{"code":"T42.0X1A","type":"code","title":"Poisoning by hydantoin derivatives, accidental (unintentional), initial encounter","codeAlso":[],"includes":["adverse effect of correct substance properly administered","poisoning by overdose of substance","poisoning by wrong substance given or taken in error","underdosing by (inadvertently) (deliberately) taking less substance than prescribed or instructed"],"modern_v":"official26","codeFirst":[", for adverse effects, the nature of the adverse effect, such as:","adverse effect NOS (T88.7)","aspirin gastritis (K29.-)","blood disorders (D56-D76)","contact dermatitis (L23-L25)","dermatitis due to substances taken internally (L27.-)","nephropathy (N14.0-N14.2)"],"excludes1":["toxic reaction to local anesthesia in pregnancy (O29.3-)"],"excludes2":["drug dependence and related mental and behavioral disorders due to psychoactive substance use (F10.--F19.-)","abuse and dependence of psychoactive substances (F10-F19)","abuse of non-dependence-producing substances (F55.-)","immunodeficiency due to drugs (D84.821)","drug reaction and poisoning affecting newborn (P00-P96)","pathological drug intoxication (inebriation) (F10-F19)"],"isBillable":true,"fyEffectivity":{"fy2026":true,"fy2027":true,"billableFy2026":true,"billableFy2027":true},"sibling_codes":["T42","T42.0","T42.0X","T42.0X1","T42.0X1D","T42.0X1S","T42.0X2","T42.0X2A","T42.0X2D","T42.0X2S","T42.0X3","T42.0X3A","T42.0X3D","T42.0X3S","T42.0X4","T42.0X4A","T42.0X4D","T42.0X4S","T42.0X5","T42.0X5A","T42.0X5D","T42.0X5S","T42.0X6","T42.0X6A","T42.0X6D","T42.0X6S","T42.1","T42.1X","T42.1X1","T42.1X1A","T42.1X1D","T42.1X1S","T42.1X2","T42.1X2A","T42.1X2D","T42.1X2S","T42.1X3","T42.1X3A","T42.1X3D","T42.1X3S","T42.1X4","T42.1X4A","T42.1X4D","T42.1X4S","T42.1X5","T42.1X5A","T42.1X5D","T42.1X5S","T42.1X6","T42.1X6A","T42.1X6D","T42.1X6S","T42.2","T42.2X","T42.2X1","T42.2X1A","T42.2X1D","T42.2X1S","T42.2X2","T42.2X2A","T42.2X2D","T42.2X2S","T42.2X3","T42.2X3A","T42.2X3D","T42.2X3S","T42.2X4","T42.2X4A","T42.2X4D","T42.2X4S","T42.2X5","T42.2X5A","T42.2X5D","T42.2X5S","T42.2X6","T42.2X6A","T42.2X6D","T42.2X6S","T42.3","T42.3X","T42.3X1","T42.3X1A","T42.3X1D","T42.3X1S","T42.3X2","T42.3X2A","T42.3X2D","T42.3X2S","T42.3X3","T42.3X3A","T42.3X3D","T42.3X3S","T42.3X4","T42.3X4A","T42.3X4D","T42.3X4S","T42.3X5","T42.3X5A","T42.3X5D","T42.3X5S"],"inclusionTerms":["Poisoning by hydantoin derivatives NOS"],"sibling_titles":{"code":"T42.3X5S","title":"Adverse effect of barbiturates, sequela","isBillable":true},"useAdditionalCode":["code(s) to specify:","manifestations of poisoning","underdosing or failure in dosage during medical and surgical care (Y63.6, Y63.8-Y63.9)","underdosing of medication regimen (Z91.12-, Z91.13-)"],"clinicalDefinition":"Poisoning by hydantoin derivatives, accidental (unintentional), initial encounter is a billable ICD-10-CM diagnosis code (T42.0X1A). Includes: adverse effect of correct substance properly administered; poisoning by overdose of substance; poisoning by wrong substance given or taken in error; underdosing by (inadvertently) (deliberately) taking less substance than prescribed or instructed. Inclusion terms: Poisoning by hydantoin derivatives NOS.","officialDefinition":"Poisoning by hydantoin derivatives, accidental (unintentional), initial encounter is a billable ICD-10-CM diagnosis code (T42.0X1A). Includes: adverse effect of correct substance properly administered; poisoning by overdose of substance; poisoning by wrong substance given or taken in error; underdosing by (inadvertently) (deliberately) taking less substance than prescribed or instructed. Inclusion terms: Poisoning by hydantoin derivatives NOS. Excludes1 (not coded here): toxic reaction to local anesthesia in pregnancy (O29.3-). Excludes2 (not included here): drug dependence and related mental and behavioral disorders due to psychoactive substance use (F10.--F19.-); abuse and dependence of psychoactive substances (F10-F19); abuse of non-dependence-producing substances (F55.-); immunodeficiency due to drugs (D84.821); drug reaction and poisoning affecting newborn (P00-P96); pathological drug intoxication (inebriation) (F10-F19). Code first: , for adverse effects, the nature of the adverse effect, such as:; adverse effect NOS (T88.7); aspirin gastritis (K29.-); blood disorders (D56-D76); contact dermatitis (L23-L25); dermatitis due to substances taken internally (L27.-); nephropathy (N14.0-N14.2). Use additional code: code(s) to specify:; manifestations of poisoning; underdosing or failure in dosage during medical and surgical care (Y63.6, Y63.8-Y63.9); underdosing of medication regimen (Z91.12-, Z91.13-). 7th character: The appropriate 7th character is to be added to each code from category T42.","seventhCharacterInstructions":["The appropriate 7th character is to be added to each code from category T42"],"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":"","noteProvenance":{"toxic reaction to local anesthesia in pregnancy (O29.3-)":"T42","drug dependence and related mental and behavioral disorders due to psychoactive substance use (F10.--F19.-)":"T42","abuse and dependence of psychoactive substances (F10-F19)":"T42","abuse of non-dependence-producing substances (F55.-)":"T42","immunodeficiency due to drugs (D84.821)":"T42","drug reaction and poisoning affecting newborn (P00-P96)":"T42","pathological drug intoxication (inebriation) (F10-F19)":"T42",", for adverse effects, the nature of the adverse effect, such as:":"T42","adverse effect NOS (T88.7)":"T42","aspirin gastritis (K29.-)":"T42","blood disorders (D56-D76)":"T42","contact dermatitis (L23-L25)":"T42","dermatitis due to substances taken internally (L27.-)":"T42","nephropathy (N14.0-N14.2)":"T42","code(s) to specify:":"T42","manifestations of poisoning":"T42","underdosing or failure in dosage during medical and surgical care (Y63.6, Y63.8-Y63.9)":"T42","underdosing of medication regimen (Z91.12-, Z91.13-)":"T42","adverse effect of correct substance properly administered":"T42","poisoning by overdose of substance":"T42","poisoning by wrong substance given or taken in error":"T42","underdosing by (inadvertently) (deliberately) taking less substance than prescribed or instructed":"T42","Poisoning by hydantoin derivatives NOS":"T42.0X1"},"hcc":{"mapped":false,"model":"CMS-HCC V28","paymentYear":"2026","categories":[],"otherModels":[]}}