{"code":"E20.818","type":"code","title":"Other specified hypoparathyroidism due to impaired parathyroid hormone secretion","codeAlso":[],"includes":[],"modern_v":"official26","codeFirst":[],"excludes1":["Di George's syndrome (D82.1)","postprocedural hypoparathyroidism (E89.2)","tetany NOS (R29.0)","transitory neonatal hypoparathyroidism (P71.4)","galactorrhea (N64.3)","gynecomastia (N62)"],"excludes2":[],"isBillable":true,"fyEffectivity":{"fy2026":true,"fy2027":true,"billableFy2026":true,"billableFy2027":true},"sibling_codes":["E20","E20.0","E20.1","E20.8","E20.810","E20.811","E20.812","E20.819","E20.9"],"inclusionTerms":["Familial isolated hypoparathyroidism"],"sibling_titles":{"code":"E20.9","title":"Hypoparathyroidism, unspecified","isBillable":true},"useAdditionalCode":[],"clinicalDefinition":"Other specified hypoparathyroidism due to impaired parathyroid hormone secretion is a billable ICD-10-CM diagnosis code (E20.818). Inclusion terms: Familial isolated hypoparathyroidism. Excludes1 (not coded here): Di George's syndrome (D82.1); postprocedural hypoparathyroidism (E89.2); tetany NOS (R29.0); transitory neonatal hypoparathyroidism (P71.4); galactorrhea (N64.3); gynecomastia (N62).","officialDefinition":"Other specified hypoparathyroidism due to impaired parathyroid hormone secretion is a billable ICD-10-CM diagnosis code (E20.818). Inclusion terms: Familial isolated hypoparathyroidism. Excludes1 (not coded here): Di George's syndrome (D82.1); postprocedural hypoparathyroidism (E89.2); tetany NOS (R29.0); transitory neonatal hypoparathyroidism (P71.4); galactorrhea (N64.3); gynecomastia (N62).","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":{"Di George's syndrome (D82.1)":"E20","postprocedural hypoparathyroidism (E89.2)":"E20","tetany NOS (R29.0)":"E20","transitory neonatal hypoparathyroidism (P71.4)":"E20","galactorrhea (N64.3)":"E20","gynecomastia (N62)":"E20"},"hcc":{"mapped":false,"model":"CMS-HCC V28","paymentYear":"2026","categories":[],"otherModels":[{"model":"CMS-HCC V22","hcc":"23"},{"model":"RxHCC V08","hcc":"43"}]}}