{"code":"C13.1","type":"code","title":"Malignant neoplasm of aryepiglottic fold, hypopharyngeal aspect","codeAlso":[],"includes":[],"modern_v":"official26","codeFirst":[],"excludes1":[],"excludes2":["malignant neoplasm of aryepiglottic fold or interarytenoid fold, laryngeal aspect (C32.1)","malignant neoplasm of pyriform sinus (C12)"],"isBillable":true,"fyEffectivity":{"fy2026":true,"fy2027":true,"billableFy2026":true,"billableFy2027":true},"sibling_codes":["C13","C13.0","C13.2","C13.8","C13.9"],"inclusionTerms":["Malignant neoplasm of aryepiglottic fold, marginal zone","Malignant neoplasm of aryepiglottic fold NOS","Malignant neoplasm of interarytenoid fold, marginal zone","Malignant neoplasm of interarytenoid fold NOS"],"sibling_titles":{"code":"C13.9","title":"Malignant neoplasm of hypopharynx, unspecified","isBillable":true},"useAdditionalCode":["code to identify:","exposure to environmental tobacco smoke (Z77.22)","exposure to tobacco smoke in the perinatal period (P96.81)","history of tobacco dependence (Z87.891)","occupational exposure to environmental tobacco smoke (Z57.31)","tobacco dependence (F17.-)","tobacco use (Z72.0)"],"clinicalDefinition":"Malignant neoplasm of aryepiglottic fold, hypopharyngeal aspect is a billable ICD-10-CM diagnosis code (C13.1). Inclusion terms: Malignant neoplasm of aryepiglottic fold, marginal zone; Malignant neoplasm of aryepiglottic fold NOS; Malignant neoplasm of interarytenoid fold, marginal zone; Malignant neoplasm of interarytenoid fold NOS. Excludes2 (not included here): malignant neoplasm of aryepiglottic fold or interarytenoid fold, laryngeal aspect (C32.","officialDefinition":"Malignant neoplasm of aryepiglottic fold, hypopharyngeal aspect is a billable ICD-10-CM diagnosis code (C13.1). Inclusion terms: Malignant neoplasm of aryepiglottic fold, marginal zone; Malignant neoplasm of aryepiglottic fold NOS; Malignant neoplasm of interarytenoid fold, marginal zone; Malignant neoplasm of interarytenoid fold NOS. Excludes2 (not included here): malignant neoplasm of aryepiglottic fold or interarytenoid fold, laryngeal aspect (C32.1); malignant neoplasm of pyriform sinus (C12). Use additional code: code to identify:; exposure to environmental tobacco smoke (Z77.22); exposure to tobacco smoke in the perinatal period (P96.81); history of tobacco dependence (Z87.891); occupational exposure to environmental tobacco smoke (Z57.31); tobacco dependence (F17.-); tobacco use (Z72.0).","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":""}