HCPCS Code A4624: Tracheal suction catheter billing guide

Key Takeaways

HCPCS code A4624 identifies a tracheal suction catheter (any type other than closed system), billed per unit under Medicare Part B as a durable medical equipment supply.

Medicare coverage requires documented medical necessity under CMS Policy Article A52519, including a physician order and a qualifying ICD-10 diagnosis such as tracheostomy status (Z93.0).

A4624 and A4628 are the most commonly confused suction catheter codes: A4624 covers tracheal suctioning for patients with a tracheostomy, while A4628 covers oropharyngeal suctioning only.

Pabau’s claims management software helps DME billers attach documentation to supply claims, reducing A4624 denials caused by missing physician orders or unsupported medical necessity.

Most A4624 claim denials trace back to one of three mistakes: billing the wrong catheter code, submitting without a physician order, or missing a supporting ICD-10 diagnosis. All three are preventable, and all three happen before the claim ever reaches the payer. According to CMS, accurate HCPCS Level II coding for durable medical equipment supplies is a top audit focus for Medicare Administrative Contractors.

HCPCS Code A4624: Definition and official descriptor

HCPCS code A4624 is a Level II code maintained by CMS for billing durable medical equipment supplies to Medicare and most commercial payers. The official descriptor is: Tracheal suction catheter, any type other than closed system, each.

The “any type other than closed system” language is not incidental. It specifically excludes closed suction systems, which have their own separate code. A4624 covers open-system tracheal catheters in all their standard variations: straight-tip, curved-tip, coude, and whistle-tip designs. Each catheter is billed as one unit.

Billers using claims management software can map A4624 directly to the associated equipment code at the point of supply ordering, reducing the manual lookups that cause code-mismatch denials.

Medicare coverage and eligibility for A4624

Medicare Part B covers A4624 as a DME supply under the suction pump benefit. Coverage is governed by CMS Policy Article A52519. The catheter is not covered in isolation. It must be billed alongside qualifying equipment (typically E0600, a suction pump) and supported by documented medical necessity.

The primary qualifying patient population is individuals with a tracheostomy who require regular tracheal suctioning at home. Coverage also extends to patients with other conditions requiring deep tracheal suctioning where a physician has documented clinical need.

Practices tracking patient eligibility for DME supplies benefit from having structured medical forms that capture this clinical context before a claim is filed.

Coverage criteria under CMS Policy Article A52519 include:

• The patient has a diagnosis requiring tracheal suctioning (e.g., tracheostomy status, neuromuscular disease affecting airway clearance)
• A physician or treating practitioner has ordered the suction catheter in writing
• Medical necessity for the suction equipment (E0600) is documented and supports the supply claim
• The patient is using the equipment in a home setting (or equivalent non-facility setting)
• The DME supplier is enrolled with the appropriate DME MAC jurisdiction

Coverage is not guaranteed by meeting these criteria alone. Medicare Administrative Contractors may apply additional local coverage requirements. Always verify with the patient’s assigned DME MAC before submitting.

A4624 vs A4628: Tracheal vs oropharyngeal suction catheters

The A4624 vs A4628 distinction is where most suction catheter billing errors originate. Both codes cover suction catheters. The anatomical site of suctioning separates them, and using the wrong code is a straight denial.

Noridian Healthcare Solutions, one of the four DME MACs, explicitly addresses this distinction in its guidance: A4624 is for patients requiring tracheal (deep airway) suctioning, typically those with a tracheostomy. A4628 covers oropharyngeal catheters used for oral/upper-airway suctioning.

They are not interchangeable, and a patient may legitimately need both, billed separately with appropriate diagnosis support for each. Billers handling HIPAA-compliant documentation workflows for DME supplies should ensure the correct anatomical site is captured in the clinical note before coding.

One practical rule: if the physician order says “tracheal suction catheter,” bill A4624. If it says “yankauer” or “oral suction catheter,” bill A4628. When the order is ambiguous, go back to the ordering clinician before submitting.

