Monday, October 19, 2026

ICD-10-CM code S52.609D describes an unspecified fracture of the lower end of an unspecified ulna during a subsequent encounter for a closed fracture with routine healing. While it offers a complete coding pathway for follow-up care, relying on double-unspecified documentation is a magnet for claim denials. A seventh character D confirms the patient is receiving routine healing care after active treatment, but unspecified laterality and anatomical details severely weaken the clinical picture. Mastering the 7th character extensions and demanding site specificity in provider notes is key to keeping these claims compliant.