{"code":"M66.1","type":"code","title":"Rupture of synovium","codeAlso":[],"includes":["rupture that occurs when a normal force is applied to tissues that are inferred to have less than normal strength"],"modern_v":"official26","codeFirst":[],"excludes1":[],"excludes2":["rupture of popliteal cyst (M66.0)","rotator cuff syndrome (M75.1-)","rupture where an abnormal force is applied to normal tissue - see injury of tendon by body region"],"isBillable":false,"fyEffectivity":{"fy2026":true,"fy2027":true},"sibling_codes":["M66.10","M66.11","M66.111","M66.112","M66.119","M66.12","M66.121","M66.122","M66.129","M66.13","M66.131","M66.132","M66.139","M66.14","M66.141","M66.142","M66.143","M66.144","M66.145","M66.146","M66.15","M66.151","M66.152","M66.159","M66.17","M66.171","M66.172","M66.173","M66.174","M66.175","M66.176","M66.177","M66.178","M66.179","M66.18"],"inclusionTerms":["Rupture of synovial cyst"],"sibling_titles":{"code":"M66.18","title":"Rupture of synovium, other site","isBillable":true},"useAdditionalCode":[],"clinicalDefinition":"Rupture of synovium is a non-billable ICD-10-CM category code (M66.1). A more specific billable subcode must be selected for claims submission. Includes: rupture that occurs when a normal force is applied to tissues that are inferred to have less than normal strength. Inclusion terms: Rupture of synovial cyst. Excludes2 (not included here): rupture of popliteal cyst (M66.0); rotator cuff syndrome (M75.1-); rupture where an abnormal force is applied to normal tissue - see injury of tendon by body region.","officialDefinition":"Rupture of synovium is a non-billable ICD-10-CM category code (M66.1). A more specific billable subcode must be selected for claims submission. Includes: rupture that occurs when a normal force is applied to tissues that are inferred to have less than normal strength. Inclusion terms: Rupture of synovial cyst. Excludes2 (not included here): rupture of popliteal cyst (M66.0); rotator cuff syndrome (M75.1-); rupture where an abnormal force is applied to normal tissue - see injury of tendon by body region.","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":""}