2026 ICD-10-CM Diagnosis Code S91.051SOpen bite, right ankle, sequela
S91.051S is a billable ICD-10-CM diagnosis code for open bite, right ankle, 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 dog bite of ankle. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Injury, sequela.
Code Identity
Code Classification
Present on Admission (POA)Billing
S91.051S is exempt from POA reporting on inpatient claims to general acute care hospitals. Review the other POA exempt codes in Injuries to the ankle and foot (S90-S99).
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Dog bite of ankle
- Open bite of ankle
- Open wound of right ankle due to cat bite
- Open wound of right ankle due to dog bite
Coding GuidelinesGuidance
The appropriate 7th character is to be added to each code from block Open wound of ankle, foot and toes (S91). 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 S91.051S to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About S91.051SOverview
What is the ICD-10 code for open bite, right ankle, sequela?
The ICD-10-CM code for open bite, right ankle, sequela is S91.051S (sometimes written as S91051S). It is billable on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
Is S91.051S (Open bite, right ankle) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report open bite, right ankle, sequela on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What does the 7th character S in S91.051S mean?
The final character S makes this a sequela code: it reports a lingering problem that remains after the open bite, right ankle itself has resolved, not the original event.
What MS-DRG does S91.051S group to?
When open bite, right ankle, 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 S91.051S 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, right ankle, sequela on inpatient claims. The code appears in the Injuries to the ankle and foot (S90-S99) range of the CMS exempt list.
