T88.3 Malignant hyperthermia due to anesthesia

✓ Billable ICD-10-CM 2026
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The ICD-10-CM code for Malignant hyperthermia due to anesthesia is T88.3 (FY2026). It is a billable, claim-ready diagnosis code.

Classification

Section
T80-T88: Complications of surgical and medical care, not elsewhere classified (T80-T88)
Category T88
15 codes (13 billable)
FY2026 Status
Stable since FY2024

Also Known As

ICD-10-CM Alphabetic Index entries that lead to T88.3:

  • Hyperthermia (of unknown origin) › malignant, due to anesthesia
  • Hyperpyrexia › malignant, due to anesthetic
  • Complication (s) (from) (of) › anesthesia, anesthetic › hyperthermia, malignant
  • Complication (s) (from) (of) › anesthesia, anesthetic › malignant hyperthermia
Use Additional Code
  • code for adverse effect, if applicable, to identify drug (T41.- with fifth or sixth character 5)

Official Coding Guidelines

Sequence blood vessel/nerve injury first (fragment)

injury is to the blood vessels or nerves, that injury should be sequenced first.

— ICD-10-CM Official Guidelines for Coding and Reporting, FY2026, Section I.C.19.b.2
Do not assign injury codes for iatrogenic injuries; code complication

3) Iatrogenic injuries Injury codes from Chapter 19 should not be assigned for injuries that occur during, or as a result of, a medical intervention. Assign the appropriate complication code(s).

— ICD-10-CM Official Guidelines for Coding and Reporting, FY2026, Section I.C.19.b.3

Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026

References

Related Codes

Parent Code

T88 Other complications of surgical and medical care, not elsewhere classified

Related Codes in T88

T88 Other complications of surgical and medical care, not elsewhere classified T88.0 Infection following immunization T88.1 Other complications following immunization, not elsewhere classified T88.2 Shock due to anesthesia T88.4 Failed or difficult intubation T88.5 Other complications of anesthesia T88.51 Hypothermia following anesthesia T88.52 Failed moderate sedation during procedure T88.53 Unintended awareness under general anesthesia during procedure T88.59 Other complications of anesthesia T88.6 Anaphylactic reaction due to adverse effect of correct drug or medicament properly administered T88.7 Unspecified adverse effect of drug or medicament T88.8 Other specified complications of surgical and medical care, not elsewhere classified T88.9 Complication of surgical and medical care, unspecified
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Reviewed by Prajwal Shrestha, CPC, CRC
Certified Professional Coder (CPC) and Certified Risk Adjustment Coder (CRC) · AAPC Member ID 01997614 · About · Editorial policy · Content last reviewed: 2025-10-01

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