M46.51 Other infective spondylopathies, occipito-atlanto-axial region

Billable ICD-10-CM code, FY2026.

Risk adjustment (HCC)

• CMS-HCC V22: HCC 40 — Rheumatoid Arthritis and Inflammatory Connective Tissue Disease
• ESRD V24: HCC 40

MS-DRG index

Defines the logic of DRG(s) 456-458 in MDC 08.

Approximate ICD-9-CM (GEMs)

• 720.89 Other inflammatory spondylopathies (approximate)

Code annotations containing back-references to M46.51

Back-references to M46

• 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 M46.51

• Spondylopathy › infective NEC › occipito-atlanto-axial region

Nearby codes

• M46.47 Discitis, unspecified, lumbosacral region
• M46.48 Discitis, unspecified, sacral and sacrococcygeal region
• M46.49 Discitis, unspecified, multiple sites in spine
• M46.5 Other infective spondylopathies
• M46.50 Other infective spondylopathies, site unspecified
• M46.51 Other infective spondylopathies, occipito-atlanto-axial region (this code)
• M46.52 Other infective spondylopathies, cervical region
• M46.53 Other infective spondylopathies, cervicothoracic region
• M46.54 Other infective spondylopathies, thoracic region
• M46.55 Other infective spondylopathies, thoracolumbar region
• M46.56 Other infective spondylopathies, lumbar region