X99.1XXA — Assault by knife, initial encounter
Is X99.1XXA billable?
Yes — X99.1XXA is billable for FY2027. X99.1XXA is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. X99.1XXA may be submitted for encounters from October 1, 2026 through September 30, 2027.
X99.1XXA at a glance
| Code | X99.1XXA |
|---|---|
| Description | Assault by knife, initial encounter |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
| 7th character "A" | initial encounter |
What does the 7th character "A" mean in X99.1XXA?
In X99.1XXA, the 7th character A means initial encounter. The 7th character is required for X99.1XXA to be a valid, complete code.
Same condition, different episode of care — switch the 7th character:
How is X99.1XXA listed in the External Cause Index?
The External Cause of Injuries Index lists these routes under X99.1, the nearest indexed parent of X99.1XXA. This is a separate index from the Alphabetic Index and is where external cause codes are looked up.
- Assault › knife (homicidal) (by) (in)
- Assault › cutting or piercing instrument › knife (homicidal) (by) (in)
- Assault › wound › knife (homicidal) (by) (in)
- Contact › with › knife › assault (accidental)
Excludes1 — never code together — inherited from X92-Y09
The conditions below can never be reported together with X99.1XXA on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
Excludes1 — never code together — inherited from X99
The conditions below can never be reported together with X99.1XXA on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
- assault by strike by sports equipment (Y08.0-)
How long has X99.1XXA existed?
X99.1XXA has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.