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S00.521

Non-billable

Blister (nonthermal) of lip

S00.521 is the ICD-10-CM code for Blister (nonthermal) of lip. It is a non-billable category code — use a more specific child code such as S00.521A for billing.

Status
Header (non-billable)
Chapter
S00-T88
Parent
S00.52
Subcodes
3
Edition
FY2026

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

What this means — in plain language

MedlinePlus · NIH

What are blisters? Blisters are fluid-filled sacs on the outer layer of your skin. They form because of rubbing, heat, or diseases of the skin. They are most common on your hands and feet. Other names for blisters are vesicles (usually for smaller blisters) and bulla (for larger blisters). What causes blisters? Blisters often happen when there is friction - rubbing or pressure - on one spot. For example, if your…

Read more about Blisters at MedlinePlus ↗

Source: U.S. National Library of Medicine (MedlinePlus). Informational only — not medical advice.

No additional coding notes for this code.

Frequently asked questions

What is ICD-10 code S00.521?
S00.521 is the ICD-10-CM code for "Blister (nonthermal) of lip". It falls under S00-T88 Injury, poisoning and certain other consequences of external causes.
Is S00.521 a billable code?
No — S00.521 is a non-billable header code. Use a more specific child code (such as S00.521A) for billing.
What are the subcodes of S00.521?
S00.521 has 3 more specific child codes, including S00.521A, S00.521D, S00.521S.

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

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