Skip to content
Dx

ICD-10-CM 2027 diagnosis code

S09.1Injury of muscle and tendon of head

Not billable — use a more specific codeRequires 7th character

S09.1 is a header code, so it can't be reported by itself. Choose one of the 4 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 S09.1

S09.1 is the ICD-10-CM diagnosis code for injury of muscle and tendon 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 4 subcodes must be used instead.

Within S09 (other and unspecified injuries of head), S09.1 is specifically for injury of muscle and tendon of head. Related codes cover injury of blood vessels of head, not elsewhere classified (S09.0), traumatic rupture of ear drum (S09.2), other specified and unspecified injury of middle and inner ear (S09.3), other specified injuries of head (S09.8) and unspecified injury of face and head (S09.9).

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.

The conditions in its Excludes2 note aren't part of S09.1, but may be coded alongside it if the patient has both: sprain to joints and ligament of head (S03.9).

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

  • Ainitial encounter
  • Dsubsequent encounter
  • Ssequela

Coding notes

Excludes2Not included here — may be reported together if both conditions exist
  • sprain to joints and ligament of head (S03.9)
Code alsoTwo codes may be needed; sequencing depends on circumstances
  • any associated open wound (S01.-)

Notes that apply from higher levels

Instructions written at a parent level also apply to S09.1.

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

Codes whose notes reference S09.1

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 S09.1

Is S09.1 billable?

No. S09.1 is a header code. Report one of its more specific subcodes instead.