Ill-defined and unknown cause of mortality R99

  • R99 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • The 2019 edition of ICD-10-CM R99 became effective on October 1, 2018.
  • This is the American ICD-10-CM version of R99 - other international versions of ICD-10 R99 may differ.
Applicable To:
  • Death (unexplained) NOS
  • Unspecified cause of mortality

Codes: = Billable

  • R99 Ill-defined and unknown cause of mortality

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.