What is Louis Stein's NPI number?

Louis Stein's National Provider Identifier (NPI) is 1669303087, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.

What is Louis Stein's specialty?

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

Where is Louis Stein located?

Louis Stein's practice location on file with NPPES is 1493 Cambridge St, Cambridge, MA 02139-1099.

What is Louis Stein's phone number?

The practice phone number listed in the NPPES registry for Louis Stein is (617) 665-1185.

Is Louis Stein's NPI active?

Yes — Louis Stein's NPI (1669303087) is active in the NPPES registry as of the last update on 2026-05-26.

IndividualActive

Louis Stein

NPI 1669303087 · Social Worker · Cambridge, MA

Louis Stein is a Social Worker provider in Cambridge, MA (NPI 1669303087).

Provider details

NPI number: 1669303087
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(46/100 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

1493 Cambridge St

Cambridge, MA 02139-1099

Phone: (617) 665-1185

Street-level locationGet directions

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Mailing address