HCPCS code A4707: Description, Medicare coverage, and billing guide

Key Takeaways

HCPCS code A4707 is a Level II alphanumeric code for bicarbonate concentrate, powder, for hemodialysis, per packet – a dialysate supply used to prepare bicarbonate-based dialysis fluid for hemodialysis treatments, maintained by CMS.

Medicare Part B covers A4707 as part of the bundled ESRD Prospective Payment System (PPS) rate paid to the certified dialysis facility; it is not billed as a separate DME line item in most cases.

A4707 doesn’t carry its own separate Medicare fee schedule allowable in most cases – it’s itemized within the ESRD facility’s per-treatment bundled payment, so verify the current ESRD PPS base rate via CMS rather than assuming a standalone reimbursement figure.

Accurate documentation of the physician’s plan of care and treatment sessions, the kind of record-keeping practice management software like Pabau helps capture, gives billing teams a clean record to itemize A4707 correctly on the monthly claim.

HCPCS code A4707 is a Level II code for bicarbonate concentrate, powder, for hemodialysis, per packet – a renal dialysis supply itemized within Medicare’s bundled End-Stage Renal Disease Prospective Payment System (ESRD PPS) rather than billed as a stand-alone DME line item. This guide covers the official descriptor, Medicare coverage rules, current bundled-payment guidance, billing steps, applicable modifiers, and the documentation a certified ESRD facility needs to itemize the claim cleanly.

HCPCS code A4707: Definition and official descriptor

HCPCS code A4707 is classified under the A-series of HCPCS Level II, the alphanumeric code set maintained by the Centers for Medicare and Medicaid Services (CMS) for supplies, equipment, and services not covered by CPT. The A-series spans A0021 through A9999 and splits into three main subranges: Ambulance and other transportation services (A0021-A0999), medical and surgical supplies (A4206-A8004), and administrative, miscellaneous, and investigational codes (A9150-A9999). A4707 falls within the medical and surgical supplies subrange, inside the dialysis equipment and supplies subgroup that also covers the other dialysate concentrate codes used in hemodialysis.

The official CMS descriptor for A4707 is: Bicarbonate concentrate, powder, for hemodialysis, per packet. Bicarbonate-based dialysate largely replaced acetate-based dialysate in US hemodialysis programs because it produces less intradialytic hypotension and better hemodynamic tolerance. The powder (dry) form of bicarbonate concentrate billed under A4707 is mixed on-site using a proportioning system as part of preparing the dialysate, as distinct from the pre-mixed liquid formulation billed under A4706.

Code classification at a glance

Medicare coverage and eligibility for HCPCS code A4707

Medicare Part B covers renal dialysis services for beneficiaries with End-Stage Renal Disease (ESRD), and bicarbonate concentrate billed under A4707 falls squarely within that benefit.

Since January 1, 2011, CMS pays for essentially all supplies, equipment, drugs, and services used to furnish a dialysis treatment, in a certified facility or in a patient’s home, through a single bundled payment under the ESRD Prospective Payment System (ESRD PPS), rather than paying for each supply line item separately.

Because A4707 sits inside this bundle, it is not billed to a DME MAC on a CMS-1500 the way a standard stand-alone supply code would be.

The certified ESRD facility instead bills its monthly renal dialysis services on an institutional claim (Type of Bill 72X) to its Part A/B Medicare Administrative Contractor (A/B MAC), itemizing A4707 among the composite-rate items used. Medicare reimburses the facility at the ESRD PPS per-treatment base rate rather than paying separately for each packet of concentrate.

Billing teams new to renal dialysis coding most often go wrong here. They treat A4707 like an infusion or wound-care supply code and attempt to bill it as a stand-alone DME claim.

Under ESRD PPS consolidated billing edits, an outside supplier or provider that bills a bundled dialysis supply directly to Medicare will typically have the claim denied. The certified ESRD facility, not an outside DME supplier, is the responsible billing entity for renal dialysis services.

Core eligibility criteria

• The patient has a confirmed ESRD diagnosis (ICD-10 N18.6) and is enrolled in Medicare Part B under ESRD entitlement
• The patient is receiving outpatient maintenance hemodialysis at a Medicare-certified ESRD facility, or home hemodialysis under a certified home dialysis training program
• The bicarbonate concentrate is used to furnish the dialysis treatment itself, not for a purpose unrelated to ESRD
• The facility itemizes A4707 on its monthly ESRD claim (Type of Bill 72X) as part of the bundled per-treatment payment, rather than billing it as a separate DME line item
• If the supply is furnished for a purpose unrelated to ESRD treatment, the claim carries modifier AY to receive separate payment outside the bundle

Most patients don’t arrive at a dialysis facility with a new diagnosis. Kidney disease is usually tracked for years beforehand by a primary care practice or a metabolic health practice managing the diabetes or hypertension that caused it, well before the ICD-10 N18.6 diagnosis and ESRD entitlement take effect.

