Unspecified acquired deformity of unspecified upper arm

This code signifies an acquired structural abnormality of the upper arm where the specific nature of the deformity is not documented. It indicates a deviation from normal form or shape that developed after birth, affecting the humerus or surrounding soft tissues.

Apply this code when the medical record clearly states an acquired deformity of the upper arm but lacks further specificity regarding its type (e.g., "acquired upper arm deformity"). Documentation should indicate the deformity is not congenital and the specific type of deformity is unknown or not recorded.

• Avoid using this code if a more specific acquired deformity of the upper arm (e.g., M21.02- for valgus deformity) is documented.
• Always query the provider for greater specificity if possible to assign a more precise code.
• This code should be a last resort when no other information about the deformity's type is available.