Standard but deprecated (by the source) “zombie” concepts

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