Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Katherine Elizabeth Siembab
Clinical Social Worker in Peru, IL · enumerated 2022.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1598485377
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Registry record
Entity type Individual (Type 1)
Name Katherine Elizabeth Siembab
Sex Female
Practice address 926 Grant St, Peru, IL, 61354
Phone (815) 883-1383
Enumeration date Aug 31, 2022
Last updated in NPPES Aug 31, 2022
Taxonomy & licenses
1041C0700X Clinical Social Worker Behavioral Health & Social Service Providers · License 149024180 (IL) Primary
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 Katherine Siembab?
Katherine Siembab is registered in NPPES with the primary taxonomy of Clinical Social Worker. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-08-31.