Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Arian Gower, M.D.

Nephrology Physician in Thousand Oaks, CA · enumerated 2016.

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

National Provider Identifier

1639531403

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Registry record

Entity type Individual (Type 1)

Name Dr. Arian Gower

Credential M.D.

Sex Male

Practice address 227 W Janss Rd Ste 310, Thousand Oaks, CA, 91360

Phone (805) 496-5800

Fax (805) 496-5800

Enumeration date Mar 22, 2016

Last updated in NPPES Feb 8, 2023

Taxonomy & licenses

207RN0300X Nephrology Physician Allopathic & Osteopathic Physicians · License A172943 (CA) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

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 1639531403 active?

Yes, as of the latest NPPES snapshot, NPI 1639531403 is active (record last updated 2023-02-08).

How do I verify Arian Gower's NPI record?

Cross-check NPI 1639531403 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-02-08.