S91.25
Open bite of toe with damage to nail
S91.25 is a non-billable ICD-10-CM code header for open bite of toe with damage to nail. Report a more specific code from it instead. It is part of the FY2027 code set, effective October 1, 2026. The more specific codes under it are S91.251 Open bite of right great toe with damage to nail, S91.252 Open bite of left great toe with damage to nail, S91.253 Open bite of unspecified great toe with damage to nail, S91.254 Open bite of right lesser toe(s) with damage to nail and 3 more. Its coding notes include a Use additional code instruction, a Code also instruction, 3 Excludes1 entries and 6 Excludes2 entries.
7th characters
Every code below needs one of these (defined at S91).
The appropriate 7th character is to be added to each code from category S91
- Ainitial encounter
- Dsubsequent encounter
- Ssequela
Guidelines tips
From the FY2027 Official Guidelines. ICD10Ref adds no rules of its own.
The 7th character depends on whether the patient is in active treatment, not on who sees the patient. An aftercare Z code is not used for injury aftercare.
Each injury gets its own code unless a combination code exists, with the most serious injury first. Superficial injuries at the same site as a more severe injury are not coded. Injuries during medical care are coded as complications.
Use additional code
Add the listed code as a secondary code, if known.
Also from chapter/block level (1 note)
- code to identify any retained foreign body, if applicable (Z18.-)
Code also
Two codes may be needed to describe the condition. This note gives no sequencing order.
- any associated wound infection
Excludes1
Not coded here. The listed conditions generally should not be reported together.
Excludes2
Not included here. Both codes may be reported if the patient has both conditions.
Also from chapter/block level (6 notes)
- birth trauma (P10-P15)
- obstetric trauma (O70-O71)
Inclusion terms
Conditions classified to this code.
- Bite of toe with damage to nail NOS
Notes
Also from chapter/block level (2 notes)
- 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.
Alphabetic Index terms
Terms the official Alphabetic Index lists for this code. 3 entries
More specific codes under S91.25 7
- S91.251Open bite of right great toe with damage to nail7th char needed
- S91.252Open bite of left great toe with damage to nail7th char needed
- S91.253Open bite of unspecified great toe with damage to nail7th char needed
- S91.254Open bite of right lesser toe(s) with damage to nail7th char needed
- S91.255Open bite of left lesser toe(s) with damage to nail7th char needed
- S91.256Open bite of unspecified lesser toe(s) with damage to nail7th char needed
- S91.259Open bite of unspecified toe(s) with damage to nail7th char needed