2026 ICD-10-CM Diagnosis Code Y09Assault by unspecified means

ICD-10-CM CodesV01–Y99X92-Y09Y09

ICD-10-CM Y09
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

Y09 is a billable ICD-10-CM diagnosis code for assault by unspecified means. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under External cause codes: intent of injury, assault; and External cause codes: unspecified mechanism.

Code Identity

ICD-10-CM Code
Y09
Billable Status
Yes — Valid for Submission
Code Describes
Assault by unspecified means
Chapter
X92-Y09
Assault

Code Classification

ChapterV01–Y99External causes of morbidity and mortality
SectionX92-Y09Assault
CategoryY09Assault by unspecified means
This CodeY09Assault by unspecified means

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Assault
  • Assault and battery
  • Assault by person
  • Battery
  • Death due to assault AND battery
  • Death or significant injury of a patient or staff member resulting from a physical assault that occurs within or on the grounds of the healthcare facility
  • Euthanasia
  • Exposure to attack by other person
  • First degree murder
  • Fratricide
  • Gangland style homicide
  • Homicide
  • Homicide and assault by fight, brawl and rape
  • Homicide attempt
  • Homicide by overkill
  • Infanticide
  • Justifiable homicide
  • Killing
  • Late effect due to homicide attempt
  • Late effects of assault
  • Manslaughter
  • Matricide
  • Murder
  • Murder by hired killer
  • Murder of acquaintance
  • Murder of friend
  • Murder of relative
  • Murder of spouse
  • Murder of stranger
  • Non-judicial execution
  • Patricide
  • Second degree murder
  • Serial killing
  • Serious reportable event associated with criminal activity
  • Sororicide
  • Traumatic injury due to assault
  • Undetermined manner of death
  • Undetermined manner of death, homicide suspected
  • Unlawful killing

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Inclusion Terms

  • Assassination (attempted) NOS
  • Homicide (attempted) NOS
  • Manslaughter (attempted) NOS
  • Murder (attempted) NOS

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR EXT022
External cause codes: intent of injury, assault
Default principal diagnosis: inpatient No · outpatient No
CCSR EXT019
External cause codes: unspecified mechanism
Default principal diagnosis: inpatient No · outpatient No

Clinical InformationClinical

  • Homicide

    the killing of one person by another.
  • Euthanasia

    the act or practice of killing or allowing death from natural causes, for reasons of mercy, i.e., in order to release a person from incurable disease, intolerable suffering, or undignified death. (from beauchamp and walters, contemporary issues in bioethics, 5th ed)
  • Euthanasia, Active

    the act or practice of killing for reasons of mercy, i.e., in order to release a person or animal from incurable disease, intolerable suffering, or undignified death. (from beauchamp and walters, contemporary issues in bioethics, 5th ed)
  • Euthanasia, Active, Voluntary

    active euthanasia of a patient at the patient's request and/or with the patient's consent.
  • Euthanasia, Animal

    the killing of animals for reasons of mercy, to control disease transmission or maintain the health of animal populations, or for experimental purposes (animal experimentation).
  • Euthanasia, Involuntary

    the act or practice of killing or withholding life-sustaining treatment from a person with a medical condition, especially persons with disabilities, without informed consent, despite the mental competency of the person to give consent.
  • Euthanasia, Passive

    failing to prevent death from natural causes, for reasons of mercy by the withdrawal or withholding of life-prolonging treatment.
  • Infanticide

    the killing of infants at birth or soon after.
  • Animal Experimentation

    the use of animals as investigational subjects.
  • Sexual Assault Counseling Service Type|Sexual Assault Counselling|Sexual Assault Counselling

    the service type that is associated with the health level 7 fast healthcare interoperability resources sexual assault counselling code.
  • Sexual Assault Service Type|Sexual Assault|Sexual Assault

    the service type that is associated with the health level 7 fast healthcare interoperability resources sexual assault code.
  • Assault

