Msk Nassau

Group Practice·97 providers

1101 HEMPSTEAD TPKE, Uniondale, NY 115531112

12 Specialties

14 Insurance Plans

Contact Msk Nassau

(212) 639-2000 Get Directions

1101 HEMPSTEAD TPKE, Uniondale, NY 115531112

Providers

Locations

Specialties

Insurance Plans

About Msk Nassau

Background and practice information

Msk Nassau is a established group medical practice based in Uniondale, NY, with 97 affiliated healthcare providers.

The practice brings together providers across multiple specialties, including nurse practitioner, medical oncology, hematology/oncology, and physician assistant. Its providers are in-network with 14 insurance plans, though coverage varies by individual provider and should be confirmed before scheduling.

Across its providers, the practice has a strong average Merit-based Incentive Payment System (MIPS) score of 88.8 out of 100, a quality measure published by the Centers for Medicare & Medicaid Services.

Practice Locations

1 location

Msk NassauPrimary

1101 HEMPSTEAD TPKE, Uniondale, NY 115531112

(212) 639-2000

Affiliations

Hospitals where providers at Msk Nassau hold admitting privileges

Nyu Langone Hospitals · New York, NY3 providers Suny/stony Brook University Hospital · Stony Brook, NY2 providers New York-presbyterian Hospital · New York, NY2 providers Mercy Medical Center · Rockville Centre, NY1 provider White Plains Hospital Center · White Plains, NY1 provider Norwalk Hospital · Norwalk, CT1 provider Cleveland Clinic · Cleveland, OH1 provider Mary Hitchcock Memorial Hospital · Lebanon, NH1 provider

Insurance Networks

Accepted insurance plans and networks

Msk Nassau accepts 82 plans from 9 insurers, including Cigna, Aetna, UnitedHealthcare.

Cigna

In-NetworkView all Cigna doctors in Uniondale, NY →

Az Localflex Excl Ebh And Pathwell

Az Localflex Incl Ebh And Pathwell

Az Localflex Incl Ebh Excl Pathwell

Chc Of New York Njpcp

Healthpartners Qualified Network

Localplus

Localplus Exclude Ebh With Pathwell

Localplus Sar

Localplus With Ebh Plus Pathwell

Metro New York GppoPPO

Metro Ny Seamless Hmo NetworkHMO

Mvp Mohawk Valley Physicians

National OapOAP

National PpoPPO

National Ppo Sar 1PPO

National Ppo Sar IiPPO

Nj Oap Garden StateOAP

Oap Shared Admin RepricingOAP

Pathwell OapOAP

Pathwell PpoPPO

Priority Health Alliance

Source: CMS Transparency in Coverage filings (March 2026). Network participation may change — verify with the provider's office before scheduling.

Quality & Performance

88.8average MIPS quality score (out of 100) across 74 scored providers, per CMS data

Documentation of Current Medications in the Medical Record99%★★★★☆

Advance Care Plan98%★★★★☆

Preventive Care and Screening: Tobacco Use: Screening and Cessation Intervention81%★★★★☆

Preventive Care and Screening: Influenza Immunization74%★★★☆☆

Breast Cancer Screening46%★★★☆☆

Percentage of Patients Who Died from Cancer Admitted to Hospice for Less than 3 days (lower score better)16%

Specialties at Msk Nassau

Provider specialties represented at this practice

Nurse Practitioner35 providers

Medical Oncology14 providers

Hematology/oncology6 providers

Physician Assistant6 providers

Surgical Oncology5 providers

Internal Medicine5 providers

Urology3 providers

Neurology3 providers

Gynecological Oncology2 providers

Orthopedic Surgery2 providers

Colorectal Surgery (proctology)2 providers

Plastic And Reconstructive Surgery2 providers

Healthcare Providers

97 providers practice here

Aron Legler, MD

Anesthesiology · Telehealth

Uniondale, NY

Chi Yeung

Clinical Psychologist · Telehealth

Uniondale, NY

Mohammad Ali Abbass, MD

Colorectal Surgery (proctology) · Telehealth

Uniondale, NY

Maria Castano, MD

Colorectal Surgery (proctology) · Telehealth

Uniondale, NY

Andreana Kwon, MD

Emergency Medicine · Telehealth

Uniondale, NY

Tracy Ann Moo, MD

General Surgery

Uniondale, NY

Carol Brown, MD

Gynecological Oncology

Uniondale, NY

Aaron Praiss, MD

Gynecological Oncology

Uniondale, NY

Jie Chi, MD