S89 – Other and unspecified injuries of lower leg

ICD-10-CM 2027 diagnosis code · Injuries to the knee and lower leg

Non-billable header

ICD-10-CM code S89

Code: S89 (claims format: S89)
Description: Other and unspecified injuries of lower leg
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: S80-S89 Injuries to the knee and lower leg

Billable codes under S89

S89 is a header code and cannot be used on claims. Choose the most specific code:

S89.0 – Physeal fracture of upper end of tibiaHeader (more codes below)
S89.1 – Physeal fracture of lower end of tibiaHeader (more codes below)
S89.2 – Physeal fracture of upper end of fibulaHeader (more codes below)
S89.3 – Physeal fracture of lower end of fibulaHeader (more codes below)
S89.8 – Other specified injuries of lower legHeader (more codes below)
S89.9 – Unspecified injury of lower legHeader (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 for closed fracture
`D`	subsequent encounter for fracture with routine healing
`G`	subsequent encounter for fracture with delayed healing
`K`	subsequent encounter for fracture with nonunion
`P`	subsequent encounter for fracture with malunion
`S`	sequela

Notes for S89

Excludes2 (not included here):

other and unspecified injuries of ankle and foot (S99.-)

Notes:

A fracture not indicated as open or closed should be coded to closed

7th character note:

The appropriate 7th character is to be added to each code from subcategories S89.0, S89.1, S89.2, and S89.3

Notes inherited from parent codes

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

Block S80-S89

Excludes2 (not included here):

burns and corrosions (T20-T32)
frostbite (T33-T34)
injuries of ankle and foot, except fracture of ankle and malleolus (S90-S99)
insect bite or sting, venomous (T63.4)

Frequently asked questions

What is ICD-10 code S89?

S89 is the ICD-10-CM code for other and unspecified injuries of lower leg, in the block S80-S89 (Injuries to the knee and lower leg).

Is S89 a billable code?

No. S89 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.