ICD-10-CM 2027 diagnosis code
T52.813DToxic effect of alkenes, assault, subsequent encounter
T52.813D is a valid, billable ICD-10-CM code for toxic effect of alkenes, assault, subsequent encounter. 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 T52.813D
T52.813D is the ICD-10-CM diagnosis code for toxic effect of alkenes, assault, subsequent encounter. 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 "D" means subsequent encounter: use it for encounters after active treatment, while the patient is healing or recovering.
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 949 (Aftercare with CC/MCC, relative weight 1.123) and DRG 950 (Aftercare without CC/MCC, relative weight 0.7664), in MDC 23 (Factors Influencing Health Status and Other Contacts with Health Services), 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
Dsubsequent encounter
Other encounter types for T52.813:
Notes that apply from higher levels
Instructions written at a parent level also apply to T52.813D.
› From T52 Toxic effect of organic solvents
- 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.
MDC 23 · Factors Influencing Health Status and Other Contacts with Health Services
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2027 (effective 10/1/2026): Added
Common questions about T52.813D
Is T52.813D billable?
- Yes. T52.813D is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
What does the "D" at the end of T52.813D mean?
- It is the 7th character for subsequent encounter. Per the official guidelines, use it for encounters after active treatment, while the patient is healing or recovering.
Can T52.813D be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict T52.813D as a principal diagnosis.
Is T52.813D a CC or MCC?
- No. T52.813D is neither a CC nor an MCC under MS-DRG v44.0.
What DRG does T52.813D group to?
- T52.813D is used in the MS-DRG v44.0 logic for MS-DRG 949 (Aftercare with CC/MCC) and MS-DRG 950 (Aftercare without CC/MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.
Did T52.813D change for 2027?
- Yes. For FY2027 (effective October 1, 2026) it was added to the code set.