T59.893AToxic effect of other specified gases, fumes and vapors, assault, initial encounter

T59.893A is the ICD-10-CM diagnosis code for toxic effect of other specified gases, fumes and vapors, assault, initial encounter. It belongs to category T59 (toxic effect of other gases, fumes and vapors), block T51-T65 (toxic effects of substances chiefly nonmedicinal as to source) and chapter 19 (injury, poisoning and certain other consequences of external causes). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

The 7th character "A" means initial encounter: use it while the patient is receiving active treatment for the condition.

It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.

In MS-DRG v44.0, it is part of the grouping logic for DRG 917 (Poisoning and Toxic Effects of Drugs with MCC, relative weight 1.57), DRG 918 (Poisoning and Toxic Effects of Drugs without MCC, relative weight 0.872), DRG 928 (Full Thickness Burn with Skin Graft or Inhalation Injury with CC/MCC, relative weight 7.6477), DRG 929 (Full Thickness Burn with Skin Graft or Inhalation Injury without CC/MCC, relative weight 3.0193) and DRG 934 (Full Thickness Burn without Skin Graft or Inhalation Injury, relative weight 1.9895), in MDC 21 (Injuries, Poisonings and Toxic Effects of Drugs) and MDC 22 (Burns), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

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

Before ICD-10, this condition was coded in ICD-9-CM as 987.9 (toxic effect of unspecified gas, fume, or vapor) and E962.2 (assault by other gases and vapors).