{"code":"S64.00XA","type":"code","title":"Injury of ulnar nerve at wrist and hand level of unspecified arm, initial encounter","isBillable":true,"modern_v":"official26","source":"CMS FY2026 icd10cm_order_2026.txt (restored 2026-08-08 after import gap)","sibling_codes":["S64","S64.0","S64.00A","S64.00D","S64.00S","S64.00XD","S64.00XS","S64.01A","S64.01D","S64.01S","S64.01XA","S64.01XD","S64.01XS","S64.02A","S64.02D","S64.02S","S64.02XA","S64.02XD","S64.02XS","S64.1","S64.10A","S64.10D","S64.10S","S64.10XA","S64.10XD","S64.10XS","S64.11A","S64.11D","S64.11S","S64.11XA","S64.11XD","S64.11XS","S64.12A","S64.12D","S64.12S","S64.12XA","S64.12XD","S64.12XS","S64.2","S64.20A","S64.20D","S64.20S","S64.20XA","S64.20XD","S64.20XS","S64.21A","S64.21D","S64.21S","S64.21XA","S64.21XD","S64.21XS","S64.22A","S64.22D","S64.22S","S64.22XA","S64.22XD","S64.22XS","S64.3","S64.30A","S64.30D","S64.30S","S64.30XA","S64.30XD","S64.30XS","S64.31A","S64.31D","S64.31S","S64.31XA","S64.31XD","S64.31XS","S64.32A","S64.32D","S64.32S","S64.32XA","S64.32XD","S64.32XS","S64.4","S64.40A","S64.40D","S64.40S","S64.40XA","S64.40XD","S64.40XS","S64.490","S64.490A","S64.490D"],"sibling_titles":{"code":"S64.490D","title":"Injury of digital nerve of right index finger, subsequent encounter","isBillable":true},"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":"","officialDefinition":"Injury of ulnar nerve at wrist and hand level of unspecified arm, initial encounter (S64.00XA) is a billable ICD-10-CM diagnosis code, valid for claim submission. It is classified under category S64 (Injury of nerves at wrist and hand level), within the Injuries to the wrist, hand and fingers (S60-S69) block, within Chapter 19, Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88). The official tabular list attaches no additional inclusion or exclusion notes to this code. Code selection within this family is differentiated by its related codes: S64.0 (Injury of ulnar nerve at wrist and hand level); S64.00A (Injury of ulnar nerve at wrist and hand level of unspecified arm, initial encounter); S64.00D (Injury of ulnar nerve at wrist and hand level of unspecified arm, subsequent encounter); S64.00S (Injury of ulnar nerve at wrist and hand level of unspecified arm, sequela).","clinicalDefinition":"Injury of ulnar nerve at wrist and hand level of unspecified arm, initial encounter (S64.00XA) is a billable ICD-10-CM diagnosis code, valid for claim submission. It is classified under category S64 (Injury of nerves at wrist and hand level), within the Injuries to the wrist, hand and fingers (S60-S69) block, within Chapter 19, Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88). The official tabular list attaches no additional inclusion or exclusion notes to this code. Code selection within this family is differentiated by its related codes: S64.0 (Injury of ulnar nerve at wrist and hand level); S64.00A (Injury of ulnar nerve at wrist and hand level of unspecified arm, initial encounter); S64.00D (Injury of ulnar nerve at wrist and hand level of unspecified arm, subsequent encounter); S64.00S (Injury of ulnar nerve at wrist and hand level of unspecified arm, sequela)."}