OrganizationActive
Mountainside Westchester LLC
NPI 1457015331 · Community/Behavioral Health Agency · New York, NY
Provider details
- NPI number
- 1457015331
- Entity type
- Organization
- Primary specialty
- Community/Behavioral Health AgencyAgencies
- Organization subpart
- No
- Authorized official
- Michelle Williamson, Director(860) 362-5232
Specialties & taxonomies
Agencies
- Case Management Agency251B00000X
Agencies
Profile Score
Established profile(61/100 index)
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
4 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
243 W 18th St
New York, NY 10011-4569
Phone: (860) 362-5232
Fax: (877) 861-6507
Street-level locationGet directions
Mailing address
Po Box 717
Canaan, CT 06018-0717
Other names (DBA / former)
- Doing business as
- Mountainside - Chelsea
Registry dates
- Enumerated
- 2021-10-26
- Last updated
- 2022-03-25
- Certified
- 2022-03-25
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.