Diagnosis Code

R99 ILL-DEFINED AND UNKNOWN CAUSE OF MORTALITY


Code Information

Diagnosis Code: R99

Short Description: Ill-defined and unknown cause of mortality

Long Description: Ill-defined and unknown cause of mortality

The code R99 is VALID for claim submission

Code Classification:

  • Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00–R99)
    • Ill-defined and unknown cause of mortality (R99)
      • Ill-defined and unknown cause of mortality (R99)
        • R99 Ill-defined and unknown cause of mortality

Code Version: 2022 ICD-10-CM


Synonyms

  • Accidental death
  • Accidental death
  • Accidental death
  • Accidental death
  • Accidental death
  • Accidental death
  • Accidental death in home
  • Accidental death in industrial place
  • Accidental death in public place
  • Accidentally killed
  • Adverse incident outcome categories
  • Adverse incident resulting in death
  • Anesthetic death
  • Anesthetic death
  • Antepartum maternal death
  • Autopsy pending
  • Autopsy performed
  • Dead
  • Dead - death without witness
  • Dead - expected
  • Dead - sudden death
  • Dead - sudden death
  • Dead - suspicious death
  • Dead - unexpected
  • Dead on arrival at hospital
  • Death
  • Death associated with influenza
  • Death by asphyxiation
  • Death by fire
  • Death by hanging
  • Death by immolation
  • Death due to chemotherapy toxicity
  • Death due to radiotherapy toxicity
  • Death due to trampling
  • Death during anesthetic induction
  • Death from direct obstetric cause occurring more than 42 days but less than one year after delivery
  • Death from indirect obstetric cause occurring more than 42 days but less than one year after delivery
  • Death from overwork
  • Death from sequela of direct obstetric cause
  • Death from sequela of indirect maternal cause
  • Death in home
  • Death in hospice
  • Death in hospital
  • Death in hospital
  • Death in hospital
  • Death in hospital-based emergency department
  • Death in hospital-based emergency department or outpatient department
  • Death in hospital-based outpatient department
  • Death in less than 24 hours from onset of symptoms
  • Death in long term care facility
  • Death in nursing home
  • Death in nursing home or long term care facility
  • Death of unknown cause
  • Death of unknown cause
  • Death unattended by physician
  • Died at home
  • Died during operation
  • Died in ambulance
  • Died in care home
  • Died in community hospital
  • Died in general practice premises
  • Died in hospice
  • Died in hospital
  • Died in hospital
  • Died in hospital
  • Died in learning disability unit
  • Died in mental health unit
  • Died in nursing home
  • Died in street
  • Died in usual place of residence
  • Died without sign of disease
  • Direct maternal death
  • Early neonatal death
  • ECOG performance status - grade 5
  • ECOG performance status finding
  • Found dead
  • Found dead at accident site
  • Found dead in bed
  • GRACILE syndrome
  • Iatrogenic death
  • Iatrogenic death
  • Indirect maternal death
  • Infant death
  • Instantaneous death
  • Intraoperative death
  • Intraoperative or immediately postoperative death in an ASA Class I patient
  • Intrapartum maternal death
  • Killed
  • Late maternal death
  • Late neonatal death
  • Maternal death
  • Maternal death
  • Maternal death
  • Maternal death
  • Maternal death - perinatal
  • Natural death
  • Natural death reportable to medicolegal authority
  • Natural death with probable cause suspected
  • Natural death with proved cause
  • Natural death with proved cause by autopsy
  • Natural death with proved cause without autopsy
  • Natural death with unknown cause
  • Neonatal death of female
  • Neonatal death of female
  • Neonatal death of male
  • Neonatal death of male
  • Newborn death
  • Non-traffic vehicular accidental death
  • Patient death associated with a fall while being cared for in a healthcare facility
  • Patient death or serious disability associated with a burn incurred from any source while being cared for in a healthcare facility
  • Patient death or serious disability associated with an electric shock while being cared for in a healthcare facility
  • Patient death or serious disability associated with patient elopement for more than four hours
  • Patient death or serious disability associated with the use of contaminated drugs, devices, or biologics provided by the healthcare facility
  • Patient death or serious disability associated with the use of restraints or bedrails while being cared for in a healthcare facility
  • Patient death or serious disability associated with the use or function of a device in patient care, in which the device is used or functions other than as intended
  • Patient deceased during stay
  • Patient status determination, deceased
  • Patient status determination, deceased and body cremated
  • Patient status determination, deceased and body donated
  • Patient status determination, deceased and buried
  • Patient status determination, deceased and entombed
  • Patient status determination, deceased and removed from state
  • Perinatal death
  • Perioperative death
  • Postmortem rigidity
  • Postneonatal death
  • Postoperative death
  • Postpartum maternal death
  • Postpartum maternal death
  • Preoperative anesthetic death
  • Serious reportable event associated with environment
  • Serious reportable event associated with environment
  • Serious reportable event associated with environment
  • Serious reportable event associated with environment
  • Serious reportable event associated with patient protection
  • Serious reportable event associated with product or device
  • Serious reportable event associated with product or device
  • Sudden death
  • Sudden death
  • Sudden death of unknown cause during the puerperium
  • Sudden death, cause unknown
  • Sudden death, cause unknown
  • Sudden infant death
  • Sudden infant death syndrome
  • Sudden infant death syndrome
  • Sudden infant death with dysgenesis of testes syndrome
  • Sudden unexpected death in epilepsy
  • Suspicious death
  • Traffic vehicular accidental death
  • Unattended death
  • Unattended death of unknown cause
  • Undetermined manner of death
  • Undetermined manner of death, natural causes suspected
  • Undetermined manner of death, suicide suspected
  • Unexpected death
  • Unexpected sudden death of adult
  • Unexplained sudden death

References to Index of Diseases and Injuries

The code R99 has the following ICD-10-CM references to the Index of Diseases and Injuries
  • Inclusion Terms:
    • Death (unexplained) NOS
    • Unspecified cause of mortality

Crosswalk Information

ICD-10 Code ICD-9 Code ICD-9 Description
R99 Right Arrow 798.0 Sudden infant death synd
799.9 Unkn cause morb/mort NEC

This ICD-10 to ICD-9 data is based on the 2018 General Equivalency Mapping (GEM) files published by the Centers for Medicare & Medicaid Services (CMS) for informational purposes only. The data is not an ICD-10 conversion tool and doesn’t guarantee clinical accuracy.

Similar Codes

ICD-10 Code ICD-10 Description


This page was last updated on: 10/1/2023