All ICD10 Codes

R99

Billable
ChapterR00–R99
Rankcategory
Official Description

Ill-defined and unknown cause of mortality

Metadata & Insights
  • •Billable/specific code (valid for reimbursement).
  • •Chapter 18: Symptoms, Signs and Abnormal Clinical and Laboratory Findings (R00-R99).

CH18 Parent Instructions

Excludes2(Not included here. Code separately if applicable.)
  • abnormal findings on antenatal screening of mother (O28.-)
  • certain conditions originating in the perinatal period (P04-P96)
  • signs and symptoms classified in the body system chapters
  • signs and symptoms of breast (N63, N64.5)

Instructional Notes

Includes
  • Death (unexplained) NOS
  • Unspecified cause of mortality

Clinical Hierarchy

BillableHas subcodes
CH18Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99)
R99Ill-defined and unknown cause of mortalityBillable

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to R99:

chapterCH18
Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99)
View context instructions

MS-DRG Classification

2026 v43.1

This code is grouped within the following Diagnosis Related Group(s) for clinical reimbursement:

DRG 951
Other Factors Influencing Health Status

Cross Reference

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