Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
William Keith Halligan, M.D.
Surgery Physician in Silverdale, WA · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1750332011
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Registry record
Entity type Individual (Type 1)
Name William Keith Halligan
Credential M.D.
Sex Male
Practice address 2200 Nw Myhre Rd, Silverdale, WA, 98383
Phone (360) 830-1100
Enumeration date May 12, 2006
Last updated in NPPES Mar 7, 2023
Taxonomy & licenses
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 |
|---|---|---|---|
| 75432 | Other | WA | LABOR & INDUSTRIES |
| 8933538 | Other | WA | CRIME VICTIMS COMP |
| 5858030 | Other | - | AETNA |
| HA1812 | Other | - | REGENCE BLUE SHIELD |
| 020004214 | Other | - | RAILROAD MEDICARE |
| 8177800 | 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.
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 William Halligan?
William Halligan is registered in NPPES with the primary taxonomy of Surgery Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.
Other providers at this practice address
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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-03-07.