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ICD-10-CM 2027 diagnosis code

T52.1Toxic effects of benzene

Not billable — use a more specific codeRequires 7th character

T52.1 is a header code, so it can't be reported by itself. Choose one of the 1 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 T52.1

T52.1 is the ICD-10-CM diagnosis code for toxic effects of benzene. It belongs to category T52 (toxic effect of organic solvents), block T51-T65 (toxic effects of substances chiefly nonmedicinal as to source) 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 1 subcodes must be used instead.

Within T52 (toxic effect of organic solvents), T52.1 is specifically for toxic effects of benzene. Related codes cover petroleum products (T52.0), homologues of benzene (T52.2), glycols (T52.3), ketones (T52.4), other organic solvents (T52.8) and unspecified organic solvent (T52.9).

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 T52.1 together with the conditions in its Excludes1 note: homologues of benzene (T52.2) and nitroderivatives and aminoderivatives of benzene and its homologues (T65.3).

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 T52

  • Ainitial encounter
  • Dsubsequent encounter
  • Ssequela

Coding notes

Excludes1Not coded here — never report together with this code
  • homologues of benzene (T52.2)
  • nitroderivatives and aminoderivatives of benzene and its homologues (T65.3)

Notes that apply from higher levels

Instructions written at a parent level also apply to T52.1.

› From T52 Toxic effect of organic solvents
Excludes1
  • halogen derivatives of aliphatic and aromatic hydrocarbons (T53.-)

Broader instructions also apply from T51-T65 Toxic effects of substances chiefly nonmedicinal as to source and Chapter 19: Injury, poisoning and certain other consequences of external causes.

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 T52.1

Is T52.1 billable?

No. T52.1 is a header code. Report one of its more specific subcodes instead.