{"code":"Z85.821","type":"code","title":"Personal history of Merkel cell carcinoma","codeAlso":["any follow-up examination (Z08-Z09)"],"includes":[],"modern_v":"official26","codeFirst":["any follow-up examination after treatment of malignant neoplasm (Z08)"],"excludes1":[],"excludes2":["personal history of benign neoplasm (Z86.01-)","personal history of carcinoma-in-situ (Z86.00-)"],"isBillable":true,"fyEffectivity":{"fy2026":true,"fy2027":true,"billableFy2026":true,"billableFy2027":true},"inclusionTerms":["Conditions classifiable to C4A"],"useAdditionalCode":["code to identify:","alcohol use and dependence (F10.-)","exposure to environmental tobacco smoke (Z77.22)","history of tobacco dependence (Z87.891)","occupational exposure to environmental tobacco smoke (Z57.31)","tobacco dependence (F17.-)","tobacco use (Z72.0)"],"clinicalDefinition":"Personal history of Merkel cell carcinoma is a billable ICD-10-CM diagnosis code (Z85.821). Inclusion terms: Conditions classifiable to C4A. Excludes2 (not included here): personal history of benign neoplasm (Z86.01-); personal history of carcinoma-in-situ (Z86.00-). Code first: any follow-up examination after treatment of malignant neoplasm (Z08). Use additional code: code to identify:; alcohol use and dependence (F10.-); exposure to environmental tobacco smoke (Z77.","officialDefinition":"Personal history of Merkel cell carcinoma is a billable ICD-10-CM diagnosis code (Z85.821). Inclusion terms: Conditions classifiable to C4A. Excludes2 (not included here): personal history of benign neoplasm (Z86.01-); personal history of carcinoma-in-situ (Z86.00-). Code first: any follow-up examination after treatment of malignant neoplasm (Z08). Use additional code: code to identify:; alcohol use and dependence (F10.-); exposure to environmental tobacco smoke (Z77.22); history of tobacco dependence (Z87.891); occupational exposure to environmental tobacco smoke (Z57.31); tobacco dependence (F17.-); tobacco use (Z72.0). Code also: any follow-up examination (Z08-Z09).","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":{"personal history of benign neoplasm (Z86.01-)":"Z85","personal history of carcinoma-in-situ (Z86.00-)":"Z85","any follow-up examination after treatment of malignant neoplasm (Z08)":"Z85","code to identify:":"Z85","alcohol use and dependence (F10.-)":"Z85","exposure to environmental tobacco smoke (Z77.22)":"Z85","history of tobacco dependence (Z87.891)":"Z85","occupational exposure to environmental tobacco smoke (Z57.31)":"Z85","tobacco dependence (F17.-)":"Z85","tobacco use (Z72.0)":"Z85","Conditions classifiable to C00-C14, C40-C49, C69-C75, C7A.098, C76-C79":"Z85.8"},"hcc":{"mapped":false,"model":"CMS-HCC V28","paymentYear":"2026","categories":[],"otherModels":[]}}