Marissa Mccay, MD - Medicare Internal Medicine in West Harrison, NY

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Marissa Mccay, MD is a medicare enrolled "Internal Medicine - Sports Medicine" physician in West Harrison, New York. Her current practice location is 1111 Westchester Ave, West Harrison, New York. You can reach out to her office (for appointments etc.) via phone at (212) 305-9137.

Marissa Mccay is licensed to practice in New York (license number 325177) and she also participates in the medicare program. She does not accept medicare assignments directly but she may accept medicare through third-party (refer to Reassignment section below) and may also prescribe medicare part D drugs. Her NPI Number is 1972922441.

Contact Information

Marissa Mccay, MD
1111 Westchester Ave,
West Harrison, NY 10604-3525
(212) 305-9137
(212) 304-7050

Map and Direction




Physician's Profile

Full NameMarissa Mccay
GenderFemale
SpecialityInternal Medicine - Sports Medicine
Location1111 Westchester Ave, West Harrison, New York
Accepts Medicare AssignmentsMedicare enrolled and may accept medicare through third-party reassignment. May prescribe medicare part D drugs.
  NPI Data:
  • NPI Number: 1972922441
  • Provider Enumeration Date: 04/14/2014
  • Last Update Date: 10/16/2025
  Medicare PECOS Information:
  • PECOS PAC ID: 3678796133
  • Enrollment ID: I20240325001633

Medical Identifiers

Medical identifiers for Marissa Mccay such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1972922441NPI-NPPES

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207RS0010XInternal Medicine - Sports Medicine 325177 (New York)Primary

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. Marissa Mccay allows following entities to bill medicare on her behalf.
Entity NameWestchester Health Medical Pc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1386188647
PECOS PAC ID: 7315221751
Enrollment ID: O20170316000446

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. Marissa Mccay 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
Marissa Mccay, MD
622 W 168th St Ph 111130,
New York, NY 10032-3720

Ph: (212) 305-9137		Marissa Mccay, MD
1111 Westchester Ave,
West Harrison, NY 10604-3525

Ph: (212) 305-9137

Reviews and Comments


Internal Medicine Doctors in West Harrison, NY

Dr. Elizabeth S Won, MD
Internal Medicine
Medicare: Medicare Enrolled
Practice Location: 500 Westchester Ave, West Harrison, NY 10604
Phone: 646-888-5113    
Dr. Ross Eliott Mazo, M.D
Internal Medicine
Medicare: May Accept Medicare Assignments
Practice Location: 210 Westchester Ave, West Harrison, NY 10604
Phone: 914-681-3100    
Dr. Michael Stevenson May, MD
Internal Medicine
Medicare: May Accept Medicare Assignments
Practice Location: 500 Westchester Ave, West Harrison, NY 10604
Phone: 917-608-3250    
Dr. Alice A Zervoudakis, M.D.
Internal Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 500 Westchester Ave, West Harrison, NY 10604
Phone: 917-367-7000    
Fernando Costa Santini, M.D.
Internal Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 500 Westchester Ave, West Harrison, NY 10604
Phone: 914-367-7000    
Mili Shum,
Internal Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 222 Westchester Ave, West Harrison, NY 10604
Phone: 914-493-7585    
Dr. Gurneet Singh Bedi, M.D.
Internal Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 2 Westchester Park Dr Ste L-1, West Harrison, NY 10604
Phone: 914-683-1555    Fax: 914-683-1026

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.