2026 ICD-10-CM Diagnosis Code S21.95XSOpen bite of unspecified part of thorax, sequela
S21.95XS is a billable ICD-10-CM diagnosis code for open bite of unspecified part of thorax, 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 open bite of thorax. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Injury, sequela.
Code Identity
Code Classification
Present on Admission (POA)Billing
S21.95XS 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.
- Open bite of thorax
Coding GuidelinesGuidance
The appropriate 7th character is to be added to each code from block Open wound of thorax (S21). 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
Animal Bites
Wild animals usually avoid people. They might attack, however, if they feel threatened, are sick, or are protecting their young or territory. Attacks by pets are more common. Animal bites rarely are life-threatening, but if they become infected, you can develop serious medical problems.
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Convert S21.95XS to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About S21.95XSOverview
What is the ICD-10 code for open bite of unspecified part of thorax, sequela?
The ICD-10-CM code for open bite of unspecified part of thorax, sequela is S21.95XS (sometimes written as S2195XS). It is billable on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
Is S21.95XS (Open bite of unspecified part of thorax) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report open bite of unspecified part of thorax, sequela on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What does the 7th character S in S21.95XS mean?
The final character S makes this a sequela code: it reports a lingering problem that remains after the open bite of unspecified part of thorax itself has resolved, not the original event.
What MS-DRG does S21.95XS group to?
When open bite of unspecified part of thorax, 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 S21.95XS 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 open bite of unspecified part of thorax, sequela on inpatient claims. The code appears in the Injuries to the thorax (S20-S29) range of the CMS exempt list.
