A patient falls at home and is admitted with a closed intertrochanteric fracture of the right femur, which is treated with open reduction and internal fixation. She also has type 2 diabetes and essential hypertension, both managed with her home medications. What is the principal diagnosis?
Show answer & explanation
Answer: C
Type 2 diabetes mellitus: Diabetes is a chronic comorbidity that was treated during the stay, so it is a secondary diagnosis, not the reason for admission.
Essential hypertension: Hypertension is also a managed comorbidity and is coded as a secondary diagnosis.
Intertrochanteric fracture of the right femur: Correct. Under UHDDS, the principal diagnosis is the condition established after study to be chiefly responsible for the admission: the hip fracture.
The fall at home (external cause): External cause codes describe how an injury happened and can never be sequenced as the principal diagnosis.
Principal diagnosis = the condition, after study, chiefly responsible for occasioning the admission. External cause codes are always secondary.