HCPCS Code A4624 fee schedule and reimbursement rates

Medicare reimburses A4624 at rates set by the CMS annual HCPCS fee schedule, published each calendar year. Rates vary by DME MAC jurisdiction and are subject to annual updates. The table below shows representative 2025 Medicare fee schedule figures. Always verify current rates with your DME MAC or through the CMS fee schedule lookup tool before billing.

A4624 is a low-unit-cost supply. Reimbursement per catheter is modest, but practices supplying catheters in quantity (e.g., monthly supply orders for tracheostomy patients) accumulate meaningful billing volume. Practices managing secure patient data and DME supply records in a single system reduce the reconciliation burden across high-volume supply claims.

Documentation requirements for A4624 claims

Missing documentation is the leading cause of A4624 denials. CMS Policy Article A52519 sets out the documentation standard, and DME MACs apply it consistently. Claims submitted without all required elements are denied on first submission and often not appealed successfully without the original documentation in place.

Required documentation for HCPCS code A4624 claims includes:

• Physician or treating practitioner order: A written order for tracheal suction catheters specifying the type, frequency, and quantity needed. The order must pre-date the supply delivery.
• Supporting ICD-10 diagnosis code: At minimum one diagnosis code establishing medical necessity for tracheal suctioning. Z93.0 (tracheostomy status) is the most common. See the related codes section below for additional applicable diagnoses.
• Documented frequency of use: Clinical notes or the physician order should specify how many catheters per day/week the patient requires. Medicare generally limits reimbursement to quantities consistent with clinical need.
• Medical necessity narrative: A brief clinical statement or chart note explaining why the patient requires tracheal suctioning and cannot manage secretions without the device.
• Equipment qualifier: Documentation showing the patient has a qualifying suction pump (E0600 or equivalent), since A4624 is a supply to an equipment base item.

Practices that use digital intake and clinical forms can build documentation checklists directly into the supply order workflow, so no required element is missed before the claim is submitted. Practices relying on paper forms or disconnected systems regularly find that documentation gaps are only discovered at the point of denial, weeks after the supply was delivered. Proactive compliance workflows close that gap.

How to bill A4624: Coding and claim submission guidelines

Billing HCPCS code A4624 correctly requires more than selecting the right code. Place of service, modifier usage, quantity limits, and bundling rules all affect whether the claim pays on first submission.

Place of service

A4624 is a DME supply billed to Medicare Part B. The place of service for DME supply claims is typically the patient’s home (POS 12) or the equivalent non-institutional setting. Billing A4624 under a facility POS is a common error that causes immediate denial.

Applicable modifiers

HCPCS DME supply claims commonly require condition modifiers to indicate where the item is being used. The most frequently used modifiers for A4624 claims include:

Modifier requirements vary by DME MAC and payer. Always verify applicable modifiers with your specific MAC’s billing guidance before submitting. Using the wrong modifier, or omitting a required one, causes immediate rejection at claim edit.

Bundling with E0600

A4624 is a supply code associated with the suction pump equipment code E0600. The equipment and supplies are generally billed together, with the equipment claim establishing coverage eligibility and the supply claim (A4624) billed per unit delivered. Practices handling integrated billing workflows that link supply orders to equipment records reduce unbundling errors.

Check your DME MAC’s bundling rules, as some MACs require that E0600 and A4624 be billed on the same claim or within the same billing period.

Reduce DME billing denials with Pabau

Pabau's claims management tools help DME suppliers and multi-specialty clinics attach documentation to supply claims, track physician orders, and submit HCPCS codes accurately the first time.

Book a demo

Common billing errors and how to avoid them

A4624 claims fail for predictable reasons. Most denials could be prevented if the documentation and coding were verified before submission rather than after rejection. Here are the most frequent errors and their fixes:

