T58.93XA ICD-10-CM Code: Toxic effect of carbon monoxide from unspecified source, assault, initial encounter
Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.
Inpatient Payment Groups (MS-DRG)
MS-DRGs this diagnosis helps define, as principal or secondary, per the CMS ICD-10-CM/PCS MS-DRG Definitions Manual v43.0 (FY2026), Appendix B.
- MS-DRG 917 — POISONING AND TOXIC EFFECTS OF DRUGS WITH MCC (MDC 21)
- MS-DRG 918 — POISONING AND TOXIC EFFECTS OF DRUGS WITHOUT MCC (MDC 21)
A diagnosis appearing in a group's logic does not by itself determine the DRG assigned to a stay; the grouper uses the full claim.
Code Set: Valid FY2026 and FY2027. FY2026 took effect October 1, 2025.
Official Registry Overview & Definition
Official Tabular Instructional Notes
Sequencing, inclusion, and exclusion notes published for T58.93XA in the official ICD-10-CM tabular list.
Includes
Conditions the official ICD-10-CM tabular list includes under this code.
- asphyxiation from carbon monoxide
- toxic effect of carbon monoxide from all sources
Excludes1 — Not Coded Here
Conditions that can never be reported with this code; the two are mutually exclusive.
- contact with and (suspected) exposure to toxic substances (Z77.-)
Use Additional Code
Supplementary codes the tabular list directs you to add.
- Use additional code(s):
- for all associated manifestations of toxic effect, such as: respiratory conditions due to external agents (J60-J70)
- personal history of foreign body fully removed (Z87.821)
- to identify any retained foreign body, if applicable (Z18.-)
Frequently Asked Questions (FAQ) & Clinical Guidance
Does T58.93XA require a 7th character?
Yes. The appropriate 7th character is to be added to each code from category T58.
Nearest Codes in This Family
Official ICD-10-CM classifications closest to T58.93XA in its code family, with their registry titles.
- T58.92 — Toxic effect of carbon monoxide from unspecified source, intentional self-harm
- T58.92XA — Toxic effect of carbon monoxide from unspecified source, intentional self-harm, initial encounter
- T58.92XD — Toxic effect of carbon monoxide from unspecified source, intentional self-harm, subsequent encounter
- T58.92XS — Toxic effect of carbon monoxide from unspecified source, intentional self-harm, sequela
- T58.93 — Toxic effect of carbon monoxide from unspecified source, assault
- T58.93XD — Toxic effect of carbon monoxide from unspecified source, assault, subsequent encounter
- T58.93XS — Toxic effect of carbon monoxide from unspecified source, assault, sequela
- T58.94 — Toxic effect of carbon monoxide from unspecified source, undetermined
- T58.94XA — Toxic effect of carbon monoxide from unspecified source, undetermined, initial encounter
- T58.94XD — Toxic effect of carbon monoxide from unspecified source, undetermined, subsequent encounter