HCPCS code A4470 – Gravlee jet washer billing guide

Key takeaways

HCPCS code A4470 describes the Gravlee jet washer, an A-series medical supply code used to collect endometrial cells for cytology.

Medicare covers the washer under NCD 230.5 only for patients with symptoms of endometrial disease, while Medicaid and commercial coverage varies by payer.

Claims submitted without the right modifier or documentation are often denied, as are claims that lack medical necessity or carry the wrong place of service.

Pabau’s claims management software helps ob-gyn practices submit and track claims and spot rejections early.

HCPCS code A4470: definition and code category

HCPCS code A4470 is the Level II code assigned to the Gravlee jet washer, a single-use gynecological supply device. It belongs to the A-series of HCPCS codes (A0000-A9999), which covers transportation services and medical and surgical supplies. The Centers for Medicare and Medicaid Services (CMS) maintains the range as part of the Healthcare Common Procedure Coding System.

The code is active in the 2026 HCPCS code set. Use the reference table below to confirm the core code attributes before billing.

Within the A-series, A4470 falls in the medical and surgical supplies range. It describes a single-use procedure supply, not durable medical equipment (DME) meant for use at home.

What does the Gravlee jet washer do?

The Gravlee jet washer is a disposable device designed for endometrial lavage and sampling. It is inserted into the uterine cavity, where a fluid jet dislodges endometrial cells, which are then collected for cytological analysis. The procedure supports diagnostic evaluation without surgical entry into the uterine cavity.

The device is used in ob-gyn offices, gynecologic oncology practices, and outpatient women’s health centers. Its main clinical applications are:

• Endometrial cell collection for cytology
• Office-based uterine lavage as an alternative to endometrial biopsy
• Adjunctive sampling during gynecological workup for abnormal uterine bleeding
• Sampling in patients where an endometrial biopsy is not feasible

The washer is consumed during the procedure, so A4470 identifies it as a supply, separate from the procedure code such as CPT 58100. Separate A4470 reimbursement depends on payer policy, and many payers bundle the supply into 58100.

A4470 Medicare coverage and payer policy

Medicare covers the Gravlee jet washer under a national coverage determination, NCD 230.5, when the patient has symptoms or signs of endometrial disease. Irregular or heavy vaginal bleeding is the example the policy gives. Medicare won’t pay for the washer, or the related diagnostic services, when it’s used to examine an asymptomatic patient. That limit is the statutory exclusion for routine checkups in §1862(a)(7) of the Social Security Act.

The CMS HCPCS file gives A4470 coverage code D, meaning special coverage instructions apply. The same NCD wording governs the Vabra aspirator, billed under A4480.

Before billing, confirm with the Medicare Administrative Contractor (MAC) for your jurisdiction how it applies NCD 230.5. MACs can differ on the documentation they expect and on how they process a supply line that carries no separate price.

Medicaid coverage for A4470 is jurisdiction-specific. State programs set their own fee schedules for supply codes, and some states exclude gynecological supply codes from Medicaid reimbursement entirely. Always verify against the specific state Medicaid fee schedule rather than assuming coverage by analogy with another state.

2026 fee schedule and reimbursement rates for A4470

Medicare publishes no payment allowance for HCPCS code A4470. The CMS HCPCS file gives it pricing indicator 00, which means the code isn’t separately priced under the Part B fee schedules. Ask your MAC how it handles the supply line before you bill it.

For commercial payers that do cover A4470, reimbursement rates are contract-specific and are not published in a public schedule. Contact each payer’s provider relations team or consult your contract fee schedule to determine the allowed amount.

To check the pricing indicator and coverage code for any HCPCS code, use the CMS HCPCS quarterly update files or the AAPC HCPCS code lookup. Both reflect each update. Indicators and rates can change each January 1, so verify before billing in a new plan year.

How to document and bill A4470 correctly

Accurate billing for HCPCS code A4470 requires documentation that connects the device to a specific clinical service. Without this link, payers have no basis for coverage review and will deny the claim on medical necessity grounds. Good medical billing compliance practices start with documentation quality before the claim is submitted.

Follow these steps to build a clean claim:

1. Physician or provider order: Confirm a signed order authorizing endometrial lavage or sampling using the Gravlee jet washer. The order should reference the clinical indication.
2. Procedure note: Document that the device was used during the encounter, including the date, the clinical rationale, and the patient’s diagnosis. Link the device to the procedure code, such as CPT 58100 for endometrial sampling or add-on code 58110 when sampling is done with colposcopy. Separate A4470 reimbursement depends on payer policy, and many payers bundle the supply into 58100.
3. Medical necessity statement: If the payer requires prior authorization or pre-approval, obtain it before the procedure. Note the diagnosis code supporting the indication. For Medicare, it should reflect the symptom NCD 230.5 requires, such as abnormal uterine bleeding.
4. Claim form population: Report A4470 on the CMS-1500 form (or 837P electronic claim). Units should reflect the actual quantity of devices used. One device per session is typical.
5. Place of service: Use the correct POS code for the setting (office: POS 11; outpatient hospital: POS 22). Mismatched POS codes cause automatic denials for supply codes.

