In addition to the operations under the provisions of the National Health Insurance Act, an NHI federation performs the operations of examination and payment of claims for expenses required for benefits for medical treatment provided based on entrustment from an Association of Medical Care Systems for the Elderly Aged 75 and older pursuant to the provisions of Article 70, paragraph (4) (including as applied mutatis mutandis pursuant to Article 74, paragraph (10), Article 75, paragraph (7), Article 76, paragraph (7), and Article 78, paragraph (8)), as well as dietary treatment expenses for inpatients, living support expenses for inpatients, medical expenses combined with treatment outside insurance coverage, and medical expenses for home-nursing.
国保連合会は、国民健康保険法の規定による業務のほか、第七十条第四項（第七十四条第十項、第七十五条第七項、第七十六条第七項及び第七十八条第八項において準用する場合を含む。）の規定により後期高齢者医療広域連合から委託を受けて行う療養の給付に要する費用並びに入院時食事療養費、入院時生活療養費、保険外併用療養費及び訪問看護療養費の請求に関する審査及び支払の業務を行う。