ICD-10-CM 2027
ICD-10 code for inflammatory spondylopathy
From the official ICD-10-CM alphabetic index entry “Spondylopathy › inflammatory”. Page updated September 29, 2026.
About coding inflammatory spondylopathy
The ICD-10-CM code for inflammatory spondylopathy is M46.90 (Unspecified inflammatory spondylopathy, site unspecified). The official index lists 19 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on M46.90.
Within M46.9, choose M46.90 (site unspecified) only when documentation doesn't support a more specific option: occipito-atlanto-axial region (M46.91), cervical region (M46.92), cervicothoracic region (M46.93), thoracic region (M46.94), thoracolumbar region (M46.95), lumbar region (M46.96), lumbosacral region (M46.97), sacral and sacrococcygeal region (M46.98) and 1 more.
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 551 (Medical Back Problems with MCC, relative weight 1.6358) and DRG 552 (Medical Back Problems without MCC, relative weight 0.9584), in MDC 08 (Diseases and Disorders of the Musculoskeletal System and Connective Tissue), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
More specific inflammatory spondylopathy codes (official index)
- cervical region M46.92 — Unspecified inflammatory spondylopathy, cervical region
- cervicothoracic region M46.93 — Unspecified inflammatory spondylopathy, cervicothoracic region
- lumbar region M46.96 — Unspecified inflammatory spondylopathy, lumbar region
- lumbosacral region M46.97 — Unspecified inflammatory spondylopathy, lumbosacral region
- multiple sites M46.99 — Unspecified inflammatory spondylopathy, multiple sites in spine
- occipito-atlanto-axial region M46.91 — Unspecified inflammatory spondylopathy, occipito-atlanto-axial region
- sacrococcygeal region M46.98 — Unspecified inflammatory spondylopathy, sacral and sacrococcygeal region
- specified type NEC M46.80 — Other specified inflammatory spondylopathies, site unspecified
- cervical region M46.82 — Other specified inflammatory spondylopathies, cervical region
- cervicothoracic region M46.83 — Other specified inflammatory spondylopathies, cervicothoracic region
- lumbar region M46.86 — Other specified inflammatory spondylopathies, lumbar region
- lumbosacral region M46.87 — Other specified inflammatory spondylopathies, lumbosacral region
- multiple sites M46.89 — Other specified inflammatory spondylopathies, multiple sites in spine
- occipito-atlanto-axial region M46.81 — Other specified inflammatory spondylopathies, occipito-atlanto-axial region
- sacrococcygeal region M46.88 — Other specified inflammatory spondylopathies, sacral and sacrococcygeal region
- thoracic region M46.84 — Other specified inflammatory spondylopathies, thoracic region
- thoracolumbar region M46.85 — Other specified inflammatory spondylopathies, thoracolumbar region
- thoracic region M46.94 — Unspecified inflammatory spondylopathy, thoracic region
- thoracolumbar region M46.95 — Unspecified inflammatory spondylopathy, thoracolumbar region
Common questions about inflammatory spondylopathy ICD-10 codes
What is the ICD-10 code for inflammatory spondylopathy?
- M46.90 — Unspecified inflammatory spondylopathy, site unspecified. More specific codes apply when the documentation supports them: M46.92, M46.93, M46.96, M46.97 and others below.
What is the ICD-10 code for cervical region inflammatory spondylopathy?
- M46.92 — Unspecified inflammatory spondylopathy, cervical region.
What is the ICD-10 code for cervicothoracic region inflammatory spondylopathy?
- M46.93 — Unspecified inflammatory spondylopathy, cervicothoracic region.
What is the ICD-10 code for lumbar region inflammatory spondylopathy?
- M46.96 — Unspecified inflammatory spondylopathy, lumbar region.
What is the ICD-10 code for lumbosacral region inflammatory spondylopathy?
- M46.97 — Unspecified inflammatory spondylopathy, lumbosacral region.
What is the ICD-10 code for multiple sites inflammatory spondylopathy?
- M46.99 — Unspecified inflammatory spondylopathy, multiple sites in spine.
What is the ICD-10 code for occipito-atlanto-axial region inflammatory spondylopathy?
- M46.91 — Unspecified inflammatory spondylopathy, occipito-atlanto-axial region.
Is M46.90 billable?
- Yes. M46.90 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can M46.90 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict M46.90 as a principal diagnosis.
Is M46.90 a CC or MCC?
- No. M46.90 is neither a CC nor an MCC under MS-DRG v44.0.