Other chondrocalcinosis, left knee

This code signifies the presence of calcium pyrophosphate dihydrate (CPPD) crystal deposition in the cartilage of the left knee, leading to inflammation and degenerative changes. It represents a form of crystal arthropathy distinct from gout, characterized by the accumulation of these specific crystals within joint tissues.

Apply this code when documentation explicitly states chondrocalcinosis affecting the left knee, without further specification of a primary or secondary cause. This diagnosis is often supported by imaging findings (e.g., X-rays showing chondrocalcinosis) and/or aspiration of synovial fluid revealing CPPD crystals.

• Ensure laterality is clearly documented as "left knee" to support this specific code.
• Distinguish from gout (M10.-) and other arthropathies; chondrocalcinosis is a distinct crystal deposition disease.
• If the chondrocalcinosis is secondary to a metabolic or endocrine disorder, code the underlying condition first, followed by this code.