HCPCS code A4674: Chemicals and antiseptics billing guide

Key takeaways

HCPCS code A4674 covers the chemicals and antiseptic solution, billed per 8 ounces, used to clean and sterilize dialysis equipment.

CMS bundles A4674 into the dialysis facility’s ESRD PPS base rate, so an outside DME supplier can’t bill it separately.

Method II direct billing by home dialysis suppliers ended when ESRD PPS began in 2011, leaving Method I as the only route.

Facilities still track A4674 usage for their own supply records and cost reporting, even without a separate Medicare claim.

Practice management software like Pabau validates the fields insurers require on claims that are separately billable, flagging what’s missing before submission.

HCPCS code A4674 covers the chemicals and antiseptic solution, billed per 8 ounces, used to clean and sterilize dialysis equipment. Most billing guides treat it like a typical Medicare supply code, complete with modifier charts and Local Coverage Determination lookups. None of that machinery applies here.

CMS instead folds A4674’s cost into the dialysis facility’s own ESRD PPS payment. There’s no separate DME claim for an outside supplier to file, no LCD to check, and no fee schedule rate to look up. Here’s what billing and facility teams need to track instead.

What HCPCS code A4674 actually covers

HCPCS code A4674 is the Level II supply code for chemicals and antiseptic solution, billed per 8 ounces, used to clean or sterilize dialysis equipment. It sits in the Medical and Surgical Supplies category, alongside the rest of the A4000 to A8999 range.

Getting the descriptor exactly right still matters, even without a Part B claim attached. Facilities log this code in their own supply and cost-reporting systems, and a paraphrased or outdated description makes that internal record harder to reconcile later.

According to the Centers for Medicare and Medicaid Services (CMS), the HCPCS Level II system maintains alphanumeric codes for supplies and equipment. It covers services CPT doesn’t fully capture. A4674 sits within that system as a supply code for antiseptic solutions used specifically on dialysis equipment.

The code falls in the A4670-A4690 neighborhood, covering blood pressure cuffs, dialysis tubing, and antiseptic solutions. A single digit off routes the cost to the wrong supply record, even though no separate Medicare claim is at stake.

Which products qualify under A4674

A4674 is specifically for chemical and antiseptic solutions used to clean and maintain dialysis equipment. That’s a narrower scope than the short descriptor suggests. Treating it as a catch-all for any antiseptic product creates a mismatch in a facility’s own supply records.

Products commonly logged under A4674 include formaldehyde solutions, bleach solutions, and other CMS-recognized antiseptic chemicals used in dialysis equipment disinfection.

The PDAC (Pricing, Data Analysis and Coding contractor) verifies whether a specific product qualifies under a given HCPCS supply code. Confirm eligibility there before recording a branded product under this code.

• In scope: CMS-recognized antiseptic and disinfecting solutions for dialysis equipment maintenance
• In scope: Chemical cleaning agents used for both in-center and home dialysis equipment
• Out of scope: Topical antiseptic creams or ointments (which have separate HCPCS codes)
• Out of scope: General wound-care supplies and irrigation solutions (see A4216, A4217, A6216-series)
• Out of scope: Products not PDAC-verified for this code

Proper intake documentation at the point of care should still capture the specific product used and the equipment it services. Facilities rely on that detail for their own cost-report accuracy, not for a Medicare claim.

Why A4674 isn’t a standalone Medicare claim

HCPCS code A4674 looks like a typical Medicare Part B supply code, but it isn’t billed that way. CMS’s CY2026 ESRD PPS Consolidated Billing List places A4674 on Attachment B, under items marked “not payable to DME suppliers.” That one line changes how this code gets handled.

The reason is bundling. Since the ESRD Prospective Payment System (PPS) took effect in 2011, Medicare pays dialysis facilities one base rate per treatment.

That rate covers the drugs, tests, and supplies a patient needs, chemicals and antiseptics included. A4674’s cost sits inside that facility payment. It never becomes its own line item on a separate claim.

Two CMS billing fields confirm it, if you want the technical detail. A4674 carries a Pricing Indicator Code of 00, meaning Part B doesn’t price it separately at all. It also carries a Type of Service code of L, for ESRD supplies. Both point to the same thing: no independent fee, no independent claim.

There used to be an exception. Under “Method II,” a home dialysis patient’s non-facility supplier could bill Medicare directly for certain home dialysis items.

That option ended for dates of service on or after January 1, 2011, when ESRD PPS began. Every home dialysis claim now runs through the facility as a Method I claim, A4674 included.

Treat any A4674 line on a standalone Part B claim as a red flag, not a missed modifier. If it denies outside the facility’s bundle, that’s the Consolidated Billing edit working as CMS intended.

How facilities and billers actually handle A4674

Handling A4674 correctly isn’t about assembling a claim. It’s about routing the cost to the right place and keeping a record the facility’s own cost report can support.

