Question: A 35-year-old male patient came into the podiatrist’s office complaining of pain in his left ankle. His history indicates that he broke the ankle 18 years earlier while playing high-school football. My podiatrist determines that the patient has post-traumatic osteoarthritis of the left ankle. Which ICD-10-CM code should I report for this condition? Florida Subscriber Answer: You should report M19.172 (Post-traumatic osteoarthritis, left ankle and foot). Post-traumatic osteoarthritis defined: In post-traumatic osteoarthritis, physical injuries cause damage to the cartilage and bone in a joint, altering the joint’s function. Common symptoms of post-traumatic osteoarthritis include fluid buildup inside the joint cavity, along with chronic pain and swelling.