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

MS. DEBORAH K NELLES LCSW LAC PC
NPI 1619903267
Counselor - Addiction (Substance Use Disorder) in Helena, MT

Q: What is Deborah Nelles's NPI number?

The NPI number for Deborah Nelles is 1619903267. It was assigned to this individual provider in the NPPES registry on June 24, 2006.

Q: What is Deborah Nelles's specialty?

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

Q: When was this NPI record last updated?

The NPPES record for Deborah Nelles 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 28 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.

Active since June 24, 2006

510 LESLIE AVE, HELENA, MT 59601(406) 442-9978(406) 449-2754 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).

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About Ms. Deborah K Nelles Lcsw Lac Pc NPPES

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

MS. DEBORAH K NELLES LCSW LAC PC (NPI 1619903267) is an individual addiction (substance use disorder) provider in Helena, Montana, licensed in (52) and active in the NPI registry since June 2006.

NPPES Registry Identity

NPI1619903267

Entity TypeIndividualFemale

Primary Taxonomy101YA0400X

Provider Legal NameMS. DEBORAH K NELLESCredential: LCSW LAC PC

Location Address510 LESLIE AVEHelena, MT 59601

Mailing Address510 Leslie AveHelena, MT 59601 · (406) 442-9978 · Fax (406) 449-2754

Phone(406) 442-9978

Fax(406) 449-2754

Sole ProprietorNo

Enumeration DateJune 24, 2006

Last NPPES UpdateJuly 13, 20262 updates tracked since enumeration

✔ NPI 1619903267 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 · 52

Also ListedSocial Worker · ClinicalTaxonomy 1041C0700X · License LCSW420 (MT)

510 LESLIE AVE, Helena, MT 59601

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Other Identifiers 1

Medicaid0503455MT

Other Providers at the Same Location NPPES

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

DEBORAH K NELLES P.C.

Social Worker (Clinical)

510 LESLIE AVE
HELENA, MT 59601

Lewis And Clark County (406) 442-9978

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 Deborah Nelles's NPI number?

The NPI number for Deborah Nelles is 1619903267. It was assigned to this individual provider in the NPPES registry on June 24, 2006.

Where is Deborah Nelles located?

Deborah Nelles practices at 510 Leslie Ave, Helena, MT 59601. The listed phone number is (406) 442-9978.

What is Deborah Nelles'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 Deborah Nelles 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 28 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.