2026 Drugs Underdosing ICD-10-CM Codes - Page 5
The 2026 Underdosing ICD-10-CM Codes list includes 2,116 codes for situations where a patient takes less of a prescribed drug or substance than ordered, potentially resulting in suboptimal treatment or complications. Underdosing may occur due to financial limitations, misunderstanding of instructions, or intentional avoidance of medication. Coders must ensure documentation clearly identifies underdosing and select the appropriate code from the ICD-10-CM List of Drugs and Chemicals. No external cause code is required. Accurate coding supports proper claims adjudication and clinical tracking.
T78.8XXS - Other adverse effects, not elsewhere classified, sequela Billable
T64.01XS - Toxic effect of aflatoxin, accidental (unintentional), sequela Billable
T64.02XS - Toxic effect of aflatoxin, intentional self-harm, sequela Billable
T64.03XS - Toxic effect of aflatoxin, assault, sequela Billable
T64.04XS - Toxic effect of aflatoxin, undetermined, sequela Billable
T64.81XS - Toxic effect of other mycotoxin food contaminants, accidental (unintentional), sequela Billable
T64.82XS - Toxic effect of other mycotoxin food contaminants, intentional self-harm, sequela Billable
T64.83XS - Toxic effect of other mycotoxin food contaminants, assault, sequela Billable
T64.84XS - Toxic effect of other mycotoxin food contaminants, undetermined, sequela Billable
T63.512S - Toxic effect of contact with stingray, intentional self-harm, sequela Billable
T63.513S - Toxic effect of contact with stingray, assault, sequela Billable
T63.514S - Toxic effect of contact with stingray, undetermined, sequela Billable
T63.591S - Toxic effect of contact with other venomous fish, accidental (unintentional), sequela Billable
T63.592S - Toxic effect of contact with other venomous fish, intentional self-harm, sequela Billable
T63.593S - Toxic effect of contact with other venomous fish, assault, sequela Billable
T63.594S - Toxic effect of contact with other venomous fish, undetermined, sequela Billable
T63.611S - Toxic effect of contact with Portuguese Man-o-war, accidental (unintentional), sequela Billable
T63.612S - Toxic effect of contact with Portuguese Man-o-war, intentional self-harm, sequela Billable
T63.613S - Toxic effect of contact with Portuguese Man-o-war, assault, sequela Billable
T63.614S - Toxic effect of contact with Portuguese Man-o-war, undetermined, sequela Billable
T63.621S - Toxic effect of contact with other jellyfish, accidental (unintentional), sequela Billable
T63.622S - Toxic effect of contact with other jellyfish, intentional self-harm, sequela Billable
T63.623S - Toxic effect of contact with other jellyfish, assault, sequela Billable
T63.624S - Toxic effect of contact with other jellyfish, undetermined, sequela Billable
T63.631S - Toxic effect of contact with sea anemone, accidental (unintentional), sequela Billable
T63.632S - Toxic effect of contact with sea anemone, intentional self-harm, sequela Billable
T63.633S - Toxic effect of contact with sea anemone, assault, sequela Billable
T63.634S - Toxic effect of contact with sea anemone, undetermined, sequela Billable
T63.691S - Toxic effect of contact with other venomous marine animals, accidental (unintentional), sequela Billable
T63.692S - Toxic effect of contact with other venomous marine animals, intentional self-harm, sequela Billable
T63.693S - Toxic effect of contact with other venomous marine animals, assault, sequela Billable
T63.694S - Toxic effect of contact with other venomous marine animals, undetermined, sequela Billable
T63.711S - Toxic effect of contact with venomous marine plant, accidental (unintentional), sequela Billable
T63.712S - Toxic effect of contact with venomous marine plant, intentional self-harm, sequela Billable
T63.713S - Toxic effect of contact with venomous marine plant, assault, sequela Billable
T63.714S - Toxic effect of contact with venomous marine plant, undetermined, sequela Billable
T63.791S - Toxic effect of contact with other venomous plant, accidental (unintentional), sequela Billable
T63.792S - Toxic effect of contact with other venomous plant, intentional self-harm, sequela Billable
T63.793S - Toxic effect of contact with other venomous plant, assault, sequela Billable
T63.794S - Toxic effect of contact with other venomous plant, undetermined, sequela Billable
T63.811S - Toxic effect of contact with venomous frog, accidental (unintentional), sequela Billable
T63.812S - Toxic effect of contact with venomous frog, intentional self-harm, sequela Billable
T63.813S - Toxic effect of contact with venomous frog, assault, sequela Billable
T63.814S - Toxic effect of contact with venomous frog, undetermined, sequela Billable
T63.821S - Toxic effect of contact with venomous toad, accidental (unintentional), sequela Billable
T63.822S - Toxic effect of contact with venomous toad, intentional self-harm, sequela Billable
T63.823S - Toxic effect of contact with venomous toad, assault, sequela Billable
T63.824S - Toxic effect of contact with venomous toad, undetermined, sequela Billable
T63.831S - Toxic effect of contact with other venomous amphibian, accidental (unintentional), sequela Billable
T63.832S - Toxic effect of contact with other venomous amphibian, intentional self-harm, sequela Billable
T63.833S - Toxic effect of contact with other venomous amphibian, assault, sequela Billable
T63.834S - Toxic effect of contact with other venomous amphibian, undetermined, sequela Billable
T63.891S - Toxic effect of contact with other venomous animals, accidental (unintentional), sequela Billable
T63.892S - Toxic effect of contact with other venomous animals, intentional self-harm, sequela Billable
