Is X99.1XXD a billable ICD-10-CM code?

Yes. X99.1XXD is a billable, specific ICD-10-CM code and is valid for submission on a claim.

Where does X99.1XXD sit in the tabular list?

External causes of morbidity (V00-Y99), in the block Assault (X92-Y09).

What cannot be coded together with X99.1XXD?

X99.1XXD carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above X99.1XXD (X99) and apply to it just the same.

X99.1XXD

X99.1XXD — Assault by knife, subsequent encounter

Billable / specific codeICD-10-CMPOA exempt

X99.1XXD is a billable, specific ICD-10-CM code for assault by knife, subsequent encounter. It is valid for submission on a claim.

7th character "D" — subsequent encounter

The appropriate 7th character is to be added to each code from category X99

A: initial encounter
D: subsequent encounter
S: sequela

Excludes1 inherited from the categories above X99.1XXD

These are not written on X99.1XXD, but they bind it: a note on a category applies to every code beneath it. Billing X99.1XXD with anything listed here is a denial.

Written on X99 — Assault by sharp object

assault by strike by sports equipment (Y08.0-)

Risk adjustment

X99.1XXD 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

X99.1XXD 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 X99.1. If X99.1XXD is not quite right, the correct code is usually one of these.

Questions about X99.1XXD

Is X99.1XXD a billable ICD-10-CM code?: Yes. X99.1XXD is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does X99.1XXD sit in the tabular list?: External causes of morbidity (V00-Y99), in the block Assault (X92-Y09).
What cannot be coded together with X99.1XXD?: X99.1XXD carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above X99.1XXD (X99) and apply to it just the same.