W00.9XXA vs W10

W00.9XXA (Unspecified fall due to ice and snow, initial encounter) compared with W10 (Fall on and from stairs and steps), from the official CMS tabular data. Do not report these codes together: the official tabular list marks them Excludes1.

Relationship

Conflict

Excludes1 conflict

W00.9XXA

Unspecified fall due to ice and snow, initial encounter

↔

W10

Fall on and from stairs and steps

Not coded here — these two are mutually exclusive.

“fall from stairs and steps not due to ice and snow (W10.-)”

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. W00.9XXA carries an Excludes1 note covering W10: “fall from stairs and steps not due to ice and snow (W10.-)”

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

	W00.9XXAUnspecified fall due to ice and snow, initial encounter	W10Fall on and from stairs and steps
Billing status	Billable	Non-billable header Report instead: W10.0XXA, W10.0XXD, W10.0XXS, W10.1XXA, W10.1XXD
Classification	V00-Y99 — External Causes of Morbidity (V00-Y99)	V00-Y99 — External Causes of Morbidity (V00-Y99)
Definition	Unspecified fall due to ice and snow, initial encounter is a billable ICD-10-CM diagnosis code (W00.9A).	Fall on and from stairs and steps is a non-billable ICD-10-CM category code (W10).
7th character	The appropriate 7th character is to be added to each code from category W00	The appropriate 7th character is to be added to each code from category W10
Includes	pedestrian on foot falling (slipping) on ice and snow	—

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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