Adhesions and ankylosis of left temporomandibular joint

This code signifies the presence of abnormal fibrous bands (adhesions) and/or the stiffening or fusion (ankylosis) within the left temporomandibular joint (TMJ). These conditions restrict the normal movement and function of the jaw on the affected side.

Use this code when documentation clearly indicates adhesions or ankylosis affecting the patient's left TMJ. This often presents with limited jaw opening, pain, or deviation upon movement. Supporting documentation includes physician notes detailing physical exam findings, imaging reports (e.g., MRI, CT) confirming the presence of adhesions or bony fusion, and patient history of trauma or inflammatory conditions.

• Specify laterality: Ensure documentation clearly indicates the left TMJ. If bilateral, a separate code for the right TMJ (M26.611) or unspecified (M26.619) would be used.
• Distinguish from other TMJ disorders: This code is specific to adhesions and ankylosis; do not use for other TMJ derangements like internal derangement (M26.62-) or degenerative arthritis (M26.63-).
• Look for underlying causes: If the adhesions or ankylosis are secondary to another condition (e.g., trauma, infection), code the underlying condition first, if applicable, followed by this code.