Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Ms. Heidi Tomczak

Social Worker in Mchenry, IL · enumerated 2015 · practices at Pioneer Center for Human Services.

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

National Provider Identifier

1811377336

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Registry record

Entity type Individual (Type 1)

Name Ms. Heidi Tomczak

Sex Female

Practice address 4031 W Dayton St, Mchenry, IL, 60050

Phone (815) 759-7108

Fax (815) 759-7115

Enumeration date Jun 1, 2015

Last updated in NPPES Jun 1, 2015

Taxonomy & licenses

104100000X Social Worker Behavioral Health & Social Service Providers 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.

Read the full guide → Validate an NPI →

Frequently asked questions

What is the NPI number for Heidi Tomczak?

The National Provider Identifier (NPI) for Heidi Tomczak is 1811377336, a Type 1 (individual) record in the CMS NPPES registry.

Where does Heidi Tomczak practice?

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

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2015-06-01.