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ICD-10-CM 2027 diagnosis code

T23.44Corrosion of unspecified degree of multiple fingers (nail), including thumb

Not billable — use a more specific codeRequires 7th character

T23.44 is a header code, so it can't be reported by itself. Choose one of the 3 more specific codes beneath it and add the required 7th character.Short description: Corrosion of unsp deg mult fingers (nail), including thumb

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About T23.44

T23.44 is the ICD-10-CM diagnosis code for corrosion of unspecified degree of multiple fingers (nail), including thumb. It belongs to category T23 (burn and corrosion of wrist and hand), block T20-T25 (burns and corrosions of external body surface, specified by site) and chapter 19 (injury, poisoning and certain other consequences of external causes). It is a header code, so it can't be reported by itself; one of its 3 subcodes must be used instead.

Within T23.4 (corrosion of unspecified degree of wrist and hand), T23.44 is specifically for corrosion of unspecified degree of multiple fingers (nail), including thumb. Related codes cover hand, unspecified site (T23.40), thumb (nail) (T23.41), single finger (nail) except thumb (T23.42), multiple fingers (nail), not including thumb (T23.43), palm (T23.45), back of hand (T23.46), wrist (T23.47) and multiple sites of wrist and hand (T23.49).

Codes in this range require a 7th character: A for initial encounter, D for subsequent encounter and S for sequela. Use placeholder "X" characters to fill any empty positions before the 7th character.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

7th character

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

  • Ainitial encounter
  • Dsubsequent encounter
  • Ssequela

Notes that apply from higher levels

Instructions written at a parent level also apply to T23.44.

› From T23.4 Corrosion of unspecified degree of wrist and hand
Code first
  • (T51-T65) to identify chemical and intent
Use additional code
  • external cause code to identify place (Y92)

Broader instructions also apply from T20-T25 Burns and corrosions of external body surface, specified by site and Chapter 19: Injury, poisoning and certain other consequences of external causes.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about T23.44

Is T23.44 billable?

No. T23.44 is a header code. Report one of its more specific subcodes instead.