Specific code icon 2014 ICD-10-CM Diagnosis Code R99

Ill-defined and unknown cause of mortality

  • R99 is a billable ICD-10-CM code that can be used to specify a diagnosis.
  • On October 1, 2015 ICD-10-CM will replace ICD-9-CM in the United States, therefore, R99 and all other ICD-10-CM codes should only be used for training or planning purposes until then.
Applicable To
  • Death (unexplained) NOS
  • Unspecified cause of mortality
Mortality Data
  • Between 1999-2007 there were 128,828 deaths in the United States where ICD-10 R99 was indicated as the underlying cause of death [source: cdc.govlink to cdc.gov]
  • ICD-10 R99 as underlying cause of death data broken down by: gender, age, race, year
ICD-10-CM R99 is grouped within Diagnostic Related Group (MS-DRG v30.0):
  • 951 Other factors influencing health status
Convert ICD-10-CM R99 to ICD-9-CM
The following ICD-10-CM Index entries contain back-references to ICD-10-CM R99:
  • Cot death R99
  • Crib death R99
  • Death (cause unknown) (of) (unexplained) (unspecified cause) R99
  • Syndrome - see also Disease
  • crib death R99