Mark Dennehy
NPI 1336000165 · Addiction (Substance Use Disorder) Counselor · Butte, MT
Mark Dennehy is a Addiction (Substance Use Disorder) Counselor provider in Butte, MT (NPI 1336000165).
Provider details
- NPI number
- 1336000165
- Entity type
- Individual
- Primary specialty
- Addiction (Substance Use Disorder) CounselorBehavioral Health & Social Service Providers
- Sex
- Male
- Sole proprietor
- Yes
- License
- 19009 (MT)
Specialties & taxonomies
Behavioral Health & Social Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
Under 1 yr in registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Registry dates
- Enumerated
- 2025-11-20
- Last updated
- 2025-11-20
- Certified
- 2025-11-20
Frequently asked questions
- What is Mark Dennehy's NPI number?
- Mark Dennehy's National Provider Identifier (NPI) is 1336000165, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Dennehy's specialty?
- Mark Dennehy is listed in the NPPES registry with a primary specialty of Addiction (Substance Use Disorder) Counselor (Behavioral Health & Social Service Providers).
- Where is Mark Dennehy located?
- Mark Dennehy's practice location on file with NPPES is 630 W Mercury St, Butte, MT 59701-1510.
- What is Mark Dennehy's phone number?
- The practice phone number listed in the NPPES registry for Mark Dennehy is (406) 299-3448.
- Is Mark Dennehy's NPI active?
- Yes — Mark Dennehy's NPI (1336000165) is active in the NPPES registry as of the last update on 2025-11-20.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.