Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

MR. GREGORY A. ALEFF LCSW
NPI 1942245592
Social Worker - Clinical in Appleton, WI

Active since June 18, 2006
10 TRI PARK WAY, APPLETON, WI 54914(920) 831-7909 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: August 16, 2026.

About Mr. Gregory A. Aleff Lcsw NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

MR. GREGORY A. ALEFF LCSW (NPI 1942245592) is an individual clinical provider in Appleton, Wisconsin, licensed in Wisconsin (962-123) and active in the NPI registry since June 2006.

NPPES Registry Identity

NPI1942245592
Entity TypeIndividualMale
Primary Taxonomy1041C0700X
Provider Legal NameMR. GREGORY A. ALEFFCredential: LCSW
Location Address10 TRI PARK WAYAppleton, WI 54914-1658
Mailing AddressW6031 Blazing Star DrAppleton, WI 54915-7422 · (920) 731-0988
Sole ProprietorNo
Enumeration DateJune 18, 2006
Last NPPES UpdateJuly 13, 2026
NPI 1942245592 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

Primary SpecialtySocial Worker · ClinicalBehavioral Health & Social Service Providers
Taxonomy Code1041C0700X
License Licensed in WI · 962-123
Definition
A social worker who holds a master's or doctoral degree in social work from an accredited school of social work in addition to at least two years of post-master's supervised experience in a clinical setting. The social worker must be licensed, certified, or registered at the clinical level in the jurisdiction of practice. A clinical social worker provides direct services, including interventions focused on interpersonal interactions, intrapsychic dynamics, and life management issues. Clinical social work services are based on bio-psychosocial perspectives. Services consist of assessment, diagnosis, treatment (including psychotherapy and counseling), client-centered advocacy, consultation, evaluation, and prevention of mental illness, emotional, or behavioral disturbances.
10 TRI PARK WAY, Appleton, WI 54914

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

Psychologist (Clinical)
10 TRI PARK WAY
APPLETON, WI 54914
Registered Nurse
10 TRI PARK WAY
APPLETON, WI 54914
Psychiatry & Neurology (Psychiatry)
10 TRI PARK WAY
APPLETON, WI 54914
Pharmacist (Psychiatric)
10 TRI PARK WAY
APPLETON, WI 54914
Internal Medicine
10 TRI PARK WAY
APPLETON, WI 54914
Registered Nurse (Ambulatory Care)
10 TRI PARK WAY
APPLETON, WI 54914
Registered Nurse
10 TRI PARK WAY
APPLETON, WI 54914
Internal Medicine
10 TRI PARK WAY
APPLETON, WI 54914

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Gregory Aleff's NPI number?

The NPI number for Gregory Aleff is 1942245592. It was assigned to this individual provider in the NPPES registry on June 18, 2006.

Where is Gregory Aleff located?

Gregory Aleff practices at 10 Tri Park Way, Appleton, WI 54914. The listed phone number is (920) 831-7909.

What is Gregory Aleff's specialty?

The primary specialty registered for this NPI is Social Worker, specializing in Clinical, with taxonomy code 1041C0700X.

When was this NPI record last updated?

The NPPES record for Gregory Aleff was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 41 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.