Get started free

T23.421

Non-billable

Corrosion of unspecified degree of single right finger (nail) except thumb

T23.421 is the ICD-10-CM code for Corrosion of unspecified degree of single right finger (nail) except thumb. It is a non-billable category code — use a more specific child code such as T23.421A for billing.

Status
Header (non-billable)
Chapter
S00-T88
Parent
T23.42
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 T23.421?
T23.421 is the ICD-10-CM code for "Corrosion of unspecified degree of single right finger (nail) except thumb". It falls under S00-T88 Injury, poisoning and certain other consequences of external causes.
Is T23.421 a billable code?
No — T23.421 is a non-billable header code. Use a more specific child code (such as T23.421A) for billing.
What are the subcodes of T23.421?
T23.421 has 3 more specific child codes, including T23.421A, T23.421D, T23.421S.

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

Look up another ICD-10 code or condition

Powered by Eleplan

Free ICD-10 lookup is just the start. Eleplan keeps the whole care plan in one place.

Diagnoses, medications, documents, appointments, and the whole care team — organized and always in sync, with Ellie, your AI care assistant, on top of it. Free to start.

Get started freeSee how Eleplan works →