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S23.421

Non-billable

Sprain of chondrosternal joint

S23.421 is the ICD-10-CM code for Sprain of chondrosternal joint. It is a non-billable category code — use a more specific child code such as S23.421A for billing.

Status
Header (non-billable)
Chapter
S00-T88
Parent
S23.42
Subcodes
3
Edition
FY2026

S00-T88 Injury, poisoning and certain other consequences of external causes

No additional coding notes for this code.

Frequently asked questions

What is ICD-10 code S23.421?
S23.421 is the ICD-10-CM code for "Sprain of chondrosternal joint". It falls under S00-T88 Injury, poisoning and certain other consequences of external causes.
Is S23.421 a billable code?
No — S23.421 is a non-billable header code. Use a more specific child code (such as S23.421A) for billing.
What are the subcodes of S23.421?
S23.421 has 3 more specific child codes, including S23.421A, S23.421D, S23.421S.

Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.

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