Marianna Zara Grennan, LCSW R - Medicare Clinical Social Worker in Melville, NY

Marianna Zara Grennan, LCSW R is a medicare enrolled "Social Worker - Clinical" provider in Melville, New York. She graduated from medical school in 1997 and has 27 years of diverse experience with area of expertise as Clinical Social Worker. She is a member of the group practice Che Senior Psychological Services, Pc and her current practice location is 900 Walt Whitman Road, Suite 300, Melville, New York. You can reach out to her office (for appointments etc.) via phone at (631) 271-5617.

Marianna Zara Grennan is licensed to practice in New York (license number R049385) and she also participates in the medicare program. She accepts medicare assignments (which means she accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance) and her NPI Number is 1013188390.

Contact Information

Marianna Zara Grennan, LCSW R
900 Walt Whitman Road, Suite 300,
Melville, NY 11747
(631) 271-5617
(631) 385-1776

Map and Direction




Healthcare Provider's Profile

Full NameMarianna Zara Grennan
GenderFemale
SpecialityClinical Social Worker
Experience27 Years
Location900 Walt Whitman Road, Melville, New York
Accepts Medicare AssignmentsYes. She accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance.
  Medical Education and Training:
  • Marianna Zara Grennan graduated from medical school in 1997
  NPI Data:
  • NPI Number: 1013188390
  • Provider Enumeration Date: 03/14/2008
  • Last Update Date: 03/14/2008
  Medicare PECOS Information:
  • PECOS PAC ID: 2264852995
  • Enrollment ID: I20201020000680

Medical Identifiers

Medical identifiers for Marianna Zara Grennan such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1013188390NPI-NPPES

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
1041C0700XSocial Worker - Clinical R049385 (New York)Primary

Group Practice Association

Group Practice NameGroup PECOS PAC IDNo. of Members
Che Senior Psychological Services, Pc8022905314123

Medicare Reassignments

Some practitioners may not bill the customers directly but medicare billing happens through clinics / group practice / hospitals where the provider works. Medicare reassignment of benefits is a mechanism by which practitioners allow third parties to bill and receive payment for medicare services performed by them. Marianna Zara Grennan allows following entities to bill medicare on her behalf.
Entity NameChe Senior Psychological Services, Pc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1023078219
PECOS PAC ID: 8022905314
Enrollment ID: O20040322001429
Entity NamePsychological Health Services Pc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1043248776
PECOS PAC ID: 1153212998
Enrollment ID: O20040322001760

Medicare Part D Prescriber Enrollment

Any physician or other eligible professional who prescribes Part D drugs must either enroll in the Medicare program or opt out in order to prescribe drugs to their patients with Part D prescription drug benefit plans. Marianna Zara Grennan is enrolled with medicare and thus, if eligible, can prescribe medicare part D drugs to patients with medicare part D benefits.

Mailing Address and Practice Location

Mailing AddressPractice Location Address
Marianna Zara Grennan, LCSW R
11 Windham Drive,
South Huntington, NY 11746

Ph: (631) 271-5617
Marianna Zara Grennan, LCSW R
900 Walt Whitman Road, Suite 300,
Melville, NY 11747

Ph: (631) 271-5617

Reviews and Comments


Social Worker in Melville, NY

Elissa Friedman, LCSW
Clinical Social Worker
Medicare: Accepting Medicare Assignments
Practice Location: 900 Walt Whitman Rd Ste Ll1, Melville, NY 11747
Phone: 516-698-5511    
Livia Dubinsky,
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Phone: 631-848-9961    
Mella Clancy-schifilliti, LCSW
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Medicare: Accepting Medicare Assignments
Practice Location: 150 Broadhollow Rd, Suite 310, Melville, NY 11747
Phone: 917-940-9980    
Mrs. Susan Gail Zola, LCSW
Clinical Social Worker
Medicare: Not Enrolled in Medicare
Practice Location: 276 Altessa Blvd., Melville, NY 11747
Phone: 631-332-2213    
Joanne Graziosi, LCSW
Clinical Social Worker
Medicare: Accepting Medicare Assignments
Practice Location: 900 Walt Whitman Rd Ste Ll1, Melville, NY 11747
Phone: 516-698-5511    
Elizabeth P Balzer, LCSW
Clinical Social Worker
Medicare: Medicare Enrolled
Practice Location: 900 Walt Whitman Rd Ste Ll1, Melville, NY 11747
Phone: 516-698-5511    Fax: 516-418-5377

Medicare Program: Medicare is a federal government program which provides health insurance to people who are 65 or older. This program also covers certain younger people with disabilities (who receive Social Security Disability Insurance - SSDI), and people with End-Stage Renal Disease (permanent kidney failure requiring dialysis or a transplant, sometimes called ESRD.

Medicare Assignment: Assignment means that your doctor, provider, or supplier agrees (or is required by law) to accept the Medicare-approved amount as full payment for covered services. Most doctors, providers, and suppliers accept assignment, but you should always check to make sure. Participating providers have signed an agreement to accept assignment for all Medicare-covered services.

NPI Number: The National Provider Identifier (NPI) is a unique identification number for covered health care providers. The NPI must be used in lieu of legacy provider identifiers in the HIPAA standards transactions. Covered health care providers and all health plans and health care clearinghouses must use the NPIs in the administrative and financial transactions adopted under HIPAA (Health Insurance Portability and Accountability Act).

Our Data: Information on www.medicarelist.com is built using data sources published by Centers for Medicare & Medicaid Services (CMS) under Freedom of Information Act (FOIA). The information disclosed on the NPI Registry are FOIA-disclosable and are required to be disclosed under the FOIA and the eFOIA amendments to the FOIA. There is no way to 'opt out' or 'suppress' the NPPES record data for health care providers with active NPIs.