M40.3 is the ICD-10 code for Flatback syndrome. It is a four-character subcategory of M40 (Kyphosis and lordosis), the most specific level in the WHO edition. It belongs to the block M40–M43 (Deforming dorsopathies) in Chapter XIII, Diseases of the musculoskeletal system and connective tissue.
- Code type
- Subcategory (4 characters)
- Chapter
- XIII · M00–M99
- Classification
- WHO ICD-10, 2019 version
M40.3 in national editions
Countries report with their own edition of ICD-10. Most keep the WHO code and add more specific codes beneath it.
M40.3Rettrygg-syndrom
- M40.30Rettrygg-syndrom i flere lokalisasjoner i ryggsøylen
- M40.31Rettrygg-syndrom i oksipito-atlanto-aksialregionen
- M40.32Rettrygg-syndrom i cervikalregionen
- M40.33Rettrygg-syndrom i cervikotorakalregionen
- M40.34Rettrygg-syndrom i torakalregionen
- M40.35Rettrygg-syndrom i torakolumbalregionen
- M40.36Rettrygg-syndrom i lumbalregionen
- M40.37Rettrygg-syndrom i lumbosakralregionen
- and 2 more national subcodes
DM403Columna recta
M40.3Lautaselkäoireyhtymä
M40.3Flachrücken
M40.3Syndrome du dos plat
M40.3flat back syndrome [verstreken lordose en kyfose]
Listed through more specific codes:
- M40.30Flatback syndrome, site unspecified
- M40.35Flatback syndrome, thoracolumbar region
- M40.36Flatback syndrome, lumbar region
- M40.37Flatback syndrome, lumbosacral region
Based on the World Health Organization’s International Statistical Classification of Diseases and Related Health Problems, 10th revision (ICD-10), 2019 version, and the national editions published by each country’s health authority. This page is a reference, not coding advice; follow your national coding rules when you report.
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