Home > 2015 ICD-9-CM Diagnosis Codes > Diseases Of The Musculoskeletal System And Connective Tissue 710-739 > Dorsopathies 720-724 > Spondylosis and allied disorders 721-
Specific code 2015 ICD-9-CM Diagnosis Code 721.6
Ankylosing vertebral hyperostosis
  • 2015
  • Billable Thru Sept 30/2015
  • Non-Billable On/After Oct 1/2015

  • ICD-9-CM 721.6 is a billable medical code that can be used to indicate a diagnosis on a reimbursement claim, however, 721.6 should only be used for claims with a date of service on or before September 30, 2015. For claims with a date of service on or after October 1, 2015, use an equivalent ICD-10-CM code (or codes).
Convert to ICD-10-CM: 721.6 converts approximately to:
  • 2015/16 ICD-10-CM M48.10 Ankylosing hyperostosis [Forestier], site unspecified
Approximate 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
  • Ankylosing hyperostosis, sacral and sacrococcygeal
  • 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
Clinical Information
  • A disease of elderly men characterized by large osteophytes that bridge vertebrae and ossification of ligaments and tendon insertions
  • A rare degenerative disorder that affects the spine. It is characterized by ossification of ligaments resulting in calcifications along the sides of the spinal vertebrae
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
 721.5 ICD9Data.com 721.7 
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 2015 ICD-9-CM Index or use the search engine at the top of this page to lookup any code.
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