Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Peter Illing, LCSW

Q: What is the NPI number for Peter Illing?

The National Provider Identifier (NPI) for Peter Illing is 1922201813, a Type 1 (individual) record in the CMS NPPES registry.

Clinical Social Worker in Chicago, IL · enumerated 2007.

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

National Provider Identifier

1922201813

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Registry record

Entity type Individual (Type 1)

Name Peter Illing

Credential LCSW

Sex Male

Practice address Chicago, IL, 60613

Phone (773) 572-5500

Enumeration date Jun 7, 2007

Last updated in NPPES Sep 1, 2011

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

1041C0700X Clinical Social Worker Behavioral Health & Social Service Providers · License 149-004066 (IL) Primary

LCSW · Licensed Clinical Social Worker: A social worker licensed for clinical practice including mental-health therapy. About the LCSW 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

Where does Peter Illing practice?

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

What is the NPI number for Peter Illing?

The National Provider Identifier (NPI) for Peter Illing is 1922201813, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2011-09-01.