Injury of nerves at lower leg level (S84) ICD-10-CM
The S84 code range covers injury of nerves at lower leg level with 67 ICD-10-CM diagnosis codes. 45 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.
Code Also
A "code also" note instructs that two codes may be required to fully describe a condition, but this note does not provide sequencing direction.
- any associated open wound S81
Type 2 Excludes
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.
- injury of nerves at ankle and foot level S94
7th Character Note
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.
- The appropriate 7th character is to be added to each code from category S84
7th Character
Indicates that a seventh character is to be assigned to codes in a subcategory.
- A - initial encounter
- D - subsequent encounter
- S - sequela
Codes in the S84 Range 67 codes · 45 billable
- S84 Injury of nerves at lower leg levelNon-billable
- S84.0 Injury of tibial nerve at lower leg levelNon-billable
- S84.00 Injury of tibial nerve at lower leg level, unspecified legNon-billable
- S84.00XA Injury of tibial nerve at lower leg level, unspecified leg, initial encounter
- S84.00XD Injury of tibial nerve at lower leg level, unspecified leg, subsequent encounter
- S84.00XS Injury of tibial nerve at lower leg level, unspecified leg, sequela
- S84.01 Injury of tibial nerve at lower leg level, right legNon-billable
- S84.01XA Injury of tibial nerve at lower leg level, right leg, initial encounter
- S84.01XD Injury of tibial nerve at lower leg level, right leg, subsequent encounter
- S84.01XS Injury of tibial nerve at lower leg level, right leg, sequela
- S84.02 Injury of tibial nerve at lower leg level, left legNon-billable
- S84.02XA Injury of tibial nerve at lower leg level, left leg, initial encounter
- S84.02XD Injury of tibial nerve at lower leg level, left leg, subsequent encounter
- S84.02XS Injury of tibial nerve at lower leg level, left leg, sequela
- S84.1 Injury of peroneal nerve at lower leg levelNon-billable
- S84.10 Injury of peroneal nerve at lower leg level, unspecified legNon-billable
- S84.10XA Injury of peroneal nerve at lower leg level, unspecified leg, initial encounter
- S84.10XD Injury of peroneal nerve at lower leg level, unspecified leg, subsequent encounter
- S84.10XS Injury of peroneal nerve at lower leg level, unspecified leg, sequela
- S84.11 Injury of peroneal nerve at lower leg level, right legNon-billable
- S84.11XA Injury of peroneal nerve at lower leg level, right leg, initial encounter
- S84.11XD Injury of peroneal nerve at lower leg level, right leg, subsequent encounter
- S84.11XS Injury of peroneal nerve at lower leg level, right leg, sequela
- S84.12 Injury of peroneal nerve at lower leg level, left legNon-billable
- S84.12XA Injury of peroneal nerve at lower leg level, left leg, initial encounter
- S84.12XD Injury of peroneal nerve at lower leg level, left leg, subsequent encounter
- S84.12XS Injury of peroneal nerve at lower leg level, left leg, sequela
- S84.2 Injury of cutaneous sensory nerve at lower leg levelNon-billable
- S84.20 Injury of cutaneous sensory nerve at lower leg level, unspecified legNon-billable
- S84.20XA Injury of cutaneous sensory nerve at lower leg level, unspecified leg, initial encounter
- S84.20XD Injury of cutaneous sensory nerve at lower leg level, unspecified leg, subsequent encounter
- S84.20XS Injury of cutaneous sensory nerve at lower leg level, unspecified leg, sequela
- S84.21 Injury of cutaneous sensory nerve at lower leg level, right legNon-billable
- S84.21XA Injury of cutaneous sensory nerve at lower leg level, right leg, initial encounter
- S84.21XD Injury of cutaneous sensory nerve at lower leg level, right leg, subsequent encounter
- S84.21XS Injury of cutaneous sensory nerve at lower leg level, right leg, sequela
- S84.22 Injury of cutaneous sensory nerve at lower leg level, left legNon-billable
- S84.22XA Injury of cutaneous sensory nerve at lower leg level, left leg, initial encounter
