NPPES file of Aug 9, 2026

Hillary Grennan, LCSW

Clinical Social Worker · New Providence, NJ

Hillary Grennan, LCSW is a clinical social worker with a practice address in New Providence, New Jersey, and NPI 1477982221, issued on Nov 2, 2013. Check the license with the New Jersey board that licenses this profession; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1477982221
Name
Hillary Grennan
Credential
LCSW
Primary taxonomy
Clinical Social Worker 1041C0700X
Practice location
890 Mountain Ave, New Providence, NJ 07974
Phone
(908) 277-8900
Enumerated
Nov 2, 2013
Record last updated
Feb 26, 2025
Medicare enrollment
Enrolled (PECOS I20150126000178); accepts Medicare assignment
Telehealth
Offers telehealth (CMS)
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
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8 nearest clinical social worker records → All 9,790 in New Jersey → Look up another NPI →

Also registered at 890 Mountain Ave

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Johaira Akwei, LPCProfessional Counselor1861105413
  2. Deborah Almonte, LCSWClinical Social Worker1689775058
  3. Melanie Andrade-Ramos, LCSWClinical Social Worker1639703663
  4. Susan Angelicola, MSN, RNCObstetrics & Gynecology Nurse Practitioner1265593933
  5. Jennifer Askin, LCSWClinical Social Worker1275203143
  6. Iris AybarClinical Social Worker1205371598

Verify Hillary Grennan in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersWhich New Jersey board licenses this professionCheck the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Find the New Jersey license search

PlainDoctor does not match the HHS-OIG exclusion list to individual records: most entries carry no NPI. Search the OIG exclusion list by name.

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Bills Medicare through one group practice

  1. Summit Medical Group PABerkeley Heights, NJ

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).

Hillary Grennan among 9,790 clinical social worker records in New Jersey

Hillary Grennan, LCSW is one of 9,790 clinical social worker records with a practice address in New Jersey. 12% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2013, is newer than 41% of them.

  • NPI issued2013 · 41% of these records are older, 54% newer
  • In a Medicare fileYes · 12% of these records are
  • In the CMS Doctors and Clinicians fileYes · 22% of these records are
  • Graduated2008 · median 2006 among the 2,147 with a school on file
  • Record last updated2025 · 59% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 1041C0700X and a New Jersey practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

53 clinical social worker records list a practice address in New Providence

They are 53 of the 300 NPPES records with a practice address in New Providence, and 9,790 clinical social worker records in New Jersey.

All 9,790 in New Jersey → Every provider in New Providence → Clinical Social Worker nationwide →

The 8 clinical social worker records with the nearest ZIP codes

  1. Deborah Almonte, LCSWNew Providence, NJ 079741689775058
  2. Milissa Aronson, L.C.S.W.New Providence, NJ 079741083028005
  3. Patricia Baroff, LCSWMurray Hill, NJ 079741194942839
  4. Elizabeth Clarke, LCSWNew Providence, NJ 079741902229628
  5. Joann Cohen, LCSWNew Providence, NJ 079741659449478
  6. Erika Inzano, LCSWNew Providence, NJ 079741982909297
  7. Brooke LasterNew Providence, NJ 079741598194698
  8. Sarah MasucciNew Providence, NJ 079741588068001

Common questions

What is Hillary Grennan, LCSW's NPI number?

Hillary Grennan, LCSW's National Provider Identifier (NPI) is 1477982221, issued on Nov 2, 2013. An NPI identifies a provider in billing; it is not a license.

Where is Hillary Grennan, LCSW located?

The NPPES record lists a practice address at 890 Mountain Ave, New Providence, NJ, 07974. Phone: (908) 277-8900. Providers update this record themselves, so call before visiting.

How can I verify Hillary Grennan, LCSW's license?

Search the New Jersey board that licenses this profession; the NPPES record confirms identity only.

Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.