| Code | Display | status | deprecated | v2-concComment | v2-concCommentAsPub | status | deprecated | v2-concComment | v2-concCommentAsPub | Comments |
|---|
 OM1 | Observation text master file segments (e.g., Lab) | A | A | 2.9 | 2.9 | | | A | A | 2.9 | 2.9 | | | |
| OM2 | Observation text master file segments (e.g., Lab) | A | A | 2.9 | 2.9 | | | A | A | 2.9 | 2.9 | | | |
| OM3 | Observation text master file segments (e.g., Lab) | A | A | 2.9 | 2.9 | | | A | A | 2.9 | 2.9 | | | |
| OM4 | Observation text master file segments (e.g., Lab) | A | A | 2.9 | 2.9 | | | A | A | 2.9 | 2.9 | | | |
| OM5 | Observation text master file segments (e.g., Lab) | A | A | 2.9 | 2.9 | | | A | A | 2.9 | 2.9 | | | |
| OM6 | Observation text master file segments (e.g., Lab) | A | A | 2.9 | 2.9 | | | A | A | 2.9 | 2.9 | | | |
| CM0 | Clinical study master | A | A | 2.9 | 2.9 | | | A | A | 2.9 | 2.9 | | | |
| CM1 | Clinical study phase master | A | A | 2.9 | 2.9 | | | A | A | 2.9 | 2.9 | | | |
| CM2 | Clinical study Data Schedule Master | A | A | 2.9 | 2.9 | | | A | A | 2.9 | 2.9 | | | |
| OM1-OM6 | Observation text master file segments (e.g., Lab) | D | D | 2.9 | 2.9 | | | D | D | 2.9 | 2.9 | | | |
| CDM | Charge description master file | A | A | | | | A | A | | | | |
| CMA | Clinical study with phases and scheduled master file | A | A | | | | A | A | | | | |
| CMB | Clinical study without phases but with scheduled master file | A | A | | | | A | A | | | | |
| LOC | Location master file | A | A | | | | A | A | | | | |
| OMA | Numerical observation master file | A | A | | | | A | A | | | | |
| OMB | Categorical observation master file | A | A | | | | A | A | | | | |
| OMC | Observation batteries master file | A | A | | | | A | A | | | | |
| OMD | Calculated observations master file | A | A | | | | A | A | | | | |
| OMM | Mixed type observation master file | A | A | | | | A | A | | | | |
| PRA | Practitioner master file | A | A | | | | A | A | | | | |
| STF | Staff master file | A | A | | | | A | A | | | | |
| CLN | Clinic master file | A | A | | | | A | A | | | | |
| OME | Other Observation/Service Item master file | A | A | | | | A | A | | | | |
| INV | Inventory master file | A | A | | | | A | A | | | | |
| MLCP | Medicare Limited Coverage Process | A | A | | This identifies Universal Service Identifiers that are not approved for a CPT code based on an ICD. | This identifies Universal Service Identifiers that are not approved for a CPT code based on an ICD. | This identifies Universal Service Identifiers that are not approved for a CPT code based on an ICD. | This identifies Universal Service Identifiers that are not approved for a CPT code based on an ICD. | A | A | | This identifies Universal Service Identifiers that are not approved for a CPT code based on an ICD. | This identifies Universal Service Identifiers that are not approved for a CPT code based on an ICD. | This identifies Universal Service Identifiers that are not approved for a CPT code based on an ICD. | This identifies Universal Service Identifiers that are not approved for a CPT code based on an ICD. | |
| MACP | Medicare Approved Coverage Process | A | A | | This identifies Universal Service Identifier that are approved for an ICD based on the CPT. | This identifies Universal Service Identifier that are approved for an ICD based on the CPT. | This identifies Universal Service Identifier that are approved for an ICD based on the CPT. | This identifies Universal Service Identifier that are approved for an ICD based on the CPT. | A | A | | This identifies Universal Service Identifier that are approved for an ICD based on the CPT. | This identifies Universal Service Identifier that are approved for an ICD based on the CPT. | This identifies Universal Service Identifier that are approved for an ICD based on the CPT. | This identifies Universal Service Identifier that are approved for an ICD based on the CPT. | |