X78.8XXA Intentional self-harm by other sharp object, initial encounter

ICD-10-CM Code X78.8XXA: Intentional self-harm by other sharp object, initial encounter

ICD-10-CM code X78.8XXA identifies an initial encounter for intentional self-harm caused by an other sharp object. This code captures both the mechanism of injury and the first treatment visit for the injury episode. It is used within administrative billing and surveillance frameworks to track intentional self-harm incidents, distinct from subsequent care or complications. 3 4

Plain-language overview

Code X78.8XXA represents a clinical presentation where a patient intentionally injures themselves with a sharp implement that is not specifically classified elsewhere, and the current encounter is the initial treatment for this injury. 4

What this code represents

The code X78.8XXA indicates both the injury mechanism, which is an other sharp object, and the episode of care, denoted by the seventh character A for an initial encounter. 4

Code X78.8XXA is listed among ICD-10-CM codes for reportable suicide attempts and intentional self-harm, appearing alongside related codes such as X78.0XXA for sharp glass and X78.9XXA for unspecified sharp objects. 3

Coding details

Code X78.8XXA is assigned when documentation explicitly records intentional self-harm with an unspecified or other sharp implement, but it is not assigned for follow-up visits or complications related to a prior self-inflicted sharp-object injury. 4

Documentation considerations

Medical records may contain X78.8XXA in a dedicated external cause field alongside a first-listed diagnosis code, relying on attending physician notes and clinical documentation to confirm the intentional self-harm. 1

Assigning X78.8XXA is supported when a behavioral health consult or clinical record documents intentional self-harm by an other sharp object and includes primary treatment during the same initial visit. 4

What the sources add

While a clinical reference outlines specific clinical scenarios for assigning X78.8XXA, public health surveillance literature establishes that ICD-10-CM codes for intentional self-harm are used for injury surveillance in emergency department billing records. 2 4

Surveillance studies evaluate the positive predictive value of ICD-10-CM intentional self-harm codes by comparing billing data against retrospective medical record reviews for physician-documented intentional self-harm. 2

Questions to verify

The supplied sources do not establish whether X78.8XXA is a billable code or define its exact category hierarchy within the ICD-10-CM tabular list. 3 4

Sources

1. An emergency department medical record review for adolescent intentional self-harm injuries — pmc.ncbi.nlm.nih.gov; accessed 2026-07-25.
2. Multi-site medical record review for validation of intentional self-harm coding in emergency departments — pmc.ncbi.nlm.nih.gov; accessed 2026-07-25.
3. ICD 10 codes for Reportable Suicide Attempt and ... — hhs.nd.gov; accessed 2026-07-25.
4. ICD-10 Code for Intentional self-harm by other sharp object, — combinehealth.ai; accessed 2026-07-25.