Hillary Grennan, LCSW
NPI 1477982221 · Clinical Social Worker · New Providence, NJ
Enrolled with Medicare as Practitioner - Clinical Social Worker · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Hillary Grennan, LCSW is a Clinical Social Worker provider in New Providence, NJ (NPI 1477982221).
Provider details
- NPI number
- 1477982221
- Entity type
- Individual
- Primary specialty
- Clinical Social WorkerBehavioral Health & Social Service Providers
- Credential
- LCSW
- Sex
- Female
- Sole proprietor
- No
Specialties & taxonomies
Behavioral Health & Social Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
12 yrs in NPPES registry
- Profile completeness38% of score
83% of core fields populated
- Practice footprint23% of score
3 documented practice locations
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
Mailing address
Additional practice locations (2)
- 37 Main St Ste 1054Sparta, NJ 07871-1903Phone: (973) 670-0393
- 492 Route 57 WFamily Guidance Center of Warren CountyWashington, NJ 07882-4411Phone: (908) 689-1000Fax: (908) 689-4529
Registry dates
- Enumerated
- 2013-11-02
- Last updated
- 2025-02-26
- Certified
- 2025-02-26
Frequently asked questions
- What is Hillary Grennan's NPI number?
- Hillary Grennan's National Provider Identifier (NPI) is 1477982221, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Hillary Grennan's specialty?
- Hillary Grennan is listed in the NPPES registry with a primary specialty of Clinical Social Worker (Behavioral Health & Social Service Providers).
- Where is Hillary Grennan located?
- Hillary Grennan's practice location on file with NPPES is 890 Mountain Ave, New Providence, NJ 07974-1218.
- What is Hillary Grennan's phone number?
- The practice phone number listed in the NPPES registry for Hillary Grennan is (908) 277-8900.
- Does Hillary Grennan accept Medicare?
- Hillary Grennan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Hillary Grennan's NPI active?
- Yes — Hillary Grennan's NPI (1477982221) is active in the NPPES registry as of the last update on 2025-02-26.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.