{"code":"K66.9","type":"code","title":"Disorder of peritoneum, unspecified","codeAlso":[],"includes":[],"modern_v":"official26","codeFirst":[],"excludes1":[],"excludes2":["ascites (R18.-)","peritoneal effusion (chronic) (R18.8)"],"isBillable":true,"fyEffectivity":{"fy2026":true,"fy2027":true,"billableFy2026":true,"billableFy2027":true},"sibling_codes":["K66","K66.0","K66.1","K66.8"],"inclusionTerms":[],"sibling_titles":{"code":"K66.8","title":"Other specified disorders of peritoneum","isBillable":true},"useAdditionalCode":[],"clinicalDefinition":"Disorder of peritoneum, unspecified is a billable ICD-10-CM diagnosis code (K66.9). Excludes2 (not included here): ascites (R18.-); peritoneal effusion (chronic) (R18.8).","officialDefinition":"Disorder of peritoneum, unspecified is a billable ICD-10-CM diagnosis code (K66.9). Excludes2 (not included here): ascites (R18.-); peritoneal effusion (chronic) (R18.8).","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":"","hcc":{"mapped":false,"model":"CMS-HCC V28","paymentYear":"2026","categories":[],"otherModels":[]}}