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R31.0 — Gross hematuria
R31.0
What this code means
Gross haematuria is blood in the urine that is visible to the naked eye.
Also called: gross hematuria, visible blood in urine.
When this code is used
Used for gross haematuria.
Where it sits in ICD-10-CM
Code R31.0 belongs to Chapter 18: Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified, which covers codes R00–R99 in the FY2027 ICD-10-CM tabular list. The official description above is copied verbatim from the CDC/NCHS FY2027 code file.
Related symptoms
Frequently asked questions
What is ICD-10-CM code R31.0?
R31.0 is the ICD-10-CM diagnosis code for “Gross hematuria”. Gross haematuria is blood in the urine that is visible to the naked eye.
When is code R31.0 used?
Used for gross haematuria. It belongs to Chapter 18 of ICD-10-CM (Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified).
This guide explains ICD-10-CM codes in plain language for patients, students and other readers. It is educational information only — not coding, billing or medical advice. The code recorded for any real encounter is assigned from the full clinical documentation by the treating team and qualified coders, and only they can decide which code fits a specific case.