Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Karina Alexandra Stone, MD

Neurology Physician in Portland, OR · enumerated 2007.

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

National Provider Identifier

1922149095

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Registry record

Entity type Individual (Type 1)

Name Karina Alexandra Stone

Credential MD

Sex Female

Practice address 1225 Ne 2nd Ave., Unity Center, Portland, OR, 97232

Phone (503) 944-8010

Enumeration date Feb 9, 2007

Last updated in NPPES Dec 30, 2016

Taxonomy & licenses

2084N0400X Neurology Physician Allopathic & Osteopathic Physicians · License 225874 (MA) 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 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.

What specialty is Karina Stone?

Karina Stone is registered in NPPES with the primary taxonomy of Neurology Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2016-12-30.