Is Y37.331 a billable ICD-10-CM code?

No. Y37.331 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does Y37.331 sit in the tabular list?

External causes of morbidity (V00-Y99), in the block Legal intervention, operations of war, military operations, and terrorism (Y35-Y38).

What cannot be coded together with Y37.331?

Y37.331 carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above Y37.331 (Y37.3, Y37) and apply to it just the same.

Y37.331

Y37.331 — Military operations involving flamethrower, civilian

Non-billable headerICD-10-CM

Y37.331 is a non-billable header ICD-10-CM code for military operations involving flamethrower, civilian. 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 Y37

A: initial encounter
D: subsequent encounter
S: sequela

Excludes1 inherited from the categories above Y37.331

These are not written on Y37.331, but they bind it: a note on a category applies to every code beneath it. Billing Y37.331 with anything listed here is a denial.

Written on Y37.3 — Military operations involving fires, conflagrations and hot substances

military operations involving fires and conflagrations aboard military aircraft (Y37.1-)
military operations involving fires and conflagrations aboard military watercraft (Y37.0-)
military operations involving fires and conflagrations caused indirectly by conventional weapons (Y37.2-)
military operations involving fires and thermal effects of nuclear weapons (Y36.53-)

Written on Y37 — Military operations

military aircraft involved in aircraft accident with civilian aircraft (V97.81-)
military vehicles involved in transport accident with civilian vehicle (V09.01, V09.21, V19.81, V29.818, V39.81, V49.81, V59.81, V69.81, V79.81)
military watercraft involved in water transport accident with civilian watercraft (V94.81-)
war operations (Y36.-)

Other codes that can never be billed with Y37.331

These codes carry an Excludes1 note pointing at Y37.331. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading Y37.331 alone.

V91Other injury due to accident to watercraft
V93Other injury due to accident on board watercraft, without accident to watercraft
W49Exposure to other inanimate mechanical forces
Y36Operations of war

Risk adjustment

Y37.331 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.

Code history

Y37.331 has not changed since FY2024 — no addition, revision or deletion across the three most recent ICD-10-CM releases.

Code to one of these instead Y37.331

3 child codes. Green means billable.

Related codes at this level

Codes that share Y37.33. If Y37.331 is not quite right, the correct code is usually one of these.

Y37.330Military operations involving flamethrower, military personnel

Questions about Y37.331

Is Y37.331 a billable ICD-10-CM code?: No. Y37.331 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does Y37.331 sit in the tabular list?: External causes of morbidity (V00-Y99), in the block Legal intervention, operations of war, military operations, and terrorism (Y35-Y38).
What cannot be coded together with Y37.331?: Y37.331 carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above Y37.331 (Y37.3, Y37) and apply to it just the same.