Familial chondrocalcinosis, unspecified knee

This diagnosis code signifies a genetic disorder characterized by the deposition of calcium pyrophosphate dihydrate crystals within the cartilage of the knee joint, leading to inflammation and degenerative changes. It specifically indicates that the familial form of chondrocalcinosis is present, but the laterality (left or right knee) has not been specified in the medical record.

Use this code when documentation confirms a diagnosis of familial chondrocalcinosis affecting the knee, and the specific knee involved is not documented. This typically occurs when a patient presents with symptoms such as knee pain, swelling, and stiffness, and diagnostic imaging (e.g., X-ray showing chondrocalcinosis) along with a family history supports the familial etiology.

• Ensure the documentation explicitly states "familial" chondrocalcinosis to differentiate from idiopathic or secondary forms.
• If the laterality of the affected knee is documented (e.g., right or left), a more specific code should be selected.
• This code should be sequenced as a primary diagnosis when it is the reason for the encounter, or as a secondary diagnosis if it is a co-morbidity impacting treatment.