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ICD-10-CM 2027

ICD-10 code for lip blister

S00.521

Blister (nonthermal) of lip

Header — needs a more specific code

From the official ICD-10-CM alphabetic index entry “Blister (nonthermal) › lip”. Page updated September 29, 2026.

About coding lip blister

The ICD-10-CM code for lip blister is S00.521 (Blister (nonthermal) of lip).

Within S00.52 (Blister (nonthermal) of lip and oral cavity), S00.521 is specifically for Blister (nonthermal) of lip. Related codes cover oral cavity (S00.522).

Codes in this range require a 7th character: A for initial encounter, D for subsequent encounter and S for sequela. Use placeholder "X" characters to fill any empty positions before the 7th character.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Common questions about lip blister ICD-10 codes

What is the ICD-10 code for lip blister?

S00.521 — Blister (nonthermal) of lip (a header code; report a more specific subcode).

Is S00.521 billable?

No. S00.521 is a header code. Report one of its more specific subcodes instead.