S20.421A ICD-10-CM Code: Blister (nonthermal) of right back wall of thorax, initial encounter
A clear reference for the official code description, hierarchy, and related coding information from the FY 2027 U.S. release.
Code definition
Official description
S20.421ABlister (nonthermal) of right back wall of thorax, initial encounter
ICD-10-CM diagnosis code · United States clinical modification
Classification
Where S20.421A sits
- 1
Chapter 19
Injury, poisoning and certain other consequences of external causes (S00-T88)
- 2
Section
Injuries to the thorax (S20-S29)
- 3
Category S20
Superficial injury of thorax
- 4
Subcategory S20.421
Blister (nonthermal) of right back wall of thorax
- 5
Code S20.421A
Blister (nonthermal) of right back wall of thorax, initial encounter
Documentation details
Notes for this code
Inclusion terms
No inclusion terms are listed for S20.421A.
Code first
No “code first” instruction is listed for S20.421A.
Use additional code
No “use additional code” instruction is listed for S20.421A.
Excludes1
Conditions that should not be reported together with this code.
No Excludes1 note is listed for S20.421A.
Excludes2
Conditions not included here that may be reported separately when present.
No Excludes2 note is listed for S20.421A.
Transparency
Source and release
This reference is generated from Vero’s ICD-10-CM description, hierarchy, and code-note dataset. The visible content and structured data share that source.
Review the CDC/NCHS ICD-10-CM sourceCode-specific guidance
Frequently asked questions
What does ICD-10-CM code S20.421A mean?
S20.421A is the FY 2027 U.S. ICD-10-CM code for “Blister (nonthermal) of right back wall of thorax, initial encounter.”
Is S20.421A a billable or specific ICD-10-CM code?
Yes. In the FY 2027 reference data used on this page, S20.421A has no child codes and is presented as a billable/specific code. Always confirm the active code set and payer requirements before use.
Where is S20.421A located in ICD-10-CM?
S20.421A is listed in Chapter 19, Injury, poisoning and certain other consequences of external causes (S00-T88), within Injuries to the thorax (S20-S29) (S20–S29), under category S20, Superficial injury of thorax and subcategory S20.421, Blister (nonthermal) of right back wall of thorax.
What coding notes are listed for S20.421A?
No inclusion terms are listed for S20.421A in this reference record. No code-first instruction is listed. No Excludes1 note is listed. No Excludes2 note is listed.
Keep exploring
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