Spondyloarthritis Pediatric Rheumatology Terminology Cellosaurus Disease Terminology mCode Terminology mCode Elixhauser Rheumatoid Arthritis and Collagen Vascular Disease Value Set Rheumatologic Disorder Autoimmune Disease Ankylosing Spondylitis Disease or Syndrome Cellosaurus Ankylosing Spondylitis C84564 An immune-mediated disease characterized by inflammation in the axial skeleton including sacroiliac joints, vertebrae and vertebral joints. Peripheral joints may be involved as well. Clinical features can include low back pain and stiffness, limited motion of the lumbar spine, and limited chest expansion. C0038013 An autoimmune chronic inflammatory disorder characterized by inflammation in the vertebral joints of the spine and sacroiliac joints. It predominantly affects young males. Patients present with stiffness and pain in the spine. Ankylosing Spondylitis Ankylosing spondylitis of unspecified sites in spine mCode NICHD NICHD Terminology