Any nephronophthisis in which the cause of the disease is a mutation in the NPHP4 gene. The disease is nephronophthisis 4 (MONDO_0011752). Also known as: NPHP4, NPHP4 nephronophthisis (disease), juvenile nephronophthisis 4, nephronophthisis (disease) caused by mutation in NPHP4, nephronophthisis type 4.