Limited mandibular range of motion

This code signifies a restricted ability to move the lower jaw through its full normal range. This limitation can affect opening, closing, or lateral movements of the mandible, often leading to difficulty with chewing, speaking, or yawning. It indicates a functional impairment of the temporomandibular joint (TMJ) or associated musculature.

Use this code when documentation explicitly states a limited range of motion of the mandible, often measured in millimeters for opening or degrees for lateral excursions. This diagnosis is appropriate for conditions such as trismus, TMJ internal derangement with restricted movement, or post-surgical fibrosis affecting jaw mobility. Supporting documentation should include objective measurements or a clear clinical assessment of reduced mandibular movement.

• Differentiate from M26.50 (unspecified) and M26.59 (other specified) by ensuring the documentation specifically states "limited range of motion."
• Always look for an underlying cause (e.g., TMJ disorder, trauma, infection) and code it as a primary diagnosis if applicable, with this code as a secondary.
• Ensure the documentation specifies the mandible; do not use for generalized facial or oral cavity movement limitations.