R31.29 - Other Microscopic Hematuria

Short Description

R31.29: Use for microscopic hematuria (blood in urine detected only by laboratory testing, not visible to naked eye) when the patient HAS symptoms (e.g., dysuria, frequency, urgency, flank pain) or when the microscopic hematuria does NOT meet criteria for asymptomatic (R31.21) or benign essential (R31.1) types. This is the “catch-all” code for symptomatic or otherwise non-specified microscopic hematuria.

Full Description & Clinical Context

R31.29 - Other microscopic hematuria describes blood in the urine that is NOT visible to the naked eye but is detected by urinalysis (dipstick or microscopic examination) AND is either:

Accompanied by symptoms (dysuria, frequency, urgency, pain), OR
Not otherwise classified as asymptomatic (R31.21) or benign essential (R31.1)

Key Clinical Features:

Microscopic hematuria - RBCs detected on urinalysis but urine appears normal/clear to the eye
Symptomatic - patient has urinary symptoms (pain, frequency, urgency, etc.)
Requires investigation - not benign, needs workup for underlying cause
Common causes: UTI, stones, tumors, glomerular disease, trauma, anticoagulation, prostatic disease

Distinction from other hematuria codes:

NOT visible (would be R31.0 - gross hematuria)
NOT asymptomatic (would be R31.21 - asymptomatic microscopic hematuria)
NOT benign essential (would be R31.1 - benign essential microscopic hematuria)
This is the “other” category for microscopic hematuria with symptoms or other features

Pathophysiology: RBCs enter urine from anywhere in urinary tract (kidneys, ureters, bladder, urethra, prostate) → detected by dipstick (heme-positive) or microscopy (elevated RBC count) → not visible to eye but clinically significant.

Code Details

Code set: ICD-10-CM
Full code: R31.29
Title: Other microscopic hematuria
Code type: Billable/specific diagnosis code
Clinical category: Hematuria (symptom code)
Parent code: R31.2 (Other microscopic hematuria)
Created: R31.2 was expanded to R31.21 and R31.29 to distinguish asymptomatic from other types

Coding notes from R31:

Excludes 1:
- Hematuria included with underlying conditions, such as:
  - Acute cystitis with hematuria → N30.01
  - Recurrent and persistent hematuria in glomerular diseases → N02.-

R31 Family - Complete Hematuria Code Set

The Complete Hematuria Hierarchy

Code	Description	Type	When Used	Clinical Scenario
R31.0	Gross hematuria	Visible	Blood visible to naked eye (red/pink/tea-colored urine)	Patient sees blood in urine
R31.1	Benign essential microscopic hematuria	Microscopic	Frequent, heavy microscopic hematuria; benign, no serious cause	Chronic benign microhematuria
R31.2	Other microscopic hematuria	Microscopic	Parent code (use R31.21 or R31.29 instead)	DO NOT USE - use child codes
R31.21	Asymptomatic microscopic hematuria	Microscopic	Microscopic hematuria WITHOUT symptoms; incidental finding	NO symptoms, found on routine UA
R31.29	Other microscopic hematuria	Microscopic	Microscopic hematuria WITH symptoms OR not fitting R31.21/R31.1	HAS symptoms OR not classified ← YOU ARE HERE
R31.9	Hematuria, unspecified	Unspecified	Hematuria type not specified (avoid when possible)	Hematuria NOS

Coding Principle:

R31.0 = VISIBLE blood (gross hematuria)
R31.1 = Benign essential microscopic (chronic, benign)
R31.21 = ASYMPTOMATIC microscopic hematuria
R31.29 = SYMPTOMATIC microscopic hematuria (or other type not fitting R31.21/R31.1)
R31.9 = Unspecified (avoid when type is known)

CRITICAL: R31.29 vs R31.21 (The Symptom Question)

Decision Tree: Which Microscopic Hematuria Code?

