Overview: Patients' diagnoses are documented in the electronic medical records using the International Classification of Diseases (ICD) standardized coding systems. Diagnosis codes are associated with a patient’s encounter with the hospital system. i2b2 has three distinct variable groups for diagnoses:
Sensitive diagnoses, such as mental health disorders and HIV status, cannot be queried in i2b2. Your query will result in 0 patients if sensitive diagnoses are included in the query.
ACT Diagnoses ICD-9-CM
Description: Diagnoses based on the International Classification of Diseases, Ninth Revision, Clinical Modification (ICD-9-CM)
Dates: ICD-9 codes were used at Keck Medicine care sites up until October 2015. After this date, we transitioned to using the ICD-10 coding system. Keep this in mind when running queries. If you would like to search for patients that received a particular diagnosis after October 2015, you must include the corresponding ICD-10 code in your query.
For more information, visit the following page: https://www.cdc.gov/nchs/icd/icd9cm.htm
ACT Diagnoses ICD-10
Description: Diagnoses based on the International Classification of Diseases, Tenth Revision (ICD-10)
Dates: October 2015 to present. Prior to October 2015, Keck Medicine care sites used the ICD-9 coding system. Keep this in mind when you are running queries. If you would like to search for patients that received a particular diagnosis prior to October 2015, you must include the corresponding ICD-9 code in your query.
For more information, visit the following page: https://www.cdc.gov/nchs/icd/icd-10-cm.htm
ACT Diagnoses ICD10-ICD9
Description: ICD-9 and ICD-10 codes have been mapped to each other in this combined hierarchy for diagnoses. Adding a single diagnosis variable from this group will automatically query both ICD-9 and ICD-10 codes for the diagnosis.
Dates: 2009 to present