Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mark Hall

Rheumatology Physician in Westlake Village, CA · enumerated 2015.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1891181103

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)

Name Mark Hall

Sex Male

Practice address 141 Triunfo Canyon Rd Ste 110, Westlake Village, CA, 91361

Phone (805) 371-1393

Enumeration date Apr 13, 2015

Last updated in NPPES Nov 16, 2020

Taxonomy & licenses

390200000X Student in an Organized Health Care Education/Training Program Student, Health Care Secondary

207RR0500X Rheumatology Physician Allopathic & Osteopathic Physicians · License A167921 (CA) Primary

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

Read the full guide → Validate an NPI →

Frequently asked questions

Is NPI 1891181103 active?

Yes, as of the latest NPPES snapshot, NPI 1891181103 is active (record last updated 2020-11-16).

How do I verify Mark Hall's NPI record?

Cross-check NPI 1891181103 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Other providers at this practice address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-11-16.