Table 1.

The topics of extension codes in ICD-11-MMS, with examples

Topics	Types and examples
Severity scale value	None, mild, moderate…. Grade 0/1/2…
Temporality	Course of the condition. Time in life. Pregnancy duration
Aetiology	Causation. Infectious agents. Allergens
Topology scale value	Relational. Distributional. Laterality. Regional
Anatomy and topography	Functional anatomy. Body regions. Partonomic view
Histopathology	Gliomas: benign, malignant, uncertain, in situ
Dimensions of injury	Types of fractures and whether open or into a joint
Dimensions of external causes	Type and part of place. Activity. Objects. Alcohol and drugs
Consciousness	Components of Glasgow Coma Scale. Pupil reaction
Substances	Medicaments (e.g., oxycodone). Chemicals (e.g., parathion)
Diagnosis code descriptors	Diagnosis timing/certainty/method of confirmation
Capacity or context	Condition of fetus/newborn reported in context of the mother
Health devices, equipment, and supplies	Medical devices, surgical instruments, dialysis supplies