Transition to the ICD-10 in the United States An Emerging Data Chasm

JAMA Network June 4, 2018
Rohan Khera, MD; Karen B. Dorsey, MD, PhD; Harlan M. Krumholz, MD, SM

In 2009, the US government mandated that all health care institutions and practitioners covered by the Health Insurance Portability and Accountability Act must transition to a new set of codes for transmitting information about patients’ conditions and treatments using the International Statistical Classification of Diseases and Related Health Problems, Tenth Revision (ICD-10). The transition, which was delayed twice, to these codes from the International Classification of Diseases, Ninth Revision (ICD-9) took effect in October 2015.¹ Data from health care encounters coded as ICD-10 are just now becoming available and this change to the ICD-10 has rendered ICD-coded data more challenging to interpret and use.

Hospitals use ICD-coded data to track and characterize patients, record treatments, monitor outcomes, and seek financial...

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