Is S20.421 a billable code?
No. S20.421 is a header code that groups 3 more specific codes. Use one of the billable codes listed on this page instead.
ICD-10-CM FY2027 diagnosis code
S20.421: Blister (nonthermal) of right back wall of thorax
Header code: not billableValid for dates of service October 1, 2026 to September 30, 2027
S20.421 groups related diagnoses under blister (nonthermal) of right back wall of thorax. It cannot be used on a claim by itself. Choose the billable code below that matches the patient's record.
Billable codes under S20.421
- S20.421ABlister (nonthermal) of right back wall of thorax, initial encounter
- S20.421DBlister (nonthermal) of right back wall of thorax, subsequent encounter
- S20.421SBlister (nonthermal) of right back wall of thorax, sequela
Other codes in S20.42 Blister (nonthermal) of back wall of thorax
S20.421 questions
What does S20.421 mean?
S20.421 is the ICD-10-CM code for Blister (nonthermal) of right back wall of thorax. It is in chapter 19, Injury, poisoning and certain other consequences of external causes (S00-T88).
Code titles come from the official ICD-10-CM files published by the CDC National Center for Health Statistics. Always check payer rules and the clinical record before billing.