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    OpenPayerBilling CodesMedical And Surgical SuppliesHCPCS hcpcs-a4604-heated-tubing-positive-airway-pressure
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    HCPCS A4604: Tubing with Integrated Heating Element for PAP Device

    HCPCS Level II code A4604 describes a tubing with integrated heating element used with a positive airway pressure device (continuous or bilevel PAP) to reduce condensation and improve humidification; the service is durable medical equipment for respiratory therapy and the typical site of service is the patient’s home or sleep lab where PAP therapy is delivered.

    For related coverage guidance, see recent payer policy updates: Salivary Hormone Testing, Parathyroid Hormone, Phosphorus, Calcium, and Magnesium Testing, Bone Turnover Markers Testing.

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    Clinical & Coding Specifications

    Clinical Context

    A typical patient scenario involves an adult with obstructive sleep apnea (OSA) or another sleep-disordered breathing condition who uses a positive airway pressure (PAP) device at home. The patient receives a heated tubing assembly, A4604, to connect the PAP device to a mask; the integrated heating element reduces condensation (rainout) in the circuit and improves comfort and adherence. Clinical workflow: a durable medical equipment (DME) supplier receives a prescription from the treating clinician (often a pulmonologist, sleep medicine specialist, or primary care physician). The supplier verifies the PAP device model and compatibility, educates the patient on setup and cleaning, documents medical necessity and device compatibility, dispenses the heated tubing, and files the claim using A4604. Follow-up includes assessing patient tolerance, adherence data from the PAP device, and troubleshooting humidification or condensation issues during routine sleep clinic or DME follow-up visits.

    Related CPT Codes

    CPT CodeDescriptionRelationship to This Procedure
    94660Continuous positive airway pressure ventilation (CPAP), initiation and managementPerformed when initiating PAP therapy; the heated tubing A4604 is an accessory used with CPAP systems

    | 95810 | Polysomnography; sleep staging with 4 or more parameters of sleep, attended by a technologist | Diagnostic sleep study that often precedes PAP prescription; identifies need for PAP and related supplies like heated tubing |

    | 95800 | Sleep study, unattended type III portable monitor (includes at least 4 channels) | Alternate diagnostic test leading to PAP therapy and accessory prescriptions |

    | 94661 | Continuous positive airway pressure ventilation (CPAP) device, with ongoing monitoring and support | Follow-up management of PAP therapy; documentation may support continued need for replacement tubing |

    | 99070 | Supplies and materials (except spectacles), provided by the physician over and above those usually included with the office visit | Used rarely to report additional supplies; DME suppliers normally bill HCPCS A4604 for heated tubing |

