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MARIANNA ZARA GRENNAN LCSW R
NPI 1013188390
Social Worker - Clinical in Melville, NY

Active since March 14, 2008PECOS Enrolled
900 WALT WHITMAN ROAD, SUITE 300, MELVILLE, NY 11747(631) 271-5617(631) 385-1776 Get Directions Write a Review

NPPES record last updated: March 14, 2008. Verified against the NPPES registry weekly; last sync: August 02, 2026.

About Marianna Zara Grennan Lcsw R NPPES

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

MARIANNA ZARA GRENNAN LCSW R (NPI 1013188390) is an individual clinical provider in Melville, New York, licensed in New York (R049385) and active in the NPI registry since March 2008. She is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1013188390
Entity TypeIndividualFemale
Primary Taxonomy1041C0700X
Provider Legal NameMARIANNA ZARA GRENNANCredential: LCSW R
Location Address900 WALT WHITMAN ROAD, SUITE 300Melville, NY 11747
Mailing Address11 Windham DriveSouth Huntington, NY 11746 · (631) 271-5617 · Fax (631) 385-1776
Phone(631) 271-5617
Fax(631) 385-1776
Sole ProprietorYes
Enumeration DateMarch 14, 2008
✔ NPI 1013188390 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtySocial Worker · ClinicalBehavioral Health & Social Service Providers
Taxonomy Code1041C0700X
License✔ Licensed in NY · R049385
Definition
A social worker who holds a master's or doctoral degree in social work from an accredited school of social work in addition to at least two years of post-master's supervised experience in a clinical setting. The social worker must be licensed, certified, or registered at the clinical level in the jurisdiction of practice. A clinical social worker provides direct services, including interventions focused on interpersonal interactions, intrapsychic dynamics, and life management issues. Clinical social work services are based on bio-psychosocial perspectives. Services consist of assessment, diagnosis, treatment (including psychotherapy and counseling), client-centered advocacy, consultation, evaluation, and prevention of mental illness, emotional, or behavioral disturbances.
900 WALT WHITMAN ROAD, Melville, NY 11747
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Other Names 1

Professional Name (2)Marianna Zara Lcsw

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Providence Health Plan.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Marianna Zara Grennan Lcsw R 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.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 11747 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$0.00 typical visit price
range $67.40 – $203.53
Typical copayment $0.00 (range $16.85 – $50.88)
Most-billed visit code NA
Established Patient
$83.44 typical visit price
range $21.66 – $164.45
Typical copayment $20.86 (range $5.41 – $41.11)
Most-billed visit code 99213
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 3

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

LANDING MEADOWS MENTAL HEALTH COUNSELING PLLC
Counselor (Mental Health)
900 WALT WHITMAN ROAD, SUITE LL 4
MELVILLE, NY 11747
Suffolk County (631) 350-2719
DR. CHARLES JOSEPH CANCELLIERI D.C.
Chiropractor
900 WALT WHITMAN ROAD, (SUITE 100)
MELVILLE, NY 11747
Suffolk County (631) 673-6464
DR. CRAIG R GROBMAN D.O.
Internal Medicine
900 WALT WHITMAN ROAD, #205
MELVILLE, NY 11747
Suffolk County (516) 817-6423

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 Marianna Grennan's NPI number?

The NPI number for Marianna Grennan is 1013188390. It was assigned to this individual provider in the NPPES registry on March 14, 2008. The provider is also known as Marianna Zara Lcsw.

Where is Marianna Grennan located?

Marianna Grennan practices at 900 Walt Whitman Road Suite 300, Melville, NY 11747. The listed phone number is (631) 271-5617.

What is Marianna Grennan's specialty?

The primary specialty registered for this NPI is Social Worker, specializing in Clinical, with taxonomy code 1041C0700X.

Is Marianna Grennan enrolled in Medicare?

Yes. Marianna Grennan is registered in the Medicare PECOS enrollment system.

What insurance does Marianna Grennan accept?

Health plans from Providence Health Plan list Marianna Grennan as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

When was this NPI record last updated?

The NPPES record for Marianna Grennan was last updated on March 14, 2008. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 18 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.