S91.359S – Open bite, unspecified foot, sequela

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

Billable code

ICD-10-CM code S91.359S

Code: S91.359S (claims format: S91359S)
Description: Open bite, unspecified foot, sequela
Billable: Yes – valid for HIPAA-covered transactions
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
Parent codes: S91 › S91.3 › S91.35 › S91.359

7th character values

Codes in this category need a 7th character to describe the encounter or episode of care.

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

Notes inherited from parent codes

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

S91 – Open wound of ankle, foot and toes

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

S91.35 – Open bite of foot

Excludes1 (not coded here):

superficial bite of foot (S90.86-, S90.87-)

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)

Related codes in S91.359

Frequently asked questions

What is ICD-10 code S91.359S?

S91.359S is the ICD-10-CM code for open bite, unspecified foot, sequela, in the block S90-S99 (Injuries to the ankle and foot).

Is S91.359S a billable code?

Yes. S91.359S is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.

What category does S91.359S belong to?

It belongs to category S91 – Open wound of ankle, foot and toes.

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.