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.
WOODLAND HILLS, CA 91367
WOODLAND HILLS, CA 91367
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 Ewing's NPI number?
The NPI number for Mark Ewing is 1023166816. It was assigned to this individual provider in the NPPES registry on January 8, 2007.
Where is Mark Ewing located?
Mark Ewing practices at 5601 De Soto Ave, Woodland Hills, CA 91367. The listed phone number is (818) 719-2000.
What is Mark Ewing's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Gastroenterology, with taxonomy code 207RG0100X.
Is Mark Ewing enrolled in Medicare?
Yes. Mark Ewing 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 Ewing's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Mark Ewing reassigns Medicare benefits to Southern California Permanente Medical Group (Woodland Hills, 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 Ewing'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 Ewing was last updated on November 30, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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 Thomas Ewing, MD · NPI 1023166816
Gastroenterology physician in Woodland Hills, California. Individual provider, active in the CMS NPPES registry since January 8, 2007.
## Identity
- **NPI:** 1023166816 (Entity type: Individual)
- **Enumerated:** January 8, 2007
- **Primary specialty:** Internal Medicine - Gastroenterology · taxonomy 207RG0100X
- **State license:** A74992 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 5601 DE SOTO AVE, Woodland Hills, CA 91367-6701
- **Phone:** (818) 719-2000
## 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:** Southern California Permanente Medical Group (NPI 1952333478, Woodland Hills, CA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 1999
## Record status
- **NPPES last updated:** November 30, 2021
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Source: [NPI Profile](https://npiprofile.com/npi/1023166816) · Data from the CMS NPPES public registry.