Applicable modifiers for A4470

Modifier selection depends on why you expect the claim to be denied. A statutory exclusion takes one modifier, and a medical-necessity concern takes another.

For Medicare, the choice follows the reason for the expected denial. Use GY when the washer screened a patient without symptoms, because that use is excluded by statute. Use GA (ABN on file) or GZ (no ABN) when the patient has symptoms but you expect Medicare to question medical necessity. The diagram below maps the three paths.

Adjacent and commonly confused HCPCS codes

A4470 sits within a sequence of A-series supply codes. Coders sometimes assign an adjacent code or a procedure code that bundles the supply, creating overpayment risk or denials. The table below maps out the most relevant adjacent codes.

One misassignment to avoid is using A9270 in place of A4470. A9270 is appropriate only when no specific HCPCS code exists for the item. Since A4470 is the designated code for this device, using A9270 is incorrect and may delay reimbursement from payers who do cover the supply. Use the PGM Billing HCPCS lookup tool to verify code assignments before submitting.

Common reasons A4470 claims are denied

Denials on HCPCS code A4470 cluster around a few recurring causes. The CARC (Claim Adjustment Reason Code) or RARC (Remittance Advice Remark Code) on the remittance points to the fix. Our guide to denial codes in medical billing explains each one, and structured denial management strategies speed up resubmission.

• Non-covered item (CARC 96): The payer doesn’t cover the supply for this patient, often because the washer was used for screening without symptoms. Resolution: If correct, bill the patient under the ABN or write off the balance. If a supplemental insurer needs a Medicare denial, send a corrected claim with GY for screening use, or GA or GZ for a medical-necessity denial.
• Missing or incorrect modifier (CARC 4): The claim lacked the payer-required modifier. Resolution: Resubmit with the correct modifier: GY for a statutory exclusion, GA or GZ for an expected medical-necessity denial, or KX only where payer policy requires it.
• Lack of medical necessity (CARC 50): The payer found no supporting clinical documentation. Resolution: Attach the procedure note and physician order to the appeal. For Medicare, make sure the linked diagnosis reflects the symptom NCD 230.5 requires.
• Wrong place of service (CARC 5): The POS code on the claim doesn’t match the dispensing setting. Resolution: Correct the POS code and resubmit. If the supply was dispensed in an office setting, use POS 11.
• Duplicate claim (CARC 18): A4470 was already processed for that date of service. Resolution: Confirm the prior claim’s status before resubmitting. If the original was denied, use a corrected claim, not a duplicate.

Tracking denials by CARC over a rolling 90 days shows whether one payer is systematically denying A4470. Isolated errors look different, and that distinction determines whether the fix is a documentation change or a payer policy appeal.

How practice management software supports A4470 billing

HCPCS code A4470 turns up rarely in an ob-gyn billing queue, so its modifier and documentation rules are easy to forget between claims. Claims management software keeps each claim visible from submission to payment, so your team can fix a rejection while the encounter is still fresh.

In Pabau, the practice management platform we build, claims are submitted from the data already recorded for the encounter. Pabau’s claims management helps ob-gyn practices submit and track claims and spot rejections early. Your coder still chooses A4470 and its modifier, so the checks in this guide stay part of the routine.

Many practices bill A4470 alongside a long list of gynecological procedure codes. For them, one view of claim status across the medical billing workflow shows whether rejections cluster around one payer or one code.

Track A4470 claims from submission to payment

Pabau’s claims management helps ob-gyn practices submit and track claims and spot rejections early, so your billing team spends less time chasing appeals.

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Conclusion

HCPCS code A4470 turns on one question before any other: does the record show symptoms of endometrial disease? If it does, NCD 230.5 is met. If the washer was used for screening, Medicare excludes it, and GY tells the payer you know that.

Don’t expect a Medicare payment for the washer itself, since A4470 isn’t separately priced. Put the effort into the documentation and modifier that keep the claim clean. Book a demo to see how Pabau helps ob-gyn practices submit, track and resolve claims like these.

Continue your research

Need a complete picture of denial patterns in your ob-gyn practice? Denial management in healthcare walks through the CARC/RARC framework and how to build a systematic appeals process.

Billing a different endometrial sampling device? HCPCS code A4480 covers the Vabra aspirator and the national coverage policy behind it.

Coding the sampling procedure itself? CPT code 58100 explains how to bill an endometrial biopsy.

Want to understand how supply codes fit into the broader billing picture? Medical billing workflows explained covers the end-to-end process from encounter to payment posting.

Frequently asked questions