Is S13.18 a billable ICD-10-CM code?

No. S13.18 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does S13.18 sit in the tabular list?

Injury, poisoning and certain other consequences of external causes (S00-T88), in the block Injuries to the neck (S10-S19).

S13.18

S13.18 — Subluxation and dislocation of C7/T1 cervical vertebrae

Non-billable headerICD-10-CM

S13.18 is a non-billable header ICD-10-CM code for subluxation and dislocation of c7/t1 cervical vertebrae. It cannot be billed on its own: choose one of the more specific child codes below. This code also requires a 7th character before it is complete.

This code requires a 7th character

The appropriate 7th character is to be added to each code from category S13

A: initial encounter
D: subsequent encounter
S: sequela

Excludes2 inherited from the categories above S13.18

Also inherited, and the opposite of Excludes1: these conditions are not part of S13.18, but a patient can have both, so you may code both.

Written on S13.1 — Subluxation and dislocation of cervical vertebrae

fracture of cervical vertebrae (S12.0-S12.3-)

Written on S13 — Dislocation and sprain of joints and ligaments at neck level

strain of muscle or tendon at neck level (S16.1)

Risk adjustment

S13.18 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.

Code history

S13.18 has not changed since FY2024 — no addition, revision or deletion across the three most recent ICD-10-CM releases.

Code to one of these instead S13.18

2 child codes. Green means billable.

Related codes at this level

Codes that share S13.1. If S13.18 is not quite right, the correct code is usually one of these.

Questions about S13.18

Is S13.18 a billable ICD-10-CM code?: No. S13.18 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does S13.18 sit in the tabular list?: Injury, poisoning and certain other consequences of external causes (S00-T88), in the block Injuries to the neck (S10-S19).