HCPCS code A4714 – Treated water for peritoneal dialysis

Key takeaways

A4714 covers treated water (deionized, distilled, or reverse osmosis) for peritoneal dialysis, reported per gallon.

The code is limited to peritoneal dialysis. Water and concentrates for hemodialysis are reported with other A47xx codes.

Medicare does not pay A4714 separately, because it is bundled into the ESRD facility’s prospective payment system (PPS) payment.

CMS lists A4714 as a DME ESRD supply that is not payable to DME suppliers. A supplier claim to the DME MAC is not paid.

Pabau’s claims management software keeps prescriptions, delivery records, and payer rules together, so home dialysis supply billing stays consistent.

HCPCS code A4714: Official descriptor, code type, and payment status

HCPCS code A4714 is the Healthcare Common Procedure Coding System (HCPCS) Level II code for treated water used in peritoneal dialysis, billed per gallon. The Centers for Medicare and Medicaid Services (CMS) maintains it. It is an end-stage renal disease (ESRD) supply code. Medicare pays for it only through the dialysis facility’s bundled payment.

What A4714 covers and what it excludes

A4714 covers one item: water treated by deionization, distillation, or reverse osmosis and furnished for peritoneal dialysis. Each gallon is one unit. The descriptor names the three treatment methods, so water treated another way does not fit the code.

This code describes the water alone. The dialysate solution and the tubing that carries it have their own codes. However, the machine that treats the water sits outside HCPCS supply coding entirely.

Included vs. excluded items

For a Medicare ESRD patient, the same facility bundle pays for all of these items. The coding distinctions still matter for supply logs, cost reports, and non-Medicare contracts that track each item by its own code.

Peritoneal dialysis: Clinical context for coders

Peritoneal dialysis uses the lining of the abdomen, the peritoneum, as the filter. Dialysate flows into the peritoneal cavity through a catheter, dwells there while it draws out waste and excess fluid, then drains out again. Most patients do it at home, either by hand or with a cycler overnight.

Treated water enters the picture where a peritoneal dialysis program supplies water purified to a defined standard. The descriptor ties the code to that modality. Water treatment for hemodialysis, where large volumes of water make dialysate at every session, is a different setup with different codes.

This modality check is the first thing a reviewer looks at. The patient’s file should show a peritoneal dialysis prescription before any A4714 units appear on a supply record. A patient on in-center or home hemodialysis has no use for the code.

How Medicare pays for HCPCS code A4714

In practice, Medicare does not pay separately for A4714. The CMS CY2026 ESRD PPS consolidated billing list places it among the durable medical equipment (DME) ESRD supply codes. CMS marks these codes as not payable to DME suppliers.

Under the ESRD prospective payment system, the patient’s dialysis facility receives one bundled payment that includes home dialysis supplies. Treated water for peritoneal dialysis is part of that bundle. That holds whether the facility ships it itself or pays a vendor to deliver it.

Fee schedule and payment status

A dollar amount quoted for A4714 on a third-party lookup describes a price Medicare does not pay. Check the code’s status in the annual HCPCS file and the consolidated billing list each January. The route below shows where payers pay for each gallon, depending on the patient’s coverage and who submits the line.

Billing checklist for A4714

Run through these checks before A4714 appears on any supply record or claim line.

• Modality: The patient is on peritoneal dialysis, and the prescription in the file says so.
• Water type: The water has gone through deionization, distillation, or reverse osmosis, as the descriptor requires.
• Units: One unit equals one gallon, and the billed units match the gallons delivered.
• Payer route: For Medicare ESRD patients, the facility bundle pays for the water, never a DME supplier claim.
• Non-Medicare contracts: Bill A4714 as a separate line only where a Medicare Advantage or commercial contract prices it.

Documentation requirements for home peritoneal dialysis supplies

Because the facility bundle pays for A4714, the documentation burden sits with the ESRD facility. The records below support both the dialysis claim and any later review.

