The South Korean Nationwide Well being Insurance coverage scheme has lacked ample protection scope (companies coated) and depth (prices coated) because it achieved nationwide protection in 1989. The federal government carried out two separate welfare plans (2004-08 and 2009-12) to enhance the monetary Safety of Nationwide Well being Insurance coverage by primarily specializing in prices coated. The third plan (initiated in 2013) was probably the most complete, addressing each scope and depth. We evaluated the influence of this profit growth coverage for 4 classes of main illness (most cancers, cardiac illness, cerebrovascular illness, and uncommon illnesses) on catastrophic well being expenditures, impoverishment, and unmet want. Utilizing 2012–17 Korean Well being Panel Survey information, we carried out difference-in-differences analyzes and triple-difference analyzes to look at the differential influence of coverage throughout revenue teams. The coverage diminished catastrophic well being expenditures amongst beneficiary households throughout nearly all post-policy years. Nonetheless, there was no common impact on lowering family impairment or unmet want. The coverage had combined results by revenue however didn’t usually favor low-income households. To offer stronger monetary safety, the coverage should tackle points past increasing protection, resembling supplier fee construction. As well as, particular coverage measures for low-income households should be adopted.