Northwell Health Headquarters Address, Corporate Office Location, and Contact Details

About

Northwell Health is New York State’s largest healthcare provider and private employer — a nonprofit integrated health system headquartered at 2000 Marcus Avenue, Lake Success, New York (ZIP 11042). Northwell relocated to this 100,000 sq ft campus in 2016 on a 30-year lease; its secondary Manhattan administrative office is at 130 East 59th Street. Founded in 1997 as the North Shore-Long Island Jewish Health System and rebranded to Northwell Health in 2016, the organization operates 28 hospitals, 1,000+ outpatient facilities, and 16,000+ affiliated physicians with a workforce of more than 105,000 — generating $18.6 billion in FY2024 operating revenue.

In May 2025, Northwell announced that President and CEO Michael Dowling — who led the organization for 23+ years since January 2002 — would step down effective October 1, 2025. Mark Solazzo serves as Executive Vice President and COO. Note: many directories list the HQ city as “New Hyde Park, NY 11042” — the correct incorporated municipality for 2000 Marcus Avenue is Lake Success, an independent village in Nassau County; both designations share ZIP 11042.

Quick Facts

Legal Name

Northwell Health, Inc. (nonprofit 501(c)(3))

Founded

1997 (rebranded from North Shore-LIJ to Northwell Health in 2016)

HQ

2000 Marcus Avenue, Lake Success, NY 11042

Manhattan Admin Office

130 East 59th Street, New York, NY 10022

FY2024 Operating Revenue

$18.6 billion

Hospitals

Outpatient Facilities

1,000+

Physicians

16,000+

Employees

105,000+

Former CEO

Michael Dowling (stepped down October 1, 2025)

EVP & COO

Mark Solazzo

What Brings You Here? Find the Right Contact

Schedule an appointment

Call 1-888-321-3627 (1-888-321-DOCS) — Mon–Fri 9am–5pm EST, or online at northwell.edu.

Billing inquiry / medical bill

Call 1-888-214-4065 (billing info) or 1-888-214-4066 (billing assistance). Always request a full itemized bill before disputing any charge — billing code errors are common and many can be corrected directly by the billing team.

Patient complaint / grievance

Contact the Patient Advocate or Patient Relations office at your specific Northwell facility first — federal CMS rules and NY law require every hospital to have a formal grievance process with a written response within 7–30 days.

Compliance / ethics / HIPAA (anonymous)

Call 1-800-894-3226 — anonymous reporting accepted for fraud, waste, HIPAA violations, and misconduct.

Ambulance billing

Call 1-833-259-2367.

Legal / subpoena

Serve Northwell Health, Inc. (New York nonprofit corporation) at 2000 Marcus Avenue, Lake Success, NY 11042.

Phone Directory

Appointments

1-888-321-3627

Billing Info

1-888-214-4065

Medical Billing Assistance

1-888-214-4066

Compliance / Ethics (Anonymous)

1-800-894-3226

Ambulance Billing

1-833-259-2367

Corporate HQ

(516) 321-6100

NYS DOH Patient Complaints

1-800-804-5447

NYS OPMC (Provider Misconduct)

1-800-663-6114

The Joint Commission

1-800-994-6610

HIPAA / HHS OCR

1-800-368-1019

Corporate Headquarters Address

Northwell Health, Inc.

2000 Marcus Avenue
Lake Success, NY 11042

Manhattan Administrative Office

130 East 59th Street, New York, NY 10022

How to Escalate a Complaint

Start with the facility’s Patient Advocate. Federal CMS law requires a formal written response within 7–30 days. Get the grievance number — you’ll need it for all further escalations.
Contact Northwell’s Office of Patient Experience at 2000 Marcus Avenue, Lake Success, NY 11042 for system-level escalations beyond the individual facility.
Request an itemized bill for all billing disputes — your right under NY law and CMS regulations. Northwell’s team at 1-888-214-4066 can correct coding errors once identified.
File with the NYS Department of Health at 1-800-804-5447 or health.ny.gov — the DOH has direct regulatory authority over all Northwell hospitals and triggers on-site investigations for serious quality issues.
File with The Joint Commission at jointcommission.org or 1-800-994-6610 for patient safety and care quality concerns.
File with HHS Office for Civil Rights at hhs.gov/ocr or 1-800-368-1019 for HIPAA violations.
File with CMS at cms.gov or 1-800-MEDICARE for Medicare/Medicaid billing fraud; also with the HHS OIG at oig.hhs.gov/hotline.html.
Contact the NYS Attorney General at ag.ny.gov or 1-800-771-7755 — the MFCU handles Medicaid billing fraud; the Charities Bureau has oversight over nonprofit hospital practices.
File with OPMC at 1-800-663-6114 for professional misconduct complaints against any Northwell physician or licensed provider.