T22.549A Corrosion of first degree of unspecified axilla, initial encounter

Billable ICD-10-CM code, FY2026.

Built from T22.549 with 7th character A (initial encounter).

Applies from T22 Burn and corrosion of shoulder and upper limb, except wrist and hand

Excludes2 (not included here)

• burn and corrosion of interscapular region (T21.-)
• burn and corrosion of wrist and hand (T23.-)

7th character note

• The appropriate 7th character is to be added to each code from category T22

7th character required

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

Applies from T22.5 Corrosion of first degree of shoulder and upper limb, except wrist and hand

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 T22.549A

Back-references to T22

• Type 2 Excludes: T21 Burn and corrosion of trunk ("burns and corrosion of axilla (T22.- with fifth character 4)")
• Type 2 Excludes: T21 Burn and corrosion of trunk ("burns and corrosion of scapular region (T22.- with fifth character 6)")
• Type 2 Excludes: T21 Burn and corrosion of trunk ("burns and corrosion of shoulder (T22.- with fifth character 5)")
• 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 T22.549A

• Corrosion (injury) (acid) (caustic) (chemical) (lime) (external) (internal) › axilla › first degree

Nearby codes

• T22.542 Corrosion of first degree of left axilla
• T22.542A Corrosion of first degree of left axilla, initial encounter
• T22.542D Corrosion of first degree of left axilla, subsequent encounter
• T22.542S Corrosion of first degree of left axilla, sequela
• T22.549 Corrosion of first degree of unspecified axilla
• T22.549A Corrosion of first degree of unspecified axilla, initial encounter (this code)
• T22.549D Corrosion of first degree of unspecified axilla, subsequent encounter
• T22.549S Corrosion of first degree of unspecified axilla, sequela
• T22.55 Corrosion of first degree of shoulder
• T22.551 Corrosion of first degree of right shoulder
• T22.551A Corrosion of first degree of right shoulder, initial encounter