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ICD-10-CM 2027

ICD-10 code for pharynx corrosion

T28.5

Corrosion of mouth and pharynx

Header — needs a more specific code

From the official ICD-10-CM alphabetic index entry “Corrosion (injury) (acid) (caustic) (chemical) (lime) (external) (internal) › pharynx”. Page updated September 29, 2026.

About coding pharynx corrosion

The ICD-10-CM code for pharynx corrosion is T28.5 (Corrosion of mouth and pharynx).

Within T28 (burn and corrosion of other internal organs), T28.5 is specifically for corrosion of mouth and pharynx. Related codes cover burn of mouth and pharynx (T28.0), burn of esophagus (T28.1), burn of other parts of alimentary tract (T28.2), burn of internal genitourinary organs (T28.3), burns of other and unspecified internal organs (T28.4), corrosion of esophagus (T28.6), corrosion of other parts of alimentary tract (T28.7), corrosion of internal genitourinary organs (T28.8) and 1 more.

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.

Code first: (T51-T65) to identify chemical and intent.

Common questions about pharynx corrosion ICD-10 codes

What is the ICD-10 code for pharynx corrosion?

T28.5 — Corrosion of mouth and pharynx (a header code; report a more specific subcode).

Is T28.5 billable?

No. T28.5 is a header code. Report one of its more specific subcodes instead.