ICD-10-CM 2027 diagnosis code
S01.409SUnspecified open wound of unspecified cheek and temporomandibular area, sequela
S01.409S is a valid, billable ICD-10-CM code for unspecified open wound of unspecified cheek and temporomandibular area, sequela. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.Short description: Unsp open wound of unsp cheek and TMJ area, sequela
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 S01.409S
S01.409S is the ICD-10-CM diagnosis code for unspecified open wound of unspecified cheek and temporomandibular area, sequela. 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 billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.
The 7th character "S" means sequela: use it for complications or conditions that arise as a direct result of the original condition.
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 604 (Trauma to the Skin, Subcutaneous Tissue and Breast with MCC, relative weight 1.453) and DRG 605 (Trauma to the Skin, Subcutaneous Tissue and Breast without MCC, relative weight 0.9079), in MDC 09 (Diseases and Disorders of the Skin, Subcutaneous Tissue and Breast), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
It is exempt from present-on-admission (POA) reporting, so no POA indicator is required.
It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.
Before ICD-10, this condition was coded in ICD-9-CM as 906.0 (late effect of open wound of head, neck, and trunk).
7th character
Ssequela
Other encounter types for S01.409:
Notes that apply from higher levels
Instructions written at a parent level also apply to S01.409S.
› From S01 Open wound of head
Broader instructions also apply from S00-S09 Injuries to the head and Chapter 19: Injury, poisoning and certain other consequences of external causes.
MS-DRG v44.0 grouping
All DRGs →Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.
MDC 09 · Diseases and Disorders of the Skin, Subcutaneous Tissue and Breast
ICD-9-CM equivalent
Converter →- 906.0Late effect of open wound of head, neck, and trunkapproximate
From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.
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 S01.409S
Is S01.409S billable?
- Yes. S01.409S is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
What does the "S" at the end of S01.409S mean?
- It is the 7th character for sequela. Per the official guidelines, use it for complications or conditions that arise as a direct result of the original condition.
Can S01.409S be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict S01.409S as a principal diagnosis.
Is S01.409S a CC or MCC?
- No. S01.409S is neither a CC nor an MCC under MS-DRG v44.0.
What DRG does S01.409S group to?
- S01.409S is used in the MS-DRG v44.0 logic for MS-DRG 604 (Trauma to the Skin, Subcutaneous Tissue and Breast with MCC) and MS-DRG 605 (Trauma to the Skin, Subcutaneous Tissue and Breast without MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.
What is the ICD-9 code for S01.409S?
- The CMS General Equivalence Mappings map S01.409S to ICD-9-CM 906.0.