T88.3Malignant hyperthermia due to anesthesia

T88.3 is the ICD-10-CM diagnosis code for malignant hyperthermia due to anesthesia. It belongs to category T88 (other complications of surgical and medical care, not elsewhere classified), block T80-T88 (complications of surgical and medical care, not elsewhere classified) and chapter 19 (injury, poisoning and certain other consequences of external causes). It is a header code, so it can't be reported by itself; one of its 3 subcodes must be used instead.

Within T88 (other complications of surgical and medical care, not elsewhere classified), T88.3 is specifically for malignant hyperthermia due to anesthesia. Related codes cover infection following immunization (T88.0), other complications following immunization, not elsewhere classified (T88.1), shock due to anesthesia (T88.2), failed or difficult intubation (T88.4), other complications of anesthesia (T88.5), anaphylactic reaction due to adverse effect of correct drug or medicament properly administered (T88.6), unspecified adverse effect of drug or medicament (T88.7), other specified complications of surgical and medical care, not elsewhere classified (T88.8) and 1 more.

Codes in this range require a 7th character: A for initial encounter, D for subsequent encounter and S for sequela. Use placeholder "X" characters to fill any empty positions before the 7th character.

Use an additional code for adverse effect, if applicable, to identify drug (T41.- with fifth or sixth character 5).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.