T23.319A Burn of third degree of unspecified thumb (nail), initial encounter

Billable ICD-10-CM code, FY2026.

Built from T23.319 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 T23.3 Burn of third degree of wrist and hand

Use additional code

• external cause code to identify the source, place and intent of the burn (X00-X19, X75-X77, X96-X98, Y92)

Medicare Code Edits (MCE v43.1 (April 2026))

• Unspecified code (laterality): Unspecified codes for which a more specific code identifying laterality (right, left, bilateral) exists within the same code family.

Code annotations containing back-references to T23.319A

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 T23.319A

• Burn (electricity) (flame) (hot gas, liquid or hot object) (radiation) (steam) (thermal) › thumb (s) › third degree

Nearby codes

• T23.312 Burn of third degree of left thumb (nail)
• T23.312A Burn of third degree of left thumb (nail), initial encounter
• T23.312D Burn of third degree of left thumb (nail), subsequent encounter
• T23.312S Burn of third degree of left thumb (nail), sequela
• T23.319 Burn of third degree of unspecified thumb (nail)
• T23.319A Burn of third degree of unspecified thumb (nail), initial encounter (this code)
• T23.319D Burn of third degree of unspecified thumb (nail), subsequent encounter
• T23.319S Burn of third degree of unspecified thumb (nail), sequela
• T23.32 Burn of third degree of single finger (nail) except thumb
• T23.321 Burn of third degree of single right finger (nail) except thumb
• T23.321A Burn of third degree of single right finger (nail) except thumb, initial encounter