External causes of morbidity and mortality (V01–Y99) ICD-10-CM
Chapter 20 of the ICD-10-CM classification spans codes V00–Y99 and contains 10,602 diagnosis codes for external causes of morbidity and mortality, of which 7,461 are billable. The chapter is organized into 34 sections listed below, each linking to its code ranges and individual codes.
Chapter Coding Notes
Note: This chapter permits the classification of environmental events and circumstances as the cause of injury, and other adverse effects. Where a code from this section is applicable, it is intended that it shall be used secondary to a code from another chapter of the Classification indicating the nature of the condition. Most often, the condition will be classifiable to Chapter 19, Injury, poisoning and certain other consequences of external causes (S00-T88). Other conditions that may be stated to be due to external causes are classified in Chapters I to XVIII. For these conditions, codes from Chapter 20 should be used to provide additional information as to the cause of the condition.
Sections in This Chapter 34 ranges · 10,602 codes
The info icon previews the code ranges inside each row and its instructional notations from the official Tabular List.
About Chapter 20
External causes describe events and circumstances linked to injury, illness, or death. The chapter separates accidents from intentional self-harm, assault, events of undetermined intent, legal intervention, war, military operations, terrorism, and medical care complications.
Accidents divide into transport accidents and other accidental injuries. Transport groups distinguish pedestrians and riders from occupants of different vehicles, then separate other land, water, air, and space transport. Other accidental injuries include falls, mechanical forces, drowning, exposure to electricity or fire, forces of nature, and overexertion.
Medical care complications divide into misadventures during care, adverse incidents involving medical devices, and reactions or later complications attributed to procedures. A separate group describes supplementary factors related to causes of illness classified elsewhere. Where an encounter character is listed, A means initial encounter, D means subsequent encounter, and S means sequela, a later effect.
Questions About This Page
How many codes are in the V00-Y99 range?
The V00-Y99 range contains 10,602 ICD-10-CM diagnosis codes in FY 2027. 7,461 of them are billable, and the rest are category headers that organize the chapter.
What conditions does V00-Y99 cover?
The range covers external causes of morbidity and mortality. The sections listed above break it into groups of related conditions, and each one links to its own page with the full code list.
Related References
Source: CMS FY 2027 ICD-10-CM Tabular List and order file, effective October 1, 2026 through September 30, 2027.
