Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Alexander Leighton, MD

Internal Medicine Physician in Brookings, OR · enumerated 2006.

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

National Provider Identifier

1063422608

Verified

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Registry record

Entity type Individual (Type 1)

Name Alexander Leighton

Credential MD

Sex Male

Practice address 555 5th Street, Suite 2, Brookings, OR, 97415

Phone (541) 469-9205

Fax (541) 469-9204

Enumeration date Aug 8, 2006

Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License MD23295 (OR) Primary

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License A85511 (CA) Secondary

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

Other identifiers

Identifier	Type	State	Issuer
262304	Medicaid	OR	-
P00224664	Other	-	RAILROAD

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 Alexander Leighton?

Alexander Leighton is registered in NPPES with the primary taxonomy of Internal Medicine Physician. 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.

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