ICD-10-CM 2027 diagnosis code

S01.409Unspecified open wound of unspecified cheek and temporomandibular area

Not billable — use a more specific codeRequires 7th character

S01.409 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.Short description: Unsp open wound of unsp cheek and temporomandibular area

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 S01.409

S01.409 is the ICD-10-CM diagnosis code for unspecified open wound of unspecified cheek and temporomandibular area. It belongs to category S01 (open wound 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 S01.40, choose S01.409 (unspecified cheek and temporomandibular area) only when documentation doesn't support a more specific option: right cheek and temporomandibular area (S01.401) and left cheek and temporomandibular area (S01.402).

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.

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 S01

Ainitial encounterS01.409A
Dsubsequent encounterS01.409D
SsequelaS01.409S

Notes that apply from higher levels

Instructions written at a parent level also apply to S01.409.

› From S01 Open wound of head

Excludes1

open skull fracture (S02.- with 7th character B)

Excludes2

injury of eye and orbit (S05.-)
traumatic amputation of part of head (S08.-)

Code also

any associated:
injury of cranial nerve (S04.-)
injury of muscle and tendon of head (S09.1-)
intracranial injury (S06.-)
wound infection

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

Code history

2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027

FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
No changes since FY2016.

Common questions about S01.409

Is S01.409 billable?: No. S01.409 is a header code. Report one of its more specific subcodes instead.