1. Confirm PDAC product verification: Identify the exact chemical or antiseptic solution supplied. Confirm through the PDAC coding verification system that it’s coded to A4674, not a neighboring code.
2. Log it as a facility supply cost, not a DME claim: Record the product and cost inside the facility’s own inventory or cost-accounting system. It supports the ESRD cost report, not a Medicare Part B claim.
3. Skip the DME claim workflow entirely: There’s no CMS-1500 to file, no LCD to check, and no modifier requirement for the standard bundled scenario. Building a claim for this code invites an avoidable denial.
4. Check for the rare AY exception: It applies only when the item is unrelated to the patient’s ESRD treatment, uncommon for cleaning chemicals. Confirm before considering separate billing.
5. Track utilization for cost-report accuracy: CMS still expects facilities to document what they use, even without per-claim reimbursement. Keep usage logs current for the ESRD cost report and internal audits.

Which modifiers actually apply to A4674

Most of the modifiers billers reach for on supply codes, like KX, GA, or GY, belong to the LCD-driven DME framework. A4674 doesn’t sit inside that framework, so none of them apply in the standard bundled scenario.

If your billing software’s rules engine still fires a KX or GA prompt for A4674, that’s a configuration issue worth fixing. It isn’t a modifier you actually need to add.

What documentation A4674 still requires

There’s no MAC ADR (Additional Documentation Request) to prepare for on a claim that never gets filed. That doesn’t mean documentation stops mattering. Facilities still need a clean record for their own cost reporting and internal utilization tracking.

• Product and quantity used: Ties the specific chemical or antiseptic solution to the equipment it serviced, for internal supply records
• PDAC verification record: Confirms the supplied product is coded to A4674, supporting accurate cost-center allocation
• Cost-report supply entries: Keeps the ESRD facility’s cost report reconciled with actual usage
• Standard record retention: Follow the facility’s usual retention policy for supply and cost-accounting records, since this isn’t a claim subject to Medicare’s per-claim documentation rules

Consistent HIPAA-compliant record-keeping still supports audit readiness, even for a bundled supply. A clean, searchable history of what was used and when makes cost-report reconciliation faster whenever CMS or a facility’s own auditors ask.

Which HCPCS codes sit next to A4674

A4674 sits within the A4670-A4690 supply code cluster. Choosing the wrong neighbor is one of the most common coding errors in this range.

The table below maps the nearby codes so you can confirm A4674 is the right choice.

There’s no A4675. CMS’s numbering jumps straight from A4673 to A4674, then on to A4680. If you’re looking for a dialysis tourniquet, that’s A4929, a separate code entirely, not a neighbor in this sequence.

Practices billing dialysis-adjacent services alongside genuinely payable codes benefit from a clear split. Keep supply records like A4674 separate from anything that reaches a claim, and you cut the risk of one crossing into the other’s workflow.

Mistakes that trip up A4674 billing

Errors with A4674 follow a different pattern than typical DME denials. Most come from treating a bundled ESRD supply like a standalone claim.

Getting dialysis-adjacent billing right takes the same discipline as any other part of a practice’s revenue cycle. Know which codes are bundled, know which are separately payable, and keep clean records either way.

This mixed workflow isn’t unique to dialysis. A functional medicine practice billing bundled lab panels next to separately payable visit codes faces a similar mixed workflow. A metabolic health practice sees the same pattern, tracking bundled screening panels alongside standalone follow-ups.

Where practice management software fits around A4674 billing

Billing teams handling dialysis-adjacent codes are usually juggling both worlds. Bundled ESRD supplies like A4674 never reach a claim, while separately payable codes for other services absolutely do. Mixing the two up wastes review time on a code that was never going anywhere.

Practice management software like Pabau doesn’t file a claim for A4674, because there isn’t one to file. Where it helps is everywhere else in the workflow. It validates the fields insurers require before a claim goes out, and blocks submission when something’s missing or invalid.

That status dashboard means billing staff spend their attention on the codes that are actually reimbursable. They’re not chasing a rate that was never coming for a bundled supply.

Keep your billable codes clean and validated

Pabau's claims management software validates the fields insurers require before a claim goes out. A live status dashboard then shows where each one stands, so review time goes to codes that are actually reimbursable.

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Conclusion

HCPCS code A4674 doesn’t need a modifier strategy or an LCD lookup. It needs the opposite instinct. CMS already settled the payment question by folding this supply into the dialysis facility’s ESRD PPS base rate.

Get that framing right, and the rest is straightforward. Confirm the product through PDAC, and log it in the facility’s own cost-reporting system. Then save your team’s billing effort for the codes that actually reach a claim.

Practice management software like Pabau keeps that distinction clear, validating the codes you do submit so nothing incomplete slips through. Book a demo to see how Pabau supports billing teams working across bundled and separately payable codes.

Continue your research

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Billing a vaccine administration instead? G0010 covers the Hepatitis B vaccine administration code and its documentation rules.

Need a code outside the HCPCS Level II system? 11643 covers billing for excising a malignant facial lesion over 4 cm.

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