T21.64 Corrosion of second degree of lower back

Non-billable ICD-10-CM code.

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 T21.6 Corrosion of second 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 T21.64

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 T21.64

• Corrosion (injury) (acid) (caustic) (chemical) (lime) (external) (internal) › back (lower) › second degree

Nearby codes

• T21.62XS Corrosion of second degree of abdominal wall, sequela
• T21.63 Corrosion of second degree of upper back
• T21.63XA Corrosion of second degree of upper back, initial encounter
• T21.63XD Corrosion of second degree of upper back, subsequent encounter
• T21.63XS Corrosion of second degree of upper back, sequela
• T21.64 Corrosion of second degree of lower back (this code)
• T21.64XA Corrosion of second degree of lower back, initial encounter
• T21.64XD Corrosion of second degree of lower back, subsequent encounter
• T21.64XS Corrosion of second degree of lower back, sequela
• T21.65 Corrosion of second degree of buttock
• T21.65XA Corrosion of second degree of buttock, initial encounter