51725

🩺 CPT 51725 — Simple Cystometrogram (CMG) (eg, Spinal Manometer)

Quick Reference

wRVU: Verify current CMS MPFS¹ | Global Period: 000 (same day) | Assistant Payable: ❌ No | Bilateral Indicator: 0

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📋 Clinical Description

CPT 51725 describes a simple cystometrogram (CMG) utilized to assess bladder function. The provider inserts a urethral catheter to empty the bladder, then slowly instills fluid (sterile water or saline) into the bladder. A simple, non-electronic measuring device—such as a spinal manometer—is attached to the catheter to measure intravesical pressure as the bladder fills. This code is distinct from the complex cystometrogram family (e.g., 51726) because it relies on basic mechanical pressure readings rather than calibrated, computerized electronic transducer equipment.

N31.9 or persistent urinary incontinence are common drivers for urodynamic testing. The clinical goal is to measure bladder capacity, evaluate abnormalities in bladder wall compliance, and observe involuntary detrusor contractions. Without establishing bladder pressure dynamics, the precise etiology of complicated incontinence or voiding dysfunction may remain undetermined.

This procedure may be performed in the following clinical contexts:

• Refractory Urinary Incontinence — To determine if incontinence is due to detrusor overactivity versus sphincter weakness when initial conservative therapies fail.
• Neurogenic Bladder — To monitor bladder pressures in patients with spinal cord injuries or multiple sclerosis.
• Benign Prostatic Hyperplasia (BPH) — To distinguish bladder outlet obstruction from underlying detrusor muscle failure prior to surgical intervention.
• Assessment of Bladder Capacity — To evaluate severe urinary frequency and urgency when interstitial cystitis or a contracted bladder is suspected.

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🔬 Anatomical & Procedural Considerations

Modality / Technique	Mechanism / Steps	Key Notes
Simple Cystometry	Fluid is infused into the bladder via a catheter. A simple water column (spinal manometer) visibly rises and falls, providing manual pressure readings at various infused volumes.	Relies on manual observation and recording. Does not involve electronic multi-channel transducers or simultaneous rectal pressure readings.

Clinical Pearl

The critical differentiator between 51725 (Simple) and 51726 (Complex) is the equipment utilized. If the provider uses a computerized, calibrated electronic urodynamics machine with transducers to measure intra-abdominal, true detrusor, and total bladder pressures simultaneously, code 51726. If they use a basic mechanical gravity or manometer setup, code 51725.

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✅ Procedure Includes

• Urethral catheterization necessary to perform the test
• Emptying the bladder to measure initial residual volume
• Setup of the manometer and infusion system
• Gradual instillation of fluid into the bladder
• Manual recording of bladder pressures at specific volume intervals (e.g., first urge, strong urge, maximum capacity)
• Provider interpretation and written report of the findings

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❌ Excludes / Do Not Report Together

Code	Description	Relationship to 51725
51726	Complex cystometrogram (ie, calibrated electronic equipment)	Mutually exclusive. Do not report a simple and complex cystometrogram during the same encounter.
51701	Insertion of non-indwelling bladder catheter	Bundled. The catheterization required to perform urodynamics is included in the procedure and cannot be billed separately.
51702	Insertion of temporary indwelling bladder catheter	Bundled. Routine catheterization is included in urodynamics testing.
E/M codes (992xx)	Office visit, any level	Separately reportable only when modifier -25 is appended to the E/M code, documenting a significant, separately identifiable E/M service.

Bundling Alert — Global Period is 000, Not 010

The global period for 51725 is 000 (same day). This procedure is generally diagnostic. The catheterization performed strictly to facilitate the CMG is bundled and cannot be reported with 51701 or 51702.

