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T54.1X4S ICD-10-CM Code: Toxic effect of other corrosive organic compounds, undetermined, sequela

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FY 2026 Apr update / Injury, poisoning and certain other consequences of external causes (S00-T88) / Toxic effects of substances chiefly nonmedicinal as to source (T51-T65)

T54.1X4S

Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidance

Toxic effect of other corrosive organic compounds, undetermined, sequela

Toxic effect of other corrosive organic compounds, undetermined, sequela

CMS-HCC V28

0

0

RAF 0

CMS-HCC V24

0

0

RAF 0

ACA/HHS

0

0

RAF 0

ESRD/PACE

0

0

RAF 0

RXHCC

0

0

RAF 0

Code Trumping

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Code Book Path

Official
T54.1XToxic effects of other corrosive organic compounds
T54.1X4Toxic effect of other corrosive organic compounds, undetermined
T54.1X4SToxic effect of other corrosive organic compounds, undetermined, sequela

Inclusion Terms

Official

ICD-10-CM does not list inclusion terms for T54.1X4S in this effective period.

Excludes 2

Official

ICD-10-CM does not list Excludes 2 notes for T54.1X4S in this effective period.

Related Child Codes

Official
T54.1X4AToxic effect of other corrosive organic compounds, undetermined, initial encounter
T54.1X4DToxic effect of other corrosive organic compounds, undetermined, subsequent encounter

Includes

Official

ICD-10-CM does not list Includes notes for T54.1X4S in this effective period.

Excludes 1

Official

ICD-10-CM does not list Excludes 1 notes for T54.1X4S in this effective period.

Code First

Official

ICD-10-CM does not list Code First sequencing instructions for T54.1X4S in this effective period.

Use Additional

Official

ICD-10-CM does not list Use Additional Code instructions for T54.1X4S in this effective period.

Code Also

Official

ICD-10-CM does not list Code Also instructions for T54.1X4S in this effective period.

Last updated: FY2026 ICD-10-CM Apr update, Apr 1, 2026 through Sep 30, 2026. CMS-HCC V28 is 100% phased in for payment year 2026.

Is T54.1X4S an HCC code?

No. T54.1X4S is a billable ICD-10-CM code but does not map to any HCC category in V28, V24, ESRD, or RxHCC.

This code does not map to an HCC category in any model (V28, V24, ESRD, RxHCC).

What This Code Means

T54.1X4S is the ICD-10-CM diagnosis code for toxic effect of other corrosive organic compounds, undetermined, sequela. T54.1X4S sits in the ICD-10-CM chapter for injury, poisoning and certain other consequences of external causes (s00-t88), within the section covering toxic effects of substances chiefly nonmedicinal as to source (t51-t65).

T54.1X4S is a billable ICD-10-CM code but does not map to a payment HCC under the CMS-HCC V28, V24, ESRD, or RxHCC risk adjustment models. It can be reported on Medicare Advantage encounter data submissions but it does not contribute to a beneficiary's RAF score and therefore does not affect risk-adjusted payments to the plan.

T54.1X4S is a billable ICD-10-CM code that can be reported on claims but does not currently contribute to a Medicare Advantage member's RAF score under any CMS risk adjustment model (V28, V24, ESRD, or RxHCC). Coders reviewing T54.1X4S should check whether additional documentation would support a more specific child code in the same hierarchy that does map to a payment HCC, capturing the correct specificity is the highest-impact RAF improvement available within accurate coding.

HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for T54.1X4S sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Child Codes

Code Hierarchy

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