This is THE most important distinction for microscopic hematuria coding:

Use R31.21 (Asymptomatic) when:

Microscopic hematuria detected on UA
Patient has NO urinary symptoms
Found incidentally (routine physical, pre-op screening, wellness exam)
No dysuria, frequency, urgency, pain, or other symptoms
Asymptomatic microscopic hematuria documented

Example for R31.21:

“Routine physical exam. UA shows 5-10 RBC/hpf. Patient denies any urinary symptoms. Diagnosis: Asymptomatic microscopic hematuria.”

Use R31.29 (Other) when:

Microscopic hematuria detected on UA
Patient HAS urinary symptoms (dysuria, frequency, urgency, pain, etc.)
OR: Microscopic hematuria is symptomatic or requires investigation
OR: Does not fit criteria for R31.21 (asymptomatic) or R31.1 (benign essential)

Example for R31.29:

“Patient presents with dysuria and suprapubic pain. UA shows 10-20 RBC/hpf, 50-100 WBC/hpf, bacteria present. Diagnosis: UTI with microscopic hematuria.”

When to Use R31.29

Use R31.29 ONLY when ALL are true:

Microscopic hematuria confirmed:
- Positive dipstick for blood (heme-positive)
- Elevated RBCs on microscopic exam
- Urine NOT visibly discolored (not gross hematuria)
Has symptoms OR does not fit asymptomatic criteria:
- Patient has urinary symptoms (dysuria, frequency, urgency, pain, etc.)
- OR: Microscopic hematuria is new/concerning/requires workup
- OR: Does NOT meet R31.21 (asymptomatic) or R31.1 (benign essential) criteria
NOT excluded by underlying diagnosis:
- If acute cystitis WITH hematuria documented → use N30.01, not R31.29
- If glomerular disease documented → use N02.-, not R31.29
- Symptom codes are used when definitive diagnosis not established OR in addition to diagnosis when clinically relevant
Cause is unknown OR documented separately:
- Hematuria may be reason for visit/workup
- Underlying cause coded separately when identified

Typical scenarios for R31.29:

“Patient with dysuria and microscopic hematuria; UA shows RBCs and WBCs”
“Flank pain with microscopic hematuria; CT scan ordered to rule out stone”
“Microscopic hematuria with urinary frequency and urgency”
“Post-exercise microscopic hematuria with symptoms”

When NOT to Use R31.29

Do NOT use R31.29 when:

Scenario	Use Instead	Why
Blood is VISIBLE to naked eye	R31.0	That’s gross hematuria, not microscopic
NO symptoms + microscopic only	R31.21	That’s asymptomatic microscopic hematuria
Benign essential microscopic hematuria	R31.1	Specific benign essential type
Acute cystitis WITH hematuria documented	N30.01	Hematuria already included in code
Glomerular disease with hematuria	N02.-	Hematuria included in glomerular codes
Hematuria type not documented	R31.9	Unspecified (but try to avoid)
Chronic cystitis with hematuria	N30.21	Hematuria included in code

Documentation Requirements for R31.29

MINIMUM documentation needed to assign R31.29:

✅ MUST include:

Microscopic hematuria confirmed:
- “Microscopic hematuria,” “RBCs in urine,” “blood on urinalysis”
- Dipstick positive for blood OR RBCs elevated on microscopy
- Urine NOT visibly discolored
Has symptoms OR other distinguishing features:
- Urinary symptoms documented (dysuria, frequency, urgency, pain)
- OR: Clinical context showing this is NOT asymptomatic
- OR: Workup initiated for concerning hematuria
Not already included in another code:
- If definitive diagnosis includes hematuria (like N30.01), verify whether R31.29 should also be coded per guidelines

❌ CANNOT use if:

Blood is visible (use R31.0)
Truly asymptomatic with no symptoms (use R31.21)
Hematuria inherent in underlying diagnosis code

✅ SHOULD document (best practice):

Urinalysis results (RBC count, dipstick heme result)
Associated symptoms (dysuria, frequency, urgency, pain, etc.)
Clinical context (routine screening vs symptomatic presentation)
Workup initiated (imaging, cystoscopy, nephrology referral)
Underlying cause if identified

Clinical Significance of R31.29

Why R31.29 exists as separate from R31.21:

The American Urological Association requested the split of R31.2 into:

