ICD-10-CM 2027
ICD-10 code for ankylosing spine hyperostosis
From the official ICD-10-CM alphabetic index entry “Hyperostosis (monomelic) › ankylosing (spine)”. Page updated September 29, 2026.
About coding ankylosing spine hyperostosis
The ICD-10-CM code for ankylosing spine hyperostosis is M48.10 (Ankylosing hyperostosis [Forestier], site unspecified). The official index lists 9 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on M48.10.
Within M48.1, choose M48.10 (site unspecified) only when documentation doesn't support a more specific option: occipito-atlanto-axial region (M48.11), cervical region (M48.12), cervicothoracic region (M48.13), thoracic region (M48.14), thoracolumbar region (M48.15), lumbar region (M48.16), lumbosacral region (M48.17), sacral and sacrococcygeal region (M48.18) 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 ankylosing spine hyperostosis codes (official index)
- cervical region M48.12 — Ankylosing hyperostosis [Forestier], cervical region
- cervicothoracic region M48.13 — Ankylosing hyperostosis [Forestier], cervicothoracic region
- lumbar region M48.16 — Ankylosing hyperostosis [Forestier], lumbar region
- lumbosacral region M48.17 — Ankylosing hyperostosis [Forestier], lumbosacral region
- multiple sites M48.19 — Ankylosing hyperostosis [Forestier], multiple sites in spine
- occipito-atlanto-axial region M48.11 — Ankylosing hyperostosis [Forestier], occipito-atlanto-axial region
- sacrococcygeal region M48.18 — Ankylosing hyperostosis [Forestier], sacral and sacrococcygeal region
- thoracic region M48.14 — Ankylosing hyperostosis [Forestier], thoracic region
- thoracolumbar region M48.15 — Ankylosing hyperostosis [Forestier], thoracolumbar region
Common questions about ankylosing spine hyperostosis ICD-10 codes
What is the ICD-10 code for ankylosing spine hyperostosis?
- M48.10 — Ankylosing hyperostosis [Forestier], site unspecified. More specific codes apply when the documentation supports them: M48.12, M48.13, M48.16, M48.17 and others below.
What is the ICD-10 code for cervical region ankylosing spine hyperostosis?
- M48.12 — Ankylosing hyperostosis [Forestier], cervical region.
What is the ICD-10 code for cervicothoracic region ankylosing spine hyperostosis?
- M48.13 — Ankylosing hyperostosis [Forestier], cervicothoracic region.
What is the ICD-10 code for lumbar region ankylosing spine hyperostosis?
- M48.16 — Ankylosing hyperostosis [Forestier], lumbar region.
What is the ICD-10 code for lumbosacral region ankylosing spine hyperostosis?
- M48.17 — Ankylosing hyperostosis [Forestier], lumbosacral region.
What is the ICD-10 code for multiple sites ankylosing spine hyperostosis?
- M48.19 — Ankylosing hyperostosis [Forestier], multiple sites in spine.
What is the ICD-10 code for occipito-atlanto-axial region ankylosing spine hyperostosis?
- M48.11 — Ankylosing hyperostosis [Forestier], occipito-atlanto-axial region.
Is M48.10 billable?
- Yes. M48.10 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can M48.10 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict M48.10 as a principal diagnosis.
Is M48.10 a CC or MCC?
- No. M48.10 is neither a CC nor an MCC under MS-DRG v44.0.