Ankylosing spondylitis of cervicothoracic region

This code signifies a chronic, inflammatory autoimmune disease primarily affecting the spine, specifically localized to the cervical and thoracic segments. It involves inflammation of the vertebrae and sacroiliac joints, leading to progressive stiffness and potential fusion (ankylosis) of the spinal segments in the neck and upper back.

Use this code when documentation clearly indicates a diagnosis of ankylosing spondylitis with specific involvement of the cervicothoracic spine. This diagnosis is typically supported by imaging studies (e.g., X-rays, MRI showing sacroiliitis or spinal changes), clinical symptoms like chronic back pain and stiffness, and positive inflammatory markers.

• Ensure the documentation explicitly states involvement of the "cervicothoracic region" or both "cervical" and "thoracic" spine.
• Do not use this code if the ankylosing spondylitis is generalized or affects only other spinal regions; more specific codes exist for those presentations.
• Consider sequencing this code as the primary diagnosis if it is the main reason for the encounter, especially for management of this specific spinal involvement.