Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. William Curtis Herwig, DC

Chiropractor in Streator, IL · enumerated 2005.

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

National Provider Identifier

1871587139

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Registry record

Entity type Individual (Type 1)

Name Dr. William Curtis Herwig

Credential DC

Sex Male

Practice address 712 North Bloomington Street, Streator, IL, 61364

Phone (815) 672-6961

Fax (815) 672-6891

Enumeration date Sep 1, 2005

Last updated in NPPES Dec 2, 2015

Taxonomy & licenses

111N00000X Chiropractor Chiropractic Providers · License 038007374 (IL) Primary

DC · Doctor of Chiropractic: A licensed chiropractor focusing on musculoskeletal and nervous system disorders. About the DC credential

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

Is NPI 1871587139 active?

Yes, as of the latest NPPES snapshot, NPI 1871587139 is active (record last updated 2015-12-02).

How do I verify William Herwig's NPI record?

Cross-check NPI 1871587139 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2015-12-02.