ICD-10-CM 2027 diagnosis code
S20.324Blister (nonthermal) of middle front wall of thorax
S20.324 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 last changed in FY2021 (effective October 1, 2020). Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data
About S20.324
S20.324 is the ICD-10-CM diagnosis code for Blister (nonthermal) of middle front wall of thorax. It belongs to category S20 (superficial injury of thorax), block S20-S29 (injuries to the thorax) 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 S20.32 (Blister (nonthermal) of front wall of thorax), S20.324 is specifically for Blister (nonthermal) of middle front wall of thorax. Related codes cover right front wall of thorax (S20.321), left front wall of thorax (S20.322), bilateral front wall of thorax (S20.323) and unspecified front wall of thorax (S20.329).
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 was added in FY2021, effective October 1, 2020.
7th character
The appropriate 7th character is to be added to each code from category S20
Notes that apply from higher levels
Instructions written at a parent level also apply to S20.324.
Broader instructions also apply from S20-S29 Injuries to the thorax 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
- FY2021 (effective 10/1/2020): Added
- No changes since FY2021.
Common questions about S20.324
Is S20.324 billable?
- No. S20.324 is a header code. Report one of its more specific subcodes instead.