Deviation in opening and closing of the mandible

This code signifies an abnormal movement pattern of the lower jaw during opening and closing, often indicative of temporomandibular joint (TMJ) dysfunction or muscular imbalance. This deviation can manifest as a "C" or "S" curve during mandibular excursion, or a sudden shift from the midline.

Apply this code when documentation specifies a deviation in mandibular movement, such as a "mandibular deviation to the left upon opening" or "S-curve deviation during jaw movement." This is typically observed during a clinical examination for TMJ disorders, facial pain, or malocclusion. Supporting documentation should clearly describe the abnormal path of the mandible.

• Differentiate from M26.50 (Unspecified anomalies of jaw position) and M26.59 (Other anomalies of jaw position) when a specific deviation is noted.
• Consider co-reporting with other TMJ disorder codes (e.g., M26.6x for TMJ disorders) if the deviation is a symptom of a broader condition.
• Ensure the provider's documentation explicitly describes the deviation, not just general TMJ pain.