W40.8XXA — Explosion of other specified explosive materials, initial encounter
Is W40.8XXA billable?
Yes, but W40.8XXA is an unspecified code. W40.8XXA is a valid, billable ICD-10-CM code for encounters from October 1, 2026 through September 30, 2027. However, W40.8XXA is an unspecified or catch-all code. Payers apply additional scrutiny to unspecified codes and many deny them when the medical record supports a more specific option, so check the documentation before selecting W40.8XXA — the more specific alternatives are listed below.
W40.8XXA at a glance
| Code | W40.8XXA |
|---|---|
| Description | Explosion of other specified explosive materials, 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 W40.8XXA?
In W40.8XXA, the 7th character A means initial encounter. The 7th character is required for W40.8XXA to be a valid, complete code.
Same condition, different episode of care — switch the 7th character:
How is W40.8XXA listed in the External Cause Index?
The External Cause of Injuries Index lists these routes under W40.8, the nearest indexed parent of W40.8XXA. This is a separate index from the Alphabetic Index and is where external cause codes are looked up.
- Explosion › antipersonnel bomb (accidental) (of) (with secondary fire)
- Explosion › dump (accidental) (of) (with secondary fire)
- Explosion › factory (accidental) (of) (with secondary fire)
- Explosion › fertilizer bomb (accidental) (of) (with secondary fire)
- Explosion › grain store (accidental) (of) (with secondary fire)
- Explosion › grenade (accidental) (of) (with secondary fire)
- Explosion › letter bomb (accidental) (of) (with secondary fire)
- Explosion › missile NEC (accidental) (of) (with secondary fire)
Excludes1 — never code together
The conditions below can never be reported together with W40.8XXA on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
Inclusion terms
Alternative wording in documentation that is classified to W40.8XXA.
- Explosion in dump NOS
- Explosion in factory NOS
- Explosion in grain store
- Explosion in munitions
Excludes1 — never code together — inherited from W20-W49
The conditions below can never be reported together with W40.8XXA 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 W40
The conditions below can never be reported together with W40.8XXA 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 W40.8
The conditions below can never be reported together with W40.8XXA on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
How long has W40.8XXA existed?
W40.8XXA 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.