Hematuria (R31) ICD-10-CM
The R31 code range covers hematuria with 7 ICD-10-CM diagnosis codes. 5 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.
Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
Codes in the R31 Range 7 codes · 5 billable
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the R31 range.
Hematuria
Presence of blood in the urine.
Nephritis, Hereditary
A group of inherited conditions characterized initially by HEMATURIA and slowly progressing to RENAL INSUFFICIENCY. The most common form is the Alport syndrome (hereditary nephritis with HEARING LOSS) which is caused by mutations in genes for TYPE IV COLLAGEN and defective GLOMERULAR BASEMENT MEMBRANE.
About the R31 Code Range
ICD-10 code section R31 covers various types of hematuria, which is the medical term for blood in the urine. These codes are used to specify whether the hematuria is visible or only detectable microscopically, and whether it has additional characteristics or causes.
The main code R31 identifies hematuria generally, while R31.0 specifies gross hematuria, also known as frank hematuria or clot hematuria, where blood or clots are plainly seen in urine. For cases where blood is detected only under a microscope, codes like R31.1 for benign essential microscopic hematuria (sometimes called benign hematuria) and R31.2 for other microscopic hematuria are used. Subcategories such as R31.21 refer to asymptomatic microscopic hematuria, and R31.29 captures intermittent or persistent microscopic hematuria. When the type or cause of blood in urine is unclear or unspecified, R31.9 is the code that applies. Medical coders rely on these distinctions in the ICD-10 code for hematuria to accurately capture clinical details for diagnosis and treatment documentation.
Questions About This Page
How many billable codes are in the R31 range?
Of the 7 codes in this range, 5 are billable and valid for claim submission from October 1, 2025 through September 30, 2026. Category header codes group them but cannot be reported on claims.
What does the R31 range classify?
The range classifies hematuria. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
