Mountainside - Nyc LLC
NPI 1427756469 · Substance Abuse Rehabilitation Facility · New York, NY
Mountainside - Nyc LLC is a Substance Abuse Rehabilitation Facility organization in New York, NY (NPI 1427756469).
Provider details
- NPI number
- 1427756469
- Entity type
- Organization
- Primary specialty
- Substance Abuse Rehabilitation FacilityResidential Treatment Facilities
- Organization subpart
- No
- Authorized official
- Michelle Williamson, Vp, Revenue Cycle(860) 362-5232
Specialties & taxonomies
Residential Treatment Facilities
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
3 yrs in NPPES 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
- 2023-02-20
- Last updated
- 2023-02-20
- Certified
- 2023-02-20
Frequently asked questions
- What is Mountainside - Nyc LLC's NPI number?
- Mountainside - Nyc LLC's National Provider Identifier (NPI) is 1427756469, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What type of organization is Mountainside - Nyc LLC?
- Mountainside - Nyc LLC is classified in the NPPES registry as Substance Abuse Rehabilitation Facility (Residential Treatment Facilities).
- Where is Mountainside - Nyc LLC located?
- Mountainside - Nyc LLC's practice location on file with NPPES is 243 W 18th St, New York, NY 10011-4569.
- What is Mountainside - Nyc LLC's phone number?
- The practice phone number listed in the NPPES registry for Mountainside - Nyc LLC is (860) 362-5232.
- Who is the authorized official for Mountainside - Nyc LLC?
- The authorized official listed on Mountainside - Nyc LLC's NPPES record is Michelle Williamson, Vp, Revenue Cycle. The authorized official registers and maintains the organization's NPI and is not necessarily its owner.
- Is Mountainside - Nyc LLC's NPI active?
- Yes — Mountainside - Nyc LLC's NPI (1427756469) is active in the NPPES registry as of the last update on 2023-02-20.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.