Secondary osteoarthritis, unspecified ankle and foot

This code represents degenerative joint disease of the ankle or foot that develops as a consequence of another underlying condition, such as trauma, infection, or a congenital deformity. It signifies that the osteoarthritis is not primary (idiopathic) but rather secondary to an identifiable cause affecting the joint. The specific ankle or foot joint involved is not documented.

Use this code when documentation clearly states secondary osteoarthritis affecting an unspecified ankle or foot, and the underlying cause is known but not explicitly linked to a specific joint. This code is appropriate when the provider has diagnosed secondary osteoarthritis but has not specified whether it affects the right or left ankle/foot, or a more precise anatomical location within the foot. Supporting documentation would include imaging reports confirming degenerative changes and a history or diagnosis of a predisposing condition.

• Always attempt to obtain laterality (right/left) and a more specific anatomical site (e.g., ankle, tarsal, metatarsal) if documented, as more specific codes exist.
• Code the underlying cause of the secondary osteoarthritis first, if known and applicable, following ICD-10-CM sequencing guidelines.
• Avoid using this code if the documentation specifies primary osteoarthritis or if the laterality and specific joint are clearly indicated.