2027 ICD-10-CM Diagnosis Code S84Injury of nerves at lower leg level

ICD-10-CM Codes›S00–T88›S80-S89›S84

ICD-10-CM S84
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

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

ICD-10-CM Code
S84
Billable Status
No — Non-Billable Category
Code Describes
Injury of nerves at lower leg level
Short Description
Injury of nerves at lower leg level
Same as the full description in the CMS dataset.
Chapter
S80-S89
Injuries to the knee and lower leg

Code Classification

ChapterS00–T88Injury, poisoning and certain other consequences of external causes
SectionS80-S89Injuries to the knee and lower leg
CategoryS84Injury of nerves at lower leg level
This CodeS84Injury of nerves at lower leg level

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 2027, published by CMS and the National Center for Health Statistics.

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to S84: its own notes plus those printed at block S80-S89 and Chapter 19. A note printed at a category, block or chapter applies to every code under it.

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

On S84 itself
  • injury of nerves at ankle and foot level (S94.-)
From Block S80-S89 Injuries to the knee and lower leg applies to 4,680 codes
  • burns and corrosions (T20-T32)
  • frostbite (T33-T34)
  • injuries of ankle and foot, except fracture of ankle and malleolus (S90-S99)
  • insect bite or sting, venomous (T63.4)
From Chapter 19 (S00-T88) Injury, poisoning and certain other consequences of external causes applies to 41,187 codes

Use Additional Code

Add a second code, after this one, to fully describe the condition.

From Chapter 19 (S00-T88) Injury, poisoning and certain other consequences of external causes applies to 41,187 codes
  • code to identify any retained foreign body, if applicable (Z18.-)

Code Also

A second code may be needed to fully describe the condition; the note gives no sequencing direction.

  • any associated open wound (S81.-)

Notes

General instructions on how these codes are used.

From Chapter 19 (S00-T88) Injury, poisoning and certain other consequences of external causes applies to 41,187 codes
  • Use secondary code(s) from Chapter 20, External causes of morbidity, to indicate cause of injury. Codes within the T section that include the external cause do not require an additional external cause code
  • The chapter uses the S-section for coding different types of injuries related to single body regions and the T-section to cover injuries to unspecified body regions as well as poisoning and certain other consequences of external causes.

7th Character

Every code in the category takes a 7th character from the listed values, with the placeholder X filling any empty positions before it.

  • The appropriate 7th character is to be added to each code from category S84
Values for category S84 Encounter: Initial, Subsequent, Sequela
  • Ainitial encounter
  • Dsubsequent encounter
  • Ssequela

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name S84, its category, or a range that includes it.

Excludes2 1

These codes carry an Excludes2 note naming S84: its condition is not part of those codes, and both may be reported when the patient has both.

  • S74 Injury of nerves at hip and thigh level
    injury of nerves at lower leg level (S84.-)

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

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About S84Overview

What is the ICD-10 code for injury of nerves at lower leg level?

S84 is the ICD-10-CM category for injury of nerves at lower leg level, but it is a non-billable header: claims need a more specific code from this category, listed on this page.

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.