S91 – Open wound of ankle, foot and toes

ICD-10-CM 2027 diagnosis code · Injuries to the ankle and foot

Non-billable header

ICD-10-CM code S91

Code: S91 (claims format: S91)
Description: Open wound of ankle, foot and toes
Billable: No – use a more specific code below
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 19. Injury, poisoning and certain other consequences of external causes (S00-T88)
Block: S90-S99 Injuries to the ankle and foot

Billable codes under S91

S91 is a header code and cannot be used on claims. Choose the most specific code:

S91.0 – Open wound of ankleHeader (more codes below)
S91.1 – Open wound of toe without damage to nailHeader (more codes below)
S91.2 – Open wound of toe with damage to nailHeader (more codes below)
S91.3 – Open wound of footHeader (more codes below)

7th character values

Codes in this category need a 7th character to describe the encounter or episode of care (use placeholder X for empty positions).

Character	Meaning
`A`	initial encounter
`D`	subsequent encounter
`S`	sequela

Notes for S91

Excludes1 (not coded here):

open fracture of ankle, foot and toes (S92.-with 7th character B)
traumatic amputation of ankle and foot (S98.-)

Code also:

any associated wound infection

7th character note:

The appropriate 7th character is to be added to each code from category S91

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

Block S90-S99

Excludes2 (not included here):

burns and corrosions (T20-T32)
fracture of ankle and malleolus (S82.-)
frostbite (T33-T34)
insect bite or sting, venomous (T63.4)

Frequently asked questions

What is ICD-10 code S91?

S91 is the ICD-10-CM code for open wound of ankle, foot and toes, in the block S90-S99 (Injuries to the ankle and foot).

Is S91 a billable code?

No. S91 is a header code with more specific child codes; report one of the billable codes listed above.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.