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ICD-10-CM 2027 diagnosis code

S04.81Injury of olfactory [1st ] nerve

Not billable — use a more specific codeRequires 7th character

S04.81 is a header code, so it can't be reported by itself. Choose one of the 3 more specific codes beneath it and add the required 7th character.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About S04.81

S04.81 is the ICD-10-CM diagnosis code for injury of olfactory [1st ] nerve. It belongs to category S04 (injury of cranial nerve), block S00-S09 (injuries to the head) and chapter 19 (injury, poisoning and certain other consequences of external causes). It is a header code, so it can't be reported by itself; one of its 3 subcodes must be used instead.

Within S04.8 (injury of other cranial nerves), S04.81 is specifically for injury of olfactory [1st ] nerve. Related codes cover other cranial nerves (S04.89).

Codes in this range require a 7th character: A for initial encounter, D for subsequent encounter and S for sequela. Use placeholder "X" characters to fill any empty positions before the 7th character.

Code first: any associated intracranial injury (S06.-).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

7th character

The appropriate 7th character is to be added to each code from category S04

  • Ainitial encounter
  • Dsubsequent encounter
  • Ssequela

Notes that apply from higher levels

Instructions written at a parent level also apply to S04.81.

› From S04 Injury of cranial nerve
Code first
  • any associated intracranial injury (S06.-)
Code also
  • any associated:
  • open wound of head (S01.-)
  • skull fracture (S02.-)

Broader instructions also apply from S00-S09 Injuries to the head and Chapter 19: Injury, poisoning and certain other consequences of external causes.

Alphabetic index entries

2 entries

Terms in the official ICD-10-CM index that lead to S04.81.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about S04.81

Is S04.81 billable?

No. S04.81 is a header code. Report one of its more specific subcodes instead.