{"code":"T42.3","type":"code","title":"Poisoning by, adverse effect of and underdosing of barbiturates","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":["poisoning by, adverse effect of and underdosing of thiobarbiturates (T41.1-)","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":false,"fyEffectivity":{"fy2026":true,"fy2027":true,"billableFy2026":false,"billableFy2027":false},"sibling_codes":["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","T42.3X6","T42.3X6A","T42.3X6D","T42.3X6S"],"inclusionTerms":[],"sibling_titles":{"code":"T42.3X6S","title":"Underdosing 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, adverse effect of and underdosing of barbiturates is a non-billable ICD-10-CM category code (T42.3). A more specific billable subcode must be selected for claims submission. 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.","officialDefinition":"Poisoning by, adverse effect of and underdosing of barbiturates is a non-billable ICD-10-CM category code (T42.3). A more specific billable subcode must be selected for claims submission. 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. Excludes1 (not coded here): poisoning by, adverse effect of and underdosing of thiobarbiturates (T41.1-); 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":""}