S06.303A Unspecified focal traumatic brain injury with loss of consciousness of 1 hour to 5 hours 59 minutes, initial encounter

ICD-10-CM S06.303A: Unspecified Focal Traumatic Brain Injury with Loss of Consciousness of 1 Hour to 5 Hours 59 Minutes, Initial Encounter

ICD-10-CM code S06.303A identifies an initial encounter for an unspecified focal traumatic brain injury with loss of consciousness lasting one hour to five hours and fifty-nine minutes. The concept is active and classified as an injury or poisoning. General clinical sources define traumatic brain injury as brain disruption from external mechanical forces, establishing broader context for this diagnosis. 1 2 3

Plain-language overview

This diagnosis code identifies a specific type of head trauma where a patient experienced a brain injury and was unconscious for a duration between one and just under six hours during their first encounter for the condition. 1 4

What this code represents

The terminology record assigns the semantic type of Injury or Poisoning to S06.303A and confirms the concept is currently active within the ICD-10-CM version 2026 system. 1

S06.303A is a narrower concept derived from the parent code S06.303, which denotes an unspecified focal traumatic brain injury with the same loss of consciousness duration. 1

Clinical context

Clinical references define traumatic brain injury as an alteration in brain function or pathology caused by an external mechanical force, such as impact or rapid acceleration-deceleration. 2 3 6

A joint definition stratifies moderate traumatic brain injury as involving a loss of consciousness greater than thirty minutes and less than twenty-four hours, which encompasses the duration specified by this code. 2

Coding details

The official published abbreviation for this specific diagnosis is Unsp focal TBI w LOC of 1-5 hrs 59 min, init, providing a shortened reference for clinical documentation. 1

Documentation considerations

Clinical evaluations of traumatic brain injury note that documenting the mechanism of injury and the exact duration of loss of consciousness are essential components of the initial assessment. 3

Coverage and utilization context

A Medicare billing and coding article for speech-language pathology includes S06.303A within a designated Group 2 list, and a separate state public health document lists it as a head injury code. 4 5

What the sources add

While the terminology source provides the exact code hierarchy and label, the clinical sources provide the operational definition of traumatic brain injury, and the Medicare article lists the code within a specific group. 1 3 5

Sources

1. ICD-10-CM S06.303A terminology record — National Cancer Institute Enterprise Vocabulary Services; accessed 2026-07-27.
2. DoD/VA CODE PROPOSAL FINAL—508 COMPLIANT — cdc.gov; accessed 2026-07-27.
3. Bookshelf — ncbi.nlm.nih.gov; accessed 2026-07-27.
4. Head and Spinal Cord ICD-10 Inclusion Codes — dph.illinois.gov; accessed 2026-07-27.
5. Article - Billing and Coding: Speech-Language Pathology (A57040) — cms.gov; accessed 2026-07-27.
6. Traumatic Brain Injury Protocol Version 4.0 — neurocriticalcare.org; accessed 2026-07-27.