Problem
The patient is a 75-year-old man who fell while going down the stairs at his house. The patient heard a pop and immediately felt pain and was thus unable to straighten his left knee. X-rays confirmed the patient had suffered a quadriceps tendon rupture. (Be sure to include the external cause and place of occurrence codes to fully describe the scenario). What is the Principal Diagnosis? And what are the three ICD-10-CM codes that should be reported?