    a physical attack.
  • Assault By Firearm

    a physical attack with a gun.
  • Assault By Sharp Object

    a physical attack with a pointed object.
  • DRRI-2 - A: Witnessed Someone Assaulted|DRRI1-A: Witnessed Someone Assaulted|DRRI1-A: Witnessed Someone Assaulted|DRRI1A10

    deployment risk and resilience inventory-2 (drri-2) before deployment: i witnessed someone being seriously assaulted or killed.
  • DRRI-2 - D: Assault on Entrenched Positions|DRRI1-D: Assault on Entrenched Positions|DRRI1-D: Assault on Entrenched Positions|DRRI1D02

    deployment risk and resilience inventory-2 (drri-2) during deployment: i took part in an assault on entrenched or fortified positions that involved naval and/or land forces.
  • DRRI-2 - N: Witnessed Someone Assaulted|DRRI1-N: Witnessed Someone Assaulted|DRRI1-N: Witnessed Someone Assaulted|DRRI1N07

    deployment risk and resilience inventory-2 (drri-2) since returning: i have witnessed someone being seriously assaulted or killed.
  • Homicide by Assault

    death of an individual by physical violence from another.
  • LEC-5 Standard Version - Assault With a Weapon: Happened|LEC01-Assault With a Weapon: Happened|LEC01-Assault With a Weapon: Happened|LEC0107A

    life events checklist for dsm-5 standard version (lec-5 standard version) assault with a weapon (for example, being shot, stabbed, threatened with a knife, gun, bomb): happened to me.
  • LEC-5 Standard Version - Assault With a Weapon: Job|LEC01-Assault With a Weapon: Job|LEC01-Assault With a Weapon: Job|LEC0107D

    life events checklist for dsm-5 standard version (lec-5 standard version) assault with a weapon (for example, being shot, stabbed, threatened with a knife, gun, bomb): part of my job.
  • LEC-5 Standard Version - Assault With a Weapon: Learned|LEC01-Assault With a Weapon: Learned|LEC01-Assault With a Weapon: Learned|LEC0107C

    life events checklist for dsm-5 standard version (lec-5 standard version) assault with a weapon (for example, being shot, stabbed, threatened with a knife, gun, bomb): learned about it.
  • LEC-5 Standard Version - Assault With a Weapon: Not Apply|LEC01-Assault With a Weapon: Not Apply|LEC01-Assault With a Weapon: Not Apply|LEC0107F

    life events checklist for dsm-5 standard version (lec-5 standard version) assault with a weapon (for example, being shot, stabbed, threatened with a knife, gun, bomb): doesn't apply.
  • LEC-5 Standard Version - Assault With a Weapon: Not Sure|LEC01-Assault With a Weapon: Not Sure|LEC01-Assault With a Weapon: Not Sure|LEC0107E

    life events checklist for dsm-5 standard version (lec-5 standard version) assault with a weapon (for example, being shot, stabbed, threatened with a knife, gun, bomb): not sure.
  • LEC-5 Standard Version - Assault With a Weapon: Witnessed|LEC01-Assault With a Weapon: Witnessed|LEC01-Assault With a Weapon: Witnessed|LEC0107B

    life events checklist for dsm-5 standard version (lec-5 standard version) assault with a weapon (for example, being shot, stabbed, threatened with a knife, gun, bomb): witnessed it.
  • LEC-5 Standard Version - Physical Assault: Happened|LEC01-Physical Assault: Happened|LEC01-Physical Assault: Happened|LEC0106A

    life events checklist for dsm-5 standard version (lec-5 standard version) physical assault (for example, being attacked, hit, slapped, kicked, beaten up): happened to me.
  • LEC-5 Standard Version - Physical Assault: Job|LEC01-Physical Assault: Job|LEC01-Physical Assault: Job|LEC0106D

