W40.1XXA — Explosion of explosive gases, initial encounter
Is W40.1XXA billable?
Yes — W40.1XXA is billable for FY2027. W40.1XXA is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. W40.1XXA may be submitted for encounters from October 1, 2026 through September 30, 2027.
W40.1XXA at a glance
| Code | W40.1XXA |
|---|---|
| Description | Explosion of explosive gases, 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 W40.1XXA?
In W40.1XXA, the 7th character A means initial encounter. The 7th character is required for W40.1XXA to be a valid, complete code.
Same condition, different episode of care — switch the 7th character:
How is W40.1XXA listed in the External Cause Index?
The External Cause of Injuries Index lists these routes under W40.1, the nearest indexed parent of W40.1XXA. This is a separate index from the Alphabetic Index and is where external cause codes are looked up.
- Explosion › acetylene (accidental) (of) (with secondary fire)
- Explosion › anesthetic gas in operating room (accidental) (of) (with secondary fire)
- Explosion › butane (accidental) (of) (with secondary fire)
- Explosion › coal gas (accidental) (of) (with secondary fire)
- Explosion › fire-damp (accidental) (of) (with secondary fire)
- Explosion › gas (accidental) (of) (with secondary fire)
- Explosion › gasolinenot in moving motor vehicle (accidental) (of) (with secondary fire)
- Explosion › methane (accidental) (of) (with secondary fire)
Inclusion terms
Alternative wording in documentation that is classified to W40.1XXA.
- Explosion of acetylene
- Explosion of butane
- Explosion of coal gas
- Explosion in mine NOS
- Explosion of explosive gas
- Explosion of fire damp
- Explosion of gasoline fumes
- Explosion of methane
- Explosion of propane
Excludes1 — never code together — inherited from W20-W49
The conditions below can never be reported together with W40.1XXA 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 W40
The conditions below can never be reported together with W40.1XXA on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
How long has W40.1XXA existed?
W40.1XXA 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.