Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

A J Klein MD A Professional Corporation

Q: What is the NPI number for A J Klein MD A Professional Corporation?

The NPI for A J Klein MD A Professional Corporation is 1639487150, a Type 2 (organization) record in the CMS NPPES registry.

Internal Medicine Physician in Alpine, CA · enumerated 2010 · authorized official Arvin Klein, President.

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

National Provider Identifier

1639487150

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Registry record

Entity type Organization (Type 2)

Legal business name A J Klein MD A Professional Corporation

Practice address 3897 Via Palo Verde Lago, Alpine, CA, 91901

Phone (619) 659-9555

Fax (619) 659-9666

Enumeration date Sep 17, 2010

Last updated in NPPES Sep 17, 2010

Taxonomy & classification

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License G4721 (CA) Primary

Authorized official

Name Arvin Klein

Title President

Phone (619) 659-9555

Other identifiers

Identifier	Type	State	Issuer
GO4721B	Medicaid	CA	-

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

What is the NPI number for A J Klein MD A Professional Corporation?

The NPI for A J Klein MD A Professional Corporation is 1639487150, a Type 2 (organization) record in the CMS NPPES registry.

Who is the authorized official for A J Klein MD A Professional Corporation?

NPPES lists Arvin Klein (President) as the authorized official for this organization.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2010-09-17.