ICD-10-CM R31.9: Hematuria, unspecified

Quick facts

Code: R31.9
Short title: hematuria, unspecified
Use when: Blood in urine is present/identified, but the type/cause isn’t specified in the documentation yet.
Important ICD-10 “Excludes1” reminders: Don’t use R31.9 when hematuria is included with an underlying condition like acute cystitis with hematuria (N30.01) or recurrent/persistent hematuria in glomerular diseases (N02.-).
Update when clarified: If later workup identifies a specific etiology (stone, UTI, malignancy, etc.), update to the most specific diagnosis instead of leaving R31.9.

Short description (what R31.9 means)

R31.9 reports hematuria (blood in the urine) when the documentation does not specify gross vs microscopic and does not identify a cause.

Full description (how to use it correctly)

R31.9 is an ICD-10-CM symptom code used when hematuria is noted and the underlying cause is not yet determined or not documented, commonly during initial evaluation or while diagnostic workup is pending.
Because it is unspecified, it is best used as a temporary/problem-list diagnosis and should be replaced by a more specific hematuria code or the confirmed underlying condition when available.

Use R31.9 when documentation supports:

“Hematuria” is documented without specifying gross vs microscopic.
Hematuria is found incidentally or on initial UA and the provider documents that the etiology is unknown/pending workup.

Avoid R31.9 when you can code more specifically:

If the provider documents gross vs microscopic hematuria or a specific condition that includes hematuria, code the more specific diagnosis instead.

HCC / RAF (risk adjustment)

R31.9 is generally not a risk-adjusting diagnosis in CMS-HCC models because HCCs are designed around conditions that predict cost (typically chronic/serious diseases), not isolated symptom codes.
For risk adjustment accuracy, ensure the provider documents and you code the underlying condition when known (e.g., bladder cancer, CKD, diabetes, etc.), since those diagnoses—not the symptom of hematuria—are what typically drive HCC/RAF.

Documentation template (copy/paste)

Problem/Assessment line (examples)

R31.9 Hematuria, unspecified — etiology unclear; differential includes infection, stone, malignancy, renal disease; workup initiated.
R31.9 Hematuria, unspecified — discovered on UA; further evaluation planned; will update diagnosis when cause identified.

Minimum documentation elements to support R31.9

History

Onset/duration; visible blood vs “dip positive” vs microscopic only (if not specified, document that it’s not yet characterized).
Associated symptoms: dysuria, frequency/urgency, flank pain, fever, clots, urinary retention.
Risk factors: smoking history, occupational exposures, anticoagulation, prior stones, prior UTIs, prior urothelial cancer, pelvic radiation.

Objective

UA findings (dip blood, microscopy if done), vitals, abdominal/CVA tenderness, GU exam if applicable.

Assessment

State hematuria is present and unspecified (gross vs micro not determined or not documented), and that workup is pending.

Plan (examples—choose what’s appropriate)

Repeat UA with microscopy when clinically appropriate (lab choices vary by setting).
Urine culture if infection suspected (commonly CPT 87086 for urine culture colony count).
Imaging selection based on scenario/risk; CT urography is commonly used in hematuria evaluation and is often referenced with CPT 74178 in CT urography contexts.
cystoscopy referral/plan when appropriate; diagnostic cystoscopy is commonly coded as CPT 52000.
If malignancy concern: consider urine cytology (labs commonly list CPT 88112 for urine cytology).
Update diagnosis once cause is identified (e.g., stone, cystitis with hematuria, malignancy) rather than leaving R31.9 indefinitely.

Sample code pairs (common, not exhaustive)

R31.9 Hematuria, unspecified
Reminder: If hematuria is part of acute cystitis with hematuria, use N30.01 instead of R31.9.
Reminder: If hematuria is in the context of certain glomerular disease hematuria categories, R31.9 may be excluded by the tabular rules (see N02.- exclusion).

