MCMCB Pro
X37.1XXA

X37.1XXATornado, initial encounter

Billable / specific codeICD-10-CM

X37.1XXA is a billable, specific ICD-10-CM code for tornado, initial encounter. It is valid for submission on a claim.

7th character "A" — initial encounter

The appropriate 7th character is to be added to each code from category X37

A
initial encounter
D
subsequent encounter
S
sequela

Inclusion terms

Alternative wordings a physician may use in the chart for this same code.

  • Cyclone
  • Twister

Risk adjustment

X37.1XXA 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.

Related codes at this level

Codes that share X37.1. If X37.1XXA is not quite right, the correct code is usually one of these.

Questions about X37.1XXA

Is X37.1XXA a billable ICD-10-CM code?
Yes. X37.1XXA is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does X37.1XXA sit in the tabular list?
External causes of morbidity (V00-Y99), in the block Exposure to forces of nature (X30-X39).
ICD-10-CMFY2026-Apr· effective April 1, 2026

Loaded directly from the CMS/NCHS ICD-10-CM public-domain release — see data sources and our editorial policy. If this page disagrees with the CMS tabular list, this page is wrong. Reference information for professional coders; not medical or billing advice.