V91.30XD vs Y36

V91.30XD (Hit or struck by falling object due to accident to merchant ship, subsequent encounter) compared with Y36 (Operations of war), from the official CMS tabular data. Do not report these codes together: the official tabular list marks them Excludes1.

Relationship

Conflict

Excludes1 conflict

V91.30XD

Hit or struck by falling object due to accident to merchant ship, subsequent encounter

↔

Y36

Operations of war

Not coded here — these two are mutually exclusive.

“military watercraft accident in military or war operations (Y36, Y37.-)”

An Excludes1 note means the two conditions cannot occur together, so the pair should not be reported for the same encounter. The sole exception is when the conditions are documented as unrelated to each other.

Source: CMS ICD-10-CM tabular instructional notes; ICD-10-CM Official Guidelines, Section I.A.12.a

Can these codes be reported together?

No — do not report together. V91.30XD carries an Excludes1 note covering Y36: “military watercraft accident in military or war operations (Y36, Y37.-)”

Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).

Side by side

	V91.30XDHit or struck by falling object due to accident to merchant ship, subsequent encounter	Y36Operations of war
Billing status	Billable	Non-billable header Report instead: Y36.000A, Y36.000D, Y36.000S, Y36.001A, Y36.001D
Classification	V00-Y99 — External Causes of Morbidity (V00-Y99)	V00-Y99 — External Causes of Morbidity (V00-Y99)
Definition	Hit or struck by falling object due to accident to merchant ship, subsequent encounter is a billable ICD-10-CM diagnosis code (V91.30D).	Operations of war is a non-billable ICD-10-CM category code (Y36).
7th character	The appropriate 7th character is to be added to each code from category V91	The appropriate 7th character is to be added to each code from category Y36
Includes	any injury except drowning and submersion as a result of an accident to watercraft	injuries to military personnel and civilians caused by war, civil insurrection, and peacekeeping missions

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Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources