M08.979
ICD-10-CMThis code signifies a diagnosis of juvenile arthritis where the specific type of arthritis is not documented, and the affected joint is an unspecified ankle or foot. It indicates a chronic inflammatory condition affecting joints in individuals under 16 years of age, without further specification of the disease subtype or laterality of the ankle/foot involvement.
This code is appropriate when the medical record clearly states a diagnosis of juvenile arthritis affecting the ankle or foot, but lacks details regarding the specific subtype (e.g., oligoarticular, polyarticular, systemic) or whether it's the right, left, or bilateral ankle/foot. Documentation supporting its use would include physician notes indicating "juvenile arthritis of ankle/foot, type unspecified" or similar phrasing.
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