T59.821 — Toxic effect of hexamethylene diisocyanate, accidental (unintentional)
Is T59.821 billable?
No — T59.821 is a non-billable header code. T59.821 groups more specific codes and cannot be submitted on a claim. A valid ICD-10-CM code must be reported at the highest level of specificity available in its branch. Select one of the 3 billable codes beneath T59.821.
Billable codes under this header
T59.821 at a glance
| Code | T59.821 |
|---|---|
| Description | Toxic effect of hexamethylene diisocyanate, accidental (unintentional) |
| Billable | No — header code |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Inclusion terms
Alternative wording in documentation that is classified to T59.821.
- Toxic effects of hexamethylene diisocyanate NOS
Excludes1 — never code together — inherited from T51-T65
The conditions below can never be reported together with T59.821 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
- contact with and (suspected) exposure to toxic substances (Z77.-)
Excludes1 — never code together — inherited from T59
The conditions below can never be reported together with T59.821 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
- chlorofluorocarbons (T53.5)
Use additional code — inherited from Chapter 19
Report an additional code alongside T59.821 to fully describe the condition. T59.821 is sequenced first.
- code to identify any retained foreign body, if applicable (Z18.-)
Use additional code — inherited from T51-T65
Report an additional code alongside T59.821 to fully describe the condition. T59.821 is sequenced first.
Excludes2 — not included here — inherited from Chapter 19
The conditions below are not part of T59.821, but a patient may have both at the same time. When documentation supports it, T59.821 and the excluded code may both be reported.