Main diagnosis codes contributing to the NCM difference
| ICD10 codes | ICD10 block description | % of NCM difference |
| R10-R19 | Symptoms and signs involving the digestive system and abdomen | 10.44% |
| N30-N39 | Other diseases of urinary system | 4.63% |
| I20-I25 | Ischaemic heart diseases | 4.57% |
| C00-C97 | Malignant neoplasms | 4.33% |
| K55-K63 | Other diseases of intestines | 4.28% |
| Z00-Z13 | Persons encountering health services for examination and investigation | 4.28% |
| J40-J47 | Chronic lower respiratory diseases | 4.08% |
| R50-R69 | General symptoms and signs | 3.97% |
| R00-R09 | Symptoms and signs involving the circulatory and respiratory systems | 3.69% |
| I30-I52 | Other forms of heart disease | 3.49% |
| K50-K52 | Non-infective enteritis and colitis | 3.48% |
| M40-M54 | Dorsopathies | 3.44% |
| M60-M79 | Soft tissue disorders | 3.26% |
| K20-K31 | Diseases of oesophagus, stomach and duodenum | 3.18% |
| N80-N98 | Non-inflammatory disorders of female genital tract | 3.11% |
| M00-M25 | Arthropathies | 2.89% |
| G40-G47 | Episodic and paroxysmal disorders | 2.74% |
| K80-K87 | Disorders of gall bladder, biliary tract and pancreas | 2.56% |
| D55-D59 | Haemolytic anaemias | 1.80% |
| E70-E90 | Metabolic disorders | 1.69% |
| N40-N51 | Diseases of male genital organs | 1.65% |
ICD 10, International Classification of Diseases 10th revision; NCM, non-case mix.