NordDRG grouping logic is based on primary classifications (ICD-10 and NCSP), the use of which is defined by national coding guidelines. The guidelines for each NordDRG user country are found on national websites, which can be reached via the links below:
Estonia:
https://tervisekassa.ee/partnerile/raviasutusele/tervishoiuteenuste-loetelu/juhendid
Iceland:
https://island.is/flokkunarkerfi-i-heilbrigdisthjonustu
Latvia:
https://ssk10.spkc.gov.lv/rsc/SSK_2_sejums_20190922.pdf
Sweden:
https://www.socialstyrelsen.se/statistik-och-data/klassifikationer-och-koder/icd-10/