ICD-10-CM > N00-N99 > N10-N16 > N11 > N11.0 N11.0 Nonobstructive reflux-associated chronic pyelonephritis Billable/Specific Copy Code Copy Description Applicable To Pyelonephritis (chronic) associated with (vesicoureteral) reflux Type 1 Excludes vesicoureteral reflux NOS (N13.70)