Is S02.109K a billable ICD-10-CM code?

Yes. S02.109K is a billable, specific ICD-10-CM code and is valid for submission on a claim.

Where does S02.109K sit in the tabular list?

Injury, poisoning and certain other consequences of external causes (S00-T88), in the block Injuries to the head (S00-S09).

S02.109K

S02.109K — Fracture of base of skull, unspecified side, subsequent encounter for fracture with nonunion

Billable / specific codeICD-10-CMPOA exemptunspecified

S02.109K is a billable, specific ICD-10-CM code for fracture of base of skull, unspecified side, subsequent encounter for fracture with nonunion. It is valid for submission on a claim.

7th character "K" — subsequent encounter for fracture with nonunion

The appropriate 7th character is to be added to each code from category S02

A: initial encounter for closed fracture
B: initial encounter for open fracture
D: subsequent encounter for fracture with routine healing
G: subsequent encounter for fracture with delayed healing
K: subsequent encounter for fracture with nonunion
S: sequela

Excludes2 inherited from the categories above S02.109K

Also inherited, and the opposite of Excludes1: these conditions are not part of S02.109K, but a patient can have both, so you may code both.

Written on S02.1 — Fracture of base of skull

lateral orbital wall (S02.84-)
medial orbital wall (S02.83-)
orbital floor (S02.3-)

Other codes that can never be billed with S02.109K

These codes carry an Excludes1 note pointing at S02.109K. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading S02.109K alone.

S01Open wound of head

Risk adjustment

S02.109K does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.

Medicare coverage

S02.109K is named in 1 Medicare coverage policy — 1 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.

A56612Billing and Coding: CT of the Head

Code history

S02.109K has not changed since FY2024 — no addition, revision or deletion across the three most recent ICD-10-CM releases.

Related codes at this level

Codes that share S02.109. If S02.109K is not quite right, the correct code is usually one of these.

Questions about S02.109K

Is S02.109K a billable ICD-10-CM code?: Yes. S02.109K is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does S02.109K sit in the tabular list?: Injury, poisoning and certain other consequences of external causes (S00-T88), in the block Injuries to the head (S00-S09).