- S84.22XD Injury of cutaneous sensory nerve at lower leg level, left leg, subsequent encounter
- S84.22XS Injury of cutaneous sensory nerve at lower leg level, left leg, sequela
- S84.8 Injury of other nerves at lower leg levelNon-billable
- S84.80 Injury of other nerves at lower leg levelNon-billable
- S84.801 Injury of other nerves at lower leg level, right legNon-billable
- S84.801A Injury of other nerves at lower leg level, right leg, initial encounter
- S84.801D Injury of other nerves at lower leg level, right leg, subsequent encounter
- S84.801S Injury of other nerves at lower leg level, right leg, sequela
- S84.802 Injury of other nerves at lower leg level, left legNon-billable
- S84.802A Injury of other nerves at lower leg level, left leg, initial encounter
- S84.802D Injury of other nerves at lower leg level, left leg, subsequent encounter
- S84.802S Injury of other nerves at lower leg level, left leg, sequela
- S84.809 Injury of other nerves at lower leg level, unspecified legNon-billable
- S84.809A Injury of other nerves at lower leg level, unspecified leg, initial encounter
- S84.809D Injury of other nerves at lower leg level, unspecified leg, subsequent encounter
- S84.809S Injury of other nerves at lower leg level, unspecified leg, sequela
- S84.9 Injury of unspecified nerve at lower leg levelNon-billable
- S84.90 Injury of unspecified nerve at lower leg level, unspecified legNon-billable
- S84.90XA Injury of unspecified nerve at lower leg level, unspecified leg, initial encounter
- S84.90XD Injury of unspecified nerve at lower leg level, unspecified leg, subsequent encounter
- S84.90XS Injury of unspecified nerve at lower leg level, unspecified leg, sequela
- S84.91 Injury of unspecified nerve at lower leg level, right legNon-billable
- S84.91XA Injury of unspecified nerve at lower leg level, right leg, initial encounter
- S84.91XD Injury of unspecified nerve at lower leg level, right leg, subsequent encounter
- S84.91XS Injury of unspecified nerve at lower leg level, right leg, sequela
- S84.92 Injury of unspecified nerve at lower leg level, left legNon-billable
- S84.92XA Injury of unspecified nerve at lower leg level, left leg, initial encounter
- S84.92XD Injury of unspecified nerve at lower leg level, left leg, subsequent encounter
- S84.92XS Injury of unspecified nerve at lower leg level, left leg, sequela
About the S84 Code Range
The ICD-10 code section S84 covers injuries to nerves located at the lower leg level. These codes specify nerve damage to different nerves such as the tibial nerve, peroneal nerve, cutaneous sensory nerves, other specified nerves, or unspecified nerves, with details on leg side and encounter type.
Injuries to the tibial nerve are coded under S84.0 (including right S84.01 and left leg S84.02), which also cover synonyms like "posterior tibial nerve injury" and "right/left tibial neuropathy". The peroneal nerve injuries (S84.1 series) include conditions such as "superficial peroneal neuropathy," "deep peroneal nerve lesion," or "peroneal nerve injury." Codes for the cutaneous sensory nerve injuries are under S84.2. Injuries to other or unspecified nerves at the lower leg level are detailed in S84.8 and S84.9 series, addressing cases like traumatic neuroma or broad nerve injuries without specification. Each injury code supports specifications like initial encounter, subsequent encounters, and sequela (late effects). This detailed breakdown assists in precise clinical documentation and accurate medical coding for lower leg nerve injuries.
Questions About This Page
How many billable codes are in the S84 range?
Of the 67 codes in this range, 45 are billable and valid for claim submission from October 1, 2025 through September 30, 2026. Category header codes group them but cannot be reported on claims.
What does the S84 range classify?
The range classifies injury of nerves at lower leg level. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
