M21 is the ICD-10 code for Other acquired deformities of limbs. It is a three-character category divided into 10 subcodes; use the subcode whenever the record supports that level of detail. It belongs to the block M20–M25 (Other joint disorders) in Chapter XIII, Diseases of the musculoskeletal system and connective tissue.
- Code type
- Category (3 characters)
- Chapter
- XIII · M00–M99
- Classification
- WHO ICD-10, 2019 version
What M21 excludes
Conditions that look similar but belong under another code.
Subcodes of M21
- M21.0Valgus deformity, not elsewhere classified
- M21.1Varus deformity, not elsewhere classified
- M21.2Flexion deformity
- M21.3Wrist or foot drop (acquired)
- M21.4Flat foot [pes planus] (acquired)
- M21.5Acquired clawhand, clubhand, clawfoot and clubfoot
- M21.6Other acquired deformities of ankle and foot
- M21.7Unequal limb length (acquired)
- M21.8Other specified acquired deformities of limbs
- M21.9Acquired deformity of limb, unspecified
M21 in national editions
Countries report with their own edition of ICD-10. Most keep the WHO code and add more specific codes beneath it.
DM21Andre erhvervede deformiteter af arme og ben
M21Muut hankinnaiset raajojen epämuotoisuudet
M21Sonstige erworbene Deformitäten der Extremitäten
M21Autres déformations des membres
M21overige verworven misvormingen van extremiteiten
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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