| Code | Description | Deutsch (German) | Version | 
| CDM  | Charge description master file | Leistungskatalog | added v2.2 | 
| CLN  | Clinic master file |  | added v2.4 | 
| CM0  | Clinical study master |  | added v2.3, removed after v2.3 | 
| CM1  | Clinical study phase master |  | added v2.3, removed after v2.3 | 
| CM2  | Clinical study Data Schedule Master |  | added v2.3, removed after v2.3 | 
| CMA  | Clinical study with phases and scheduled master file |  | added v2.3.1 | 
| CMB  | Clinical study without phases but with scheduled master file |  | added v2.3.1 | 
| INV  | Inventory master file |  | added v2.5 | 
| LOC  | Location master file |  | added v2.3 | 
| MACP  | Medicare Approved Coverage Process |  | added v2.8.2 | 
| MLCP  | Medicare Limited Coverage Process |  | added v2.8.2 | 
| OM1  | Observation text master file segments (e.g., Lab) |  | added v2.2, removed after v2.3 | 
| OM1-OM6  | Observation text master file segments (e.g., Lab) |  | added v2.3, removed after v2.3 | 
| OM2  | Observation text master file segments (e.g., Lab) |  | added v2.2, removed after v2.3 | 
| OM3  | Observation text master file segments (e.g., Lab) |  | added v2.2, removed after v2.3 | 
| OM4  | Observation text master file segments (e.g., Lab) |  | added v2.2, removed after v2.3 | 
| OM5  | Observation text master file segments (e.g., Lab) |  | added v2.2, removed after v2.3 | 
| OM6  | Observation text master file segments (e.g., Lab) |  | added v2.2, removed after v2.3 | 
| OMA  | Numerical observation master file |  | added v2.3.1 | 
| OMB  | Categorical observation master file |  | added v2.3.1 | 
| OMC  | Observation batteries master file |  | added v2.3.1 | 
| OMD  | Calculated observations master file |  | added v2.3.1 | 
| OME  | Other Observation/Service Item master file |  | added v2.4 | 
| OMM  | Mixed type observation master file |  | added v2.8.2 | 
| PRA  | Practitioner master file | Ärztekatalog | added v2.2 | 
| STF  | Staff master file | Mitarbeiterkatalog | added v2.2 |