T24.42 Corrosion of unspecified degree of knee

Non-billable header with 3 child codes.

Applies from T24 Burn and corrosion of lower limb, except ankle and foot

Excludes2 (not included here)

• burn and corrosion of ankle and foot (T25.-)
• burn and corrosion of hip region (T21.-)

7th character note

• The appropriate 7th character is to be added to each code from category T24

7th character required

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

Applies from T24.4 Corrosion of unspecified degree of lower limb, except ankle and foot

Code first

• (T51-T65) to identify chemical and intent

Use additional code

• external cause code to identify place (Y92)

Codes under T24.42

• T24.421 Corrosion of unspecified degree of right knee
• T24.422 Corrosion of unspecified degree of left knee
• T24.429 Corrosion of unspecified degree of unspecified knee

Code annotations containing back-references to T24.42

Back-references to T24

• 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

• T24.412S Corrosion of unspecified degree of left thigh, sequela
• T24.419 Corrosion of unspecified degree of unspecified thigh
• T24.419A Corrosion of unspecified degree of unspecified thigh, initial encounter
• T24.419D Corrosion of unspecified degree of unspecified thigh, subsequent encounter
• T24.419S Corrosion of unspecified degree of unspecified thigh, sequela
• T24.42 Corrosion of unspecified degree of knee (this code)
• T24.421 Corrosion of unspecified degree of right knee
• T24.421A Corrosion of unspecified degree of right knee, initial encounter
• T24.421D Corrosion of unspecified degree of right knee, subsequent encounter
• T24.421S Corrosion of unspecified degree of right knee, sequela
• T24.422 Corrosion of unspecified degree of left knee