ICD-10-CM · Chapter 18 · R00–R99
R99
Ill-defined and unknown cause of mortality
Symptoms, signs and abnormal clinical and laboratory findings
Quick facts
- Code
- R99
- Type
- Billable code
- ICD-10-CM chapter
- Chapter 18 — Symptoms, signs and abnormal clinical and laboratory findings
- Category
- R99
- Specificity
- 3 characters
How coders use this code
ICD-10-CM R99 is a billable, fully specified code, so it can be reported directly on a claim to document a diagnosis of ill-defined and unknown cause of mortality. Coders assign it when the chart documentation supports this level of detail, always matching to the most specific code available and verifying against the chapter-specific guidelines published annually by NCHS/CMS.
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