T41.4

Poisoning by, adverse effect of and underdosing of unspecified anesthetic

Header / non-billable

This code does not map to a risk-adjusting HCC in the loaded models.

Coding notes

Excludes 1 never coded together · Excludes 2 may co-exist

Inherited from T41Anesthetics and therapeutic gases
Excludes 1

benzodiazepines (T42.4-) cocaine (T40.5-) complications of anesthesia during pregnancy (O29.-) complications of anesthesia during labor and delivery (O74.-) complications of anesthesia during the puerperium (O89.-) opioids (T40.0-T40.2-)

7th character

The appropriate 7th character is to be added to each code from category T41

Valid 7th characters and their meanings
CharacterMeaning
Ainitial encounter
Dsubsequent encounter
Ssequela
Inherited from T36-T50Poisoning by, adverse effects of and underdosing of drugs, medicaments and biological substances
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

Excludes 1

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

Excludes 2

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)

Use additional

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-)

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)

Note

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.

Inherited from chapter 19Injury, poisoning and certain other consequences of external causes
Excludes 2

birth trauma (P10-P15) obstetric trauma (O70-O71)

Use additional

code to identify any retained foreign body, if applicable (Z18.-)

Note

Use secondary code(s) from Chapter 20, External causes of morbidity, to indicate cause of injury. Codes within the T section that include the external cause do not require an additional external cause code The chapter uses the S-section for coding different types of injuries related to single body regions and the T-section to cover injuries to unspecified body regions as well as poisoning and certain other consequences of external causes. (T07-T88) Injury, poisoning and certain other consequences of external causes (T07-T88) (T20-T32) Burns and corrosions (T20-T32) Includes: burns (thermal) from electrical heating appliances burns (thermal) from electricity burns (thermal) from flame burns (thermal) from friction burns (thermal) from hot air and hot gases burns (thermal) from hot objects burns (thermal) from lightning burns (thermal) from radiation chemical burn [corrosion] (external) (internal) scalds Excludes2: erythema [dermatitis] ab igne (L59.0) radiation-related disorders of the skin and subcutaneous tissue (L55-L59) sunburn (L55.-)

Official Guidelines for T41.4

FY 2026 ›