    life events checklist for dsm-5 standard version (lec-5 standard version) physical assault (for example, being attacked, hit, slapped, kicked, beaten up): part of my job.
  • LEC-5 Standard Version - Physical Assault: Learned|LEC01-Physical Assault: Learned|LEC01-Physical Assault: Learned|LEC0106C

    life events checklist for dsm-5 standard version (lec-5 standard version) physical assault (for example, being attacked, hit, slapped, kicked, beaten up): learned about it.
  • LEC-5 Standard Version - Physical Assault: Not Apply|LEC01-Physical Assault: Not Apply|LEC01-Physical Assault: Not Apply|LEC0106F

    life events checklist for dsm-5 standard version (lec-5 standard version) physical assault (for example, being attacked, hit, slapped, kicked, beaten up): doesn't apply.
  • LEC-5 Standard Version - Physical Assault: Not Sure|LEC01-Physical Assault: Not Sure|LEC01-Physical Assault: Not Sure|LEC0106E

    life events checklist for dsm-5 standard version (lec-5 standard version) physical assault (for example, being attacked, hit, slapped, kicked, beaten up): not sure.
  • LEC-5 Standard Version - Physical Assault: Witnessed|LEC01-Physical Assault: Witnessed|LEC01-Physical Assault: Witnessed|LEC0106B

    life events checklist for dsm-5 standard version (lec-5 standard version) physical assault (for example, being attacked, hit, slapped, kicked, beaten up): witnessed it.
  • LEC-5 Standard Version - Sexual Assault: Happened|LEC01-Sexual Assault: Happened|LEC01-Sexual Assault: Happened|LEC0108A

    life events checklist for dsm-5 standard version (lec-5 standard version) sexual assault (rape, attempted rape, made to perform any type of sexual act through force or threat of harm): happened to me.
  • LEC-5 Standard Version - Sexual Assault: Job|LEC01-Sexual Assault: Job|LEC01-Sexual Assault: Job|LEC0108D

    life events checklist for dsm-5 standard version (lec-5 standard version) sexual assault (rape, attempted rape, made to perform any type of sexual act through force or threat of harm): part of my job.
  • LEC-5 Standard Version - Sexual Assault: Learned|LEC01-Sexual Assault: Learned|LEC01-Sexual Assault: Learned|LEC0108C

    life events checklist for dsm-5 standard version (lec-5 standard version) sexual assault (rape, attempted rape, made to perform any type of sexual act through force or threat of harm): learned about it.
  • LEC-5 Standard Version - Sexual Assault: Not Apply|LEC01-Sexual Assault: Not Apply|LEC01-Sexual Assault: Not Apply|LEC0108F

    life events checklist for dsm-5 standard version (lec-5 standard version) sexual assault (rape, attempted rape, made to perform any type of sexual act through force or threat of harm): doesn't apply.
  • LEC-5 Standard Version - Sexual Assault: Not Sure|LEC01-Sexual Assault: Not Sure|LEC01-Sexual Assault: Not Sure|LEC0108E

    life events checklist for dsm-5 standard version (lec-5 standard version) sexual assault (rape, attempted rape, made to perform any type of sexual act through force or threat of harm): not sure.
  • LEC-5 Standard Version - Sexual Assault: Witnessed|LEC01-Sexual Assault: Witnessed|LEC01-Sexual Assault: Witnessed|LEC0108B

    life events checklist for dsm-5 standard version (lec-5 standard version) sexual assault (rape, attempted rape, made to perform any type of sexual act through force or threat of harm): witnessed it.

Convert Y09 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
E968.9 Assault NOS
Exact Match The mapping is direct, with no qualifiers.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About Y09Overview

Is Y09 (Assault by unspecified means) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report assault by unspecified means on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What is the ICD-9 equivalent of Y09?

Under the General Equivalence Mappings, assault by unspecified means converts to ICD-9-CM E968.9 (assault NOS). The mapping is a direct match.