Dr. Gregory N Lewis, PSY.D.

Dr. Gregory N Lewis is a Clinical Psychologist provider (Psychologist) practicing in Wheaton, IL, registered in the NPPES registry with NPI 1063471027 since 2006. The credential PSYD stands for Doctor of Psychology.

✓ Active NPI ✓ Valid NPI checksum Sole proprietor

NPI	1063471027
Entity type	Individual (Type 1)
Name	Dr. Gregory N Lewis
Credential	PSY.D.
Sex	Male
Practice address	Wheaton, IL, 60189
Phone	6306532300
Fax	6306532895
Enumeration date	2006-03-20
Last updated in NPPES	2021-04-26

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

Taxonomy & licenses

Taxonomy code	Specialty	Primary	License	State
103T00000X	Psychologist	Secondary	071004107	IL
103TC0700X	Clinical Psychologist	Primary	071-004107	IL

PSYD — Doctor of Psychology: A clinical doctorate in psychology focused on professional practice. About the PSYD credential

Other identifiers

Identifier	Type	State	Issuer
02215643	Other	IL	BLUE CROSS BLUE SHIELD

Copy-ready billing details

Provider: Gregory Lewis, PSY.D.
NPI: 1063471027
Taxonomy: 103TC0700X (Clinical Psychologist)
Address: Wheaton, IL, 60189

Other providers at this practice address

NPI	Name	Type	Specialty	Location
1225010119	Gerard Geurts	Individual	Physician Assistant	Wheaton, IL
1235103581	Anthony Altimari	Individual	Surgery Physician	Wheaton, IL
1487628475	David Klem	Individual	Surgery Physician	Wheaton, IL
1801862859	Dupage Surgical Consultants, Ltd.	Organization	Surgery Physician	Wheaton, IL
1144299769	Alliance Clinical Associates Sc	Organization	Psychiatry Physician	Wheaton, IL
1538138748	Kenneth Phillips	Individual	Psychiatry Physician	Wheaton, IL
1497724710	Elliott Pae	Individual	Psychiatry Physician	Wheaton, IL
1356300404	Angela Shield	Individual	Professional Counselor	Wheaton, IL

Verify this record

Cross-check NPI 1063471027 against the authoritative CMS record: view Dr. Gregory N Lewis on the official NPPES registry .

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 or validate an NPI number.

Frequently asked questions

Where does Gregory Lewis practice?

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

What is the NPI number for Gregory Lewis?

The National Provider Identifier (NPI) for Gregory Lewis is 1063471027, a Type 1 (individual) record in the CMS NPPES registry.

Source: CMS NPPES (public data). Snapshot 2026-07-11. Provider record last updated 2021-04-26.