Other biomechanical lesions of rib cage

This code signifies a biomechanical dysfunction or impairment affecting the rib cage, not otherwise specified or classified under more specific M99 codes. It indicates a structural or functional abnormality of the ribs, costal cartilages, or associated joints that disrupts normal movement or stability. This can manifest as pain, restricted motion, or altered respiratory mechanics.

Use this code when documentation indicates a "biomechanical lesion of the rib cage" without further specification of the exact type (e.g., somatic dysfunction, segmental dysfunction). It is appropriate for diagnoses such as "rib cage somatic dysfunction, NOS" or "costovertebral joint dysfunction, unspecified." Supporting documentation should clearly state a biomechanical issue of the rib cage.

• Do not use this code if a more specific M99 subcategory (e.g., M99.08, M99.18) can be identified from the documentation.
• Ensure the medical record explicitly states "biomechanical lesion" or a similar term indicating a functional rather than a traumatic or inflammatory condition.
• Consider sequencing this code as a secondary diagnosis if the primary reason for the encounter is a symptom (e.g., chest pain) caused by the rib cage dysfunction.