Among the proud achievements of Nonthavej Hospital over the years include the following:

- JCI accreditation since June 2011 until present and first hospital in northern Bangkok to achieve the recognition
- Certification at 2nd Re-Accreditation Survey in 2017
- HA and HPH (Hospital Accreditation) certificate from the Healthcare Accreditation Institute
- ISO 15189:2012, ISO 15190 and GMP/HACCP (Good Manufacturing Practice/Hazard Analysis and Critical Control Point) certificates for medical laboratories
- Good Practice of Endometriosis accreditation from HA, in cooperation with Thai Life Insurance Co., Ltd. Under the “Good Practice” project
- First hospital in Thailand certified for ISO 50001 Energy Management by URS (United Registrar of Systems) Thailand Limited - proof of its dedication to energy management and environment sustainability
- Best Customer Satisfaction award from Muang Thai Life Insurance 
Hospital Award 2015
- Platinum Award Hospital Quality in 2009, 2011, and 2014 from American International Insurance (AIA) Company Limited
- Service Award in 2008-2009 from Ayutthya Alliance C.P. Company Limited voted by Ayutthya Alliance customers
- The only hospital to win the Honor Award for three consecutive years in 2005, 2006 and 2007 from BUPA Good Provider Award.