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ICD9CM is a coding system in the USA, which is based on the WHO ICD9 coding system, but contains multiple additions and modifications.
The procedures for transforming Concepts from the source to the OMOP Standard Vocabularies can be found here.
All Concepts are assigned the longest of all available names.
All ICD9CM codes are represented in the format containing the dot.
All ICD9CM codes are non-Standard.
ICD9CM Concept Classes identify each Concept as part of the general coding scheme of diagnoses and disorders, the codes for health status and contact with health services (V codes, starting with the letter “V”) and those for external causes of injury (E codes, starting with the letter “E”). In addition, the Concept Classes distinguish between billing and non-billing codes. These are defined according to the Health Care Services Coding System of the Centers of Medicare and Medicaid Services (CMS). Billing codes are those that are used for reimbursement of services, while non-billing codes are Chapter, Category or Sub Category codes.
Please refer to Concepts of ICD-9-CM for details of the composition of this vocabulary.
Concept Class | Notes |
---|---|
3-dig billing V code | |
3-dig billing code | |
3-dig nonbill V code | |
3-dig nonbill code | |
4-dig billing E code | There are no 3-digit E codes |
4-dig billing V code | |
4-dig billing code | |
4-dig nonbill E code | |
4-dig nonbill V code | |
4-dig nonbill code | |
5-dig billing E code | There are no 5-digit codes that are non-billing |
5-dig billing V code | |
5-dig billing code | |
ICD9CM V code | Legacy class of deprecated Concepts |
ICD9CM code | Legacy class of deprecated Concepts |
For each ICD9CM Concept, the Domain is inferred from the SNOMED Concept it is mapped to. If it is mapped to more than one concept, a combination Domain is assigned.
Domain | Active | Deprecated | Description |
---|---|---|---|
Condition | Bulk of ICD9CM codes | ||
Observation | 2606 | 579 | |
Procedure | 330 | 314 | |
Measurement | 201 | 13 | |
Meas/Procedure | 0 | 22 | Deprecated codes |
Condition/Meas | 0 | 33 | Deprecated codes |
Condition/Procedure | 0 | 19 | Deprecated codes |
There are two types of relationships:
ICD9CM Concepts are not Standard Concepts and therefore do not participate in the Hierarchy of the OMOP Standardized Vocabularies.