2027 ICD-10-CM Diagnosis Code T45.4X1SPoisoning by iron and its compounds, accidental (unintentional), sequela

ICD-10-CM T45.4X1S

CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

T45.4X1S is a billable ICD-10-CM diagnosis code for poisoning by iron and its compounds, accidental (unintentional), sequela. The 7th character S marks it as a sequela code, which reports a problem that remains after the original condition has resolved. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 922 through 923. The code is exempt from POA reporting. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Poisoning/toxic effect/adverse effects/underdosing, sequela.

Code Identity

ICD-10-CM Code

T45.4X1S

Billable Status

Yes — Valid for Submission

Code Describes

Poisoning by iron and its compounds, accidental (unintentional), sequela

Short Description

Poisoning by iron and its compounds, accidental, sequela

Parent Code

T45.4X1

Poisoning by iron and its compounds, accidental (unintentional)

Code Classification

ChapterS00–T88Injury, poisoning and certain other consequences of external causes

SectionT36-T50Poisoning by, adverse effect of and underdosing of drugs, medicaments and biological substances

CategoryT45Poisoning by, adverse effect of and underdosing of primarily systemic and hematological agents, not elsewhere classified

This CodeT45.4X1SPoisoning by iron and its compounds, accidental (unintentional), sequela

Present on Admission (POA)Billing

T45.4X1S is exempt from POA reporting on inpatient claims to general acute care hospitals. Review the other POA exempt codes in Poisoning by, adverse effect of and underdosing of drugs, medicaments and biological substances (T36-T50).

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

Accidental ferric iron compound poisoning
Accidental ferrous sulfate overdose
Accidental ferrous sulfate poisoning
Accidental poisoning by iron compounds
Ferrous sulfate overdose
Hypopituitarism due to iron overload
Iron and/or iron compound overdose
Iron dextran toxicity
Poisoning by ferrous salt
Poisoning by ferrous sulfate
Poisoning by iron
Poisoning caused by ferric iron compound
Poisoning caused by iron and/or iron compound
Toxic effect of iron compound

Coding GuidelinesGuidance

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.

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to T45.4X1S: 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.