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T36 vs T86.8493

T36 (Poisoning by, adverse effect of and underdosing of systemic antibiotics) compared with T86.8493 (Unspecified complication of corneal transplant, bilateral), from the official CMS tabular data. Both may be reported when both conditions are documented (Excludes2).

Relationship

Sequencing

Additional-code relationship

T86.8493
Unspecified complication of corneal transplant, bilateral
→
T36
Poisoning by, adverse effect of and underdosing of systemic antibiotics

Add a secondary code when documented.

“code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5)”

A "Use additional code" note means a secondary code should follow this one to fully describe the condition when the documentation supports it.

Source: CMS ICD-10-CM tabular instructional notes

Informational

Excludes2 relationship

T86.8493
Unspecified complication of corneal transplant, bilateral
↔
T36
Poisoning by, adverse effect of and underdosing of systemic antibiotics

Distinct conditions — both may be reported.

“poisoning and toxic effects of drugs and chemicals (T36-T65 with fifth or sixth character 1-4 or 6)”

An Excludes2 note means the excluded condition is not part of the code above it, but a patient can have both. Report both when both are documented.

Source: CMS ICD-10-CM tabular instructional notes

Can these codes be reported together?

Yes, when both are documented. T86.8493 carries an Excludes2 note covering T36: “poisoning and toxic effects of drugs and chemicals (T36-T65 with fifth or sixth character 1-4 or 6)”

Excludes2 marks distinct conditions — both may be reported when both are documented.

Sequencing on the claim

1stT86.8493  then  T36

T86.8493 carries a Use Additional Code instruction covering T36: “code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5)”

Side by side

T36Poisoning by, adverse effect of and underdosing of systemic antibioticsT86.8493Unspecified complication of corneal transplant, bilateral
Billing statusNon-billable header

Report instead: T36.0X1A, T36.0X1D, T36.0X1S, T36.0X2A, T36.0X2D

Billable
ClassificationS00-T88 — Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88)S00-T88 — Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88)
DefinitionPoisoning by, adverse effect of and underdosing of systemic antibiotics is a non-billable ICD-10-CM category code (T36).Unspecified complication of corneal transplant, bilateral is a billable ICD-10-CM diagnosis code (T86.8493).
7th characterThe appropriate 7th character is to be added to each code from category T36—
Includes
adverse effect of correct substance properly administered
poisoning by overdose of substance
poisoning by wrong substance given or taken in error
underdosing by (inadvertently) (deliberately) taking less substance than prescribed or instructed
—
Use additional code
code(s) to specify:
manifestations of poisoning
underdosing or failure in dosage during medical and surgical care (Y63.6, Y63.8-Y63.9)
code to identify other transplant complications, such as:
graft-versus-host disease (D89.81-)
malignancy associated with organ transplant (C80.2)
Code first
, for adverse effects, the nature of the adverse effect, such as:
adverse effect NOS (T88.7)
—
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Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources