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

Hillary Grennan, LCSW

Individual provider Clinical Social Worker · NPI 1477982221

Hillary Grennan, LCSW is a Clinical Social Worker in New Providence, New Jersey. Qualified in 2008, 18 years ago. Practices with Summit Medical Group PA, a 1,205-clinician group, works from 3 locations, accepts Medicare assignment and offers telehealth.

Years since qualifying
18
In the registry since
2013
What do these letters mean?
LCSW — Licensed Clinical Social Worker
A social worker licensed to diagnose and treat mental health conditions independently.

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Practice location Address checks out

890 Mountain Ave
New Providence, NJ 07974-1218
Phone: (908) 277-8900
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (2)

  • 37 Main St Ste 1054, Sparta, NJ 07871-1903 — (973) 670-0393
  • 492 Route 57 W, Washington, NJ 07882-4411 — (908) 689-1000

Specialties & licences

Clinical Social Worker (primary) Taxonomy 1041C0700X

Record details

NPI number1477982221
Entity typeIndividual (Type 1)
GenderFemale
Credentials LCSW
Sole proprietorNo
NPI enumeratedNovember 2, 2013
Last updated in NPPESFebruary 26, 2025
Certification dateFebruary 26, 2025
Mailing address56 Main St, Hackettstown, NJ 07840-1364

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyCLINICAL SOCIAL WORKER
Medical schoolOTHER
Graduated 2008 (18 years in practice)
Group practice Summit Medical Group Pa — 1205 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services

Other providers in New Providence