S09.90XA – Unspecified injury of head, initial encounter

ICD-10-CM 2027 diagnosis code · Injuries to the head

Billable code

ICD-10-CM code S09.90XA

Code: S09.90XA (claims format: S0990XA)
Description: Unspecified injury of head, initial encounter
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: S00-S09 Injuries to the head
Parent codes: S09 › S09.9 › S09.90

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.

S09 – Other and unspecified injuries of head

7th character note:

The appropriate 7th character is to be added to each code from category S09

S09.90 – Unspecified injury of head

Applicable to:

Head injury NOS

Excludes1 (not coded here):

brain injury NOS (S06.9-)
head injury NOS with loss of consciousness (S06.9-)
intracranial injury NOS (S06.9-)

Block S00-S09

Includes:

injuries of ear
injuries of eye
injuries of face [any part]
injuries of gum
injuries of jaw
injuries of oral cavity
injuries of palate
injuries of periocular area
injuries of scalp
injuries of temporomandibular joint area
injuries of tongue
injuries of tooth

Excludes2 (not included here):

burns and corrosions (T20-T32)
effects of foreign body in ear (T16)
effects of foreign body in larynx (T17.3)
effects of foreign body in mouth NOS (T18.0)
effects of foreign body in nose (T17.0-T17.1)
effects of foreign body in pharynx (T17.2)
effects of foreign body on external eye (T15.-)
frostbite (T33-T34)
insect bite or sting, venomous (T63.4)

Code also:

for any associated infection

Related codes in S09.90

Frequently asked questions

What is ICD-10 code S09.90XA?

S09.90XA is the ICD-10-CM code for unspecified injury of head, initial encounter, in the block S00-S09 (Injuries to the head).

Is S09.90XA a billable code?

Yes. S09.90XA is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.

What category does S09.90XA belong to?

It belongs to category S09 – Other and unspecified injuries of head.

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.