{"code":"C31.2","type":"code","title":"Malignant neoplasm of frontal sinus","codeAlso":[],"includes":["malignant neoplasm of middle ear"],"modern_v":"official26","codeFirst":[],"excludes1":["mesothelioma (C45.-)"],"excludes2":[],"isBillable":true,"fyEffectivity":{"fy2026":true,"fy2027":true,"billableFy2026":true,"billableFy2027":true},"sibling_codes":["C31","C31.0","C31.1","C31.3","C31.8","C31.9"],"inclusionTerms":[],"sibling_titles":{"code":"C31.9","title":"Malignant neoplasm of accessory sinus, unspecified","isBillable":true},"useAdditionalCode":[],"clinicalDefinition":"Malignant neoplasm of frontal sinus is a billable ICD-10-CM diagnosis code (C31.2). Includes: malignant neoplasm of middle ear. Excludes1 (not coded here): mesothelioma (C45.-).","officialDefinition":"Malignant neoplasm of frontal sinus is a billable ICD-10-CM diagnosis code (C31.2). Includes: malignant neoplasm of middle ear. Excludes1 (not coded here): mesothelioma (C45.-).","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":""}