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X30.XXXS ICD-10-CM Code: Exposure to excessive natural heat, sequela

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FY 2026 Apr update / External causes of morbidity (V00-Y99) / Exposure to forces of nature (X30-X39)

X30.XXXS

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

Exposure to excessive natural heat, sequela

Exposure to excessive natural heat, 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
X30XXXExposure to forces of nature (X30-X39)
X30.XXXSExposure to excessive natural heat, sequela

Inclusion Terms

Official

ICD-10-CM does not list inclusion terms for X30.XXXS in this effective period.

Excludes 2

Official

ICD-10-CM does not list Excludes 2 notes for X30.XXXS in this effective period.

Related Child Codes

Official
X30.XXXAExposure to excessive natural heat, initial encounter
X30.XXXDExposure to excessive natural heat, subsequent encounter

Includes

Official

ICD-10-CM does not list Includes notes for X30.XXXS in this effective period.

Excludes 1

Official

ICD-10-CM does not list Excludes 1 notes for X30.XXXS in this effective period.

Code First

Official

ICD-10-CM does not list Code First sequencing instructions for X30.XXXS in this effective period.

Use Additional

Official

ICD-10-CM does not list Use Additional Code instructions for X30.XXXS in this effective period.

Code Also

Official

ICD-10-CM does not list Code Also instructions for X30.XXXS 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 X30.XXXS an HCC code?

No. X30.XXXS 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

X30.XXXS is the ICD-10-CM diagnosis code for exposure to excessive natural heat, sequela. X30.XXXS sits in the ICD-10-CM chapter for external causes of morbidity (v00-y99), within the section covering exposure to forces of nature (x30-x39).

X30.XXXS 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.

X30.XXXS 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 X30.XXXS 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 X30.XXXS sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Child Codes

Code Hierarchy

X30.XXXSExposure to excessive natural heat, sequela
X30.XXXSExposure to excessive natural heat, sequela

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