Internal derangement of knee

Definition

Internal derangement of the knee (IDK) is a chronic disorder of the knee due to a torn, ruptured or deranged meniscus of the knee, or a partial or complete cruciate rupture, with or without injury to the capsular ligament, resulting in ongoing or intermittent signs and symptoms such as pain, instability, or abnormal mobility of that knee. If indicated that derangement is due to trauma, code to Injury, poisoning and certain other consequences of external causes, regardless of time past since injury.

Exclusions

• Ankylosis of joint (FA34.4)
• Disorders of patella (FA32)
• Injuries to the knee or lower leg
• deformity of knee (FA31)
• recurrent dislocation or subluxation patella (FA32.0)

7 subordinate codes

• FA33.0Cystic meniscus
• FA33.1Discoid meniscus
• FA33.2Derangement of meniscus due to old tear or injury
• FA33.3Loose body in knee
• FA33.4Chronic instability of knee
• 4B4YOther specified diseases of the immune system
• 4B4ZDiseases of the immune system, unspecified

Nearby in Certain specified joint disorders or deformities of limbs

• FA30Acquired deformities of fingers or toes
• FA31Other acquired deformities of limbs
• FA32Disorders of patella
• FA34Certain specified joint derangements
• FA35Wear of articular bearing surface of joint prosthesis
• FA36Effusion of joint
• FA37Certain joint disorders, not elsewhere classified
• FA38Arthropathy in diseases classified elsewhere