{"code":"M18","type":"category","title":"Osteoarthritis of first carpometacarpal joint","codeAlso":[],"includes":[],"modern_v":"official26","codeFirst":[],"excludes1":[],"excludes2":["osteoarthritis of spine (M47.-)"],"isBillable":false,"fyEffectivity":{"fy2026":true,"fy2027":true,"billableFy2026":false,"billableFy2027":false},"sibling_codes":["M18.0","M18.1","M18.10","M18.11","M18.12","M18.2","M18.3","M18.30","M18.31","M18.32","M18.4","M18.5","M18.50","M18.51","M18.52","M18.9"],"inclusionTerms":[],"sibling_titles":{"code":"M18.9","title":"Osteoarthritis of first carpometacarpal joint, unspecified","isBillable":true},"useAdditionalCode":[],"clinicalDefinition":"Osteoarthritis of first carpometacarpal joint is a non-billable ICD-10-CM category code (M18). A more specific billable subcode must be selected for claims submission. Excludes2 (not included here): osteoarthritis of spine (M47.-).","officialDefinition":"Osteoarthritis of first carpometacarpal joint is a non-billable ICD-10-CM category code (M18). A more specific billable subcode must be selected for claims submission. Excludes2 (not included here): osteoarthritis of spine (M47.-).","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":[{"code":"M18.0","title":"Bilateral primary osteoarthritis of first carpometacarpal joints","description":"Bilateral primary osteoarthritis of first carpometacarpal joints is a billable ICD-10-CM diagnosis code (M18.0). Excludes2 (not included here): osteoarthritis of spine (M47.-).","isBillable":true,"slug":"m18.0-bilateral-primary-osteoarthritis-of-first-carpometacarpal-joints"},{"code":"M18.1","title":"Unilateral primary osteoarthritis of first carpometacarpal joint","description":"Unilateral primary osteoarthritis of first carpometacarpal joint is a non-billable ICD-10-CM category code (M18.1). A more specific billable subcode must be selected for claims submission. Inclusion terms: Primary osteoarthritis of first carpometacarpal joint NOS. Excludes2 (not included here): osteoarthritis of spine (M47.-).","isBillable":false,"slug":"m18.1-unilateral-primary-osteoarthritis-of-first-carpometacarpal-joint"},{"code":"M18.10","title":"Unilateral primary osteoarthritis of first carpometacarpal joint, unspecified hand","description":"Unilateral primary osteoarthritis of first carpometacarpal joint, unspecified hand is a billable ICD-10-CM diagnosis code (M18.10). Excludes2 (not included here): osteoarthritis of spine (M47.-).","isBillable":true,"slug":"m18.10-unilateral-primary-osteoarthritis-of-first-carpometacarpal-joint-unspecified-hand"},{"code":"M18.11","title":"Unilateral primary osteoarthritis of first carpometacarpal joint, right hand","description":"Unilateral primary osteoarthritis of first carpometacarpal joint, right hand is a billable ICD-10-CM diagnosis code (M18.11). Excludes2 (not included here): osteoarthritis of spine (M47.-).","isBillable":true,"slug":"m18.11-unilateral-primary-osteoarthritis-of-first-carpometacarpal-joint-right-hand"},{"code":"M18.12","title":"Unilateral primary osteoarthritis of first carpometacarpal joint, left hand","description":"Unilateral primary osteoarthritis of first carpometacarpal joint, left hand is a billable ICD-10-CM diagnosis code (M18.12). Excludes2 (not included here): osteoarthritis of spine (M47.-).","isBillable":true,"slug":"m18.12-unilateral-primary-osteoarthritis-of-first-carpometacarpal-joint-left-hand"},{"code":"M18.2","title":"Bilateral post-traumatic osteoarthritis of first carpometacarpal joints","description":"Bilateral post-traumatic osteoarthritis of first carpometacarpal joints is a billable ICD-10-CM diagnosis code (M18.2). Excludes2 (not included here): osteoarthritis of spine (M47.-).","isBillable":true,"slug":"m18.2-bilateral-post-traumatic-osteoarthritis-of-first-carpometacarpal-joints"},{"code":"M18.3","title":"Unilateral post-traumatic osteoarthritis of first carpometacarpal joint","description":"Unilateral post-traumatic osteoarthritis of first carpometacarpal joint is a non-billable ICD-10-CM category code (M18.3). A more specific billable subcode must be selected for claims submission. Inclusion terms: Post-traumatic osteoarthritis of first carpometacarpal joint NOS. Excludes2 (not included here): osteoarthritis of spine (M47.