| 3rd character | 4th character | 5th character | |
| External cause blocks | |||
| Transport events | Counterpart involved | Role of patient and whether traffic/non-traffic event (except V90–V97 where 4th character signifies type of vehicle) | Type of vehicle; assault only—perpetrator of assault (eg, spouse, parent) |
| Falls | Broad product or surface involved (eg, bed, chair) | Specific product or surface involved (eg, bunk bed, rocking chair) | Assault only—perpetrator of assault (eg spouse, parent) |
| Drowning and submersion | Broad body of water where it occurred (eg, bath, pool) and whether it occurred while in/falling into water | Specific body of water where it occurred (eg, bath-tub, spa) | Assault only—perpetrator of assault (eg, spouse, parent) |
| Other threats to breathing | Where or what caused threat (eg, while in bed, due to cave-in) | Intentional self harm only—details regarding threat (eg, hanging, strangulation, suffocation) | Assault only—perpetrator of assault (eg, spouse, parent) |
| Smoke, fire, flames | Nature of fire (eg, controlled, ignition) and material involved (eg, building, flammable material) | NA | Assault only—perpetrator of assault (eg, spouse, parent) |
| Hot object or substance | Broad object or substance (eg, liquid, steam, appliance) | Specific object or substance (eg, hot drink, radiator, kettle) | Assault only—perpetrator of assault (eg, spouse, parent) |
| Poisoning | Substance involved (eg, analgesic, sedative, narcotic) | Intentional self harm only—specific types of gas (eg, motor vehicle exhaust, LPG) | Assault only—perpetrator of assault (eg, spouse, parent) |
| Firearm | Broad type of firearm (eg, handgun) | Intentional self harm/assault only—other types of firearm (eg, air rifle, shotgun) | Assault only—perpetrator of assault (eg, spouse, parent) |
| Cutting, piercing object | Broad type of object (eg, glass, knife) | Intentional self harm/assault only—specific type of object (eg, razor blade) | Assault only—perpetrator of assault (eg, spouse, parent) |
| Animal related | Type of animal (eg, dog, rat) and nature of contact (eg, bitten, contact with) | Other type of animal (eg, horse, cat) | For animal-related transport events only—role of patient and type of animal (eg, rider of horse, occupant of animal drawn vehicle) |
| Machinery in operation | Broad type of machinery (eg, agricultural, household) | Specific type of machinery (eg, grinder, chainsaw) | Specific subtype of machinery (eg, posthole digger, slasher) |
| Electricity | Source of current (eg, transmission lines) | NA | NA |
| Hot and cold conditions | Source of condition (eg, sunlight) | NA | NA |
| Struck by or collision person | Nature of collision (eg, hit by, striking against) | NA | Assault only—perpetrator of assault (eg, spouse, parent) |
| Struck by or collision object | Nature of collision (eg, hit by, striking against) and broad type of object (eg sports equipment) | Specific type of object (eg, bat, ball) | Assault only—perpetrator of assault (eg, spouse, parent) |
| Other external cause* | Not provided | Not provided | Not provided |
| Activity blocks | |||
| Sports and leisure | Broad type of sport (eg, team ball sports, team bat sport) | Specific type of sport (eg, football, hockey) | Specific subtype of sport (eg, rugby league, ice hockey) |
| Working for an income | Same 3-character code (U73) for all of these activities | Working for an income—single code | Type of industry (eg, agriculture, mining) |
| Other types of work | Other types of work—single code | NA | |
| Resting, sleeping, eating | Resting, sleeping, eating—single code | NA | |
| Other specified | Other specified—single code | NA | |
| Unspecified | Unspecified—single code | NA | |
| Place blocks | |||
| Home | Same 3-character code (Y92) for all of these places | Home—single code | Location in the home (eg, driveway) |
| Residential institution | Residential institution—single code | Type of institution (eg, prison, military camp) | |
| School/public admin area | School/public admin area—single code | Type of institution (eg, school, health service) | |
| Sports area | Sports area—single code | Type of sports area (eg, outdoor grounds, swimming centre) | |
| Street and highway | Street and highway—single code | Type of street (eg, roadway, sidewalk) | |
| Trade and service area | Trade and service area—single code | Type of trade area (eg, shop, office) | |
| Industrial/construction area | Industrial/construction area—single code | Type of industrial area (eg, construction area, demolition site) | |
| Farm | Farm—single code | Na | |
| Other specific place | Other specific place—single code | Other places (eg, beach, forest) | |
| Unspecified place | Unspecified place—single code | Na | |
*Heterogeneous group of codes unable to be compared at 3rd, 4th and 5th character level.
“NA” signifies that there are no characters at that particular level.