Table 1 Outcome variables.

From: An observational claims data analysis on the risk of maternal chronic kidney disease after preterm delivery and preeclampsia

Category

ICD codes

OPS codes

“mild to moderate CKD”

N18.1, N18.2, N18.3, N18.81, N18.82, N18.83

 

“severe CKD”

N18.0, N18.4, N18.5, N18.84, Z49.1, Z49.2, Z94.0, Z99.2

5-555, 8-853, 8-854, 8-855, 8-857

“general CKD”

N19, N18.8, N18.80, N18.9, N18.1, N18.2, N18.3, N18.81, N18.82, N18.83, N18.0, N18.4, N18.5, N18.84, Z49.1, Z49.2, Z94.0, Z99.2

5-555, 8-853, 8-854, 8-855, 8-857

  1. Change of ICD code N18.- in 2010; both versions of ICD coding for CKD (before and after 2010) were used for the analyses.
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