What is Lesley Mah's NPI number?

Lesley Mah's National Provider Identifier (NPI) is 1124988696, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.

What is Lesley Mah's specialty?

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

Where is Lesley Mah located?

Lesley Mah's practice location on file with NPPES is 279 E 3rd St, New York, NY 10009-7813.

What is Lesley Mah's phone number?

The practice phone number listed in the NPPES registry for Lesley Mah is (212) 477-8500.

Is Lesley Mah's NPI active?

Yes — Lesley Mah's NPI (1124988696) is active in the NPPES registry as of the last update on 2025-11-17.

IndividualActive

Lesley Mah

NPI 1124988696 · Social Worker · New York, NY

Lesley Mah is a Social Worker provider in New York, NY (NPI 1124988696).

Provider details

NPI number: 1124988696
Entity type: Individual
Primary specialty: Social WorkerBehavioral Health & Social Service Providers
Sole proprietor: No

Specialties & taxonomies

Social WorkerPrimary104100000X
Behavioral Health & Social Service Providers

Profile Score

Basic profile(47/100 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

279 E 3rd St

New York, NY 10009-7813

Phone: (212) 477-8500

Street-level locationGet directions

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Mailing address