Hematuria (R31)
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.
Instructional Notations
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.
- hematuria included with underlying conditions, such as:
- acute cystitis with hematuria N30.01
- recurrent and persistent hematuria in glomerular diseases N02
Clinical Terms
The following clinical terms provide additional context, helping users better understand the clinical background and common associations for each diagnosis listed in this section. Including related terms alongside ICD-10-CM codes supports coders, billers, and healthcare professionals in improving accuracy, enhancing documentation, and facilitating research or patient education.
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.
