Nocturnal Hemodialysis
Nocturnal hemodialysis is dialysis performed either at home or in a dialysis facility while the patient is sleeping. It is a longer and slower form of hemodialysis that can be >5 hours per treatment, 3 to 7 days a week.
To report nocturnal hemodialysis, you must append modifier UJ (services provided at night) to the dialysis code on the dialysis revenue code line.
Reference