What is Claire Hammer's NPI number?

Claire Hammer's National Provider Identifier (NPI) is 1861389405, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.

What is Claire Hammer's specialty?

Claire Hammer is listed in the NPPES registry with a primary specialty of Clinical Social Worker (Behavioral Health & Social Service Providers).

Where is Claire Hammer located?

Claire Hammer's practice location on file with NPPES is 1841 Park Ave, New York, NY 10035-1316.

What is Claire Hammer's phone number?

The practice phone number listed in the NPPES registry for Claire Hammer is (646) 459-6156.

Is Claire Hammer's NPI active?

Yes — Claire Hammer's NPI (1861389405) is active in the NPPES registry as of the last update on 2025-06-18.

IndividualActive

Claire Hammer, LMSW

NPI 1861389405 · Clinical Social Worker · New York, NY

Claire Hammer, LMSW is a Clinical Social Worker provider in New York, NY (NPI 1861389405).

Provider details

NPI number: 1861389405
Entity type: Individual
Primary specialty: Clinical Social WorkerBehavioral Health & Social Service Providers
Credential: LMSW
Sex: Female
Sole proprietor: No

Specialties & taxonomies

Clinical Social WorkerPrimary1041C0700X
Behavioral Health & Social Service Providers

Profile Score

Basic profile(48/100 index)

A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.

Registry tenure38% of score
1 yr in NPPES registry
Profile completeness38% of score
83% of core fields populated
Practice footprint23% of score
1 documented practice location

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

1841 Park Ave

New York, NY 10035-1316

Phone: (646) 459-6156

Street-level locationGet directions

More NY providers

Mailing address