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

Justin Sean Gillis LLC

Organization Clinical Social Worker · NPI 1023642253

Justin Sean Gillis LLC provides Clinical Social Worker services in Belmont, Massachusetts. Registered with an NPI since 2020.

In the registry since
2020
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

115 Mill St
Belmont, MA 02478-1064
Phone: (617) 855-2459
Fax: (617) 855-3470
Show map & directions

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

Specialties & licences

Clinical Social Worker (primary) Taxonomy 1041C0700X

Record details

NPI number1023642253
Entity typeOrganization (Type 2)
Organization subpartNo
Authorized official Justin Gillis — Owner · (774) 273-0594
NPI enumeratedFebruary 26, 2020
Last updated in NPPESFebruary 26, 2020
Certification dateFebruary 26, 2020
Mailing address115 Mill St, Belmont, MA 02478-1064

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