T36-T50: Poisoning by, adverse effects of and underdosing of drugs, medicaments and biological substances

ICD-10-CM 2027 block T36-T50 in chapter 19 (Injury, poisoning and certain other consequences of external causes) has 15 categories.

T36 – Poisoning by, adverse effect of and underdosing of systemic antibiotics 198 billable codes
T37 – Poisoning by, adverse effect of and underdosing of other systemic anti-infectives and antiparasitics 144 billable codes
T38 – Poisoning by, adverse effect of and underdosing of hormones and their synthetic substitutes and antagonists, not elsewhere classified 234 billable codes
T39 – Poisoning by, adverse effect of and underdosing of nonopioid analgesics, antipyretics and antirheumatics 162 billable codes
T40 – Poisoning by, adverse effect of and underdosing of narcotics and psychodysleptics [hallucinogens] 258 billable codes
T41 – Poisoning by, adverse effect of and underdosing of anesthetics and therapeutic gases 126 billable codes
T42 – Poisoning by, adverse effect of and underdosing of antiepileptic, sedative- hypnotic and antiparkinsonism drugs 162 billable codes
T43 – Poisoning by, adverse effect of and underdosing of psychotropic drugs, not elsewhere classified 354 billable codes
T44 – Poisoning by, adverse effect of and underdosing of drugs primarily affecting the autonomic nervous system 198 billable codes
T45 – Poisoning by, adverse effect of and underdosing of primarily systemic and hematological agents, not elsewhere classified 270 billable codes
T46 – Poisoning by, adverse effect of and underdosing of agents primarily affecting the cardiovascular system 198 billable codes
T47 – Poisoning by, adverse effect of and underdosing of agents primarily affecting the gastrointestinal system 180 billable codes
T48 – Poisoning by, adverse effect of and underdosing of agents primarily acting on smooth and skeletal muscles and the respiratory system 180 billable codes
T49 – Poisoning by, adverse effect of and underdosing of topical agents primarily affecting skin and mucous membrane and by ophthalmological, otorhinorlaryngological and dental drugs 180 billable codes
T50 – Poisoning by, adverse effect of and underdosing of diuretics and other and unspecified drugs, medicaments and biological substances 342 billable codes

Block notes

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):

toxic reaction to local anesthesia in pregnancy (O29.3-)

Excludes2 (not included here):

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-)

Notes:

The drug giving rise to the adverse effect should be identified by use of codes from categories T36-T50 with fifth or sixth character 5.