R31.21 – Asymptomatic microscopic hematuria

ICD-10-CM 2027 diagnosis code · Symptoms and signs involving the genitourinary system

Billable code

ICD-10-CM code R31.21
Code
R31.21 (claims format: R3121)
Description
Asymptomatic microscopic hematuria
Billable
Yes – valid for HIPAA-covered transactions
Valid for
Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter
18. Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99)
Block
R30-R39 Symptoms and signs involving the genitourinary system
Parent codes
R31 › R31.2

Notes for R31.21

Applicable to:
  • AMH

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

R31 – Hematuria

Excludes1 (not coded here):
  • hematuria included with underlying conditions, such as:
  • acute cystitis with hematuria (N30.01)
  • recurrent and persistent hematuria in glomerular diseases (N02.-)

Index terms for R31.21

Entries in the ICD-10-CM alphabetic index that lead to this code:

Related codes in R31.2

Frequently asked questions

What is ICD-10 code R31.21?

R31.21 is the ICD-10-CM code for asymptomatic microscopic hematuria, in the block R30-R39 (Symptoms and signs involving the genitourinary system).

Is R31.21 a billable code?

Yes. R31.21 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.

What category does R31.21 belong to?

It belongs to category R31 – Hematuria.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.