Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Arnold Jay Klein, M.D.

Specialist in Portland, OR · enumerated 2006.

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

National Provider Identifier

1427162536

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Registry record

Entity type Individual (Type 1)

Name Dr. Arnold Jay Klein

Credential M.D.

Sex Male

Practice address 3500 N Interstate Ave, Portland, OR, 97227

Phone (503) 285-9321

Fax (503) 331-6145

Enumeration date Aug 18, 2006

Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

174400000X Specialist Other Service Providers · License OR MD17046 (OR) Primary

174400000X Specialist Other Service Providers · License WA MD00034916 (WA) Secondary

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

What specialty is Arnold Klein?

Arnold Klein is registered in NPPES with the primary taxonomy of Specialist. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.