Final answer:
The ICD-10 code for degenerative joint disease (osteoarthritis) of the left knee is M17.11, which is used for medical diagnoses and billing.
Step-by-step explanation:
The ICD-10 code for degenerative joint disease of the knee, specifically the left knee, is M17.11. This code is used to diagnose osteoarthritis of the knee, which is a common form of arthritis characterized by the wearing down of cartilage. The code M17.11 corresponds to unilateral primary osteoarthritis, left knee. Here, 'unilateral' indicates that only one knee is affected and 'primary' specifies that the osteoarthritis is not due to any injury or other disease. It's crucial to use the correct ICD-10 code for accurate medical diagnosis and billing purposes.