Medicaid coverage for dialysis concentrate generally mirrors Medicare’s bundled approach when Medicare is the primary payer. For Medicaid-only beneficiaries, state renal dialysis fee schedules typically apply a similar per-treatment or per-diem bundled rate rather than a line-item allowable for A4707. Always verify the specific state Medicaid ESRD payment methodology before assuming coverage.

Reimbursement rates and HCPCS A4707 fee schedule

Because A4707 is a renal dialysis service included in the ESRD PPS bundle, it typically does not carry its own separately published Medicare allowable amount the way a stand-alone DME code would. CMS instead updates the ESRD PPS base rate annually – the single per-treatment payment that already accounts for concentrate, dialyzers, tubing, and other bundled supplies.

Hardcoding a per-unit dollar figure for A4707 in a billing policy is a common and avoidable error. Verify the current ESRD PPS base rate and any facility-specific adjustments via the CMS ESRD PPS final rule rather than assuming a fixed reimbursement.

A fee schedule lookup for A4707 outside the bundle is relevant only in the narrow circumstance where the supply is billed with modifier AY for a non-ESRD-related purpose. In routine hemodialysis billing, the per-packet cost of bicarbonate concentrate is absorbed into the facility’s cost report and reflected in the annual ESRD PPS rate-setting process, not paid as a discrete line item.

Where to find current A4707 rates

• CMS ESRD PPS final rule: Published annually with the current calendar-year base rate and any wage index or case-mix adjustments
• A/B MAC provider portals: Noridian, CGS, NGS, Novitas, Palmetto GBA, and WPS each publish jurisdiction-specific ESRD billing guidance for facilities in their region
• AAPC Codify: AAPC’s HCPCS code lookup cross-references current code status and bundling notes
• PGM Billing HCPCS tool: PGM Billing’s free HCPCS lookup pulls CMS data and flags consolidated-billing status

Billing guidelines and claim submission for A4707

Claims for renal dialysis services that include HCPCS code A4707 are submitted by the certified ESRD facility on the institutional UB-04 form or its electronic equivalent, the 837I transaction, using Type of Bill 72X. This differs from most HCPCS supply codes, which are billed on the professional CMS-1500 / 837P by a DME supplier or physician practice. The steps below apply to standard Medicare Part B ESRD PPS claim submission by a certified dialysis facility.

Step-by-step claim submission

1. Confirm facility certification: Verify the ESRD facility’s CMS Certification Number (CCN) and Medicare provider agreement are active before submitting monthly renal dialysis claims.
2. Confirm the treatment plan: The physician’s plan of care should document the prescribed dialysate concentrate formulation (bicarbonate powder versus solution) and treatment frequency.
3. Itemize A4707 on the claim: Report A4707, along with the quantity of packets used, among the composite-rate items on the monthly ESRD claim. It is not entered as a stand-alone charge line the way a DME supply code would be.
4. Select Type of Bill 72X: Institutional claims for hospital-based or independent renal dialysis facilities use TOB 72X; home dialysis programs follow the same bundled claim structure.
5. Apply modifier AY only if applicable: If the concentrate, or another renal dialysis supply, is furnished for a reason unrelated to ESRD treatment, append modifier AY to allow separate payment outside the bundle. Most routine claims need no modifier at all.
6. Reconcile packet counts against treatment logs: Confirm the number of A4707 packets itemized matches the actual number of hemodialysis sessions and the concentrate volume used per session.
7. Submit and track: Monitor remittance advice for ESRD consolidated billing edits (CARC and RARC codes specific to bundled renal dialysis services) if a claim is rejected or adjusted.

Good medical documentation practices at the point of care significantly reduce rework downstream. When the treatment plan and dialysate concentrate order are captured clearly in the patient’s record, billing teams spend less time reconciling packet counts and composite-rate itemization before the monthly claim goes out.

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Applicable modifiers for HCPCS code A4707

Because A4707 is bundled into the ESRD PPS per-treatment payment, it carries far fewer modifiers than a typical stand-alone DME supply code. The modifiers below apply to the narrow set of circumstances where a renal dialysis supply is billed outside the bundle. Always verify with your A/B MAC before appending a modifier not explicitly required for your claim type.

AY, not a DME-style modifier like KX or NU, is the modifier that actually applies here. Because A4707 is a renal dialysis service, appending a DME supply modifier has no effect on ESRD PPS bundled claims and can create confusion during audit. Reserve AY strictly for the rare case where the concentrate is furnished for a reason unrelated to the patient’s dialysis treatment.

