Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. Leland G. Siwek, M.D.
Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician in Spokane, WA · enumerated 2005 · practices at Providence Health & Services-Wa.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1801894811
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Registry record
Taxonomy & licenses
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| 1043025 | Medicaid | WA | - |
| G8870921 | Other | WA | MEDICARE PTAN |
| 11106981 | Other | ID | MEDICARE PTAN |
| G8878302 | Other | WA | MEDICARE PTAN |
| 004254400 | Medicaid | ID | - |
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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Other providers at this practice address
Browse all →Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-04-01.