T23.642A Corrosion of second degree of multiple left fingers (nail), including thumb, initial encounter

Billable ICD-10-CM code, FY2026.

Built from T23.642 with 7th character A (initial encounter).

Applies from T23 Burn and corrosion of wrist and hand

7th character note

• The appropriate 7th character is to be added to each code from category T23

7th character required

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

Applies from T23.6 Corrosion of second degree of 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 T23.642A

Back-references to T23

• Type 2 Excludes: T22 Burn and corrosion of shoulder and upper limb, except wrist and hand ("burn and corrosion of wrist and hand (T23.-)")
• 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 T23.642A

• Corrosion (injury) (acid) (caustic) (chemical) (lime) (external) (internal) › finger › multiple sites (without thumb) › with thumb › left › second degree
• Corrosion (injury) (acid) (caustic) (chemical) (lime) (external) (internal) › thumb (s) › multiple sites with fingers › left › second degree

Nearby codes

• T23.641 Corrosion of second degree of multiple right fingers (nail), including thumb
• T23.641A Corrosion of second degree of multiple right fingers (nail), including thumb, initial encounter
• T23.641D Corrosion of second degree of multiple right fingers (nail), including thumb, subsequent encounter
• T23.641S Corrosion of second degree of multiple right fingers (nail), including thumb, sequela
• T23.642 Corrosion of second degree of multiple left fingers (nail), including thumb
• T23.642A Corrosion of second degree of multiple left fingers (nail), including thumb, initial encounter (this code)
• T23.642D Corrosion of second degree of multiple left fingers (nail), including thumb, subsequent encounter
• T23.642S Corrosion of second degree of multiple left fingers (nail), including thumb, sequela
• T23.649 Corrosion of second degree of unspecified multiple fingers (nail), including thumb
• T23.649A Corrosion of second degree of unspecified multiple fingers (nail), including thumb, initial encounter
• T23.649D Corrosion of second degree of unspecified multiple fingers (nail), including thumb, subsequent encounter