Stress fracture, left finger(s), subs for fx w nonunion

This diagnosis code indicates a stress fracture affecting one or more fingers of the left hand. The "subsequent encounter" designation means the patient is receiving routine care during the healing phase of the fracture, but the fracture has failed to unite properly.

Apply this code when documentation specifies a left finger stress fracture that is not healing as expected, indicating a nonunion. This is used for follow-up visits where the patient is still under active treatment for the nonunion, such as casting, physical therapy, or preparation for surgical intervention.

• Ensure documentation clearly states "stress fracture" and specifies the left finger(s).
• Verify that the encounter is for follow-up care of a nonunion, not initial treatment or a healed fracture.
• Distinguish from malunion (M84.345P), which implies healing in an unsatisfactory position, rather than a failure to heal.