ICD-10-CM Diagnosis Code (2025)
Official Description for R99
Ill-defined and unknown cause of mortality
Coding Notes & Guidelines for R99
Inclusion Terms
- Death (unexplained) NOS
- Unspecified cause of mortality
About ICD-10-CM Code R99 (Ill-defined and unknown cause of mortality)
ICD-10-CM code R99 is a billable or specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. The 2025 edition of ICD-10-CM R99 became effective on October 1, 2024.
This page provides detailed information about R99 - Ill-defined and unknown cause of mortality. It includes common terminology, coding guidelines such as "Includes," "Excludes1," and "Excludes2" notes, and information on required 7th characters. Utilizing this information correctly is essential for accurate medical coding and claims submission for conditions like Ill-defined and unknown cause of mortality.