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R31.21 ICD-10-CM Code: Asymptomatic microscopic hematuria

Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.

Inpatient Payment Groups (MS-DRG)

MS-DRGs this diagnosis helps define, as principal or secondary, per the CMS ICD-10-CM/PCS MS-DRG Definitions Manual v43.0, Appendix B.

  • MS-DRG 695 — KIDNEY AND URINARY TRACT SIGNS AND SYMPTOMS WITH MCC (MDC 11)
  • MS-DRG 696 — KIDNEY AND URINARY TRACT SIGNS AND SYMPTOMS WITHOUT MCC (MDC 11)
  • MS-DRG 791 — PREMATURITY WITH MAJOR PROBLEMS (MDC 15)
  • MS-DRG 793 — FULL TERM NEONATE WITH MAJOR PROBLEMS (MDC 15)

A diagnosis appearing in a group's logic does not by itself determine the DRG assigned to a stay; the grouper uses the full claim.

Official Registry Overview & Definition

Asymptomatic microscopic hematuria is a billable ICD-10-CM diagnosis code (R31.21).

Official Tabular Instructional Notes

Sequencing, inclusion, and exclusion notes published for R31.21 in the official ICD-10-CM tabular list.

Inclusion Terms

Alternative terms the tabular list files under this code.

  • AMH

Excludes1 — Not Coded Here

Conditions generally not reported together with this code (Excludes1) -- an error unless the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).

Indexed Clinical Terms (2)

Clinical term phrases from the official ICD-10-CM Index to Diseases and Injuries that map to this code.

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

Frequently Compared Codes

The official Excludes notes on R31.21 name these codes. Each comparison page covers when the two can — or must not — be reported together.

Change history

  • FY2017 — 2016-10-01
    Added to the code set
    Asymptomatic microscopic hematuria
    FY2017 changes

Verify Before Coding

  • No Medicare Code Editor or MS-DRG Definitions Manual restrictions apply to this code.

From the code registry, the Medicare Code Editor, and the MS-DRG Definitions Manual. Check it against a full claim.

Relationships & Classification

Official ICD-10-CM tabular notes on other codes that name R31.21 or its code family.

2 Excludes1 notes: N02 (via R31.-), N42.1 (via R31.-).

2 Excludes2 notes across 2 chapters: N39 (via R31.-), R82 (via R31.-).

Potential MS-DRG Relationships (FY2026)

Not on the CMS CC/MCC list — as a secondary diagnosis this code does not change MS-DRG severity.

Named in the grouper logic of 4 MS-DRGs: DRG 695 (MDC 11), DRG 696 (MDC 11), DRG 791 (MDC 15), DRG 793 (MDC 15).

From the CMS MS-DRG Definitions Manual (Appendices B and C). Actual DRG assignment depends on the complete claim.

Clinical classification (AHRQ CCSR):GEN009 — Hematuria (default).

Clinical Classifications Software Refined (CCSR) for ICD-10-CM Diagnoses. Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality.

Contextual Map

Every relationship of R31.21 in one view: hierarchy, official tabular instructions in both directions, clinical classification, risk adjustment, MS-DRG participation, index terms and change history — each edge carrying the CMS source it derives from.

Hierarchy

  • R00-R99 — Chapter 18: Symptoms, Signs and Abnormal Clinical and Laboratory Findings, Not Elsewhere Classified (R00-R99) (R00-R99) [Hierarchy]
  • R30-R39 — Symptoms and signs involving the genitourinary system [Hierarchy]

Referenced by Excludes1 notes

  • N02 — Recurrent and persistent hematuria [Excludes1](via R31.-): “hematuria not associated with specified morphologic lesions (R31.-)” · check together
  • N42.1 — Congestion and hemorrhage of prostate [Excludes1](via R31.-): “hematuria (R31.-)” · check together

Referenced by Excludes2 notes

  • N39 — Other disorders of urinary system [Excludes2](via R31.-): “hematuria NOS (R31.-)” · check together
  • R82 — Other and unspecified abnormal findings in urine [Excludes2](via R31.-): “hematuria (R31.-)” · check together

Clinical classification (CCSR)

