2026 ICD-10-CM Diagnosis Code S20.20XSContusion of thorax, unspecified, sequela
S20.20XS is a billable ICD-10-CM diagnosis code for contusion of thorax, unspecified, sequela. The 7th character S marks it as a sequela code, which reports a problem that remains after the original condition has resolved. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 604 through 605. The code is exempt from POA reporting. Coders also document this condition as contusion of left chest wall. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Injury, sequela.
Code Identity
Code Classification
Present on Admission (POA)Billing
S20.20XS is exempt from POA reporting on inpatient claims to general acute care hospitals. Review the other POA exempt codes in Injuries to the thorax (S20-S29).
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Contusion of left chest wall
- Contusion of left rib
- Contusion of rib
- Contusion of right chest wall
- Contusion of right rib
Coding GuidelinesGuidance
The appropriate 7th character is to be added to each code from block Superficial injury of thorax (S20). Use the following options for the applicable episode of care:
- A - initial encounter
- D - subsequent encounter
- S - sequela
Source: ICD-10-CM Official Guidelines for Coding and Reporting, FY 2026, published by CMS and the National Center for Health Statistics.
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Bruises
A bruise is a mark on your skin caused by blood trapped under the surface. It happens when an injury crushes small blood vessels but does not break the skin. Those vessels break open and leak blood under the skin.
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Convert S20.20XS to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About S20.20XSOverview
What is the ICD-10 code for contusion of thorax, unspecified, sequela?
The ICD-10-CM code for contusion of thorax, unspecified, sequela is S20.20XS (sometimes written as S2020XS). It is billable on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
Is S20.20XS (Contusion of thorax, unspecified) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report contusion of thorax, unspecified, sequela on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What does the 7th character S in S20.20XS mean?
The final character S makes this a sequela code: it reports a lingering problem that remains after the contusion of thorax, unspecified itself has resolved, not the original event.
What MS-DRG does S20.20XS group to?
When contusion of thorax, unspecified, sequela is the principal diagnosis on an inpatient stay, it groups to MS-DRG 604, 605, with relative weights from 0.9160 to 1.4721 depending on complications. Higher weights mean higher Medicare reimbursement.
Is S20.20XS exempt from POA reporting?
Yes. CMS lists this code among those exempt from present on admission reporting, so hospitals do not assign a POA indicator for contusion of thorax, unspecified, sequela on inpatient claims. The code appears in the Injuries to the thorax (S20-S29) range of the CMS exempt list.
