Skip to main content

T59.823A ICD-10-CM Code: Toxic effect of hexamethylene diisocyanate, assault, initial encounter

Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.

Code Set: New for FY2027 — not valid before October 1, 2026.

Official Registry Overview & Definition

No additional overview provided for this record.

Official Tabular Instructional Notes

Sequencing, inclusion, and exclusion notes published for T59.823A in the official ICD-10-CM tabular list.

Includes

Conditions the official ICD-10-CM tabular list includes under this code.

  • aerosol propellants

Excludes1 — Not Coded Here

Conditions generally not reported together with this code (Excludes1) -- an error unless the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).

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 Compared Codes

The official Excludes notes on T59.823A name these codes. Each comparison page covers when the two can — or must not — be reported together.

Change history

  • FY2027 — 2026-10-01
    Added to the code set
    Toxic effect of hexamethylene diisocyanate, assault, initial encounter
    FY2027 changes

Verify Before Coding

  • No Medicare Code Editor or MS-DRG Definitions Manual restrictions apply to this code.

From the code registry, the Medicare Code Editor, and the MS-DRG Definitions Manual. Check it against a full claim.

Relationships & Classification

Other codes that name T59.823A or its code family, from the CMS ICD-10-CM tabular instructional notes. Tabular-note edges are stored at the code family level that carries each note.

1 Excludes1 notes: T71 (via T59.-).

Related Codes

Same injury, other encounter phase

Same injury, coded at a different phase of treatment via the 7th character.

T59.823D — Toxic effect of hexamethylene diisocyanate, assault, subsequent encounter Compare T59.823A vs T59.823D →, T59.823S — Toxic effect of hexamethylene diisocyanate, assault, sequela Compare T59.823A vs T59.823S →

Contextual Map

Every relationship of T59.823A in one view: hierarchy, official tabular instructions in both directions, clinical classification, risk adjustment, MS-DRG participation, index terms and change history — each edge carrying the CMS source it derives from.

Hierarchy

  • S00-T88 — Chapter 19: Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88) (S00-T88) [Hierarchy]
  • T51-T65 — Toxic effects of substances chiefly nonmedicinal as to source [Hierarchy]

Referenced by Excludes1 notes

  • T71 — Asphyxiation [Excludes1](via T59.-): “asphyxia from other gases, fumes and vapors (T59.-)” · check together

Nearest codes (40)

  • T59 — Toxic effect of other gases, fumes and vapors [Sibling]
  • T59.812D — Toxic effect of smoke, intentional self-harm, subsequent encounter [Sibling]
  • T59.812S — Toxic effect of smoke, intentional self-harm, sequela [Sibling]
  • T59.813 — Toxic effect of smoke, assault [Sibling]
  • T59.813A — Toxic effect of smoke, assault, initial encounter [Sibling]
  • T59.813D — Toxic effect of smoke, assault, subsequent encounter [Sibling]
  • T59.813S — Toxic effect of smoke, assault, sequela [Sibling]
  • T59.814 — Toxic effect of smoke, undetermined [Sibling]
  • and 32 more

Change history

  • FY2027 — Added to the code set [Change history]

Frequently Asked Questions (FAQ) & Clinical Guidance

Does T59.823A require a 7th character?

Yes. The appropriate 7th character is to be added to each code from category T59.

Nearest Codes in This Family

Official ICD-10-CM classifications closest to T59.823A in its code family, with their registry titles.

  • T59.822 — Toxic effect of hexamethylene diisocyanate, intentional self-harm
  • T59.822A — Toxic effect of hexamethylene diisocyanate, intentional self-harm, initial encounter
  • T59.822D — Toxic effect of hexamethylene diisocyanate, intentional self-harm, subsequent encounter
  • T59.822S — Toxic effect of hexamethylene diisocyanate, intentional self-harm, sequela
  • T59.823 — Toxic effect of hexamethylene diisocyanate, assault
  • T59.823D — Toxic effect of hexamethylene diisocyanate, assault, subsequent encounter
  • T59.823S — Toxic effect of hexamethylene diisocyanate, assault, sequela
  • T59.824 — Toxic effect of hexamethylene diisocyanate, undetermined
  • T59.824A — Toxic effect of hexamethylene diisocyanate, undetermined, initial encounter
  • T59.824D — Toxic effect of hexamethylene diisocyanate, undetermined, subsequent encounter

View all codes in the T59 family