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

MRS. MARIE G. JOHNSTON R.N., L.A.D.C.
NPI 1235112137
Counselor - Addiction (Substance Use Disorder) in Waterbury, CT

Active since November 23, 2005
88 GRANDVIEW AVE, WESTMAIN BEHAVIORAL HEALTH, WATERBURY, CT 06708(203) 573-7500 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: August 09, 2026.

Record update history: Jul 13, 2026, Sep 11, 2025 (2 updates tracked since 2025).

About Mrs. Marie G. Johnston R.n., L.a.d.c. NPPES

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

MRS. MARIE G. JOHNSTON R.N., L.A.D.C. (NPI 1235112137) is an individual addiction (substance use disorder) provider in Waterbury, Connecticut, licensed in Connecticut (000399) and active in the NPI registry since November 2005.

NPPES Registry Identity

NPI1235112137
Entity TypeIndividualFemale
Primary Taxonomy101YA0400X
Provider Legal NameMRS. MARIE G. JOHNSTONCredential: R.N., L.A.D.C.
Location Address88 GRANDVIEW AVE, WESTMAIN BEHAVIORAL HEALTHWaterbury, CT 06708-2509
Mailing Address17 Sunset AveOakville, CT 06779-2111 · (860) 274-5925
Phone(203) 573-7500
Sole ProprietorNo
Enumeration DateNovember 23, 2005
Last NPPES UpdateJuly 13, 20262 updates tracked since enumeration
✔ NPI 1235112137 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyCounselor · Addiction (Substance Use Disorder)Behavioral Health & Social Service Providers
Taxonomy Code101YA0400X
License✔ Licensed in CT · 000399
Also ListedRegistered Nurse · Addiction (Substance Use Disorder)Taxonomy 163WA0400X · License E31451 (CT)
88 GRANDVIEW AVE, Waterbury, CT 06708
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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.

MRS. CAROL A GENOVA RN CADC
Counselor (Addiction (Substance Use Disorder))
88 GRANDVIEW AVE
WATERBURY, CT 06708
Naugatuck Valley Planning Region (203) 573-7500
DEON JOHNSON-ALLEN APRN
Nurse Practitioner (Psychiatric/Mental Health)
88 GRANDVIEW AVE
WATERBURY, CT 06708
Naugatuck Valley Planning Region (203) 573-7265
JULIE MARIE PIEPENBRING MSW, LCSW
Social Worker (Clinical)
88 GRANDVIEW AVE, BEHAVIORAL HEALTH OF WATERBURY HOSPITAL
WATERBURY, CT 06708
Naugatuck Valley Planning Region (203) 573-6103
MR. THOMAS MICHAEL CZARKOSKY LMFT
Marriage & Family Therapist
88 GRANDVIEW AVE, CHILDREN/ADOL
WATERBURY, CT 06708
Naugatuck Valley Planning Region (203) 573-7121
RUSSELL CHARLES HUFF LPC
Counselor (Mental Health)
88 GRANDVIEW AVE, ADULT BEHAVIORAL HEALTH
WATERBURY, CT 06708
Naugatuck Valley Planning Region (203) 573-7265
TRACY FOLLERT LCSW
Social Worker (Clinical)
88 GRANDVIEW AVE
WATERBURY, CT 06708
Naugatuck Valley Planning Region (203) 573-7265
RYAN DANIEL DOYLE D.O.
Psychiatry & Neurology (Psychiatry)
88 GRANDVIEW AVE
WATERBURY, CT 06708
Naugatuck Valley Planning Region (203) 573-7265
MRS. MICHELLE A MATTIACCIO APRN BC
Nurse Practitioner (Adult Health)
88 GRANDVIEW AVE
WATERBURY, CT 06708
Naugatuck Valley Planning Region (203) 573-7500

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 Marie Johnston's NPI number?

The NPI number for Marie Johnston is 1235112137. It was assigned to this individual provider in the NPPES registry on November 23, 2005.

Where is Marie Johnston located?

Marie Johnston practices at 88 Grandview Ave Westmain Behavioral Health, Waterbury, CT 06708. The listed phone number is (203) 573-7500.

What is Marie Johnston's specialty?

The primary specialty registered for this NPI is Counselor, specializing in Addiction (Substance Use Disorder), with taxonomy code 101YA0400X.

When was this NPI record last updated?

The NPPES record for Marie Johnston 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 31 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.