MARK HALL
NPI 1891181103
Internal Medicine - Rheumatology in Westlake Village, CA
About Mark Hall NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MARK HALL (NPI 1891181103) is an individual rheumatology provider in Westlake Village, California, licensed in California (A167921) and active in the NPI registry since April 2015. He is enrolled in Medicare PECOS, maintains a secondary practice location in San Antonio, and is a graduate of Texas Tech University Health Science Center School Of Medicine (2015).
NPPES Registry Identity
Specialties & Licenses 2
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
Mark Hall 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 Hall reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Los Angeles, CA 90095
- Reassigned Medicare billing, California enrollment
- 1,766 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 7
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 91361 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 9
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
WESTLAKE VILLAGE, CA 91361
WESTLAKE VILLAGE, CA 91361
WESTLAKE VILLAGE, CA 91361
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 Hall's NPI number?
The NPI number for Mark Hall is 1891181103. It was assigned to this individual provider in the NPPES registry on April 13, 2015.
Where is Mark Hall located?
Mark Hall practices at 141 Triunfo Canyon Rd Ste 110, Westlake Village, CA 91361. The listed phone number is (805) 371-1393.
What is Mark Hall's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Rheumatology, with taxonomy code 207RR0500X.
Is Mark Hall enrolled in Medicare?
Yes. Mark Hall 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 Hall's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Mark Hall reassigns Medicare benefits to The Regents Of The University Of California (Los Angeles, 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 Hall'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 Hall was last updated on November 16, 2020. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 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 Hall · NPI 1891181103
Rheumatology physician in Westlake Village, California. Individual provider, active in the CMS NPPES registry since April 13, 2015.
## Identity
- **NPI:** 1891181103 (Entity type: Individual)
- **Enumerated:** April 13, 2015
- **Primary specialty:** Internal Medicine - Rheumatology · taxonomy 207RR0500X
- **State license:** A167921 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 141 TRIUNFO CANYON RD STE 110, Westlake Village, CA 91361-2525
- **Phone:** (805) 371-1393
## 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:** The Regents Of The University Of California (NPI 1235107566, Los Angeles, CA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Texas Tech University Health Science Center School Of Medicine, class of 2015
## Record status
- **NPPES last updated:** November 16, 2020
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Source: [NPI Profile](https://npiprofile.com/npi/1891181103) · Data from the CMS NPPES public registry.