Ankylosing spondylitis of thoracic region

This code signifies a chronic inflammatory arthropathy primarily affecting the axial skeleton, specifically localized to the thoracic spine. It is characterized by progressive stiffness and pain due to inflammation and eventual fusion of the vertebrae in the mid-back region. This condition can lead to significant postural changes and impaired mobility.

Apply this code when documentation confirms a diagnosis of ankylosing spondylitis with the primary or most significant involvement noted in the thoracic spine. This diagnosis is typically supported by imaging studies (e.g., X-rays, MRI showing sacroiliitis and syndesmophytes in the thoracic spine) and clinical findings consistent with inflammatory back pain.

• Ensure documentation clearly specifies "thoracic region" to differentiate from other spinal segments.
• Consider sequencing this code as the primary diagnosis when thoracic involvement is the main reason for the encounter.
• Do not confuse with other forms of spondylopathy or non-inflammatory back pain; look for explicit mention of ankylosing spondylitis.