Documentation requirements

Documentation for A4707 follows the ESRD facility’s standard renal dialysis record-keeping framework: A current physician plan of care, treatment session records, and evidence that the bundled item was actually used in furnishing dialysis. What makes A4707 documentation distinct from a typical DME supply code is that it supports a bundled itemization on a facility claim, not a stand-alone medical-necessity determination.

• Physician plan of care: Signed and periodically reviewed, specifying the prescribed dialysate concentrate formulation and hemodialysis treatment frequency
• ESRD diagnosis and treatment records: ICD-10 N18.6 (or applicable ESRD code) supported by ongoing maintenance dialysis treatment notes
• Facility certification: Current CMS Certification Number (CCN) and Medicare provider agreement on file
• Treatment session logs: Documentation of dialysate composition and concentrate packets used per session, supporting the monthly itemization
• Home program documentation: For home hemodialysis, records confirming the patient or care partner completed a certified home training program and that concentrate proportioning equipment is in place

Keeping HIPAA-compliant documentation workflows in place means these records are retrievable quickly during a post-payment audit. MAC and CERT auditors reviewing ESRD claims specifically look for whether treatment logs and the physician’s plan of care support the volume of bundled supplies, including concentrate packets, itemized on the monthly claim.

Common billing errors and denial reasons for HCPCS code A4707

Denial and rejection patterns for A4707 cluster around three root causes: Billing it as a stand-alone claim, missing a modifier that doesn’t actually apply, and mismatched itemization. Understanding these patterns helps billing teams fix the root issue rather than appealing the same rejection repeatedly.

Tracking denial and rejection patterns across ESRD claims is easier when your practice management workflow captures CARC and RARC codes at the remittance stage. Patterns that repeat across multiple monthly claims usually point to a systemic itemization or certification gap, not a one-off error.

Related HCPCS codes to know

A4707 rarely appears in isolation. Hemodialysis billing typically involves several related concentrate, filter, and equipment codes itemized together within the same bundled claim. Understanding which codes are commonly grouped with A4707 helps billing teams reconcile the monthly itemization accurately.

For billers working across multiple supply code families, the NLM Clinical Table Search API provides a free programmatic HCPCS Level II lookup useful for building internal crosswalk references.

How Pabau supports HCPCS billing workflows

Billing renal dialysis supply codes accurately requires more than knowing the right descriptor. It requires a clean link between the physician’s plan of care, treatment session documentation, and the monthly bundled claim. Facilities that manage these steps in separate systems, such as a paper treatment log plus a standalone billing application, face higher rejection and audit-adjustment rates because the documentation chain breaks somewhere along the way.

Practice management software like Pabau demonstrates what that continuity looks like in a different billing context: Clinical notes, treatment records, and consent forms captured in one system, rather than split across a paper log and a separate billing tool. Pabau’s claims management tools are built for the private and commercial insurance claims that aesthetics, wellness, primary care, and dermatology practices submit day to day, not for the institutional Medicare Part B claims a certified ESRD facility files on Type of Bill 72X.

The underlying principle carries over regardless of which system prepares the claim. A physician’s plan of care and treatment session records that are complete and consistent before they reach the biller are what keep a monthly ESRD claim from drawing a consolidated billing edit, the same way complete documentation prevents a denial on any other claim type.

Conclusion

HCPCS code A4707 is a straightforward supply code once billing teams understand that it lives inside the ESRD PPS bundle rather than functioning like a stand-alone DME line item. The physician’s plan of care, accurate packet-count reconciliation, and current facility certification are the three elements that determine whether a monthly renal dialysis claim itemizes cleanly or draws a consolidated billing edit. Billing teams that build ESRD-specific reconciliation checklists into their monthly claim process will see fewer rejections than those treating A4707 like a generic supply code.

Pabau’s claims management tools connect clinical documentation directly to the claims process for the private and commercial insurance billing that aesthetics, wellness, primary care, and dermatology practices handle day to day. If that’s the kind of billing your practice manages alongside other services, book a demo to see how it works.

Continue your research

Need to check a related dialysis supply code? A4765 covers the peritoneal dialysis concentrate additive billed alongside bicarbonate concentrate in mixed dialysis programs.

Billing hemodialysis equipment on the same claim? A4918 is the venous pressure clamp code itemized alongside concentrate supplies on the monthly ESRD claim.

Curious how bundled Medicare payment rules apply outside ESRD? C1767 shows how OPPS bundles a comparable implantable device into a single facility payment.

Want to see how a modifier error trips up a different DME code? E0130 breaks down the certificate-of-medical-necessity mistake behind most denials.

Tracking denial patterns across code families? P9043 walks through the same medical-necessity and units-of-service errors that trip up billing teams elsewhere.

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