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CHRISTINA MCMAHON CASAC-MASTER
NPI 1598654618
Counselor - Addiction (Substance Use Disorder) in Massapequa Park, NY

Active since July 02, 2025PECOS Enrolled
5100 SUNRISE HWY FL 2, MASSAPEQUA PARK, NY 11762(631) 696-4357 Get Directions Write a Review

NPPES record last updated: July 2, 2025. Verified against the NPPES registry weekly; last sync: October 18, 2026.

About Christina Mcmahon Casac-master NPPES

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

CHRISTINA MCMAHON CASAC-MASTER (NPI 1598654618) is an individual addiction (substance use disorder) provider in Massapequa Park, New York, licensed in New York (35120) and active in the NPI registry since July 2025. The provider is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1598654618
Entity TypeIndividual
Primary Taxonomy101YA0400X
Provider Legal NameCHRISTINA MCMAHONCredential: CASAC-MASTER
Location Address5100 SUNRISE HWY FL 2Massapequa Park, NY 11762-2935
Mailing Address1377 Motor Pkwy Ste 102Islandia, NY 11749-5249
Phone(631) 696-4357
Sole ProprietorNo
Enumeration DateJuly 2, 2025
NPPES CertifiedJuly 2, 2025
✔ NPI 1598654618 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyCounselor · Addiction (Substance Use Disorder)Behavioral Health & Social Service Providers
Taxonomy Code101YA0400X
License✔ Licensed in NY · 35120
5100 SUNRISE HWY FL 2, Massapequa Park, NY 11762
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Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Christina Mcmahon Casac-master is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment– Home Health Agency– Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignment

Medicare enrollment records show Christina Mcmahon reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Cs Medical Associates, P.C.
1.5 mi
Counselor
64 BROADWAY
Amityville, NY 11701
  • Reassigned Medicare billing, New York enrollment
  • Medicare enrollment name: Cs Medical Associates, PC
  • 81 clinicians in this Medicare group
NPI 1790653236 (631) 696-4357

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

MICHELLE HEALY
Counselor (Addiction (Substance Use Disorder))
5100 SUNRISE HWY FL 2
MASSAPEQUA PARK, NY 11762
Nassau County (631) 696-4357
SIOBHAN EARECKSON
Peer Specialist
5100 SUNRISE HWY FL 2
MASSAPEQUA PARK, NY 11762
Nassau County (631) 696-4357
ROBERT BLAIR PMHNP, RN
Nurse Practitioner (Psychiatric/Mental Health)
5100 SUNRISE HWY FL 2
MASSAPEQUA PARK, NY 11762
Nassau County (516) 715-1356
BARBARA MARAIA-RENTZ
Counselor (Addiction (Substance Use Disorder))
5100 SUNRISE HWY FL 2
MASSAPEQUA PARK, NY 11762
Nassau County (631) 696-4357
LUCAS WRIGHT
Counselor (Addiction (Substance Use Disorder))
5100 SUNRISE HWY FL 2
MASSAPEQUA PARK, NY 11762
Nassau County (631) 696-4357
ALISON CASTALDY
Peer Specialist
5100 SUNRISE HWY FL 2
MASSAPEQUA PARK, NY 11762
Nassau County (631) 696-4357
BRITTANY TYNAN LMHC
Counselor (Mental Health)
5100 SUNRISE HWY FL 2
MASSAPEQUA PARK, NY 11762
Nassau County (631) 696-4357
LAUREN WILLIAMS
Counselor (Addiction (Substance Use Disorder))
5100 SUNRISE HWY FL 2
MASSAPEQUA PARK, NY 11762
Nassau County (631) 696-4357

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 Christina Mcmahon's NPI number?

The NPI number for Christina Mcmahon is 1598654618. It was assigned to this individual provider in the NPPES registry on July 2, 2025.

Where is Christina Mcmahon located?

Christina Mcmahon practices at 5100 Sunrise Hwy Fl 2, Massapequa Park, NY 11762. The listed phone number is (631) 696-4357.

What is Christina Mcmahon's specialty?

The primary specialty registered for this NPI is Counselor, specializing in Addiction (Substance Use Disorder), with taxonomy code 101YA0400X.

Is Christina Mcmahon enrolled in Medicare?

Yes. Christina Mcmahon is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Christina Mcmahon's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Christina Mcmahon reassigns Medicare benefits to Cs Medical Associates, P.C. (Amityville, NY). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Christina Mcmahon's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Christina Mcmahon was last updated on July 2, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 15 months 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.