R31.21 Asymptomatic microscopic hematuria

Billable ICD-10-CM code, FY2026.

Applicable to

• AMH

Applies from R31 Hematuria

Excludes1 (never code together)

• hematuria included with underlying conditions, such as:
• acute cystitis with hematuria (N30.01)
• recurrent and persistent hematuria in glomerular diseases (N02.-)

MS-DRG index

Defines the logic of DRG(s) 695-696 in MDC 11.

Approximate ICD-9-CM (GEMs)

• 599.72 Microscopic hematuria (approximate)

Code annotations containing back-references to R31.21

Back-references to R31

• Type 1 Excludes: N02 Recurrent and persistent hematuria ("hematuria not associated with specified morphologic lesions (R31.-)")
• Type 2 Excludes: N39 Other disorders of urinary system ("hematuria NOS (R31.-)")
• Type 1 Excludes: N42.1 Congestion and hemorrhage of prostate ("hematuria (R31.-)")
• Type 2 Excludes: R82 Other and unspecified abnormal findings in urine ("hematuria (R31.-)")

Diagnosis Index entries for R31.21

• AMH (asymptomatic microscopic hematuria)
• Hematuria › microscopic NEC (with symptoms) › asymptomatic

Nearby codes

• R31 Hematuria
• R31.0 Gross hematuria
• R31.1 Benign essential microscopic hematuria
• R31.2 Other microscopic hematuria
• R31.21 Asymptomatic microscopic hematuria (this code)
• R31.29 Other microscopic hematuria
• R31.9 Hematuria, unspecified