Potential MS-DRG

  • DRG 695 — KIDNEY AND URINARY TRACT SIGNS AND SYMPTOMS WITH MCC [MS-DRG]: “KIDNEY AND URINARY TRACT SIGNS AND SYMPTOMS WITH MCC (MDC 11)”
  • DRG 696 — KIDNEY AND URINARY TRACT SIGNS AND SYMPTOMS WITHOUT MCC [MS-DRG]: “KIDNEY AND URINARY TRACT SIGNS AND SYMPTOMS WITHOUT MCC (MDC 11)”
  • DRG 791 — PREMATURITY WITH MAJOR PROBLEMS [MS-DRG]: “PREMATURITY WITH MAJOR PROBLEMS (MDC 15)”
  • DRG 793 — FULL TERM NEONATE WITH MAJOR PROBLEMS [MS-DRG]: “FULL TERM NEONATE WITH MAJOR PROBLEMS (MDC 15)”

MDC crossing · procedures (3574)

  • MDC 11 — Diseases and Disorders of the Kidney and Urinary Tract [MDC crossing]: “Diseases and Disorders of the Kidney and Urinary Tract — the grouper's crossing between diagnoses and procedures: a principal diagnosis sets the MDC, and same-MDC procedures move the stay to its surgical DRGs.”
  • MDC 15 — Newborns and Other Neonates with Conditions Originating in Perinatal Period [MDC crossing]: “Newborns and Other Neonates with Conditions Originating in Perinatal Period — the grouper's crossing between diagnoses and procedures: a principal diagnosis sets the MDC, and same-MDC procedures move the stay to its surgical DRGs.”
  • 00HE0MZ — Insertion of Neurostimulator Lead into Cranial Nerve, Open Approach [Same-MDC procedure]: “Insertion of Neurostimulator Lead into Cranial Nerve, Open Approach — grouped in MDC 11, the procedure side of this code's crossing.” · check together
  • 00HE3MZ — Insertion of Neurostimulator Lead into Cranial Nerve, Percutaneous Approach [Same-MDC procedure]: “Insertion of Neurostimulator Lead into Cranial Nerve, Percutaneous Approach — grouped in MDC 11, the procedure side of this code's crossing.” · check together
  • 00HE4MZ — Insertion of Neurostimulator Lead into Cranial Nerve, Percutaneous Endoscopic Approach [Same-MDC procedure]: “Insertion of Neurostimulator Lead into Cranial Nerve, Percutaneous Endoscopic Approach — grouped in MDC 11, the procedure side of this code's crossing.” · check together
  • 00HU0MZ — Insertion of Neurostimulator Lead into Spinal Canal, Open Approach [Same-MDC procedure]: “Insertion of Neurostimulator Lead into Spinal Canal, Open Approach — grouped in MDC 11, the procedure side of this code's crossing.” · check together
  • 00HU3MZ — Insertion of Neurostimulator Lead into Spinal Canal, Percutaneous Approach [Same-MDC procedure]: “Insertion of Neurostimulator Lead into Spinal Canal, Percutaneous Approach — grouped in MDC 11, the procedure side of this code's crossing.” · check together
  • and 3569 more

Index entries

  • AMH (asymptomatic microscopic hematuria)[Index term]
  • Hematuria, microscopic NEC (with symptoms), asymptomatic[Index term]

Nearest codes

  • R31 — Hematuria [Sibling]
  • R31.0 — Gross hematuria [Sibling]
  • R31.1 — Benign essential microscopic hematuria [Sibling]
  • R31.2 — Other microscopic hematuria [Sibling]
  • R31.29 — Other microscopic hematuria [Sibling]
  • R31.9 — Hematuria, unspecified [Sibling]

Change history

  • FY2017 — Added to the code set [Change history]

Nearest Codes in This Family

Official ICD-10-CM classifications closest to R31.21 in its code family, with their registry titles.

  • R31 — Hematuria
  • R31.0 — Gross hematuria
  • R31.1 — Benign essential microscopic hematuria
  • R31.2 — Other microscopic hematuria
  • R31.29 — Other microscopic hematuria
  • R31.9 — Hematuria, unspecified

View all codes in the R31 family