-).","isBillable":false,"slug":"m18.3-unilateral-post-traumatic-osteoarthritis-of-first-carpometacarpal-joint"},{"code":"M18.30","title":"Unilateral post-traumatic osteoarthritis of first carpometacarpal joint, unspecified hand","description":"Unilateral post-traumatic osteoarthritis of first carpometacarpal joint, unspecified hand is a billable ICD-10-CM diagnosis code (M18.30). Excludes2 (not included here): osteoarthritis of spine (M47.-).","isBillable":true,"slug":"m18.30-unilateral-post-traumatic-osteoarthritis-of-first-carpometacarpal-joint-unspecified-hand"},{"code":"M18.31","title":"Unilateral post-traumatic osteoarthritis of first carpometacarpal joint, right hand","description":"Unilateral post-traumatic osteoarthritis of first carpometacarpal joint, right hand is a billable ICD-10-CM diagnosis code (M18.31). Excludes2 (not included here): osteoarthritis of spine (M47.-).","isBillable":true,"slug":"m18.31-unilateral-post-traumatic-osteoarthritis-of-first-carpometacarpal-joint-right-hand"},{"code":"M18.32","title":"Unilateral post-traumatic osteoarthritis of first carpometacarpal joint, left hand","description":"Unilateral post-traumatic osteoarthritis of first carpometacarpal joint, left hand is a billable ICD-10-CM diagnosis code (M18.32). Excludes2 (not included here): osteoarthritis of spine (M47.-).","isBillable":true,"slug":"m18.32-unilateral-post-traumatic-osteoarthritis-of-first-carpometacarpal-joint-left-hand"},{"code":"M18.4","title":"Other bilateral secondary osteoarthritis of first carpometacarpal joints","description":"Other bilateral secondary osteoarthritis of first carpometacarpal joints is a billable ICD-10-CM diagnosis code (M18.4). Excludes2 (not included here): osteoarthritis of spine (M47.-).","isBillable":true,"slug":"m18.4-other-bilateral-secondary-osteoarthritis-of-first-carpometacarpal-joints"},{"code":"M18.5","title":"Other unilateral secondary osteoarthritis of first carpometacarpal joint","description":"Other unilateral secondary osteoarthritis of first carpometacarpal joint is a non-billable ICD-10-CM category code (M18.5). A more specific billable subcode must be selected for claims submission. Inclusion terms: Secondary osteoarthritis of first carpometacarpal joint NOS. Excludes2 (not included here): osteoarthritis of spine (M47.-).","isBillable":false,"slug":"m18.5-other-unilateral-secondary-osteoarthritis-of-first-carpometacarpal-joint"},{"code":"M18.50","title":"Other unilateral secondary osteoarthritis of first carpometacarpal joint, unspecified hand","description":"Other unilateral secondary osteoarthritis of first carpometacarpal joint, unspecified hand is a billable ICD-10-CM diagnosis code (M18.50). Excludes2 (not included here): osteoarthritis of spine (M47.-).","isBillable":true,"slug":"m18.50-other-unilateral-secondary-osteoarthritis-of-first-carpometacarpal-joint-unspecified-hand"},{"code":"M18.51","title":"Other unilateral secondary osteoarthritis of first carpometacarpal joint, right hand","description":"Other unilateral secondary osteoarthritis of first carpometacarpal joint, right hand is a billable ICD-10-CM diagnosis code (M18.51). Excludes2 (not included here): osteoarthritis of spine (M47.-).","isBillable":true,"slug":"m18.51-other-unilateral-secondary-osteoarthritis-of-first-carpometacarpal-joint-right-hand"},{"code":"M18.52","title":"Other unilateral secondary osteoarthritis of first carpometacarpal joint, left hand","description":"Other unilateral secondary osteoarthritis of first carpometacarpal joint, left hand is a billable ICD-10-CM diagnosis code (M18.52). Excludes2 (not included here): osteoarthritis of spine (M47.-).","isBillable":true,"slug":"m18.52-other-unilateral-secondary-osteoarthritis-of-first-carpometacarpal-joint-left-hand"},{"code":"M18.9","title":"Osteoarthritis of first carpometacarpal joint, unspecified","description":"Osteoarthritis of first carpometacarpal joint, unspecified is a billable ICD-10-CM diagnosis code (M18.9). Excludes2 (not included here): osteoarthritis of spine (M47.-).","isBillable":true,"slug":"m18.9-osteoarthritis-of-first-carpometacarpal-joint-unspecified"}],"hierarchy":[],"relatedCodes":[],"relevantCPTCodes":[],"documentationTips":[],"caseStudies":[],"description":"","overview":""}