DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

S84 Injury of nerves at lower leg level

  • Header · not billable
  • Codes take a 7th character

S84 is not billable. The category heads 45 billable codes in FY2027, grouped under 5 subdivisions. Its codes take a 7th character, so none is complete with fewer than 7 characters.

Index → code

  • Injurynerve NECleg (lower) → S84.9-
  • Injurynerve NECperoneal (lower leg level) → S84.1-
  • Injurynerve NECtibial (lower leg level) (posterior) → S84.0-

Where it sits

  1. Chapter 19 Injury, poisoning and certain other consequences of external causes (S00-T88)
  2. S80-S89 Injuries to the knee and lower leg (S80-S89)
  3. S84 Injury of nerves at lower leg level
Billable codes
45
Subdivisions
5
CC / MCC codes
0 / 0
HCC V28 codes
0
New FY2027
0
Index entries
5

Codes in S84

  1. S84.0
    Injury of tibial nerve at lower leg level
    Header
  2. S84.00
    Injury of tibial nerve at lower leg level, unspecified leg +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  3. S84.01
    Injury of tibial nerve at lower leg level, right leg +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  4. S84.02
    Injury of tibial nerve at lower leg level, left leg +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  5. S84.1
    Injury of peroneal nerve at lower leg level
    Header
  6. S84.10
    Injury of peroneal nerve at lower leg level, unspecified leg +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  7. S84.11
    Injury of peroneal nerve at lower leg level, right leg +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  8. S84.12
    Injury of peroneal nerve at lower leg level, left leg +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  9. S84.2
    Injury of cutaneous sensory nerve at lower leg level
    Header
  10. S84.20
    Injury of cutaneous sensory nerve at lower leg level, unspecified leg +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  11. S84.21
    Injury of cutaneous sensory nerve at lower leg level, right leg +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  12. S84.22
    Injury of cutaneous sensory nerve at lower leg level, left leg +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  13. S84.8
    Injury of other nerves at lower leg level
    Header
  14. S84.80
    Injury of other nerves at lower leg level
    Header
  15. S84.801
    Injury of other nerves at lower leg level, right leg +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  16. S84.802
    Injury of other nerves at lower leg level, left leg +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  17. S84.809
    Injury of other nerves at lower leg level, unspecified leg +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  18. S84.9
    Injury of unspecified nerve at lower leg level
    Header
  19. S84.90
    Injury of unspecified nerve at lower leg level, unspecified leg +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  20. S84.91
    Injury of unspecified nerve at lower leg level, right leg +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  21. S84.92
    Injury of unspecified nerve at lower leg level, left leg +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters

Sources of each column. Rows marked +7th need a 7th character: pick one to build the full code; its code card has its own flags.

Instructions

At S84

Excludes2

  • injury of nerves at ankle and foot level (S94.-) S94

Code also

  • any associated open wound (S81.-) S81

Notes that also apply

Block S80-S89 instructions (Excludes2 4): printed on the block page.

Chapter 19 instructions (Notes 2, Excludes2 2, Use additional code 1): printed on the chapter 19 page.

7th characters

7th characters for S84 defined here

The appropriate 7th character is to be added to each code from category S84

7th characters for S84
7thMeaning (NCHS)
Ainitial encounter
Dsubsequent encounter
Ssequela

A code that takes a 7th character is invalid without it; the placeholder X fills a code shorter than 6 characters (Official Guidelines I.A.5). How 7th characters work.

Index entries

  • Injurynerve NECtibial (lower leg level) (posterior) → S84.0-
  • Injurynerve NECperoneal (lower leg level) → S84.1-
  • Injurynerve NECleg (lower) → S84.9-
  • Injurynerve NECcutaneous sensoryleg (lower level) → S84.2-
  • Injurynerve NECleg (lower)specified site NEC → S84.8

NCHS Alphabetic Index. Index first, then the Tabular List.

Hierarchy