M47.021 Vertebral artery compression syndromes, occipito-atlanto-axial region

Billable ICD-10-CM code, FY2026. Acts as a Complication or Comorbidity (CC) as a secondary diagnosis.

Applies from M47 Spondylosis

Includes

• arthrosis or osteoarthritis of spine
• degeneration of facet joints

MS-DRG index

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

Approximate ICD-9-CM (GEMs)

• 721.1 Cervical spondylosis with myelopathy (approximate)

Code annotations containing back-references to M47.021

Back-references to M47.0

• Type 1 Excludes: G55 Nerve root and plexus compressions in diseases classified elsewhere ("nerve root compression (due to) (in) spondylosis (M47.0-, M47.2.-)")
• Type 1 Excludes: G99.2 Myelopathy in diseases classified elsewhere ("spondylosis (M47.0-, M47.1-)")

Back-references to M47

• Type 1 Excludes: G54 Nerve root and plexus disorders ("spondylosis (M47.-)")
• Type 2 Excludes: M19 Other and unspecified osteoarthritis ("arthrosis of spine (M47.-)")
• Type 2 Excludes: M19 Other and unspecified osteoarthritis ("osteoarthritis of spine (M47.-)")

Diagnosis Index entries for M47.021

• Syndrome › compression › vertebral artery › occipito-atlanto-axial region

Nearby codes

• M47.014 Anterior spinal artery compression syndromes, thoracic region
• M47.015 Anterior spinal artery compression syndromes, thoracolumbar region
• M47.016 Anterior spinal artery compression syndromes, lumbar region
• M47.019 Anterior spinal artery compression syndromes, site unspecified
• M47.02 Vertebral artery compression syndromes
• M47.021 Vertebral artery compression syndromes, occipito-atlanto-axial region (this code)
• M47.022 Vertebral artery compression syndromes, cervical region
• M47.029 Vertebral artery compression syndromes, site unspecified
• M47.1 Other spondylosis with myelopathy
• M47.10 Other spondylosis with myelopathy, site unspecified
• M47.11 Other spondylosis with myelopathy, occipito-atlanto-axial region