| Full description | Ankylosing hyperostosis [Forestier], sacral and sacrococcygeal region |
| Billable | Yes |
| Chapter | Chapter 13: Diseases of the musculoskeletal system and connective tissue (M00-M99) |
| Section | Spondylopathies (M45-M49) |
| Parent code | M48.1 — Ankylosing hyperostosis [Forestier] |