Final answer:
The ICD-10 code for posttraumatic osteoarthritis due to a previous left femoral neck fracture (hip) is M16.11.
Step-by-step explanation:
The ICD-10 code for posttraumatic osteoarthritis due to a previous left femoral neck fracture (hip) is M16.11.
Posttraumatic osteoarthritis refers to arthritis that develops after an injury or trauma to a joint, such as a fracture. M16.11 specifically indicates the left hip joint is affected by the osteoarthritis.