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ICD-10-CM 2027 diagnosis code

T45.2X4Poisoning by vitamins, undetermined

Not billable — use a more specific codeRequires 7th character

T45.2X4 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.

Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS, effective October 1, 2026. Updated September 29, 2026. About our data

About T45.2X4

T45.2X4 is the ICD-10-CM diagnosis code for poisoning by vitamins, undetermined. 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 T45.2X (poisoning by, adverse effect of and underdosing of vitamins), T45.2X4 is specifically for poisoning by vitamins, undetermined. Related codes cover poisoning by vitamins, accidental (unintentional) (T45.2X1), poisoning by vitamins, intentional self-harm (T45.2X2), poisoning by vitamins, assault (T45.2X3), adverse effect of vitamins (T45.2X5) and underdosing of vitamins (T45.2X6).

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.

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

Notes that apply from higher levels

Instructions written at a parent level also apply to T45.2X4.

› From T45.2 Poisoning by, adverse effect of and underdosing of vitamins
Excludes2
  • poisoning by, adverse effect of and underdosing of nicotinic acid (derivatives) (T46.7)
  • poisoning by, adverse effect of and underdosing of iron (T45.4)
  • poisoning by, adverse effect of and underdosing of vitamin K (T45.7)

Broader instructions also apply from 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.

Table of Drugs & Neoplasms entries

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about T45.2X4

Is T45.2X4 billable?

No. T45.2X4 is a header code. Report one of its more specific subcodes instead.