2026
ICD-10-CM
Diagnosis
Code

R99 Ill-defined and unknown cause of mortality

  • Billable
  • 2016–2026

R99 is a billable/specific diagnosis code from the 2026 ICD-10-CM used to classify the following condition: Ill-defined and unknown cause of mortality.

Inclusion term

  • Death (unexplained) NOS

  • Unspecified cause of mortality

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