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ICD-10-CM 2027 diagnosis code

T52.814SToxic effect of alkenes, undetermined, sequela

✓ Billable / specificNew for 2027POA exemptRequires 7th character

T52.814S is a valid, billable ICD-10-CM code for toxic effect of alkenes, undetermined, sequela. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

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

About T52.814S

T52.814S is the ICD-10-CM diagnosis code for toxic effect of alkenes, undetermined, sequela. 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 billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

The 7th character "S" means sequela: use it for complications or conditions that arise as a direct result of the original condition.

It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.

In MS-DRG v44.0, it is part of the grouping logic for DRG 922 (Other Injury, Poisoning and Toxic Effect Diagnoses with MCC, relative weight 1.6238) and DRG 923 (Other Injury, Poisoning and Toxic Effect Diagnoses without MCC, relative weight 0.9973), in MDC 21 (Injuries, Poisonings and Toxic Effects of Drugs), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

It is exempt from present-on-admission (POA) reporting, so no POA indicator is required.

It was added in FY2027, effective October 1, 2026.

7th character

Ssequela

Other encounter types for T52.814:

Notes that apply from higher levels

Instructions written at a parent level also apply to T52.814S.

› 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.

MS-DRG v44.0 grouping

All DRGs →

Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.

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
  • FY2027 (effective 10/1/2026): Added

Common questions about T52.814S

Is T52.814S billable?

Yes. T52.814S is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

What does the "S" at the end of T52.814S mean?

It is the 7th character for sequela. Per the official guidelines, use it for complications or conditions that arise as a direct result of the original condition.

Can T52.814S be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict T52.814S as a principal diagnosis.

Is T52.814S a CC or MCC?

No. T52.814S is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does T52.814S group to?

T52.814S is used in the MS-DRG v44.0 logic for MS-DRG 922 (Other Injury, Poisoning and Toxic Effect Diagnoses with MCC) and MS-DRG 923 (Other Injury, Poisoning and Toxic Effect Diagnoses without MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.

Did T52.814S change for 2027?

Yes. For FY2027 (effective October 1, 2026) it was added to the code set.