R31.21 (Asymptomatic microscopic hematuria) - low-risk, often benign
R31.29 (Other microscopic hematuria) - symptomatic or requiring investigation

Clinical importance:

Asymptomatic (R31.21) typically follows conservative AUA guidelines for workup
Symptomatic (R31.29) often requires more aggressive investigation
Distinguishing between these helps guide appropriate clinical pathway

Common causes requiring R31.29:

UTI (with symptoms)
Kidney stones (with pain)
Bladder/kidney tumors (with symptoms)
Glomerular disease (symptomatic)
Prostatic disease (with urinary symptoms)
Post-procedure hematuria (symptomatic)
Exercise-induced hematuria (with symptoms)

HCC Information

R31.29 does NOT map to a CMS-HCC - symptom codes generally do not have HCC impact
No direct HCC weight or RAF score impact
HCC mapping typically comes from underlying condition (malignancy, kidney disease, etc.), not from R31.29 itself

Use R31.29 primarily for:

Medical necessity for workup (cystoscopy, imaging, labs)
Accurate symptom documentation
Supporting complexity of evaluation

RVU / wRVU Information

ICD-10-CM codes (including R31.29) do NOT carry RVUs or wRVUs
RVUs apply to CPT/HCPCS procedure codes only
R31.29 supports medical necessity for:
- Cystoscopy (52000)
- Advanced imaging (CT urogram, renal ultrasound)
- Laboratory testing (UA, cytology, cultures)
- Nephrology or urology consultation

Typical E/M levels with R31.29:

Often moderate to high complexity due to need for workup
Justifies detailed evaluation and coordination of care

Common CPT Procedure Pairings with R31.29

Laboratory:

81001 - Urinalysis, automated with microscopy
81002/81003 - Urinalysis without microscopy
81015 - Urinalysis; microscopic only
88112 - Cytopathology, urine (voided/catheterized)
87086/87088 - Urine culture

Imaging:

76770 - Ultrasound, retroperitoneal (kidneys), complete
74178 - CT abdomen and pelvis with contrast (CT urogram)
74420 - Retrograde urography (when combined with cystoscopy)

Endoscopy (urology):

52000 - Cystourethroscopy (diagnostic)
52001 - Cystourethroscopy with irrigation and evacuation of clots
52204-52224 - Cystoscopy with biopsy or fulguration

E/M Services:

99202-99205 - Office visit, new patient
99211-99215 - Office visit, established patient
99281-99285 - Emergency department visit

Common Associated ICD-10-CM Codes

Frequently coded WITH R31.29 (when cause identified):

Infections:

N30.00/N30.01 - Acute cystitis (with/without hematuria)
N39.0 - Urinary tract infection, site not specified

Stones:

N20.0 - Calculus of kidney
N20.1 - Calculus of ureter
N20.2 - Calculus of kidney with calculus of ureter

Neoplasms:

C64.9 - Malignant neoplasm of kidney, unspecified
C67.9 - Malignant neoplasm of bladder, unspecified
D41.4 - Neoplasm of uncertain behavior of bladder

Prostatic disease:

N40.0 - Benign prostatic hyperplasia without lower urinary tract symptoms
N42.82 - Prostatitis with hematospermia

Other urinary conditions:

N28.9 - Disorder of kidney and ureter, unspecified
N13.30 - Unspecified hydronephrosis

Clinical Examples: When to Use R31.29

✅ Example 1 - Microscopic Hematuria with Dysuria

SCENARIO: 
45-year-old male presents with dysuria and suprapubic discomfort x 3 days.
Denies visible blood in urine but reports painful urination.

UA Results:
- Color: Yellow, clear (NO visible blood)
- RBC: 10-20/hpf (ELEVATED - microscopic hematuria)
- WBC: 50-100/hpf
- Bacteria: Many
- Blood: 2+ positive (on dipstick)

Assessment: UTI with microscopic hematuria

CODE: R31.29 (Other microscopic hematuria)
├─ Microscopic hematuria confirmed (RBC elevated, but urine clear)
├─ Patient HAS symptoms (dysuria, suprapubic discomfort)
├─ R31.29 captures symptomatic microscopic hematuria
└─ Could also code N30.00 or N30.01 depending on documentation

Alternative: N30.01 (Acute cystitis with hematuria) would capture both 
the infection AND the hematuria in one code

✅ Example 2 - Flank Pain with Microscopic Hematuria

SCENARIO:
52-year-old female with sudden right flank pain radiating to groin.
Urine appears normal but UA shows blood.

