Newly Listed Provider — this NPI profile has been added to the NPI registry within the last 90 days.

MARY KATHLEEN MCMAHON LMHC
NPI 1215857487
Counselor - Mental Health in Massapequa Park, NY

Q: What is Mary Mcmahon's NPI number?

The NPI number for Mary Mcmahon is 1215857487. It was assigned to this individual provider in the NPPES registry on July 17, 2026.

Q: What is Mary Mcmahon's specialty?

The primary specialty registered for this NPI is Counselor, specializing in Mental Health, with taxonomy code 101YM0800X.

Q: When was this NPI record last updated?

The NPPES record for Mary Mcmahon was last updated on July 17, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 26 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.

Active since July 17, 2026

1035 PARK BLVD STE 2C, MASSAPEQUA PARK, NY 11762(516) 247-6449 Get Directions Write a Review

NPPES record added: July 17, 2026. Verified against the NPPES registry weekly; last sync: August 09, 2026.

On this page

About Mary Kathleen Mcmahon Lmhc NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

MARY KATHLEEN MCMAHON LMHC (NPI 1215857487) is an individual mental health provider in Massapequa Park, New York, licensed in New York (017914) and active in the NPI registry since July 2026. She maintains a secondary practice location in New York.

NPPES Registry Identity

NPI1215857487

Entity TypeIndividualFemale

Primary Taxonomy101YM0800X

Provider Legal NameMARY KATHLEEN MCMAHONCredential: LMHC

Location Address1035 PARK BLVD STE 2CMassapequa Park, NY 11762-2743

Mailing Address1035 Park Blvd Ste 2cMassapequa Park, NY 11762-2743 · (516) 247-6449

Phone(516) 247-6449

Sole ProprietorNo

Enumeration DateJuly 17, 2026

NPPES CertifiedJuly 17, 2026

✔ NPI 1215857487 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyCounselor · Mental HealthBehavioral Health & Social Service Providers

Taxonomy Code101YM0800X

License✔ Licensed in NY · 017914

1035 PARK BLVD STE 2C, Massapequa Park, NY 11762

Open in Google Maps ↗

Secondary Practice Location 1

Location 1303 5th Ave Rm 905New York, NY 10016-6682 · Phone (516) 247-6449

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Mary Mcmahon's NPI number?

The NPI number for Mary Mcmahon is 1215857487. It was assigned to this individual provider in the NPPES registry on July 17, 2026.

Where is Mary Mcmahon located?

Mary Mcmahon practices at 1035 Park Blvd Ste 2C, Massapequa Park, NY 11762. The listed phone number is (516) 247-6449.

What is Mary Mcmahon's specialty?

The primary specialty registered for this NPI is Counselor, specializing in Mental Health, with taxonomy code 101YM0800X.

When was this NPI record last updated?

The NPPES record for Mary Mcmahon was last updated on July 17, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 26 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.