S59.91 – Unspecified injury of forearm

ICD-10-CM 2027 diagnosis code · Injuries to the elbow and forearm

Non-billable header

ICD-10-CM code S59.91

Code: S59.91 (claims format: S5991)
Description: Unspecified injury of forearm
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: S50-S59 Injuries to the elbow and forearm
Parent codes: S59 › S59.9

Billable codes under S59.91

S59.91 is a header code and cannot be used on claims. Choose the most specific code:

S59.911 – Unspecified injury of right forearmHeader (more codes below)
S59.912 – Unspecified injury of left forearmHeader (more codes below)
S59.919 – Unspecified injury of unspecified forearmHeader (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 inherited from parent codes

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

S59 – Other and unspecified injuries of elbow and forearm

Excludes2 (not included here):

other and unspecified injuries of wrist and hand (S69.-)

7th character note:

The appropriate 7th character is to be added to each code from subcategories S59.0, S59.1, and S59.2

S59.9 – Unspecified injury of elbow and forearm

7th character note:

The appropriate 7th character is to be added to each code in subcategory S59.9

Block S50-S59

Excludes2 (not included here):

burns and corrosions (T20-T32)
frostbite (T33-T34)
injuries of wrist and hand (S60-S69)
insect bite or sting, venomous (T63.4)

Index terms for S59.91

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

Injury, forearm

Related codes in S59.9

S59.90 – Unspecified injury of elbowHeader

Frequently asked questions

What is ICD-10 code S59.91?

S59.91 is the ICD-10-CM code for unspecified injury of forearm, in the block S50-S59 (Injuries to the elbow and forearm).

Is S59.91 a billable code?

No. S59.91 is a header code with more specific child codes; report one of the billable codes listed above.

What category does S59.91 belong to?

It belongs to category S59 – Other and unspecified injuries of elbow and forearm.

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.