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

Gregory Lee Mahoney, M.A., L.C.P.C.

Professional Counselor in Bloomingdale, IL · enumerated 2006.

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

National Provider Identifier

1588739411

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Registry record

Entity type Individual (Type 1)

Name Gregory Lee Mahoney

Credential M.A., L.C.P.C.

Sex Male

Practice address Bloomingdale, IL, 60108

Phone (224) 289-2054

Enumeration date Nov 24, 2006

Last updated in NPPES Mar 9, 2021

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

Taxonomy & licenses

101YP2500X Professional Counselor Behavioral Health & Social Service Providers · License 180003430 (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.

Read the full guide → Validate an NPI →

Frequently asked questions

Where does Gregory Mahoney practice?

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

What is the NPI number for Gregory Mahoney?

The National Provider Identifier (NPI) for Gregory Mahoney is 1588739411, a Type 1 (individual) record in the CMS NPPES registry.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-03-09.