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S56.399

Non-billable

Other injury of extensor or abductor muscles, fascia and tendons of unspecified thumb at forearm level

S56.399 is the ICD-10-CM code for Other injury of extensor or abductor muscles, fascia and tendons of unspecified thumb at forearm level. It is a non-billable category code — use a more specific child code such as S56.399A for billing.

Status
Header (non-billable)
Chapter
S00-T88
Parent
S56.39
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 S56.399?
S56.399 is the ICD-10-CM code for "Other injury of extensor or abductor muscles, fascia and tendons of unspecified thumb at forearm level". It falls under S00-T88 Injury, poisoning and certain other consequences of external causes.
Is S56.399 a billable code?
No — S56.399 is a non-billable header code. Use a more specific child code (such as S56.399A) for billing.
What are the subcodes of S56.399?
S56.399 has 3 more specific child codes, including S56.399A, S56.399D, S56.399S.

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

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