ICD-10-CM Coding Guidelines - External Causes of Morbidity (Chapter 20)

ICD-10-CM Coding Guidelines - External Causes of Morbidity (Chapter 20)

Chapter 20 of ICD-10-CM is titled "External Causes of Morbidity," which includes categories V00-Y99. There are numerous coding guidelines that apply to this chapter. Reasons for wounds, injuries, poisonings, and adverse effects of medications require the circumstances to be reported. External cause codes are secondary codes used for providing data for injury research and evaluation of strategies for injury prevention. These codes identify the cause, intent, and location where the patient was injured, as well as the patient's status and activity that was being performed.

External Causes of Injury for Transport Accidents

  • V00-V09 Pedestrian Injured in Transport Accident

  • V10-V19 Pedal Cycle Rider Injured in Transport Accident

  • V20-V29 Motorcycle Rider Injured in Transport Accident

  • V30-V39 Occupant of Three-Wheeled Motor Vehicle Injured in Transport Accident

  • V40-V49 Car Occupant Injured in Transport Accident

  • V50-V59 Occupant of Pickup Truck or Van Injured in Transport Accident

  • V60-V69 Occupant of Heavy Transport Vehicle Injured In Transport Accident

  • V70-V79 Bus Occupant Injured in Transport Accident

  • V80-V89 Other Land Transport Accidents

  • V90-V94 Water Transport Accident

  • V95-V97 Air and Space Transport Accidents

  • V98-V99 Other and Unspecified Transport Accidents

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Injuries Due to Falls and Exposure

  • W00-W19 Slipping, Tripping, Stumbling, and Falls

  • W20-W49 Exposure to Inanimate Mechanical Forces

  • W50-W64 Exposure to Animate Mechanical Forces

  • W65-W74 Accidental Non-Transport Drowning and Submersion

  • W85-W99 Exposure to Electric Current, Radiation, and Extreme Ambient Air Temperature and Pressure

  • X00-X08 Exposure to Smoke, Fire, and Flames

  • X10-X19 Contact with Heat and Hot Substances

  • X30-X39 Exposure to Forces of Nature

  • X52-X58 Accidental Exposure to Other Specified Factors

Injuries Due to Self-Harm, Assault, or Undetermined Intent

  • X71-X83 Intentional Self-Harm

  • X92-Y09 Assault

  • Y21-Y33 Event of Undetermined Intent

Legal, Military, and Medical Causes and Supplementary Factors

  • Y35-Y38 Legal Intervention, Operations of War, Military Operations, and Terrorism

  • Y62-Y69 Misadventures to Patients during Surgical and Medical Care

  • Y70-Y82 Medical Devices Associated with Adverse Incidents in Diagnostic and Therapeutic Use

  • Y83-Y84 Surgical and Other Medical Procedures as the Cause of Abnormal Reaction of the Patient or of Later Complication, without Mention of Misadventure at the Time of the Procedure

  • Y90-Y99 Supplementary Factors Related to Causes of Morbidity Classified Elsewhere

General Guidelines

  • External codes to report child and adult abuse take priority over any other external cause codes. After child and adult abuse, the priority for sequencing is external cause codes for reporting terrorism events, catacycsmic events, and transport accidents.

  • The first-listed external cause code is the one that corresponds most with the cause of the most serious diagnosis due to an assault, an accident, or self-harm.

  • If code W21.4 is used for striking against a diving board, a secondary code from W16.- should be assigned for fall into water.

  • When reporting transport accidents, additional codes should be used if there is documentation of an injury by the vehicle airbag or when the driver was using a cellular phone at the time of the accident.

  • Pedestrian accidents in category V00 are those involving skateboards, in-line roller skates, roller skates, non-motorized scooters, ice-skates, heelies, sleds, snowboards, snow skis, wheelchairs, baby strollers, or motorized mobility scooters.

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