{"code":"E21.1","type":"code","title":"Secondary hyperparathyroidism, not elsewhere classified","codeAlso":[],"includes":[],"modern_v":"official26","codeFirst":[],"excludes1":["secondary hyperparathyroidism of renal origin (N25.81)","adult osteomalacia (M83.-)","ectopic hyperparathyroidism (E34.2)","hungry bone syndrome (E83.81)","infantile and juvenile osteomalacia (E55.0)","galactorrhea (N64.3)","gynecomastia (N62)"],"excludes2":["familial hypocalciuric hypercalcemia (E83.52)"],"isBillable":true,"fyEffectivity":{"fy2026":true,"fy2027":true,"billableFy2026":true,"billableFy2027":true},"sibling_codes":["E21","E21.0","E21.2","E21.3","E21.4","E21.5"],"inclusionTerms":[],"sibling_titles":{"code":"E21.5","title":"Disorder of parathyroid gland, unspecified","isBillable":true},"useAdditionalCode":[],"clinicalDefinition":"Secondary hyperparathyroidism, not elsewhere classified is a billable ICD-10-CM diagnosis code (E21.1). Excludes1 (not coded here): secondary hyperparathyroidism of renal origin (N25.81); adult osteomalacia (M83.-); ectopic hyperparathyroidism (E34.2); hungry bone syndrome (E83.81); infantile and juvenile osteomalacia (E55.0); galactorrhea (N64.3); gynecomastia (N62). Excludes2 (not included here): familial hypocalciuric hypercalcemia (E83.52).","officialDefinition":"Secondary hyperparathyroidism, not elsewhere classified is a billable ICD-10-CM diagnosis code (E21.1). Excludes1 (not coded here): secondary hyperparathyroidism of renal origin (N25.81); adult osteomalacia (M83.-); ectopic hyperparathyroidism (E34.2); hungry bone syndrome (E83.81); infantile and juvenile osteomalacia (E55.0); galactorrhea (N64.3); gynecomastia (N62). Excludes2 (not included here): familial hypocalciuric hypercalcemia (E83.52).","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":""}