Data Source:
We utilized the national readmission database (NRD) from January 2016 to
December 2018 to conduct this study.[11] NRD is the largest publicly
available all-payer inpatient health care readmission database in the
US, containing data from 17 million discharges (unweighted) each year.
When weighted, it provides roughly 36 million discharges, accounting for
58% of the total US population and 57% of all US hospitalizations. The
NRD is part of a family of databases and software tools developed
through a Federal-State-Industry partnership for the Healthcare Cost and
Utilization Project (HCUP). It includes a full calendar year of data
with diagnosis and procedure codes using the International
Classification of Diseases, Tenth Revision, Clinical Modification
Diagnostic, and Procedure Coding System (ICD-10-CM and PCS). Due to
deidentified nature of this database, this study did not require
Institutional Review Board approval.