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ICD-10-CM 2027

ICD-10 code for ear blister

S00.42

Blister (nonthermal) of ear

Header — needs a more specific code

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

About coding ear blister

The ICD-10-CM code for ear blister is S00.42 (Blister (nonthermal) of ear).

Within S00.4 (superficial injury of ear), S00.42 is specifically for Blister (nonthermal) of ear. Related codes cover unspecified superficial injury of ear (S00.40), abrasion of ear (S00.41), contusion of ear (S00.43), external constriction of ear (S00.44), superficial foreign body of ear (S00.45), insect bite (nonvenomous) of ear (S00.46) and other superficial bite of ear (S00.47).

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 ear blister ICD-10 codes

What is the ICD-10 code for ear blister?

S00.42 — Blister (nonthermal) of ear (a header code; report a more specific subcode).

Is S00.42 billable?

No. S00.42 is a header code. Report one of its more specific subcodes instead.