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ICD-10-CM 2027 diagnosis code

T20.64Corrosion of second degree of nose (septum)

Not billable — use a more specific codeRequires 7th character

T20.64 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.

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 T20.64

T20.64 is the ICD-10-CM diagnosis code for corrosion of second degree of nose (septum). It belongs to category T20 (burn and corrosion of head, face, and neck), 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 T20.6 (corrosion of second degree of head, face, and neck), T20.64 is specifically for corrosion of second degree of nose (septum). Related codes cover unspecified site (T20.60), ear [any part, except ear drum] (T20.61), lip(s) (T20.62), chin (T20.63), scalp [any part] (T20.65), forehead and cheek (T20.66), neck (T20.67) and multiple sites of head, face, and neck (T20.69).

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 T20

Notes that apply from higher levels

Instructions written at a parent level also apply to T20.64.

› From T20.6 Corrosion of second degree of head, face, and neck
Code first
  • (T51-T65) to identify chemical and intent
Use additional code
  • external cause code to identify place (Y92)
› From T20 Burn and corrosion of head, face, and neck
Excludes2
  • burn and corrosion of ear drum (T28.41, T28.91)
  • burn and corrosion of eye and adnexa (T26.-)
  • burn and corrosion of mouth and pharynx (T28.0)

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.

Alphabetic index entries

1 entries

Terms in the official ICD-10-CM index that lead to T20.64.

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 T20.64

Is T20.64 billable?

No. T20.64 is a header code. Report one of its more specific subcodes instead.