Standard but deprecated (by the source) “zombie” concepts - OHDSI/Vocabulary-v5.0 GitHub Wiki
Obsolete (by the source) concepts are usually represented in OMOP vocabularies as deprecated (invalid_reason = ‘D’) and non-standard (standard_concept = NULL. But there are cases when obsolete concepts that cannot be consistently mapped to Standard equivalents still widely persist in the clinical data tables. Since users may need to query them in their studies , there’s a workaround approach applied in OMOP vocabulary system: the concepts turned into Standard and valid, but with the validity end date defined in the past.
Properties of such concepts look like:
standard_concept = ‘S’,
valid_end_date < 2099-12-31,
invalid_reason IS NULL.
In other words, they are so-called 'zombies', 'dead' but 'resurrected' in terms of validity because of the study needs.
Examples are provided below:
| concept_id | concept_code | concept_name | concept_class_id | standard_concept | valid_end_date | domain_id | vocabulary_id |
| 42740582 | 0006F | Statin therapy, prescribed (Deprecated) | CPT4 | Standard | 2005-01-19 | Procedure | CPT4 |
| 40218366 | C1059 | Autologous cultrured chondrocytes, implantation, carticel | HCPCS | Standard | 2001-06-30 | Procedure | HCPCS |
| 42896034 | 037K0F6 | Dilation of Right Internal Carotid Artery, Bifurcation, with Three Intraluminal Devices, Open Approach (Deprecated) | ICD10PCS | Standard | 2020-09-30 | Procedure | ICD10PCS |
| 2006317 | 84.58 | Implantation of interspinous process decompression device | Procedure | Standard | 2014-09-30 | Procedure | ICD9Proc |
As at the v20220829_major release the number of standard but deprecated (by the source) concepts is following:
| Vocabulary | Count |
| CPT4 | 1862 |
| Gemscript | 7094 |
| HCPCS | 2905 |
| ICD10PCS | 4271 |
| ICD9Proc | 5 |