T63.893S - Toxic effect of contact with other venomous animals, assault, sequela Billable
T63.894S - Toxic effect of contact with other venomous animals, undetermined, sequela Billable
T63.91XS - Toxic effect of contact with unspecified venomous animal, accidental (unintentional), sequela Billable
T63.92XS - Toxic effect of contact with unspecified venomous animal, intentional self-harm, sequela Billable
T63.93XS - Toxic effect of contact with unspecified venomous animal, assault, sequela Billable
T63.94XS - Toxic effect of contact with unspecified venomous animal, undetermined, sequela Billable
T65.0X1S - Toxic effect of cyanides, accidental (unintentional), sequela Billable
T65.0X2S - Toxic effect of cyanides, intentional self-harm, sequela Billable
T65.0X3S - Toxic effect of cyanides, assault, sequela Billable
T65.0X4S - Toxic effect of cyanides, undetermined, sequela Billable
T65.1X1S - Toxic effect of strychnine and its salts, accidental (unintentional), sequela Billable
T65.1X2S - Toxic effect of strychnine and its salts, intentional self-harm, sequela Billable
T65.1X3S - Toxic effect of strychnine and its salts, assault, sequela Billable
T65.1X4S - Toxic effect of strychnine and its salts, undetermined, sequela Billable
T65.211S - Toxic effect of chewing tobacco, accidental (unintentional), sequela Billable
T65.212S - Toxic effect of chewing tobacco, intentional self-harm, sequela Billable
T65.213S - Toxic effect of chewing tobacco, assault, sequela Billable
T65.214S - Toxic effect of chewing tobacco, undetermined, sequela Billable
T65.221S - Toxic effect of tobacco cigarettes, accidental (unintentional), sequela Billable
T65.222S - Toxic effect of tobacco cigarettes, intentional self-harm, sequela Billable
T65.223S - Toxic effect of tobacco cigarettes, assault, sequela Billable
T65.224S - Toxic effect of tobacco cigarettes, undetermined, sequela Billable
T65.291S - Toxic effect of other tobacco and nicotine, accidental (unintentional), sequela Billable
T65.292S - Toxic effect of other tobacco and nicotine, intentional self-harm, sequela Billable
T65.293S - Toxic effect of other tobacco and nicotine, assault, sequela Billable
T65.294S - Toxic effect of other tobacco and nicotine, undetermined, sequela Billable
T65.3X1S - Toxic effect of nitroderivatives and aminoderivatives of benzene and its homologues, accidental (unintentional), sequela Billable
T65.3X2S - Toxic effect of nitroderivatives and aminoderivatives of benzene and its homologues, intentional self-harm, sequela Billable
T65.3X3S - Toxic effect of nitroderivatives and aminoderivatives of benzene and its homologues, assault, sequela Billable
T65.3X4S - Toxic effect of nitroderivatives and aminoderivatives of benzene and its homologues, undetermined, sequela Billable
T65.4X1S - Toxic effect of carbon disulfide, accidental (unintentional), sequela Billable
T65.4X2S - Toxic effect of carbon disulfide, intentional self-harm, sequela Billable
T65.4X3S - Toxic effect of carbon disulfide, assault, sequela Billable
T65.4X4S - Toxic effect of carbon disulfide, undetermined, sequela Billable
T65.5X1S - Toxic effect of nitroglycerin and other nitric acids and esters, accidental (unintentional), sequela Billable
T65.5X2S - Toxic effect of nitroglycerin and other nitric acids and esters, intentional self-harm, sequela Billable
T65.5X3S - Toxic effect of nitroglycerin and other nitric acids and esters, assault, sequela Billable
T65.5X4S - Toxic effect of nitroglycerin and other nitric acids and esters, undetermined, sequela Billable
T65.6X1S - Toxic effect of paints and dyes, not elsewhere classified, accidental (unintentional), sequela Billable
T65.6X2S - Toxic effect of paints and dyes, not elsewhere classified, intentional self-harm, sequela Billable
T65.6X3S - Toxic effect of paints and dyes, not elsewhere classified, assault, sequela Billable
T65.6X4S - Toxic effect of paints and dyes, not elsewhere classified, undetermined, sequela Billable
T65.811S - Toxic effect of latex, accidental (unintentional), sequela Billable
T65.812S - Toxic effect of latex, intentional self-harm, sequela Billable
T65.813S - Toxic effect of latex, assault, sequela Billable
T65.814S - Toxic effect of latex, undetermined, sequela Billable
T65.821S - Toxic effect of harmful algae and algae toxins, accidental (unintentional), sequela Billable
T65.822S - Toxic effect of harmful algae and algae toxins, intentional self-harm, sequela Billable
T65.823S - Toxic effect of harmful algae and algae toxins, assault, sequela Billable
T65.824S - Toxic effect of harmful algae and algae toxins, undetermined, sequela Billable
T65.831S - Toxic effect of fiberglass, accidental (unintentional), sequela Billable
T65.832S - Toxic effect of fiberglass, intentional self-harm, sequela Billable
T65.833S - Toxic effect of fiberglass, assault, sequela Billable
T65.834S - Toxic effect of fiberglass, undetermined, sequela Billable
T65.891S - Toxic effect of other specified substances, accidental (unintentional), sequela Billable
T65.892S - Toxic effect of other specified substances, intentional self-harm, sequela Billable
T65.893S - Toxic effect of other specified substances, assault, sequela Billable
T65.894S - Toxic effect of other specified substances, undetermined, sequela Billable
T65.91XS - Toxic effect of unspecified substance, accidental (unintentional), sequela Billable
T65.92XS - Toxic effect of unspecified substance, intentional self-harm, sequela Billable
T65.93XS - Toxic effect of unspecified substance, assault, sequela Billable
T65.94XS - Toxic effect of unspecified substance, undetermined, sequela Billable