CPT (frequently paired in real workflows; payer rules apply)

81001 Urinalysis with microscopy (commonly listed by labs/test directories as CPT 81001).
87086 Urine culture, quantitative colony count (commonly used when UTI is suspected).
52000 Diagnostic cystourethroscopy (cystoscopy).
74178 CT urography-context CT abdomen/pelvis with and without contrast (commonly referenced for CTU evaluation).
88112 Urine cytology (commonly listed CPT for urine cytology).
88120 UroVysion®/FISH type testing in hematuria/bladder cancer evaluation contexts (lab listing example).

Payer/audit tips (practical)

R31.9 is fine for initial presentation, but watch for downstream specificity—if the chart later states stone/UTI/cancer, update the ICD-10 accordingly.
Don’t use R31.9 when the tabular Excludes1 conditions apply (e.g., N30.01; N02.-).
If the clinician documents gross vs microscopic hematuria, encourage coding to the most specific option instead of “unspecified.”

From NotebookLM:

Here is a detailed guide note for R31.9, formatted as clean text for your reference.

R31.9: Hematuria, unspecified

Description

Definition: The presence of red blood cells in the urine where the specific type (gross vs. microscopic) is not documented in the medical record.
Clinical Context: This is a nonspecific symptom code used when the provider states “hematuria” or “blood in urine” without clarifying if it is visible to the naked eye (gross) or only seen under a microscope (microscopic).
Includes: Hematuria NOS (Not Otherwise Specified).

Risk Adjustment (HCC) Status

HCC Weight: No.
Clinical Note: Signs and symptoms (Chapter 18 codes, R00-R99) generally do not map to a Hierarchical Condition Category (HCC) for risk adjustment. They indicate a diagnosis has not yet been established.
Better Specificity: If the workup reveals a malignancy (e.g., C67.9 Bladder Cancer) or a significant chronic condition, those confirmed diagnoses will likely carry HCC weight.

Coding Guidelines & Exclusions

The “Combination Code” Rule: Do not report R31.9 if the patient has a confirmed condition that includes hematuria in its definition.
- Example: Acute cystitis with hematuria is coded as N30.01. You do not bill R31.9 separately.
Specificity Override: If the documentation specifies the type of hematuria, use the more specific code:
- R31.0: Gross hematuria (Visible).
- R31.1: Benign essential microscopic hematuria.
- R31.21: Asymptomatic microscopic hematuria.
- R31.29: Other microscopic hematuria.
Sequencing: If the hematuria is the reason for the encounter (e.g., “Patient presents for evaluation of gross hematuria”), and no definitive diagnosis is found, R31.9 (or the specific R31.- code) is the primary diagnosis.

Common Associated CPT Codes

1. Diagnostic Procedures

52000: cystourethroscopy (Cystoscopy), diagnostic.
- Usage: This is the gold standard workup for hematuria to rule out bladder tumors or stones.
- Billing Note: If performed in the office, you generally cannot bill an E/M code on the same day unless a significant, separately identifiable service is documented (Modifier 25).

2. Laboratory

81002 / 81003: Urinalysis, non-automated or automated, without microscopy.
- Bundling Alert: NCCI edits often bundle 81002 into E/M services unless Modifier 25 is applied to the E/M code.
88121: Urine FISH (fluorescence in situ hybridization) for bladder cancer screening (e.g., UroVysion).

3. Imaging

76770: Ultrasound, retroperitoneal (kidneys, aorta, nodes), complete.
74176 / 74177: CT Abdomen/Pelvis (often used for “CT Urogram” protocols to check for upper tract malignancy).

Documentation Checklist

Type: Did the provider state “Gross” (Visible) or “Microscopic”? If so, avoid R31.9 and use R31.0 or R31.2-.
Etiology: Is the cause confirmed (e.g., UTI, Stone, Cancer)? Code the condition, not the symptom, unless the symptom implies additional care not covered by the disease code.
Associated Symptoms: Document dysuria (R30.0) or pain to support medical necessity for further testing.

Explorer

R31.9