2027 ICD-10-CM Diagnosis Code T45.4X3APoisoning by iron and its compounds, assault, initial encounter

When coding a poisoning or reaction to the improper use of a medication (e.g., overdose, wrong substance given or taken in error, wrong route of administration), first assign the appropriate code from categories T36-T50. The poisoning codes have an associated intent as their 5th or 6th character (accidental, intentional self-harm, assault and undetermined). If the intent of the poisoning is unknown or unspecified, code the intent as accidental intent. The undetermined intent is only for use if the documentation in the record specifies that the intent cannot be determined. Use additional code(s) for all manifestations of poisonings.

The appropriate 7th character is to be added to each code from block Poisoning by, adverse effect of and underdosing of primarily systemic and hematological agents, not elsewhere classified (T45). Use the following options for the applicable episode of care:

• A - initial encounter
• D - subsequent encounter
• S - sequela

Source: ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027, published by CMS and the National Center for Health Statistics.

Instructions from the official ICD-10-CM Tabular List that apply to T45.4X3A: its own notes plus those printed at T45, block T36-T50, and Chapter 19. A note printed at a category, block or chapter applies to every code under it.

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Instructional notes printed at other codes that name T45.4X3A, its category, or a range that includes it.