Specific code 2012 ICD-9-CM Diagnosis Code 721.6
Ankylosing vertebral hyperostosis
  • Short description: Ankyl vert hyperostosis.
  • ICD-9-CM 721.6 will be replaced by an equivalent ICD-10-CM code (or codes) when the United States transitions from ICD-9-CM to ICD-10-CM on October 1, 2015.
  • ICD-9-CM 721.6 is a billable medical code that can be used to specify a diagnosis on a reimbursement claim.
  • You are viewing the 2012 version of ICD-9-CM 721.6.
  • More recent version(s) of ICD-9-CM 721.6: 2013 2014.
Disease Synonyms
  • Ankylosing hyperostosis of cervical (neck) spine
  • Ankylosing hyperostosis of cervical spine
  • Ankylosing hyperostosis of cervicothoracic spine
  • Ankylosing hyperostosis of lumbar spine
  • Ankylosing hyperostosis of lumbosacral spine
  • Ankylosing hyperostosis of multiple sites in spine
  • Ankylosing hyperostosis of occipito-atlanto-axial
  • Ankylosing hyperostosis of sacral and sacrococcygeal
  • Ankylosing hyperostosis of the cervical spine
  • Ankylosing hyperostosis of thoracic spine
  • Ankylosing hyperostosis of thoracolumbar spine
  • Ankylosing hyperostosis of vertebra
  • Diffuse idiopathic skeletal hyperostosis of cervicothoracic spine
  • Diffuse idiopathic skeletal hyperostosis of lumbar spine
  • Diffuse idiopathic skeletal hyperostosis of lumbosacral spine
  • Diffuse idiopathic skeletal hyperostosis of multiple sites of spine
  • Diffuse idiopathic skeletal hyperostosis of occipitoatlantoaxial spine
  • Diffuse idiopathic skeletal hyperostosis of sacral and sacrococcygeal spine
  • Diffuse idiopathic skeletal hyperostosis of thoracic spine
  • Diffuse idiopathic skeletal hyperostosis of thoracolumbar spine
  • Disseminated idiopathic skeletal hyperostosis
Convert to ICD-10-CM: 721.6 converts approximately to:
  • 2014 ICD-10-CM M48.10 Ankylosing hyperostosis [Forestier], site unspecified
ICD-9-CM Volume 2 Index entries containing back-references to 721.6:
  • Hyperostosis 733.99
    • vertebral 721.8
      • with spondylosis - see Spondylosis
      • ankylosing 721.6
  • Spondylitis 720.9
    • ossificans ligamentosa 721.6
ICD-9-CM codes are used in medical billing and coding to describe diseases, injuries, symptoms and conditions. ICD-9-CM 721.6 is one of thousands of ICD-9-CM codes used in healthcare. Although ICD-9-CM and CPT codes are largely numeric, they differ in that CPT codes describe medical procedures and services. Can't find a code? Start at the root of ICD-9-CM, check the 2012 ICD-9-CM Index or use the search engine at the top of this page to lookup any code.