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

Mary Yost

Organization Addiction (Substance Use Disorder) Counselor · NPI 1730748260

Mary Yost is an Addiction (Substance Use Disorder) Counselor in Portsmouth, New Hampshire. Registered with an NPI since 2019.

In the registry since
2019

Practice location Address checks out

212 Islington St
Portsmouth, NH 03801-4204
Phone: (603) 387-2256
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Addiction (Substance Use Disorder) Counselor (primary) Taxonomy 101YA0400X

Record details

NPI number1730748260
Entity typeOrganization (Type 2)
Organization subpartNo
Authorized official Elizabeth Carmer — Administrative Assistant · (603) 988-1015
NPI enumeratedJune 9, 2019
Last updated in NPPESJune 9, 2019
Mailing address212 Islington St, Portsmouth, NH 03801-4204

Other providers in Portsmouth