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ICD-10 CM Code M43.21

M43.21 Fusion of spine, occipito-atlanto-axial region

Inclusion Term

Excludes Type 1

ankylosing spondylitis (M45.0-)
congenital fusion of spine (Q76.4)
congenital spondylolysis and spondylolisthesis (Q76.2)
hemivertebra (Q76.3-Q76.4)
Klippel-Feil syndrome (Q76.1)
lumbarization and sacralization (Q76.4)
platyspondylisis (Q76.4)
spina bifida occulta (Q76.0)
spinal curvature in osteoporosis (M80.-)
spinal curvature in Paget's disease of bone [osteitis deformans] (M88.-)

Excludes Type 2