ICD-10-CM > N00-N99 > N17-N19 > N18 > N18.3 N18.3 Chronic kidney disease, stage 3 (moderate) Non-Billable/Non-Specific Codes N18.30Chronic kidney disease, stage 3 unspecifiedN18.31Chronic kidney disease, stage 3aN18.32Chronic kidney disease, stage 3b