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ICD-10-CM Code R99
Ill-defined and unknown cause of mortality

Billable Code
Billable codes are sufficient justification for admission to an acute care hospital when used a principal diagnosis.
| ICD-10 from 2011 - 2016

R99 is a billable ICD code used to specify a diagnosis of ill-defined and unknown cause of mortality. A 'billable code' is detailed enough to be used to specify a medical diagnosis.

Coding Notes for R99 Info for medical coders on how to properly use this ICD-10 code

Inclusion Terms:
Inclusion Terms
Inclusion Terms are a list of concepts for which a specific code is used. The list of Inclusion Terms is useful for determining the correct code in some cases, but the list is not necessarily exhaustive.
Death (unexplained) NOS
Unspecified cause of mortality

MS-DRG Mapping

  • DRG Group #951 - Other factors influencing health status.

ICD-10-CM Alphabetical Index References for 'R99 - Ill-defined and unknown cause of mortality'

The ICD-10-CM Alphabetical Index links the below-listed medical terms to the ICD code R99. Click on any term below to browse the alphabetical index.

Death(cause unknown) (of) (unexplained) (unspecified cause) (R99)
Cot death (R99)
Crib death (R99)


Sudden infant death syndrome (approximate match)
Other unknown and unspecified cause of morbidity and mortality (approximate match)

This is the official approximate match mapping between ICD9 and ICD10, as provided by the General Equivalency mapping crosswalk. This means that while there is no exact mapping between this ICD10 code R99 and a single ICD9 code, 799.9 is an approximate match for comparison and conversion purposes.

** This Document Provided By ICD.Codes **
Source: http://icd.codes/icd10cm/R99