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🌳 Code Tree — Surgery: Urinary System

CPT 50010-53899  Surgery: Urinary System
│
├── 51725-51798  Urodynamic Procedures on the Bladder
│   ├── ▶▶ 51725 ◀◀  Simple cystometrogram (CMG) (eg, spinal manometer)  ← YOU ARE HERE  (Global: 000)
│   ├── 51726  Complex cystometrogram (ie, calibrated electronic equipment)  (Global: 000)
│   ├── 51727  Complex cystometrogram... with urethral pressure profile studies  (Global: 000)
│   ├── 51728  Complex cystometrogram... with voiding pressure studies  (Global: 000)
│   └── 51729  Complex cystometrogram... with voiding pressure and urethral pressure profile  (Global: 000)

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💰 RVU & Reimbursement Profile

Component	Value
Work RVU (wRVU)	Verify against current CMS MPFS
Global Period	000 (same day)
Bilateral Indicator	0 — The 150% payment adjustment for bilateral procedures does not apply. The bladder is a midline organ.
Assistant Surgeon	❌ Not payable
Co-Surgeon	❌ Not applicable
Team Surgery	❌ Not applicable
PC/TC Split	✅ Yes — Professional (-26) and Technical (-TC) component split applies.
Modifier -51 Exempt	No
Anesthesia	None typically required; topical lidocaine jelly may be used for catheter insertion.

PC/TC Split Billing Rules

CPT 51725 is subject to a Professional/Technical component split. If the physician owns the equipment and performs the test in their own office, bill the code globally (no modifier). If the test is performed in a facility (e.g., hospital outpatient department), the facility bills 51725-TC for the equipment/staff, and the physician bills 51725-26 for the interpretation and report.

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🏷️ Modifier Reference

Modifier	Name	When to Apply
-26	Professional Component	Physician provided the interpretation and report but did not own the equipment (e.g., test performed in a hospital setting).
-TC	Technical Component	Facility provided the equipment, supplies, and staff, but not the physician interpretation.
-25	Significant, Separately Identifiable E/M	Applied to the E/M code — not 51725 — when an office visit is performed on the same date; documentation must support an evaluation beyond the decision to perform the urodynamics.
-51	Multiple Procedures	When 51725 is performed alongside other distinct urodynamic or surgical procedures at the same session; apply to the lower-valued code.
-59	Distinct Procedural Service	When payers inappropriately bundle 51725 with another procedure; must document an independent service.

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🩺 Common ICD-10-CM Pairings

Incontinence & Voiding Symptoms

ICD-10 Code	Description	HCC?	Clinical Notes
N39.3	Stress incontinence (female) (male)	❌ No	Common indication; involuntary leakage with exertion.
N39.41	Urge incontinence	❌ No	Strong, sudden need to urinate followed by involuntary leakage.
N39.46	Mixed incontinence	❌ No	Combination of stress and urge incontinence.
N32.81	Overactive bladder	❌ No	Use when urgency/frequency are present, even if incontinence is not.
R32	Unspecified urinary incontinence	❌ No	Use only if the specific type of incontinence is not yet determined.
R35.0	Frequency of micturition	❌ No	Frequent urination symptom.

Neurological & Structural Etiologies

ICD-10 Code	Description	HCC?	Clinical Notes
N31.9	Neuromuscular dysfunction of bladder, unspecified	✅ HCC 123	Neurogenic bladder. Pair with the underlying neurological etiology if known.
N40.1	Benign prostatic hyperplasia with lower urinary tract symptoms	❌ No	Used when evaluating outlet obstruction in males.

Coding Specificity Reminder

A common omission is failing to code the underlying neurological etiology for a neurogenic bladder. If the patient has Multiple Sclerosis (G35.A) or a spinal cord injury (e.g., S14.-) causing the bladder dysfunction, ensure that etiology code is reported alongside the bladder symptom code to fully support medical necessity for urodynamic testing.

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🏥 MS-DRG Considerations (Inpatient)

Inpatient Coding Reminder

CPT 51725 is performed primarily in the outpatient / office setting. There are no routine MS-DRG assignments for this procedure — inpatient admission for an isolated simple cystometrogram would not be supported by any payer or utilization review body. If a patient undergoing an inpatient admission for an unrelated diagnosis also has this procedure performed, an ICD-10-PCS code may be assigned for completeness, but it will have no meaningful impact on DRG grouping.

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🔧 ICD-10-PCS Equivalents (Inpatient Facility Coding)

Note

Inpatient PCS coding for urodynamics maps to the Measurement and Monitoring section (4). The root operation is Measurement (determining the level of a physiological or physical function).

