W94.21 — Exposure to reduction in atmospheric pressure while surfacing from deep-water diving
Is W94.21 billable?
No — W94.21 is a non-billable header code. W94.21 groups more specific codes and cannot be submitted on a claim. A valid ICD-10-CM code must be reported at the highest level of specificity available in its branch. Select one of the 3 billable codes beneath W94.21.
Billable codes under this header
- W94.21XAExposure to reduction in atmospheric pressure while surfacing from deep-water diving, initial encounter
- W94.21XDExposure to reduction in atmospheric pressure while surfacing from deep-water diving, subsequent encounter
- W94.21XSExposure to reduction in atmospheric pressure while surfacing from deep-water diving, sequela
W94.21 at a glance
| Code | W94.21 |
|---|---|
| Description | Exposure to reduction in atmospheric pressure while surfacing from deep-water diving |
| Billable | No — header code |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
How is W94.21 listed in the External Cause Index?
These are the routes through the External Cause of Injuries Index that lead to W94.21 — how the injury happened, rather than what the injury was.
- Air › pressure › change, rapid › during › ascent › while › deep water diving
Excludes1 — never code together — inherited from W85-W99
The conditions below can never be reported together with W94.21 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
What codes fall under W94.21? (3)
- W94.21XAExposure to reduction in atmospheric pressure while surfacing from deep-water diving, initial encounter
- W94.21XDExposure to reduction in atmospheric pressure while surfacing from deep-water diving, subsequent encounter
- W94.21XSExposure to reduction in atmospheric pressure while surfacing from deep-water diving, sequela
How long has W94.21 existed?
W94.21 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.