X37.42 — Tidal wave due to storm
X37.42 is a non-billable header ICD-10-CM code for tidal wave due to storm. It cannot be billed on its own: choose one of the more specific child codes below. This code also requires a 7th character before it is complete.
This code requires a 7th character
The appropriate 7th character is to be added to each code from category X37
- A
- initial encounter
- D
- subsequent encounter
- S
- sequela
Other codes that can never be billed with X37.42
These codes carry an Excludes1 note pointing at X37.42. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading X37.42 alone.
Risk adjustment
X37.42 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.
How X37.42 is indexed
Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to X37.42.
- Forces of nature›tidal wave›due to›storm
Code to one of these instead X37.42
3 child codes. Green means billable.
Related codes at this level
Codes that share X37.4. If X37.42 is not quite right, the correct code is usually one of these.
Questions about X37.42
- Is X37.42 a billable ICD-10-CM code?
- No. X37.42 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
- Where does X37.42 sit in the tabular list?
- External causes of morbidity (V00-Y99), in the block Exposure to forces of nature (X30-X39).