PCS Code	Full Description	Applicable Modality
4A0D7BZ	Measurement of Urinary Flow, Via Natural or Artificial Opening	Catheter-based bladder pressure/flow measurement

PCS Character Analysis — 4A0D7BZ

Position	Character	Value	Definition
1	Section	4	Measurement and Monitoring
2	Body System	A	Physiological Systems
3	Root Operation	0	Measurement (determining the level of a physiological or physical function)
4	Body System	D	Urinary
5	Approach	7	Via Natural or Artificial Opening
6	Function/Device	B	Flow
7	Qualifier	Z	No Qualifier

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📝 Coding Examples

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Example 1 — Office: Simple CMG for Urge Incontinence

Clinical Scenario: A 68-year-old female presents for a scheduled simple cystometrogram to evaluate persistent urge incontinence that has failed anticholinergic therapy. The physician inserts a urethral catheter and connects it to a spinal manometer. The bladder is filled with sterile saline. The physician visually monitors and records the manometer pressures, noting a severe involuntary detrusor contraction at 150 mL of filling. The catheter is removed, and the physician generates an interpretation report diagnosing severe detrusor overactivity.

Field	Code	Rationale
CPT	51725	Simple cystometrogram using a spinal manometer, performed globally in the office.
PDx	N39.41	Urge incontinence is the definitive finding and reason for the study.

Note

The urethral catheterization is bundled into the CMG and is not separately billed. Because the test was performed in the physician’s office with their own equipment, no -26 or -TC modifier is used.

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Example 2 — Outpatient Hospital: Simple CMG with E/M

Clinical Scenario: A 72-year-old male with a history of BPH presents to the hospital outpatient urology clinic complaining of new, severe lower abdominal pain and absolute inability to void for the past 12 hours. The physician performs a detailed E/M, diagnosing acute urinary retention. To assess bladder compliance before planning surgical intervention, the physician orders and performs a simple cystometrogram using hospital equipment. A catheter is placed, and a manometer measures the pressure, showing an atonic bladder with massive capacity. The physician writes the formal interpretation.

Field	Code	Rationale
CPT 1	99214-25	A significant, separately identifiable E/M was performed to evaluate the acute abdominal pain and retention.
CPT 2	51725-26	Simple cystometrogram. Modifier -26 is appended because the physician is billing only for the professional interpretation; the hospital owns the equipment.
PDx	R33.8	Other retention of urine.
SDx	N40.1	Benign prostatic hyperplasia with lower urinary tract symptoms.

Warning

The -25 modifier belongs on the E/M code, not the urodynamic procedure. The -26 modifier is critical here; if the physician billed the global code in a facility setting, it would be denied or constitute an overpayment.

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⚠️ Common Coding Pitfalls

• Confusing 51725 with 51726: This is a major compliance risk. Billing 51726 (complex CMG) when only a simple spinal manometer or gravity measurement was utilized upcodes the service. The operative note must explicitly describe the use of calibrated electronic equipment to support 51726.
• Billing catheter insertion separately: CPT 51701 or 51702 (catheter insertion) is bundled into the payment for urodynamic studies. Billing catheterization alongside 51725 will trigger NCCI edits and unbundling denials.
• Failing to split-bill in a facility: If the physician performs 51725 in a hospital or ASC setting, they must append modifier -26 for the professional component. Failing to do so inappropriately claims the technical RVUs for equipment the physician does not own.
• Incomplete documentation: The code requires both the technical performance of the test and a formal, written interpretation by the physician. If the physician’s note simply states “CMG performed, normal,” without a dedicated interpretation report of the pressures and volumes, the service may fail an audit.

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📎 Sources

¹ CMS 2026 Medicare Physician Fee Schedule Relative Value Files
² AMA CPT 2026 Professional Edition
³ NCCI Policy Manual for Medicare Services, Chapter 7 (Surgery: Urinary System), CMS 2026
⁴ ICD-10-CM Official Guidelines for Coding and Reporting FY2026
⁵ CMS Medicare Coverage Database, Local Coverage Determinations (LCDs) for Urodynamics