HCPCS code A4770 – Dialysis vacuum blood collection tube

Key takeaways

HCPCS code A4770 describes vacuum blood collection tubes used to draw blood samples from dialysis patients.

One unit of A4770 equals one pack of 50 tubes, not a single tube.

A4770 is an ESRD supply under consolidated billing, so its cost sits inside the facility’s bundled ESRD PPS payment.

Medicare Part B doesn’t price A4770 separately, and CMS lists it among ESRD supplies not payable to DME suppliers.

A4770 has never been a lancet code. Glucose lancets are A4259, and spring-powered lancing devices are A4258.

Pabau’s claims and inventory tools help practices track dialysis supplies and keep bundled codes off separate claim lines.

HCPCS code A4770: Definition and code details

HCPCS code A4770 is a Level II supply code for vacuum blood collection tubes used in dialysis care. The official CMS descriptor reads: Blood collection tube, vacuum, for dialysis, per 50. Each unit is a pack of 50 evacuated tubes that staff use to draw blood samples for laboratory testing.

CMS updates supply codes every year. Check the current status in the CMS HCPCS Level II code files before you rely on it for a new date of service.

What A4770 covers and what it doesn’t

A4770 covers single-use evacuated tubes for blood draws on dialysis patients. The vacuum inside each tube pulls a set volume of blood, so staff can fill it without a syringe.

Covered under A4770:

• Vacuum blood collection tubes used for dialysis-related blood draws, counted in packs of 50
• Tubes used for in-center or home dialysis patients whose care an ESRD facility manages

Not covered under A4770:

• Serum clotting time tubes for dialysis: Report A4771
• Blood glucose test strips for dialysis: Report A4772
• Dialysis supplies with no specific code: Report A4913
• Glucose lancets: Report A4259, and use A4258 for a spring-powered lancing device

A4770 is sometimes confused with glucose lancet codes, because both relate to drawing blood. It has only ever described dialysis vacuum tubes. A lancet claim under A4770 is a coding error, whatever the payer.

How ESRD consolidated billing applies to A4770

Under the ESRD prospective payment system (PPS), Medicare pays the dialysis facility a bundled rate per treatment. That rate covers the drugs, laboratory tests, supplies and services used to treat end-stage renal disease.

A4770 appears on the CMS ESRD PPS consolidated billing list. The CY 2026 list places it among ESRD supplies that are not payable to DME suppliers. In practice, that means three points:

• The ESRD facility supplies the tubes and carries their cost within its bundled payment.
• A DME supplier can’t bill Medicare Part B for A4770 for a dialysis patient.
• Any other provider that bills the tubes separately for an ESRD patient should expect consolidated billing edits to deny the line.

How to handle A4770 in your billing workflow

Because A4770 is bundled, most of the work is making sure it never reaches a claim on its own. These steps keep supply billing consistent across your team.

1. Confirm the patient’s ESRD status. Check whether the patient receives dialysis for ESRD and which facility manages their care.
2. Identify who furnished the tubes. If the ESRD facility supplied them, their cost sits in its bundled payment.
3. Check the consolidated billing list. CMS updates it each year, so use the list that matches the date of service.
4. Count units in packs of 50. One unit equals 50 tubes. Never report individual tubes as units.
5. Track usage for cost reporting. Facilities still record supply use for stock control and the annual Medicare cost report.
6. Check non-Medicare contracts. Medicaid and commercial plans may follow the bundle or set their own rules, so confirm before you bill.

Related codes for dialysis blood collection supplies

Dialysis supply codes sit close together in the A4653–A4932 range, and several share the same “per 50” unit. This side-by-side view helps you pick the right one.

A simple rule, mapped in the guide below, helps here. If the item is an evacuated tube for drawing dialysis blood samples, it’s A4770. If it’s a clotting time tube, it’s A4771. If it pricks the skin for a glucose check, it’s a lancet code.

Common denial reasons for HCPCS code A4770 and how to fix them

Most A4770 denials trace back to the bundle or to a code mix-up. Each scenario below has a clear fix.

Effective denial management on A4770 starts before submission. Flag every code on the ESRD consolidated billing list in your charge setup, and the bundled tubes stop reaching claims.

Documentation to keep for A4770 supplies

A4770 rarely earns its own payment, but the supply still needs a paper trail. Good medical billing compliance for dialysis supplies means keeping these records on file:

1. Patient ESRD status: The diagnosis and dialysis modality that place the patient under the ESRD PPS.
2. Orders for blood draws: The physician orders behind each lab draw that used the tubes.
3. Supply usage logs: Packs of 50 used, by patient or by treatment date.
4. Lot numbers: Tube lot details, which help you respond quickly if a manufacturer recalls a batch.
5. Cost report support: Purchase and usage records that back up supply costs on the Medicare cost report.

Keep these records for the retention period your payer contracts and state rules require.

Medicaid and commercial payer coverage

Medicaid rules for A4770 vary by state. Some state programs publish their own ESRD bundled lists, and others pay dialysis through a per-treatment rate. Never assume a Medicare bundling decision carries over without checking the state’s manual.

Commercial and Medicare Advantage plans usually pay dialysis under a contracted per-treatment rate. Before you bill A4770 to one of these plans, check:

• Whether the contract bundles routine dialysis supplies into the treatment rate
• Whether the plan carves out any supplies for separate payment
• Whether the plan accepts HCPCS Level II supply codes on the facility’s claim

Pairing insurance eligibility verification with each treatment cycle catches plan changes early. That matters for dialysis patients, whose coverage can shift between Medicare, Medicaid and a group plan’s coordination period.

How Pabau supports dialysis supply billing

In many nephrology and dialysis practices, supply codes live in one tool, claims in another and stock in a spreadsheet. Whoever builds the claim can’t see that a supply is bundled, so a code like A4770 ends up on a separate claim line.

Pabau, the practice management platform we build, keeps those records together. Its claims software for nephrologists lets you submit claims electronically, run real-time eligibility checks and track claim status. You can also post ERA remittances and set insurer-specific price lists.

Pabau’s inventory management tracks consumables such as collection tubes, so you can reorder before stock runs short. Your usage records then sit next to the patient record, ready for cost reporting.

The result is fewer avoidable denials and a clear record of where every supply cost lands.

Keep dialysis supply billing clean

Pabau brings claims, eligibility checks and inventory together, so bundled supplies like A4770 stay off separate claim lines. See how it works for your practice.

Book a demo

Conclusion

A4770 is a small code with one big rule: It belongs to the dialysis bundle. Once your charge setup treats the tubes as a cost the ESRD facility carries, most A4770 denials never happen.

The trade-off is that a bundled supply earns no separate payment, so its usage only shows up if your team logs it. Those logs back the Medicare cost report and tell you when to reorder. If you want claims, eligibility and supply tracking in one system, book a demo to see how Pabau handles it.

Continue your research

Billing a dialysis supply with no specific code? HCPCS code A4913 explains when to use the not otherwise specified dialysis supply code.

Need the code for glucose strips used in dialysis? HCPCS code A4772 covers blood glucose test strips for dialysis, billed per 50.

Coding the dialysis session itself? CPT code 90935 walks through hemodialysis billing and E/M bundling.

Want a framework for reducing claim denials? Denial management in healthcare outlines how to identify, track and resolve recurring denial patterns.

Looking to tighten your claims submission process? Clean claim best practices covers the required fields and errors that block first-pass payment.

Frequently asked questions