CPT 90940 Vascular Access Monitoring Reimbursement | OpenPayer

Summary & Overview

CPT 90940: Vascular Access Blood Flow Monitoring

CPT code 90940 covers monitoring of blood flow in a patient’s vascular access site or at vascular anastomoses to confirm patency and reduce the risk of clotting and access-related complications. Nationally, this surveillance is critical for patients who depend on reliable vascular access for therapies such as hemodialysis and for postoperative monitoring after vascular reconstruction. Effective monitoring supports access longevity, reduces emergency interventions, and can lower downstream costs associated with access failure.

Key payers in scope include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a compact overview of clinical context, typical sites of service, common payer coverage considerations, and relevant billing practices. The publication outlines expected utilization settings (outpatient dialysis units, vascular access clinics, and ambulatory outpatient centers), summarizes common modifiers used with this type of service, and points to where readers can find further details on coding guidance and payer policies.

This summary is intended for national audiences including billing professionals, clinicians involved in vascular access care, and policy analysts interested in outpatient procedural monitoring. Data not available in the input are noted where applicable.

AetnaBlue Cross Blue ShieldCigna HealthUnitedHealthcareMedicare90940CPTvascular accessdialysisblood flow monitoringoutpatientaccess surveillancevascular surgery

Billing Code Overview

CPT code 90940 describes monitoring of blood flow in a patient’s vascular access site, or at a surgical juncture where blood vessels have been joined, to ensure the access remains patent and to prevent thrombosis and related complications. This service is a vascular access surveillance and blood flow monitoring activity performed by a qualified provider.

Service type: Vascular access monitoring and surveillance
Typical site of service: Outpatient dialysis units, vascular access clinics, ambulatory surgical centers, or other outpatient settings where vascular access is used and monitored for patency and complications.

Data not available in the input regarding associated taxonomies, ICD-10 diagnoses, related codes, or payer-specific rules.

Clinical & Coding Specifications

Clinical Context

A patient with end-stage renal disease who receives chronic hemodialysis presents for routine vascular access surveillance. The patient has a surgically created arteriovenous fistula (AVF) or prosthetic arteriovenous graft (AVG) used for dialysis. During a dialysis session or during a dedicated access clinic visit the vascular access site is inspected and auscultated, and the provider uses physical exam techniques and, when indicated, noninvasive testing (e.g., duplex ultrasound) to monitor blood flow and detect stenosis, thrombosis risk, low flow, or other complications. Documentation typically includes access type and location, physical exam findings (thrill, bruit, swelling, erythema), access flow measurements if obtained, any interventions planned or performed, and clinical decision-making regarding surveillance frequency or referral for angiography/intervention. Typical site of service is an outpatient dialysis unit, vascular access clinic, or outpatient vascular surgery/radiology clinic. Typical patient scenario: a 62-year-old patient on maintenance hemodialysis with a left forearm AVF reports decreased dialysis adequacy and notes a diminished thrill; provider performs access flow monitoring and documents decreased flow and plan for referral for fistulogram and possible angioplasty.

Coding Specifications

Modifier	Description	When to Use
`00`	No modifier	Standard reporting when no modifier applies

CPT 90937: Hemodialysis with Repeated Evaluations

90935-HEMODIALYSIS-PROCEDURE-WITH-SINGLE-PHYSICIAN

CPT 90935: Hemodialysis Procedure with Single Physician Evaluation

Taxonomy Code	Specialty	Notes
208000000X	Vascular Surgery	Common specialty performing access monitoring and interventions
208100000X	General Surgery	Many general surgeons manage AV access and surveillance
207K00000X	Internal Medicine	Nephrologists in this taxonomy commonly perform access monitoring in dialysis settings
363A00000X	Radiology	Interventional radiologists perform diagnostic and therapeutic access procedures
363L00000X	Interventional Cardiology	May be involved when vascular access intervention is needed

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`I77.1`	Stricture of artery	May cause decreased inflow or outflow leading to low access flow and need for monitoring
`I80.2`	Phlebitis and thrombophlebitis of other deep vessels of lower extremities	Thrombosis of venous segments can compromise AV access patency when similar processes occur in access circuit
`I82.4`	Acute embolism and thrombosis of renal vein	Thrombotic events affecting central veins can compromise dialysis access function
`N18.6`	End stage renal disease	Primary population requiring hemodialysis and routine vascular access monitoring
`T82.7`	Infection and inflammatory reaction due to other vascular device, implant and graft	Access infection is a complication monitored during surveillance

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`36901`	Introduction of needle and/or catheter into hemodialysis circuit with imaging supervision and interpretation; initial access	Performed when establishing or re-establishing vascular access for dialysis; may precede or follow access monitoring if intervention required
`36902`	Introduction of needle and/or catheter into hemodialysis circuit with imaging; subsequent access	Used for additional access cannulation procedures in the same session
`37220`	Revascularization, endovascular, open or percutaneous, for dialysis access, initial vessel	Used for angioplasty of stenotic lesions identified during access monitoring
`36903`	Insertion of tunneled dialysis catheter, including imaging and fluoroscopy when performed	Performed when monitoring reveals failed access necessitating temporary or permanent catheter placement
`93990`	Duplex scan of arterial and/or venous inflow and outflow, noninvasive vascular studies; unilateral or bilateral, non-coded additional procedures	Noninvasive testing often used during access surveillance to quantify flow and detect stenosis

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