M21 (Other acquired deformities of limbs) is an umbrella ICD-10-CM medical diagnosis code in the Diseases of the musculoskeletal system and connective tissue chapter. It identifies cases of other acquired deformities of limbs for clinical documentation, billing and epidemiological tracking.

ICD-10-CM · Category

M21 — Other acquired deformities of limbs

Chapter M00-M99: Diseases of the musculoskeletal system and connective tissue

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Sub-codes under M21

M21.0Valgus deformity, not elsewhere classifiedM21.1Varus deformity, not elsewhere classifiedM21.2Flexion deformityM21.3Wrist or foot drop (acquired)M21.4Flat foot [pes planus] (acquired)M21.5Acquired clawhand, clubhand, clawfoot and clubfootM21.6Other acquired deformities of footM21.7Unequal limb length (acquired)M21.8Other specified acquired deformities of limbsM21.9Unspecified acquired deformity of limb and hand

Common questions about M21 (Other acquired deformities of limbs)

What does ICD-10 code M21 mean?
M21 is the ICD-10-CM 2025 code for Other acquired deformities of limbs. ICD-10-CM is the medical coding system used by clinicians, hospitals and insurers worldwide to classify diseases and conditions in a standard way.
Is M21 a billable diagnosis code?
M21 is a category-level (umbrella) code rather than a billable specific code. For billing purposes, clinicians typically use a more specific sub-code under M21. Browse the sub-codes listed on this page.
Which ICD-10 chapter does M21 belong to?
M21 belongs to the chapter "Diseases of the musculoskeletal system and connective tissue" (codes M00-M99). ICD-10-CM organises codes into 22 chapters by body system or condition type, which helps clinicians navigate related diagnoses.
Where can I get plain-language information about Other acquired deformities of limbs?
For a plain-language explanation of Other acquired deformities of limbs, ask GoDavaii's Health AI - it explains medical conditions in 22+ Indian languages, free, with no signup. Tap "Ask GoDavaii AI about Other acquired deformities of limbs" above to get a personalised answer.

Source: ICD-10-CM 2025 (Centers for Medicare & Medicaid Services, public domain). Codes valid from October 1, 2024. CMS source ↗