UA Results:
- Color: Yellow, clear
- RBC: 25-50/hpf (ELEVATED)
- WBC: 0-5/hpf (normal)
- Blood: 3+ positive

Assessment: Suspected renal calculus with microscopic hematuria
Plan: CT abdomen/pelvis to evaluate for stone

CODE: R31.29
├─ Microscopic hematuria (not visible, but UA shows RBCs)
├─ Symptomatic (flank pain)
├─ Workup initiated for underlying cause
└─ If stone confirmed, add N20.0 or N20.1 as appropriate

✅ Example 3 - Post-Exercise Hematuria with Symptoms

SCENARIO:
28-year-old marathon runner with lower abdominal discomfort and 
urinary urgency after race. UA shows microscopic hematuria.

UA Results:
- RBC: 15-30/hpf (elevated)
- Urine appears clear

Assessment: Post-exercise microscopic hematuria with urinary symptoms

CODE: R31.29
├─ Microscopic hematuria confirmed
├─ Has symptoms (discomfort, urgency)
├─ R31.29 appropriate for symptomatic presentation
└─ Not asymptomatic (R31.21) because symptoms present

❌ Example 4 - WRONG: Asymptomatic Microscopic Hematuria

SCENARIO:
40-year-old female for routine annual physical.
NO urinary symptoms reported.
UA shows incidental finding of 5-10 RBC/hpf.

Assessment: Asymptomatic microscopic hematuria

WRONG CODE: R31.29
CORRECT CODE: R31.21

WHY:
├─ Patient is ASYMPTOMATIC (no symptoms)
├─ Found incidentally on routine screening
├─ R31.21 is specifically for asymptomatic cases
├─ R31.29 is for symptomatic or "other" types
└─ The word "asymptomatic" in documentation = R31.21

❌ Example 5 - WRONG: Gross Hematuria

SCENARIO:
Patient reports passing red/pink urine x 2 days.
Urine sample appears visibly red.

UA Results:
- Color: Red
- RBC: Too numerous to count
- Blood: 4+ positive

Assessment: Gross hematuria

WRONG CODE: R31.29 (this is for MICROSCOPIC)
CORRECT CODE: R31.0 (gross hematuria)

WHY:
├─ Blood is VISIBLE to the naked eye
├─ "Microscopic" means NOT visible
├─ Visible blood = gross hematuria = R31.0
└─ R31.29 is ONLY for microscopic (invisible) hematuria

❌ Example 6 - WRONG: Hematuria Already Included

SCENARIO:
Patient with acute cystitis and hematuria.

Assessment: Acute cystitis with hematuria

WRONG: Coding both N30.01 AND R31.29
CORRECT: N30.01 ONLY

WHY:
├─ N30.01 = Acute cystitis WITH hematuria
├─ Hematuria is already included in N30.01
├─ Excludes1 note says don't code R31 when hematuria included
├─ Coding both = double-coding the same symptom
└─ N30.01 captures both the infection AND the hematuria

Common Documentation Errors to AVOID

❌ Error 1: Not Distinguishing Asymptomatic (R31.21) from Symptomatic (R31.29)

WRONG: Using R31.29 for ALL microscopic hematuria
├─ If patient is asymptomatic, must use R31.21
├─ "Asymptomatic" in documentation = R31.21, not R31.29
└─ CORRECT: Read documentation carefully for symptoms

✅ CORRECT:
- No symptoms + microscopic hematuria → R31.21
- Has symptoms + microscopic hematuria → R31.29

❌ Error 2: Using Microscopic Code for Visible Blood

WRONG: Coding R31.29 when urine appears red/pink
├─ If blood is visible, it's GROSS hematuria
├─ Microscopic = NOT visible to eye
└─ CORRECT: Visible blood = R31.0, not R31.29