• Dialysis prescription: The nephrologist’s peritoneal dialysis prescription, which establishes the modality.
• Plan of care: The interdisciplinary plan of care required under the ESRD Conditions for Coverage, updated when the modality or prescription changes.
• Supply delivery records: Dated records of each shipment, with the number of gallons delivered.
• Vendor arrangement: The written agreement with any vendor that delivers supplies on the facility’s behalf.

File these records where the facility’s error-catching claims software can check them before submission. The same file can then answer a later review request.

A4714 vs related dialysis HCPCS codes

The A47xx range mixes hemodialysis and peritoneal dialysis supplies. Several of its codes use the gallon as the billing unit. Reading the modality in each descriptor stops staff from using A4714 for the wrong fluid. Our HCPCS code index lists more neighboring supplies.

The A4714 vs A4728 distinction causes the most confusion on peritoneal dialysis records. A4728 is a finished non-dextrose solution sold by the 500 ml, while A4714 covers treated water sold by the gallon.

Tubing such as A4719 and cycler sets such as A4671 carry their own codes as well.

Modifier rules for A4714

No modifier makes A4714 separately payable by Medicare for an ESRD patient. Modifier use follows the ESRD facility’s payer rules and the claim instructions of its Medicare administrative contractor (MAC).

The AY modifier tells Medicare that an item furnished to an ESRD patient is not for the treatment of ESRD. Water for peritoneal dialysis serves only dialysis, so AY has no legitimate use on A4714.

Common A4714 billing errors and how to avoid them

A4714 errors follow a predictable pattern. Most come from treating the code as a supplier item or a hemodialysis code. Working through a clean claim checklist before submission catches most of them.

Appeal options for a denied A4714 claim

A Medicare denial of an A4714 line is usually correct, so fix the billing route before you consider an appeal. Bill a DME supplier claim that consolidated billing denied to the dialysis facility under the vendor arrangement instead.

An appeal makes sense when a payer that does price A4714 denies it in error. Under Medicare, the first level is a redetermination request to the MAC within 120 days of receiving the initial determination. Commercial and Medicare Advantage plans set their own appeal deadlines in the contract.

Attach the peritoneal dialysis prescription, the delivery record in gallons, and the contract term that prices the code. A denial management workflow then groups each A4714 denial by reason, so teams fix repeat errors at the source.

How Pabau keeps home dialysis supply billing accurate

Home dialysis billing depends on records kept in different places. The prescription sits with the nephrologist, delivery logs sit with the vendor, and payer rules sit in contracts.

Pabau, the practice management platform we build, keeps the prescription, plan of care, and supply records in the patient’s file. Its inventory management tracks deliveries against each patient’s schedule, so overshipments show up before they cost the facility.

Payments and invoicing then follow each payer’s contract, so your practice bills A4714 separately only where a payer prices it. Reporting brings supply use and payer mix together for the quarterly review.

Keep home dialysis supply records audit-ready

Pabau keeps prescriptions, plans of care, and supply records in one patient file. Billing teams can match every gallon delivered to the payer’s rules before the claim goes out.

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Conclusion

A4714 is a narrow code: treated water, for peritoneal dialysis, by the gallon. Most errors come from stretching it to hemodialysis, to finished dialysate, or to a supplier claim Medicare will not pay.

For a Medicare ESRD patient, the code is a record-keeping tool inside the facility bundle. Code the water correctly and count it in gallons. Bill it as a line item only where a non-Medicare contract prices it.

Book a demo to see how Pabau keeps home dialysis prescriptions, supply records, and payer rules in one place.

Continue your research

Billing the cycler side of home PD? HCPCS code A4671 covers the disposable cycler set and how the ESRD PPS bundle treats it.

Need a framework for recurring billing errors? Denial management in healthcare covers how to categorize, track, and resolve recurring claim denials by root cause.

Want to tighten billing compliance? Medical billing compliance outlines the documentation and policy requirements that protect practices during payer reviews.

Billing the physician side of peritoneal dialysis? CPT code 90945 covers a dialysis procedure other than hemodialysis with a single evaluation.

Working through Medicare claim channels? Medicare billing for practices explains the billing models, claiming channels, and compliance checks.

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