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​About Us​​​​​​​

​​About NSO

About NSO 

Nurses Service Organization (NSO) is the nation's largest provider of nurses professional liability insurance coverage, with over 550,000 nursing professionals insured in the program today. 

Through our extensive research of the nursing community, we are able to provide quality products and services at competitive rates, as well as develop other products that best meet the needs of all nursing professionals. With the NSO Nurses Advisory Board’s direct feedback, we are able to identify and address key issues within the nursing community through our newsletter, the NSO Risk Advisor. All customers receive a complimentary subscription. This newsletter provides risk management tips specifically for nurses, nurse practitioners, and nursing students. 

NSO is a registered trade name of Affinity Insurance Services, Inc., a subsidiary of Aon Corporation. Aon plc (NYSE:AON) is the leading global provider of risk management, insurance and reinsurance brokerage, and human resources solutions and outsourcing services. Through its more than 66,000 colleagues worldwide, Aon unites to empower results for clients in over 120 countries via innovative and effective risk and people solutions and through industry-leading global resources and technical expertise. Aon has been named repeatedly as the world’s best broker, best insurance intermediary, best reinsurance intermediary, best captives manager, and best employee benefits consulting firm by multiple industry sources. Visit for more information on Aon and to learn about Aon’s global partnership with Manchester United

Our site offers more than professional liability insurance products. We also offer relevant professional liability and risk management content to help nursing professionals like you learn about risks that can make you vulnerable to medical malpractice lawsuits. 

Affinity Insurance Services, Inc.'s administrative offices are located at: 

159 E. County Line Road 
Hatboro, PA 19040-1218 

Please click here​ to view our privacy statement. 


Call 1-800-247-1500

Mon – Fri, 8am – 6pm ET.
NSO Advisory Board
For more information on the NSO Advisory Board, click here. ​​