Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Ruben Krishnananthan, MD

Nuclear Medicine Physician in Lynnwood, WA · enumerated 2006.

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

National Provider Identifier

1891807863

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Registry record

Entity type Individual (Type 1)

Name Dr. Ruben Krishnananthan

Credential MD

Sex Male

Practice address 19020 33rd Ave W, Suite 210, Lynnwood, WA, 98036

Phone (425) 563-1500

Fax (425) 563-1501

Enumeration date Aug 31, 2006

Last updated in NPPES Dec 30, 2025

Taxonomy & licenses

207U00000X Nuclear Medicine Physician Allopathic & Osteopathic Physicians · License MD00045187 (WA) Primary

2085R0202X Diagnostic Radiology Physician Allopathic & Osteopathic Physicians · License MD00045187 (WA) 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
0356361	Other	WA	L&I-RADIA-REST OF WA
0356365	Other	WA	L&I-SWEDISH RADIA
0356366	Other	WA	L&I-EVERGREEN RADIA
1021587	Medicaid	WA	-

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.

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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 Ruben Krishnananthan?

Ruben Krishnananthan is registered in NPPES with the primary taxonomy of Nuclear Medicine 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 2025-12-30.