T23.642
⚠ Non-billable
Corrosion of second degree of multiple left fingers (nail), including thumb
ICD-10-CM · FY2026 · Injury, Poisoning and Certain Other Consequences of External Causes
Code
T23.642
System
ICD-10-CM
Billable
No — use specific code
Effective
FY2026
Chapter
Injury, Poisoning and Certain Other Consequences of External Causes
Source
CMS / CDC NCHS
⚠ Verify before billing. Confirm against the current CMS/NCHS ICD-10-CM files and your payer's rules before claims submission.
Frequently asked questions
What is ICD-10 code T23.642?
ICD-10-CM code T23.642 represents Corrosion of second degree of multiple left fingers (nail), including thumb. It is a non-billable header code requiring a more specific subcategory in the Injury, Poisoning and Certain Other Consequences of External Causes chapter, effective October 1, 2025 – September 30, 2026.
Is T23.642 billable?
No. T23.642 is a non-billable header. Select a more specific subcategory for claims submission.
What chapter is T23.642 in?
T23.642 belongs to the Injury, Poisoning and Certain Other Consequences of External Causes chapter (S00–T88) of ICD-10-CM.
Related codes in the T23 category
T23
Burn and corrosion of wrist and hand
Non-billable
T23.0
Burn of unspecified degree of wrist and hand
Non-billable
T23.1
Burn of first degree of wrist and hand
Non-billable
T23.2
Burn of second degree of wrist and hand
Non-billable
T23.3
Burn of third degree of wrist and hand
Non-billable
T23.4
Corrosion of unspecified degree of wrist and hand
Non-billable
T23.5
Corrosion of first degree of wrist and hand
Non-billable
T23.6
Corrosion of second degree of wrist and hand
Non-billable
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