Background. The transition in 2015 to the Tenth Revision of the International Classification of Disease, Clinical Modification (ICD-10-CM) in the USA led public health professionals to propose a surveillance definition of traumatic brain injury (TBI) that uses ICD-10-CM codes. The proposed definition excludes “unspecified injury of the head,” previously included in the ICD-9-CM TBI definition. The purpose of this study was to evaluate this change in surveillance methods on monthly rates of TBI-related emergency department visits in Colorado from 2012 to 2017.
Results. The monthly rate of TBI-related emergency department visits in the transition month to ICD-10-CM (October 2015) decreased 41 visits per 100,000 population (p-value <0.0001), compared to September 2015, and remained low through December 2017, due to the exclusion of “unspecified injury of head” (ICD-10-CM code S09.90) in the proposed TBI definition.
Conclusion. This study highlights a challenge in creating a standardized set of TBI ICD-10-CM codes for public health surveillance that provides comparable yet clinically relevant estimates over time. The findings inform estimation of TBI magnitude based on ICD coded data and decisions about allocating TBI resources based on an estimated TBI magnitude.

Figure 1
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Posted 29 Dec, 2020
On 10 Jan, 2021
Received 05 Jan, 2021
Received 05 Jan, 2021
Received 05 Jan, 2021
Received 05 Jan, 2021
On 03 Jan, 2021
On 03 Jan, 2021
On 03 Jan, 2021
Received 03 Jan, 2021
On 02 Jan, 2021
On 01 Jan, 2021
On 01 Jan, 2021
Invitations sent on 01 Jan, 2021
On 01 Jan, 2021
On 01 Jan, 2021
On 27 Dec, 2020
On 21 Dec, 2020
Posted 29 Dec, 2020
On 10 Jan, 2021
Received 05 Jan, 2021
Received 05 Jan, 2021
Received 05 Jan, 2021
Received 05 Jan, 2021
On 03 Jan, 2021
On 03 Jan, 2021
On 03 Jan, 2021
Received 03 Jan, 2021
On 02 Jan, 2021
On 01 Jan, 2021
On 01 Jan, 2021
Invitations sent on 01 Jan, 2021
On 01 Jan, 2021
On 01 Jan, 2021
On 27 Dec, 2020
On 21 Dec, 2020
Background. The transition in 2015 to the Tenth Revision of the International Classification of Disease, Clinical Modification (ICD-10-CM) in the USA led public health professionals to propose a surveillance definition of traumatic brain injury (TBI) that uses ICD-10-CM codes. The proposed definition excludes “unspecified injury of the head,” previously included in the ICD-9-CM TBI definition. The purpose of this study was to evaluate this change in surveillance methods on monthly rates of TBI-related emergency department visits in Colorado from 2012 to 2017.
Results. The monthly rate of TBI-related emergency department visits in the transition month to ICD-10-CM (October 2015) decreased 41 visits per 100,000 population (p-value <0.0001), compared to September 2015, and remained low through December 2017, due to the exclusion of “unspecified injury of head” (ICD-10-CM code S09.90) in the proposed TBI definition.
Conclusion. This study highlights a challenge in creating a standardized set of TBI ICD-10-CM codes for public health surveillance that provides comparable yet clinically relevant estimates over time. The findings inform estimation of TBI magnitude based on ICD coded data and decisions about allocating TBI resources based on an estimated TBI magnitude.

Figure 1
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