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ICD-10-CM 2027 diagnosis code

S09.90Unspecified injury of head

Not billable — use a more specific codeRequires 7th character

S09.90 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.

Looking up by condition? See ICD-10 code for Head injury, ICD-10 code for Scalp injury.

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 S09.90

S09.90 is the ICD-10-CM diagnosis code for unspecified injury of head. It belongs to category S09 (other and unspecified injuries of head), 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 S09.9 (unspecified injury of face and head), S09.90 is specifically for unspecified injury of head. Related codes cover ear (S09.91), nose (S09.92) and face (S09.93).

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.

Don't report S09.90 together with the conditions in its Excludes1 note: brain injury NOS (S06.9-), head injury NOS with loss of consciousness (S06.9-) and intracranial injury NOS (S06.9-).

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 S09

Coding notes

Applicable toConditions and synonyms classified to this code
  • Head injury NOS
Excludes1Not coded here — never report together with this code
  • brain injury NOS (S06.9-)
  • head injury NOS with loss of consciousness (S06.9-)
  • intracranial injury NOS (S06.9-)

Notes that apply from higher levels

Instructions written at a parent level also apply to S09.90.

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

11 entries

Terms in the official ICD-10-CM index that lead to S09.90.

Codes whose notes reference S09.90

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 S09.90

Is S09.90 billable?

No. S09.90 is a header code. Report one of its more specific subcodes instead.