Table 2 Summary of the frequency and nature of three most commonly occurring diagnoses grouped by reason at OSICS-10 tier 2

Reason for level 2 classification	n	Per cent (%)	Diagnosis	n	Per cent (%)
Neither coding nor diagnostic inadequacy	19	27.1	Strain	6	31.6
			Sprain (Grade 1)	3	15.8
			Contusion	2	10.5
Due to lack of detail in code	30	49.2	Contusion	5	16.7
			Strain	4	13.3
			Joint effusion	3	10.0
Due to lack of detail in diagnosis	21	30.0	Sprain (Grade 1)	6	28.6
			Contusion	3	14.3
			Strain	2	9.5