T20.40 Corrosion of unspecified degree of head, face, and neck, unspecified site

Non-billable ICD-10-CM code.

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)

Code annotations containing back-references to T20.40

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)")

Diagnosis Index entries for T20.40

• Corrosion (injury) (acid) (caustic) (chemical) (lime) (external) (internal) › head (and face) (and neck)

Nearby codes

• T20.39 Burn of third degree of multiple sites of head, face, and neck
• T20.39XA Burn of third degree of multiple sites of head, face, and neck, initial encounter
• T20.39XD Burn of third degree of multiple sites of head, face, and neck, subsequent encounter
• T20.39XS Burn of third degree of multiple sites of head, face, and neck, sequela
• T20.4 Corrosion of unspecified degree of head, face, and neck
• T20.40 Corrosion of unspecified degree of head, face, and neck, unspecified site (this code)
• T20.40XA Corrosion of unspecified degree of head, face, and neck, unspecified site, initial encounter
• T20.40XD Corrosion of unspecified degree of head, face, and neck, unspecified site, subsequent encounter
• T20.40XS Corrosion of unspecified degree of head, face, and neck, unspecified site, sequela
• T20.41 Corrosion of unspecified degree of ear [any part, except ear drum]
• T20.411 Corrosion of unspecified degree of right ear [any part, except ear drum]