Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Sihoun Hahn, MD, PHD

Q: What is the NPI number for Sihoun Hahn?

The National Provider Identifier (NPI) for Sihoun Hahn is 1538109558, a Type 1 (individual) record in the CMS NPPES registry.

Clinical Biochemical Genetics Physician in Seattle, WA · enumerated 2006.

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

National Provider Identifier

1538109558

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Registry record

Entity type Individual (Type 1)

Name Sihoun Hahn

Credential MD, PHD

Sex Male

Practice address 4800 Sand Point Way Ne, M/S B-6594, Seattle, WA, 98105

Phone (206) 987-3012

Fax (206) 987-5329

Enumeration date Jun 7, 2006

Last updated in NPPES Mar 2, 2011

Taxonomy & licenses

207SG0202X Clinical Biochemical Genetics Physician Allopathic & Osteopathic Physicians · License MD00047081 (WA) Primary

207SG0201X Clinical Genetics (M.D.) Physician Allopathic & Osteopathic Physicians · License MD00047081 (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
8462368	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.

Read the full guide → Validate an NPI →

Frequently asked questions

What is the NPI number for Sihoun Hahn?

The National Provider Identifier (NPI) for Sihoun Hahn is 1538109558, a Type 1 (individual) record in the CMS NPPES registry.

Where does Sihoun Hahn practice?

The practice location on file with NPPES is in Seattle, WA. Providers can have multiple locations; NPPES lists the primary practice address.

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2011-03-02.