Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

Mountainside - Nyc LLC

Organization Substance Abuse Rehabilitation Facility · NPI 1427756469

Mountainside - Nyc LLC is a Substance Abuse Rehabilitation Facility in New York, New York. Registered with an NPI since 2023.

In the registry since
2023
What do these letters mean?
LLC — Limited liability company
A form of business registration, not a clinical qualification.

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Practice location Address checks out

243 W 18th St
New York, NY 10011-4569
Phone: (860) 362-5232
Fax: (877) 861-6507
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Substance Abuse Rehabilitation Facility (primary) Taxonomy 324500000X

Record details

NPI number1427756469
Entity typeOrganization (Type 2)
Organization subpartNo
Authorized official Michelle Williamson — Vp, Revenue Cycle · (860) 362-5232
NPI enumeratedFebruary 20, 2023
Last updated in NPPESFebruary 20, 2023
Certification dateFebruary 20, 2023
Mailing address243 W 18th St, New York, NY 10011-4569

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