ICD-10-CM 2027 diagnosis code
T45.4X6Underdosing of iron and its compounds
T45.4X6 is a header code, so it can't be reported by itself. Choose one of the 3 more specific codes beneath it and add the required 7th character.
Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data
About T45.4X6
T45.4X6 is the ICD-10-CM diagnosis code for underdosing of iron and its compounds. It belongs to category T45 (poisoning by, adverse effect of and underdosing of primarily systemic and hematological agents, not elsewhere classified), block T36-T50 (poisoning by, adverse effects of and underdosing of drugs, medicaments and biological substances) and chapter 19 (injury, poisoning and certain other consequences of external causes). It is a header code, so it can't be reported by itself; one of its 3 subcodes must be used instead.
Within T45.4X (poisoning by, adverse effect of and underdosing of iron and its compounds), T45.4X6 is specifically for underdosing of iron and its compounds. Related codes cover poisoning by iron and its compounds, accidental (unintentional) (T45.4X1), poisoning by iron and its compounds, intentional self-harm (T45.4X2), poisoning by iron and its compounds, assault (T45.4X3), poisoning by iron and its compounds, undetermined (T45.4X4) and adverse effect of iron and its compounds (T45.4X5).
Codes in this range require a 7th character: A for initial encounter, D for subsequent encounter and S for sequela. Use placeholder "X" characters to fill any empty positions before the 7th character.
Don't report T45.4X6 together with the conditions in its Excludes1 note: iron deficiency (E61.1).
It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.
7th character
The appropriate 7th character is to be added to each code from category T45
Coding notes
- iron deficiency (E61.1)
Notes that apply from higher levels
Instructions written at a parent level also apply to T45.4X6.
Table of Drugs & Neoplasms entries
- Calcium › ferrous citrate — Underdosing
- Dextriferron — Underdosing
- Ferric › chloride — Underdosing
- Ferric › citrate — Underdosing
- Ferric › hydroxide › colloidal — Underdosing
- Ferric › hydroxide › polymaltose — Underdosing
- Ferric › pyrophosphate — Underdosing
- Ferritin — Underdosing
- Ferrocholinate — Underdosing
- Ferrodextrane — Underdosing
- Ferropolimaler — Underdosing
- Ferrous › phosphate — Underdosing
- Ferrous › salt — Underdosing
- Ferrous › salt › with folic acid — Underdosing
- Ferrous fumerate, gluconate, lactate, salt NEC, sulfate (medicinal) — Underdosing
- Iron (compounds) (medicinal) NEC — Underdosing
- Iron (compounds) (medicinal) NEC › ammonium — Underdosing
- Iron (compounds) (medicinal) NEC › dextran injection — Underdosing
- Iron (compounds) (medicinal) NEC › salts — Underdosing
- Iron (compounds) (medicinal) NEC › sorbitex — Underdosing
- Iron (compounds) (medicinal) NEC › sorbitol citric acid complex — Underdosing
- Isomaltose, ferric complex — Underdosing
- Jectofer — Underdosing
- Polyferose — Underdosing
- Sodium › iron edetate — Underdosing
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
- No changes since FY2016.
Common questions about T45.4X6
Is T45.4X6 billable?
- No. T45.4X6 is a header code. Report one of its more specific subcodes instead.