Ankylosing spondylitis lumbar region

This code identifies a chronic, inflammatory autoimmune disease primarily affecting the sacroiliac joints and spine, specifically localized to the lumbar region. It is characterized by progressive stiffness and fusion of vertebrae, leading to pain and reduced spinal mobility.

Apply this code when documentation clearly indicates a diagnosis of ankylosing spondylitis with the primary or most significant manifestation in the lumbar spine. This diagnosis is typically supported by imaging findings (e.g., X-rays, MRI showing sacroiliitis or syndesmophytes) and clinical symptoms like chronic low back pain and morning stiffness.

• Ensure documentation specifies the lumbar region; otherwise, use a more general ankylosing spondylitis code.
• Do not confuse with other forms of spondylopathy or inflammatory arthropathies without explicit ankylosing spondylitis diagnosis.
• Code any associated complications or manifestations (e.g., uveitis, inflammatory bowel disease) separately.