2026 ICD-10-CM Diagnosis Code S84Injury of nerves at lower leg level
S84 is a non-billable ICD-10-CM category code for injury of nerves at lower leg level, so it cannot be submitted on claims. Use a more specific code from this category instead, such as S84.00XA, S84.00XD, S84.00XS, and S84.01XA.
Code Identity
Code Classification
Specific Coding for Injury of nerves at lower leg levelOverview
Non-specific codes like S84 require more characters. Use one of these billable codes instead:
S84.0 for Injury of tibial nerve at lower leg level
S84.00 for Injury of tibial nerve at lower leg level, unspecified leg
S84.01 for Injury of tibial nerve at lower leg level, right leg
S84.02 for Injury of tibial nerve at lower leg level, left leg
S84.1 for Injury of peroneal nerve at lower leg level
S84.10 for Injury of peroneal nerve at lower leg level, unspecified leg
S84.11 for Injury of peroneal nerve at lower leg level, right leg
S84.12 for Injury of peroneal nerve at lower leg level, left leg
S84.2 for Injury of cutaneous sensory nerve at lower leg level
S84.20 for Injury of cutaneous sensory nerve at lower leg level, unspecified leg
S84.21 for Injury of cutaneous sensory nerve at lower leg level, right leg
S84.22 for Injury of cutaneous sensory nerve at lower leg level, left leg
S84.8 for Injury of other nerves at lower leg level
S84.80 for Injury of other nerves at lower leg level
S84.9 for Injury of unspecified nerve at lower leg level
S84.90 for Injury of unspecified nerve at lower leg level, unspecified leg
S84.91 for Injury of unspecified nerve at lower leg level, right leg
S84.92 for Injury of unspecified nerve at lower leg level, left leg
Coding GuidelinesGuidance
The appropriate 7th character is to be added to each code from block Injury of nerves at lower leg level (S84). 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.
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Code Also
- any associated open wound S81
Type 2 Excludes
- injury of nerves at ankle and foot level S94
7th Character Note
- The appropriate 7th character is to be added to each code from category S84
7th Character
- A - initial encounter
- D - subsequent encounter
- S - sequela
A "code also" note instructs that two codes may be required to fully describe a condition, but this note does not provide sequencing direction.
A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.
Certain ICD-10-CM categories have applicable 7th characters. The applicable 7th character is required for all codes within the category, or as the notes in the Tabular List instruct. The 7th character must always be the 7th character in the data field. If a code that requires a 7th character is not 6 characters, a placeholder X must be used to fill in the empty characters.
Indicates that a seventh character is to be assigned to codes in a subcategory.
Patient EducationClinical
Leg Injuries and Disorders
Your legs are made up of bones, blood vessels, muscles, and other connective tissue. They are important for motion and standing. Playing sports, running, falling, or having an accident can damage your legs. Common leg injuries include sprains and strains, joint dislocations, and fractures (broken bones).
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Code HistoryHistory
Questions About S84Overview
Is S84 (Injury of nerves at lower leg level) a billable code?
No. This is a category header that groups the codes for injury of nerves at lower leg level, and headers cannot be submitted on claims. Claims for injury of nerves at lower leg level need a more specific code from this category, such as S84.00XA, S84.00XD, and S84.00XS.
