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MARISSA O'CONNOR
NPI 1386286896
Social Worker in Deer Park, NY

Active since October 16, 2019PECOS Enrolled
770 GRAND BLVD STE 17, DEER PARK, NY 11729(516) 361-3576(631) 392-4358 Get Directions Write a Review

NPPES record last updated: October 16, 2019. Verified against the NPPES registry weekly; last sync: November 08, 2026.

About Marissa O'connor NPPES

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

MARISSA O'CONNOR (NPI 1386286896) is an individual social worker in Deer Park, New York and active in the NPI registry since October 2019. She is enrolled in Medicare PECOS and maintains a secondary practice location in Lindenhurst.

NPPES Registry Identity

NPI1386286896
Entity TypeIndividualFemale
Primary Taxonomy104100000X
Provider Legal NameMARISSA O'CONNOR
Location Address770 GRAND BLVD STE 17Deer Park, NY 11729-5725
Mailing Address30 Tremont RdLindenhurst, NY 11757-1734 · (516) 361-3576
Phone(516) 361-3576
Fax(631) 392-4358
Sole ProprietorYes
Enumeration DateOctober 16, 2019
✔ NPI 1386286896 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtySocial WorkerBehavioral Health & Social Service Providers
Taxonomy Code104100000X
Definition
A social worker is a person who is qualified by a Social Work degree, and licensed, certified or registered by the state as a social worker to practice within the scope of that license. A social worker provides assistance and counseling to clients and their families who are dealing with social, emotional and environmental problems. Social work services may be rendered to individuals, families, groups, and the public.
770 GRAND BLVD STE 17, Deer Park, NY 11729
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Secondary Practice Location 1

Location 130 Tremont RdLindenhurst, NY 11757-1734 · Phone (516) 361-3576

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Marissa O'connor 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 Reassignments

2

Medicare enrollment records show Marissa O'connor reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

North Shore Health System Medical Faculty Group Practice Inc
20 mi
Hematology & Oncology
450 LAKEVILLE RD
New Hyde Park, NY 11042
  • Reassigned Medicare billing, New York enrollment
  • 198 clinicians in this Medicare group
NPI 1003409061 (516) 734-8900
North Shore-Lij Medical PC
21 mi
Urology
1010 NORTHERN BLVD STE 110
Great Neck, NY 11021
  • Reassigned Medicare billing, New York enrollment
  • 9,353 clinicians in this Medicare group
NPI 1053688572 (516) 321-7400

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 11

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

WILFREDO MALE CORREA CRPA
Counselor (Addiction (Substance Use Disorder))
770 GRAND BLVD STE 17
DEER PARK, NY 11729
Suffolk County (631) 392-4357
SARAH ELIZABETH MOYER LMSW
Social Worker (Clinical)
770 GRAND BLVD STE 17
DEER PARK, NY 11729
Suffolk County (585) 362-1939
ADAM FRIEDMAN CASAC-T
Counselor (Addiction (Substance Use Disorder))
770 GRAND BLVD STE 17
DEER PARK, NY 11729
Suffolk County (631) 392-4357
BRIANNA SANTELLA MORANO CASAC-T
Counselor (Addiction (Substance Use Disorder))
770 GRAND BLVD STE 17
DEER PARK, NY 11729
Suffolk County (631) 392-4357
MRS. MARY ALICE DOWLING NP
Nurse Practitioner (Psychiatric/Mental Health)
770 GRAND BLVD STE 17
DEER PARK, NY 11729
Suffolk County (631) 392-4357
KAYLA EDWARDS BSW
Social Worker (Clinical)
770 GRAND BLVD STE 17
DEER PARK, NY 11729
Suffolk County (631) 392-4357
KIMBERLY ANN NAPOLITANO CASAC CRPA CARC
Counselor (Addiction (Substance Use Disorder))
770 GRAND BLVD STE 17
DEER PARK, NY 11729
Suffolk County (631) 449-4363
WILLIAM GALLAGHER CASAC-T, CRPA
Counselor (Addiction (Substance Use Disorder))
770 GRAND BLVD STE 17
DEER PARK, NY 11729
Suffolk County (631) 919-7294

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 Marissa O'connor's NPI number?

The NPI number for Marissa O'connor is 1386286896. It was assigned to this individual provider in the NPPES registry on October 16, 2019.

Where is Marissa O'connor located?

Marissa O'connor practices at 770 Grand Blvd Ste 17, Deer Park, NY 11729. The listed phone number is (516) 361-3576.

What is Marissa O'connor's specialty?

The primary specialty registered for this NPI is Social Worker with taxonomy code 104100000X.

Is Marissa O'connor enrolled in Medicare?

Yes. Marissa O'connor is registered in the Medicare PECOS enrollment system.

Which organizations bill Medicare for Marissa O'connor's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Marissa O'connor reassigns Medicare benefits to 2 organizations: North Shore Health System Medical Faculty Group Practice Inc (New Hyde Park, NY) and North Shore-Lij Medical PC (Great Neck, NY). Each 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 Marissa O'connor'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 Marissa O'connor was last updated on October 16, 2019. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 7 years 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.