What is Isaac Klein's NPI number?

Isaac Klein's National Provider Identifier (NPI) is 1891686366, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.

What is Isaac Klein's specialty?

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

Where is Isaac Klein located?

Isaac Klein's practice location on file with NPPES is 465 Grand St, New York, NY 10002-7477.

What is Isaac Klein's phone number?

The practice phone number listed in the NPPES registry for Isaac Klein is (212) 240-1970.

Is Isaac Klein's NPI active?

Yes — Isaac Klein's NPI (1891686366) is active in the NPPES registry as of the last update on 2025-07-14.

IndividualActive

Isaac Klein

NPI 1891686366 · Social Worker · New York, NY

Isaac Klein is a Social Worker provider in New York, NY (NPI 1891686366).

Provider details

NPI number: 1891686366
Entity type: Individual
Primary specialty: Social WorkerBehavioral Health & Social Service Providers
Sex: Male
Sole proprietor: No

Specialties & taxonomies

Social WorkerPrimary104100000X
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
Under 1 yr in 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

465 Grand St

New York, NY 10002-7477

Phone: (212) 240-1970

Street-level locationGet directions

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Mailing address