S89.9 – Unspecified injury of lower leg

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

Non-billable header

ICD-10-CM code S89.9

Code: S89.9 (claims format: S899)
Description: Unspecified injury 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
Parent codes: S89

Billable codes under S89.9

S89.9 is a header code and cannot be used on claims. Choose the most specific code:

S89.90 – Unspecified injury of unspecified lower legHeader (more codes below)
S89.91 – Unspecified injury of right lower legHeader (more codes below)
S89.92 – Unspecified injury of left 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
`D`	subsequent encounter
`S`	sequela

Notes for S89.9

7th character note:

The appropriate 7th character is to be added to each code in subcategory S89.9

Notes inherited from parent codes

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

S89 – Other and unspecified injuries of lower leg

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

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)

Index terms for S89.9

Entries in the ICD-10-CM alphabetic index that lead to this code:

Related codes in S89

Frequently asked questions

What is ICD-10 code S89.9?

S89.9 is the ICD-10-CM code for unspecified injury of lower leg, in the block S80-S89 (Injuries to the knee and lower leg).

Is S89.9 a billable code?

No. S89.9 is a header code with more specific child codes; report one of the billable codes listed above.

What category does S89.9 belong to?

It belongs to category S89 – Other and unspecified injuries of lower leg.

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.