• A4624 used when A4628 should apply: Billing A4624 for a patient who only needs oropharyngeal suctioning (and has no tracheostomy) is a code-level error. The physician order should specify the anatomical site. If it does not, clarify before coding.
• Missing or unsigned physician order: Medicare requires the order to pre-date the supply delivery. An undated order, a verbal order without a written follow-up, or an order signed after the delivery date will cause a denial that cannot be retroactively fixed.
• Unsupported quantity: Billing for more catheters than the physician order specifies, or more than the MAC’s approved frequency, triggers a quantity limit edit. Document the clinical rationale for higher quantities before billing.
• Wrong place of service: DME supply claims must use the patient’s home as the place of service. Billing A4624 under a facility POS code is an automatic denial for most payers.
• Billing A4624 for a closed system catheter: Closed system suction catheters have their own HCPCS code. Using A4624 for a closed system catheter is a descriptor mismatch and will not pass a post-payment audit. Verify the product against the HCPCS descriptor before billing.
• Missing supporting diagnosis: A4624 claims without a qualifying ICD-10 code establishing medical necessity for tracheal suctioning will be denied for lack of medical necessity. Z93.0 (tracheostomy status) is the most reliable primary diagnosis. See the FAQ section for additional supporting codes.

Practices that review billing workflows proactively, rather than reactively after denials accumulate, typically maintain significantly lower denial rates on DME supply claims.

Related HCPCS codes to know

A4624 sits within a cluster of suction catheter and respiratory supply codes. Knowing the adjacent codes prevents miscoding and helps billers submit the correct code for each product in a supply order. Coders managing practice management workflows for respiratory supply patients often bill several of these codes simultaneously.

For a broader overview of HCPCS Level II supply code structure, the AAPC HCPCS code lookup provides searchable access to all A-codes and related supply categories. The CGS Medicare coding verification tool is useful for confirming that a specific HCPCS product has been verified for PDAC coding prior to billing.

How Pabau supports accurate DME billing and HCPCS coding

The most common reason A4624 claims deny is not a coding error. It is a documentation gap that existed before the claim was ever submitted. A signed physician order filed in a paper chart that is not attached to the claim. A frequency-of-use note buried in a clinical visit record that the billing team cannot find. An ICD-10 code missing from the supply order because the intake form did not capture the patient’s tracheostomy status.

Pabau’s claims management software addresses this at the workflow level. Supply orders, physician notes, and ICD-10 diagnoses live in the same patient record. When a biller prepares an A4624 claim, the required documentation is attached to the encounter rather than retrieved separately from a filing system. That connection, between the clinical note and the billing record, is where most DME denial prevention happens.

Practices that have shifted to paperless clinical workflows report fewer post-submission document retrieval requests from payers, because the documentation is already structured and retrievable.

For clinics billing multiple HCPCS supply codes per patient (common in tracheostomy home care), having supply histories, order dates, and quantity limits visible in one place reduces over-billing errors and supports clean claim submission on first attempt.

Pabau also supports the audit trail that DME billing compliance requires. When a MAC requests records for an A4624 claim review, the patient record in Pabau holds the physician order, the delivery documentation, the clinical notes, and the billing history in one searchable location, reducing the time staff spend pulling records for post-payment reviews.

For practices managing high-volume tracheostomy supply billing, that efficiency compounds quickly. Learn more about how Pabau handles HIPAA compliance for medical offices to understand the data security standards that support DME billing audit readiness.

Conclusion

HCPCS code A4624 is straightforward in principle and problematic in practice. The code is clear. The coverage criteria are documented. The billing rules are published by every DME MAC. What causes denials is the gap between clinical documentation and the billing record, and that gap is a workflow problem, not a coding problem.

Practices that close that gap, by connecting physician orders, ICD-10 diagnoses, and supply quantities to claims before submission, consistently outperform those that chase denials after the fact. Pabau’s integrated claims management tools are built for exactly this workflow. To see how it handles DME supply billing documentation in practice, book a demo with the Pabau team.

Continue your research

Need a HIPAA-compliant documentation framework for DME billing? HIPAA and social media compliance for medical practices covers the data handling standards that underpin secure DME billing workflows.

Want to understand how practice management software supports billing accuracy? Practice management software features explains how integrated billing, documentation, and scheduling reduce claim errors across specialties.

Looking for related HCPCS billing guides? CPT codes for coaching services is a companion reference for practices billing across multiple HCPCS and CPT code types.

Frequently Asked Questions