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T25.639Non-billableSave

T25.639 - Corrosion of second degree of unspecified toe(s) (nail)

ICD-10-CM Chapter 19: Injury, poisoning and certain other consequences of external causes · T20-T25 Burns and corrosions of external body surface, specified by site (T20-T25) · Subcategory of T25.63 · FY2027

Coding Guidance

T25.639 requires a 7th character. Report the code below that matches the documentation, for example A for initial encounter, D for subsequent encounter, S for sequela.

7th Character

The appropriate 7th character is to be added to each code from category T25

Includes, Excludes and Coding Notes

Use Additional CodeFrom T25.6

Add a secondary code to identify the associated condition or cause when it is documented.

  • external cause code to identify place (Y92)
Code FirstFrom T25.6

Sequence the underlying condition before this code.

  • (T51-T65) to identify chemical and intent
IncludesFrom T20-T25 Burns and corrosions of external body surface, specified by site (T20-T25)

Conditions this code covers.

  • burns and corrosions of first degree [erythema]
  • burns and corrosions of second degree [blisters][epidermal loss]
  • burns and corrosions of third degree [deep necrosis of underlying tissue] [full- thickness skin loss]
Use Additional CodeFrom T20-T25 Burns and corrosions of external body surface, specified by site (T20-T25)

Add a secondary code to identify the associated condition or cause when it is documented.

  • code from category T31 or T32 to identify extent of body surface involved
Excludes 2 — Not Included HereFrom Chapter S00-T88

Not part of this code; report both codes when the patient has both conditions.

  • birth trauma (P10-P15)
  • obstetric trauma (O70-O71)
Use Additional CodeFrom Chapter S00-T88

Add a secondary code to identify the associated condition or cause when it is documented.

  • code to identify any retained foreign body, if applicable (Z18.-)
NotesFrom Chapter S00-T88

Instructional notes from the ICD-10-CM tabular list.

  • Use secondary code(s) from Chapter 20, External causes of morbidity, to indicate cause of injury. Codes within the T section that include the external cause do not require an additional external cause code
  • The chapter uses the S-section for coding different types of injuries related to single body regions and the T-section to cover injuries to unspecified body regions as well as poisoning and certain other consequences of external causes.

More Specific Codes (3)

T25.639ACorrosion of second degree of unspecified toe(s) (nail), initial encounter→T25.639DCorrosion of second degree of unspecified toe(s) (nail), subsequent encounter→T25.639SCorrosion of second degree of unspecified toe(s) (nail), sequela→