Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Sonia Edith Zwilling, MD

Family Medicine Physician in Redmond, WA · enumerated 2006 · practices at King County Public Hospital District No. 2.

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

National Provider Identifier

1003904657

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Registry record

Entity type Individual (Type 1)

Name Sonia Edith Zwilling

Credential MD

Sex Female

Practice address 8980 161st Ave Ne, Suite 400, Redmond, WA, 98052

Phone (425) 899-2273

Fax (425) 899-2272

Enumeration date Oct 10, 2006

Last updated in NPPES Aug 1, 2011

Taxonomy & licenses

207Q00000X Family Medicine Physician Allopathic & Osteopathic Physicians · License MD00040411 (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
167384	Other	WA	WORKERS COMPENSATION
A007	Other	WA	TRICARE
8369936	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

Where does Sonia Zwilling practice?

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

What is the NPI number for Sonia Zwilling?

The National Provider Identifier (NPI) for Sonia Zwilling is 1003904657, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2011-08-01.