Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Liam O'Sullivan, M.D.

Emergency Medicine Physician in Wenatchee, WA · enumerated 2012.

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

National Provider Identifier

1639431133

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Registry record

Entity type Individual (Type 1)

Name Liam O'Sullivan

Credential M.D.

Sex Male

Practice address 1201 S Miller St, Wenatchee, WA, 98801

Phone (509) 663-8711

Enumeration date Jun 11, 2012

Last updated in NPPES Nov 3, 2015

Taxonomy & licenses

207P00000X Emergency Medicine Physician Allopathic & Osteopathic Physicians · License R73282 (AZ) Secondary

207P00000X Emergency Medicine Physician Allopathic & Osteopathic Physicians · License MD60546517 (WA) Primary

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
P01520092	Other	WA	RR PTAN WVH
1639431133	Medicaid	WA	-
P01520098	Other	WA	RR PTAN CWH

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 NPI 1639431133 active?

Yes, as of the latest NPPES snapshot, NPI 1639431133 is active (record last updated 2015-11-03).

How do I verify Liam O'Sullivan's NPI record?

Cross-check NPI 1639431133 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2015-11-03.