M48.11 Ankylosing hyperostosis [Forestier], occipito-atlanto-axial region

Billable ICD-10-CM code, FY2026.

Applies from M48.1 Ankylosing hyperostosis [Forestier]

Applicable to

• Diffuse idiopathic skeletal hyperostosis [DISH]

MS-DRG index

Defines the logic of DRG(s) 551-552 in MDC 08.

Approximate ICD-9-CM (GEMs)

• 721.6 Ankylosing vertebral hyperostosis (approximate)

Code annotations containing back-references to M48.11

Back-references to M48.1

• Type 1 Excludes: M85.8 Other specified disorders of bone density and structure ("diffuse idiopathic skeletal hyperostosis [DISH] (M48.1)")

Back-references to M48

• Type 1 Excludes: G55 Nerve root and plexus compressions in diseases classified elsewhere ("nerve root compression (due to) (in) spondylopathies (M46.-, M48.-)")

Diagnosis Index entries for M48.11

• Hyperostosis (monomelic) › ankylosing (spine) › occipito-atlanto-axial region

Nearby codes

• M48.062 Spinal stenosis, lumbar region with neurogenic claudication
• M48.07 Spinal stenosis, lumbosacral region
• M48.08 Spinal stenosis, sacral and sacrococcygeal region
• M48.1 Ankylosing hyperostosis [Forestier]
• M48.10 Ankylosing hyperostosis [Forestier], site unspecified
• M48.11 Ankylosing hyperostosis [Forestier], occipito-atlanto-axial region (this code)
• M48.12 Ankylosing hyperostosis [Forestier], cervical region
• M48.13 Ankylosing hyperostosis [Forestier], cervicothoracic region
• M48.14 Ankylosing hyperostosis [Forestier], thoracic region
• M48.15 Ankylosing hyperostosis [Forestier], thoracolumbar region
• M48.16 Ankylosing hyperostosis [Forestier], lumbar region