{"code":"M26.64","type":"code","title":"Arthritis of temporomandibular joint","codeAlso":[],"includes":[],"modern_v":"official26","codeFirst":[],"excludes1":["hemifacial atrophy or hypertrophy (Q67.4)","unilateral condylar hyperplasia or hypoplasia (M27.8)"],"excludes2":["current temporomandibular joint dislocation (S03.0)","current temporomandibular joint sprain (S03.4)"],"isBillable":false,"fyEffectivity":{"fy2026":true,"fy2027":true,"billableFy2026":false,"billableFy2027":false},"sibling_codes":["M26.641","M26.642","M26.643","M26.649"],"inclusionTerms":[],"sibling_titles":{"code":"M26.649","title":"Arthritis of unspecified temporomandibular joint","isBillable":true},"useAdditionalCode":[],"clinicalDefinition":"Arthritis of temporomandibular joint is a non-billable ICD-10-CM category code (M26.64). A more specific billable subcode must be selected for claims submission. Excludes1 (not coded here): hemifacial atrophy or hypertrophy (Q67.4); unilateral condylar hyperplasia or hypoplasia (M27.8). Excludes2 (not included here): current temporomandibular joint dislocation (S03.0); current temporomandibular joint sprain (S03.4).","officialDefinition":"Arthritis of temporomandibular joint is a non-billable ICD-10-CM category code (M26.64). A more specific billable subcode must be selected for claims submission. Excludes1 (not coded here): hemifacial atrophy or hypertrophy (Q67.4); unilateral condylar hyperplasia or hypoplasia (M27.8). Excludes2 (not included here): current temporomandibular joint dislocation (S03.0); current temporomandibular joint sprain (S03.4).","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":""}