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ICD-10-CM 2027 diagnosis code

T46.1X6Underdosing of calcium-channel blockers

Not billable — use a more specific codeRequires 7th character

T46.1X6 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 T46.1X6

T46.1X6 is the ICD-10-CM diagnosis code for underdosing of calcium-channel blockers. It belongs to category T46 (poisoning by, adverse effect of and underdosing of agents primarily affecting the cardiovascular system), 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 T46.1X (poisoning by, adverse effect of and underdosing of calcium-channel blockers), T46.1X6 is specifically for underdosing of calcium-channel blockers. Related codes cover poisoning by calcium-channel blockers, accidental (unintentional) (T46.1X1), poisoning by calcium-channel blockers, intentional self-harm (T46.1X2), poisoning by calcium-channel blockers, assault (T46.1X3), poisoning by calcium-channel blockers, undetermined (T46.1X4) and adverse effect of calcium-channel blockers (T46.1X5).

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 T46

Notes that apply from higher levels

Instructions written at a parent level also apply to T46.1X6.

› From T46 Poisoning by, adverse effect of and underdosing of agents primarily affecting the cardiovascular system
Excludes1
  • poisoning by, adverse effect of and underdosing of metaraminol (T44.4)

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 T46.1X6

Is T46.1X6 billable?

No. T46.1X6 is a header code. Report one of its more specific subcodes instead.