✅ CORRECT:
- Visible blood → R31.0
- Microscopic (invisible) → R31.21 or R31.29

❌ Error 3: Coding R31.29 When Hematuria Included in Another Code

WRONG: N30.01 (Acute cystitis with hematuria) + R31.29
├─ Hematuria already captured in N30.01
├─ Excludes1 note prohibits coding both
└─ CORRECT: Code N30.01 only (hematuria included)

✅ CORRECT: Check if hematuria is already in the diagnosis code
- N30.01 = includes hematuria
- N30.21 = includes hematuria
- N02.- = includes hematuria
Don't add R31.x codes when hematuria already included

❌ Error 4: Not Coding Underlying Cause

WRONG: Coding only R31.29 when cause identified
├─ R31.29 is a symptom code
├─ If underlying cause found, code it
└─ CORRECT: Code underlying cause + R31.29 if relevant

✅ CORRECT:
- If stone found: N20.1 (ureter stone) + R31.29 (if symptomatic)
- If tumor found: C67.9 (bladder cancer) + R31.29 (if relevant)
- Symptom codes can supplement diagnosis codes per guidelines

❌ Error 5: Using R31.2 Instead of R31.21 or R31.29

WRONG: Coding R31.2 (parent code)
├─ R31.2 is NOT billable in current ICD-10
├─ Must use R31.21 or R31.29
└─ CORRECT: Choose specific child code

✅ CORRECT:
- R31.2 = parent code (do NOT use)
- R31.21 = asymptomatic (USE)
- R31.29 = other/symptomatic (USE)

Compliance Checklist

Before coding R31.29, verify:

Microscopic hematuria confirmed on urinalysis (RBCs elevated; urine not visibly bloody)
Patient HAS urinary symptoms (dysuria, frequency, urgency, pain, etc.)
- OR: Microscopic hematuria does not fit R31.21 (asymptomatic) criteria
Is NOT gross hematuria (visible blood = R31.0)
Is NOT asymptomatic microscopic hematuria (no symptoms = R31.21)
Is NOT benign essential microscopic hematuria (R31.1)
Hematuria is NOT already included in another code (N30.01, N02.-, etc.)
Underlying cause coded separately when identified
Clinical documentation supports symptomatic or “other” classification

Quick Reference Card

ICD-10-CM R31.29 - Other Microscopic Hematuria
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
USE WHEN:
• Microscopic hematuria (detected by lab, NOT visible)
• Patient HAS symptoms (dysuria, frequency, urgency, pain)
  OR microscopic hematuria does not fit asymptomatic criteria
• Urine appears clear/normal (not red/pink)
• RBCs elevated on UA microscopy or positive dipstick
• Not already included in underlying diagnosis code
 
DON'T USE WHEN:
• Blood is VISIBLE to naked eye → use R31.0 (gross)
• Patient is ASYMPTOMATIC (no symptoms) → use R31.21
• Benign essential microscopic hematuria → use R31.1
• Acute cystitis with hematuria → use N30.01 (includes hematuria)
• Glomerular disease with hematuria → use N02.- (includes hematuria)
• Hematuria type not specified → use R31.9 (unspecified)
 
KEY DISTINCTION:
• R31.21 = Asymptomatic microscopic (NO symptoms)
• R31.29 = Other microscopic (HAS symptoms OR other type)
 
CRITICAL:
• "Microscopic" = NOT visible to eye
• Check for symptoms to decide R31.21 vs R31.29
• Don't double-code if hematuria included in diagnosis code
 
NOT HCC:
• No direct HCC mapping
• Supports medical necessity for workup (cystoscopy, imaging)
 
BOTTOM LINE:
R31.29 = symptomatic microscopic hematuria or other 
microscopic hematuria not classified as asymptomatic.
Always check for symptoms to distinguish from R31.21.

Last Updated: February 9, 2026
For coding reference only - always verify against the current ICD-10-CM, official guidelines, payer policies, and facility rules.
Key concept: R31.29 is for microscopic hematuria WITH symptoms or other characteristics that distinguish it from asymptomatic (R31.21); the critical distinction is symptom presence. *

Explorer

R31.29