2026 ICD-10-CM Diagnosis Code S91.151AOpen bite of right great toe without damage to nail, initial encounter
S91.151A is a billable ICD-10-CM diagnosis code for open bite of right great toe without damage to nail, initial encounter. The 7th character A marks it as an initial encounter code, used while the patient is receiving active treatment. 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, 963 through 965. Coders also document this condition as animal bite of great toe. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Open wounds to limbs, initial encounter.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Animal bite of great toe
- Dog bite of foot
- Dog bite of great toe
- Dog bite of toe
- Open bite of toe
- Open bite wound of right foot
- Open wound of right foot due to animal bite
- Open wound of right foot due to dog bite
- Open wound of right great toe due to dog bite
- Open wound of toe of right foot due to animal 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.
Read the full article at MedlinePlus
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Convert S91.151A to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About S91.151AOverview
Is S91.151A (Open bite of right great toe without damage to nail) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report open bite of right great toe without damage to nail, initial encounter on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What does the 7th character A in S91.151A mean?
The final character A marks the initial encounter: use it while the patient is receiving active treatment for open bite of right great toe without damage to nail, such as an emergency visit or first evaluation.
What MS-DRG does S91.151A group to?
When open bite of right great toe without damage to nail, initial encounter is the principal diagnosis on an inpatient stay, it groups to MS-DRG 604, 605, 963, 964, 965, with relative weights from 0.9160 to 2.7338 depending on complications. Higher weights mean higher Medicare reimbursement.
What is the ICD-9 equivalent of S91.151A?
Under the General Equivalence Mappings, open bite of right great toe without damage to nail, initial encounter converts to ICD-9-CM 893.0 (open wound of toe). The mapping is approximate, so confirm the match fits the documentation.
Footnotes
[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.
