M21.6 is the ICD-10 code for Other acquired deformities of ankle and foot. It is a four-character subcategory of M21 (Other acquired deformities of limbs), the most specific level in the WHO edition. It belongs to the block M20–M25 (Other joint disorders) 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
What M21.6 excludes
Conditions that look similar but belong under another code.
- deformities of toe (acquired) M20.1-M20.6
M21.6 in national editions
Countries report with their own edition of ICD-10. Most keep the WHO code and add more specific codes beneath it.
M21.6Annen ervervet deformitet i ankel eller fot
DM216Anden erhvervet deformitet af ankel eller fod
- DM216HPes calcaneo-valgus acquisitus
- DM216IPes cavus acquisitus
- DM216JPes calcaneus acquisitus
- DM216KPes transverso-planus
- DM216LPes metatarso-varus acquisitus
- DM216MPes plano-valgus acquisitus
- DM216NPes excavatus acquisitus
- DM216OPes valgus acquisitus
- and 1 more national subcodes
M21.6Muu nilkan ja jalkaterän hankinnainen epämuotoisuus
M21.6Sonstige erworbene Deformitäten des Knöchels und des Fußes
- M21.60Erworbener Hohlfuß [Pes cavus]
- M21.61Erworbener Knick-Plattfuß [Pes planovalgus]
- M21.62Erworbener Spitzfuß [Pes equinus]
- M21.63Erworbener Spreizfuß
- M21.68Sonstige erworbene Deformitäten des Knöchels und des Fußes
M21.6Autres déformations de la cheville et du pied
M21.6overige verworven misvormingen van enkel en voet
Listed through more specific codes:
- M21.611Bunion of right foot
- M21.612Bunion of left foot
- M21.619Bunion of unspecified foot
- M21.621Bunionette of right foot
- M21.622Bunionette of left foot
- M21.629Bunionette of unspecified foot
- M21.6X1Other acquired deformities of right foot
- M21.6X2Other acquired deformities of left foot
- and 1 more national subcodes
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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