| DMBM525120 | General |
| DMBM525130 | Employers’ debts from NICO |
| DMBM525140 | Action by NICO |
| DMBM525150 | NICO cases - DMO actions |
| DMBM525160 | NICO cases - liability disputed before enforcement |
| DMBM525170 | NICO cases – transfer to other office |
| DMBM525180 | National Insurance avoidance schemes |
| DMBM525190 | Protective claims |
| DMBM525200 | Protective claims: Action by DMO |
| DMBM525210 | Avoidance schemes: NICs paid without interest |
| DMBM525220 | Interest disputed |
