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X37.9XXA

X37.9XXAUnspecified cataclysmic storm, initial encounter

Billable / specific codeICD-10-CM

X37.9XXA is a billable, specific ICD-10-CM code for unspecified cataclysmic storm, 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

Excludes1 — never code together

These conditions cannot occur together. Billing both on the same encounter is a denial.

  • collapse of dam or man-made structure causing earth movement (X36.0)

Inclusion terms

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

  • Storm NOS

Risk adjustment

X37.9XXA 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 X37.9. If X37.9XXA is not quite right, the correct code is usually one of these.

Questions about X37.9XXA

Is X37.9XXA a billable ICD-10-CM code?
Yes. X37.9XXA is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does X37.9XXA sit in the tabular list?
External causes of morbidity (V00-Y99), in the block Exposure to forces of nature (X30-X39).
What cannot be coded together with X37.9XXA?
X37.9XXA carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.
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.