T20.412A Corrosion of unspecified degree of left ear [any part, except ear drum], initial encounter

Billable ICD-10-CM code, FY2026.

Built from T20.412 with 7th character A (initial encounter).

Applies from T20 Burn and corrosion of head, face, and neck

Excludes2 (not included here)

• burn and corrosion of ear drum (T28.41, T28.91)
• burn and corrosion of eye and adnexa (T26.-)
• burn and corrosion of mouth and pharynx (T28.0)

7th character note

• The appropriate 7th character is to be added to each code from category T20

7th character required

• A — initial encounter
• D — subsequent encounter
• S — sequela

Applies from T20.4 Corrosion of unspecified degree of head, face, and neck

Code first

• (T51-T65) to identify chemical and intent

Use additional code

• external cause code to identify place (Y92)

Applies from T20.41 Corrosion of unspecified degree of ear [any part, except ear drum]

Excludes2 (not included here)

• corrosion of ear drum (T28.91-)

Code annotations containing back-references to T20.412A

Back-references to T20

• Type 1 Excludes: T66 Radiation sickness, unspecified ("burns (T20-T31)")
• Type 2 Excludes: T67 Effects of heat and light ("burns (T20-T31)")
• Type 2 Excludes: T75 Other and unspecified effects of other external causes ("burns (electric) (T20-T31)")

Nearby codes

• T20.411 Corrosion of unspecified degree of right ear [any part, except ear drum]
• T20.411A Corrosion of unspecified degree of right ear [any part, except ear drum], initial encounter
• T20.411D Corrosion of unspecified degree of right ear [any part, except ear drum], subsequent encounter
• T20.411S Corrosion of unspecified degree of right ear [any part, except ear drum], sequela
• T20.412 Corrosion of unspecified degree of left ear [any part, except ear drum]
• T20.412A Corrosion of unspecified degree of left ear [any part, except ear drum], initial encounter (this code)
• T20.412D Corrosion of unspecified degree of left ear [any part, except ear drum], subsequent encounter
• T20.412S Corrosion of unspecified degree of left ear [any part, except ear drum], sequela
• T20.419 Corrosion of unspecified degree of unspecified ear [any part, except ear drum]
• T20.419A Corrosion of unspecified degree of unspecified ear [any part, except ear drum], initial encounter
• T20.419D Corrosion of unspecified degree of unspecified ear [any part, except ear drum], subsequent encounter