T78

Header — not billable

Adverse effects, not elsewhere classified

The ICD-10 code for adverse effects, not elsewhere classified is T78.

T78 is a non-billable header code. It groups related conditions but cannot be used on its own for reimbursement — select one of the 6 more specific codes below.

Clinical notes

Excludes2 (not included here)

An Excludes2 note means the excluded condition is not part of this one, but a patient can have both at the same time — in that case both codes may be reported together.

complications of surgical and medical care NEC (T80-T88)

7th character definitions

These definitions specify what each valid 7th-character value means for codes in this category.

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7th character note

This category requires a 7th character to indicate additional clinical detail (e.g. encounter type: initial, subsequent, sequela). The code is incomplete without it.

The appropriate 7th character is to be added to each code from category T78

Documentation support

General coding-documentation guidance — not a substitute for payer-specific requirements or professional coding judgment.

•This is a non-billable header code. Documentation must support a more specific child code before this diagnosis can be reported on a claim.
•This category requires a 7th character. Documentation should clearly indicate the episode of care (initial encounter, subsequent encounter, or sequela).
•As a general rule, code to the highest level of specificity supported by the documentation in the medical record.

T78

Clinical notes

Excludes2 (not included here)

7th character definitions

7th character note

Documentation support

Child codes under T78

Related codes in this category