T59.823SUpcomingBillable / specificExempt from present-on-admission reporting

Toxic effect of hexamethylene diisocyanate, assault, sequela

Chapters 19 · Inherited instructions

Use additional code

code to identify any retained foreign body, if applicable (Z18.-)

T51-T65 · Inherited instructions

Use additional code

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.-)

Excludes 1

contact with and (suspected) exposure to toxic substances (Z77.-)

T59 · Inherited instructions

Excludes 1

chlorofluorocarbons (T53.5)

A — initial encounter

D — subsequent encounter

S — sequela

Excludes 2 · 2

Chapters 19 · Injury, poisoning and certain other consequences of external causes (S00-T88)

Excludes 2

birth trauma (P10-P15)
obstetric trauma (O70-O71)

Claims & coverage

Coverage depends on the payer, service and applicable policy. A billable code does not guarantee payment.

When ICD-10-CM is required

For US diagnosis claims covered by HIPAA, ICD-10-CM is required from October 1, 2015.

Use the service date for outpatient/professional claims and the discharge date for hospital inpatient claims. Earlier encounters use ICD-9-CM; each individual code must also be valid for the applicable date.

Official coding guidelines → · CMS ↗

Check Medicare coverage ↗

First observed · 2026-10-01

Code history

Latest recorded change · FY2027

ChangedUnchanged

FY2027UpcomingSelected edition

Effective from 2026-10-01

Added

Toxic effect of hexamethylene diisocyanate, assault, sequela

Billable diagnosis code

CDC/NCHS · FY2027

All editions (1)

All editions	Effective from	Code history
FY2027	2026-10-01	Added

Code-level instructions

The official Tabular List has no additional instructions at this code level.

Review the instructions inherited from its parent categories below. Inherited instructions ↓

Review the official coding guidelines ↗

Inherited instructions

Chapters 19 · Injury, poisoning and certain other consequences of external causes (S00-T88)

Excludes 2

birth trauma (P10-P15)
obstetric trauma (O70-O71)

Use additional code

code to identify any retained foreign body, if applicable (Z18.-)

Note

Use secondary code(s) from Chapter 20, External causes of morbidity, to indicate cause of injury. Codes within the T section that include the external cause do not require an additional external cause code
The chapter uses the S-section for coding different types of injuries related to single body regions and the T-section to cover injuries to unspecified body regions as well as poisoning and certain other consequences of external causes.

T51-T65 · Toxic effects of substances chiefly nonmedicinal as to source (T51-T65)

Excludes 1

contact with and (suspected) exposure to toxic substances (Z77.-)

Use additional code

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.-)

Note

When no intent is indicated code to accidental. Undetermined intent is only for use when there is specific documentation in the record that the intent of the toxic effect cannot be determined.

T59 · Toxic effect of other gases, fumes and vapors

Includes

aerosol propellants

Excludes 1

chlorofluorocarbons (T53.5)

Seventh character

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

A — initial encounter

D — subsequent encounter

S — sequela

Official conversion history

Historical assignments from the CDC conversion table support data retrieval. They do not authorize substituting a previous code for the current code.

Release dates 2026-10-01

Previous assignment: T59.893S

Related codes

Other entries in the same category; these are not automatic substitutes.

Code	Description	Category · further specificity required
T59.823A	Toxic effect of hexamethylene diisocyanate, assault, initial encounter	Billable / specific
T59.823D	Toxic effect of hexamethylene diisocyanate, assault, subsequent encounter	Billable / specific

Official titles and instructions are preserved in their source language. Official sources ↗

T51-T65 · Inherited instructions

Use additional code

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.-)

Excludes 1

contact with and (suspected) exposure to toxic substances (Z77.-)

Claims & coverage

Coverage depends on the payer, service and applicable policy. A billable code does not guarantee payment.

When ICD-10-CM is required

For US diagnosis claims covered by HIPAA, ICD-10-CM is required from October 1, 2015.

Official coding guidelines → · CMS ↗

Check Medicare coverage ↗

All editions

Effective from

Code history

FY2027

2026-10-01

Added

Inherited instructions

Chapters 19 · Injury, poisoning and certain other consequences of external causes (S00-T88)

Excludes 2

birth trauma (P10-P15)
obstetric trauma (O70-O71)

Use additional code

code to identify any retained foreign body, if applicable (Z18.-)

Note

Use secondary code(s) from Chapter 20, External causes of morbidity, to indicate cause of injury. Codes within the T section that include the external cause do not require an additional external cause code
The chapter uses the S-section for coding different types of injuries related to single body regions and the T-section to cover injuries to unspecified body regions as well as poisoning and certain other consequences of external causes.

T51-T65 · Toxic effects of substances chiefly nonmedicinal as to source (T51-T65)

Excludes 1

contact with and (suspected) exposure to toxic substances (Z77.-)

Use additional code

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.-)

Note

When no intent is indicated code to accidental. Undetermined intent is only for use when there is specific documentation in the record that the intent of the toxic effect cannot be determined.

T59 · Toxic effect of other gases, fumes and vapors

Includes

aerosol propellants

Excludes 1

chlorofluorocarbons (T53.5)

Seventh character

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

A — initial encounter

D — subsequent encounter

S — sequela

Related codes

Other entries in the same category; these are not automatic substitutes.

Code	Description	Category · further specificity required
T59.823A	Toxic effect of hexamethylene diisocyanate, assault, initial encounter	Billable / specific
T59.823D	Toxic effect of hexamethylene diisocyanate, assault, subsequent encounter	Billable / specific

Official titles and instructions are preserved in their source language. Official sources ↗