{"code":"M21.942","type":"code","title":"Unspecified acquired deformity of hand, left hand","codeAlso":[],"includes":[],"modern_v":"official26","codeFirst":[],"excludes1":["acquired absence of limb (Z89.-)","congenital absence of limbs (Q71-Q73)","congenital deformities and malformations of limbs (Q65-Q66, Q68-Q74)"],"excludes2":["acquired deformities of fingers or toes (M20.-)","coxa plana (M91.2)","joints of the spine (M40-M54)"],"isBillable":true,"fyEffectivity":{"fy2026":true,"fy2027":true,"billableFy2026":true,"billableFy2027":true},"inclusionTerms":[],"useAdditionalCode":[],"clinicalDefinition":"Unspecified acquired deformity of hand, left hand is a billable ICD-10-CM diagnosis code (M21.942). Excludes1 (not coded here): acquired absence of limb (Z89.-); congenital absence of limbs (Q71-Q73); congenital deformities and malformations of limbs (Q65-Q66, Q68-Q74). Excludes2 (not included here): acquired deformities of fingers or toes (M20.-); coxa plana (M91.2); joints of the spine (M40-M54).","officialDefinition":"Unspecified acquired deformity of hand, left hand is a billable ICD-10-CM diagnosis code (M21.942). Excludes1 (not coded here): acquired absence of limb (Z89.-); congenital absence of limbs (Q71-Q73); congenital deformities and malformations of limbs (Q65-Q66, Q68-Q74). Excludes2 (not included here): acquired deformities of fingers or toes (M20.-); coxa plana (M91.2); joints of the spine (M40-M54).","seventhCharacterInstructions":[],"workflowProtocols":[],"guidelines":{"whenToUse":[],"whenNotToUse":[],"commonBillingMistakes":[],"codeComparisons":[],"documentationChecklist":[]},"domainLandscape":{"summary":"Primary diagnostic domain and clinical landscape evaluation.","keyCategories":[],"diagnosticContinuum":"Progression continuum from acute presentation to resolution."},"children":[],"hierarchy":[],"relatedCodes":[],"relevantCPTCodes":[],"documentationTips":[],"caseStudies":[],"description":"","overview":"","noteProvenance":{"acquired absence of limb (Z89.-)":"M21","congenital absence of limbs (Q71-Q73)":"M21","congenital deformities and malformations of limbs (Q65-Q66, Q68-Q74)":"M21","acquired deformities of fingers or toes (M20.-)":"M21","coxa plana (M91.2)":"M21","joints of the spine (M40-M54)":"M21"},"hcc":{"mapped":false,"model":"CMS-HCC V28","paymentYear":"2026","categories":[],"otherModels":[]}}