T21.42 Corrosion of unspecified degree of abdominal wall

Non-billable ICD-10-CM code.

Applicable to

• Corrosion of unspecified degree of flank
• Corrosion of unspecified degree of groin

Applies from T21 Burn and corrosion of trunk

Includes

• burns and corrosion of hip region

Excludes2 (not included here)

• burns and corrosion of axilla (T22.- with fifth character 4)
• burns and corrosion of scapular region (T22.- with fifth character 6)
• burns and corrosion of shoulder (T22.- with fifth character 5)

7th character note

• The appropriate 7th character is to be added to each code from category T21

7th character required

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

Applies from T21.4 Corrosion of unspecified degree of trunk

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 T21.42

Back-references to T21

• Type 2 Excludes: T22 Burn and corrosion of shoulder and upper limb, except wrist and hand ("burn and corrosion of interscapular region (T21.-)")
• Type 2 Excludes: T24 Burn and corrosion of lower limb, except ankle and foot ("burn and corrosion of hip region (T21.-)")
• 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 T21.42

• Corrosion (injury) (acid) (caustic) (chemical) (lime) (external) (internal) › abdomen, abdominal (muscle) (wall)

Nearby codes

• T21.40XS Corrosion of unspecified degree of trunk, unspecified site, sequela
• T21.41 Corrosion of unspecified degree of chest wall
• T21.41XA Corrosion of unspecified degree of chest wall, initial encounter
• T21.41XD Corrosion of unspecified degree of chest wall, subsequent encounter
• T21.41XS Corrosion of unspecified degree of chest wall, sequela
• T21.42 Corrosion of unspecified degree of abdominal wall (this code)
• T21.42XA Corrosion of unspecified degree of abdominal wall, initial encounter
• T21.42XD Corrosion of unspecified degree of abdominal wall, subsequent encounter
• T21.42XS Corrosion of unspecified degree of abdominal wall, sequela
• T21.43 Corrosion of unspecified degree of upper back
• T21.43XA Corrosion of unspecified degree of upper back, initial encounter