2025 Drugs Underdosing ICD-10-CM Codes

When coding drug underdosing due to the improper use of a medication or substance first assign the appropriate code from the 516 total codes in the ICD-10-CM Table of Drugs and Chemicals. No additional external cause code is required for poisonings, toxic effects, adverse effects and underdosing codes.

ICD CodeDescriptionCategoryApplicable To
T50.A26DUnderdosing of mixed bacterial vaccines without a pertussis component, subsequent encounterPoisoning by, adverse effect of and underdosing of diuretics and other and unspecified drugs, medicaments and biological substances (T50)
T50.A96Underdosing of other bacterial vaccinesPoisoning by, adverse effect of and underdosing of diuretics and other and unspecified drugs, medicaments and biological substances (T50)BCG (vaccine); Cholera vaccine; Meningococcal vaccine; Menningovax (-AC) (-C); Paratyphoid vaccine; Plague vaccine; Rickettsial vaccine NEC; Rocky Mountain spotted fever vaccine; Tetanus toxoid or vaccine; Tetanus toxoid or vaccineantitoxin; Tetanus toxoid or vaccineimmune globulin (human); Tetanus toxoid or vaccinetoxoid; Tetanus toxoid or vaccinetoxoidwith diphtheria toxoid; Tetanus toxoid or va...
T50.A96AUnderdosing of other bacterial vaccines, initial encounterPoisoning by, adverse effect of and underdosing of diuretics and other and unspecified drugs, medicaments and biological substances (T50)
T50.A96DUnderdosing of other bacterial vaccines, subsequent encounterPoisoning by, adverse effect of and underdosing of diuretics and other and unspecified drugs, medicaments and biological substances (T50)
T50.B16Underdosing of smallpox vaccinesPoisoning by, adverse effect of and underdosing of diuretics and other and unspecified drugs, medicaments and biological substances (T50)Smallpox vaccine
T50.B16AUnderdosing of smallpox vaccines, initial encounterPoisoning by, adverse effect of and underdosing of diuretics and other and unspecified drugs, medicaments and biological substances (T50)
T50.B16DUnderdosing of smallpox vaccines, subsequent encounterPoisoning by, adverse effect of and underdosing of diuretics and other and unspecified drugs, medicaments and biological substances (T50)
T50.B96Underdosing of other viral vaccinesPoisoning by, adverse effect of and underdosing of diuretics and other and unspecified drugs, medicaments and biological substances (T50)Diplovax; Influenza vaccine; Measles virus vaccine (attenuated); Meruvax; Mumpsvax; Orimune; Poliomyelitis vaccine; Rubella vaccine; Rubeola vaccine; Synagis; Viral vaccine NEC; Yellow; Yellowfever vaccine; Yellowjasmine; Yellowphenolphthalein
T50.B96AUnderdosing of other viral vaccines, initial encounterPoisoning by, adverse effect of and underdosing of diuretics and other and unspecified drugs, medicaments and biological substances (T50)
T50.B96DUnderdosing of other viral vaccines, subsequent encounterPoisoning by, adverse effect of and underdosing of diuretics and other and unspecified drugs, medicaments and biological substances (T50)
T50.Z16Underdosing of immunoglobulinPoisoning by, adverse effect of and underdosing of diuretics and other and unspecified drugs, medicaments and biological substances (T50)AHLG; Anti-D immunoglobulin (human); Antidiphtheria serum; Anti-human lymphocytic globulin; Antirabies hyperimmune serum; Antiscorpion sera; Antitetanus immunoglobulin; Antitoxin; Antitoxindiphtheria; Antitoxingas gangrene; Antitoxintetanus; Antivenin, antivenom (sera); Antivenin, antivenom (sera)crotaline; Antivenin, antivenom (sera)spider bite; Botulinus anti-toxin (type A, B); Diphtheria; Dipht...
T50.Z16AUnderdosing of immunoglobulin, initial encounterPoisoning by, adverse effect of and underdosing of diuretics and other and unspecified drugs, medicaments and biological substances (T50)
T50.Z16DUnderdosing of immunoglobulin, subsequent encounterPoisoning by, adverse effect of and underdosing of diuretics and other and unspecified drugs, medicaments and biological substances (T50)
T50.Z96Underdosing of other vaccines and biological substancesPoisoning by, adverse effect of and underdosing of diuretics and other and unspecified drugs, medicaments and biological substances (T50)Glandular extract (medicinal) NEC; Pegademase, bovine; Vaccine NEC; Vaccine NECantineoplastic; Vaccine NECbacterial NEC; Vaccine NECbacterial NECwith; Vaccine NECbacterial NECwithother bacterial component; Vaccine NECbacterial NECwithpertussis component; Vaccine NECbacterial NECwithviral-rickettsial component; Vaccine NECbacterial NECmixed NEC; Vaccine NECBCG; Vaccine NECcholera; Vaccine NECdiphth...
T50.Z96AUnderdosing of other vaccines and biological substances, initial encounterPoisoning by, adverse effect of and underdosing of diuretics and other and unspecified drugs, medicaments and biological substances (T50)
T50.Z96DUnderdosing of other vaccines and biological substances, subsequent encounterPoisoning by, adverse effect of and underdosing of diuretics and other and unspecified drugs, medicaments and biological substances (T50)