    Related Modifiers

    10 rows

    ModifierDescriptionWhen to Use
    22Modifier –22 (Increased Procedural Services) is used when a reported procedure is substantially more extensive than normally required. The CPT Manual and CMS state it may be appended only when the…- When to use: Append modifier -22 to a procedural CPT code when the service performed is substantially more extensive than the usual service described by that code — i.e., the procedure required…
    23Modifier -23 (Unusual Anesthesia) is used on anesthesia service CPT codes when a procedure that normally requires no anesthesia or only local anesthesia must be performed under general anesthesia…- Use modifier -23 only on anesthesia CPT codes (00100–01999) when a procedure that normally requires no anesthesia or only local anesthesia must be performed under general anesthesia because of…
    26Modifier 26 (Professional Component) identifies and bills only the professional portion of a split service — the physician’s interpretation, report, and medical judgment — when the technical…- Use CPT Modifier -26 when you are billing only the professional component (PC) of a split‑bill eligible service—i.e., you performed the physician interpretation, medical judgment and prepared a…
    52Modifier ‑52 (Reduced Services) indicates that a service or procedure was partially reduced or omitted at the provider’s discretion, allowing reporting of the basic procedure number with a qualifier…- Use modifier -52 when a physician or qualified health professional electively reduces or omits part of a procedure or service (for example, performing fewer required views or omitting a portion of…
    53Modifier 53 (Discontinued Procedure) signals that a surgical or diagnostic service was begun by the physician but terminated because of extenuating circumstances that threatened the patient’s…- Use modifier -53 when a physician/qualified healthcare professional has started a surgical or diagnostic procedure (e.g., anesthesia administered, incision or scope insertion) and then discontinues…
    56Modifier ‑56 indicates the reporting provider furnished only the preoperative management for a surgical procedure and did not perform the intraoperative or postoperative care. It is used in…- Use Modifier -56 when a provider performs only the preoperative management in a split‑care situation (one physician manages preop care while a different physician performs the intraoperative…
    62Modifier 62 indicates that two surgeons function as co‑surgeons, each performing distinct parts of the same primary surgical procedure. It is appended to the primary procedure code (and any…- Use modifier -62 when two surgeons act as co‑surgeons (both primary surgeons) on a single definitive primary procedure, each performing distinct parts of the same surgical procedure (append -62 to…
    78CPT modifier -78 indicates an unplanned, related return to the operating or procedure room by the same provider during the global postoperative period. It is appended when treatment for a…- Use modifier -78 when an unplanned, related complication during the original procedure’s global postoperative period requires the patient to return to a formal operating or procedure room and the…
    80CPT® Modifier 80 (Assistant Surgeon) is appended to a surgical CPT code when a physician (MD or DO) provides full, continuous assistance throughout the operative procedure. It is intended only for…- Use CPT Modifier -80 when a physician (MD or DO) serves as an assistant surgeon and provides full, continuous assistance throughout the entire operative procedure; append -80 to the surgical CPT…
    82Modifier 82 is appended to a surgical CPT code to indicate that an attending physician acted as an assistant because a qualified resident surgeon was unavailable. In teaching hospitals it documents…- When to use: Append modifier 82 in teaching-hospital settings to indicate a physician served as an assistant surgeon because a qualified resident surgeon was unavailable (includes situations where…

    Related Provider Taxonomies

    8 rows

    Taxonomy CodeSpecialtyNotes
    207L00000XAnesthesiology PhysicianAn anesthesiologist is trained to provide pain relief and maintenance, or restoration, of a stable condition during and immediately following an opera…
    207Q00000XFamily Medicine PhysicianFamily Medicine is the medical specialty which is concerned with the total health care of the individual and the family. It is the specialty in breadt…
    208D00000XGeneral Practice PhysicianA physician who specializes in the general practice of diagnosing, treating, and managing patients with a variety of illnesses and conditions.
    374700000XTechnician(1) A person with specialized training in a narrow field of expertise whose occupation requires training and is skilled in specific technical processe…
    163WD1100XPeritoneal Dialysis Registered NurseNursing Service Providers · Registered Nurse
    207LH0002XHospice and Palliative Medicine (Anesthesiology) PhysicianAn anesthesiologist with special knowledge and skills to prevent and relieve the suffering experienced by patients with life-limiting illnesses. This …
    302R00000XHealth Maintenance Organization(1) A form of health insurance in which its members prepay a premium for the HMO's health services which generally include inpatient and ambulatory ca…
    343900000XNon-emergency Medical Transport (VAN)A land vehicle with a capacity to meet special height, clearance, access, and seating, for the conveyance of persons in non-emergency situations. The …

    Related Payer Policy Updates

    Specialty: Endocrinology1 / 3

    10 rows

    PolicyPayerEffective Date
    Salivary Hormone TestingOscar Health2026-10-01
    Parathyroid Hormone, Phosphorus, Calcium, and Magnesium TestingOscar Health2026-10-01
    Bone Turnover Markers TestingOscar Health2026-10-01
    Testosterone — Coverage Criteria for Measurement and MonitoringOscar Health2026-10-01
    Diabetes Mellitus Testing — Coverage CriteriaOscar Health2026-10-01
    Thyroid Disease TestingOscar Health2026-10-01
    Thyroid Disease Testingblue cross blue shield - louisiana2026-09-15
    Thyroid Disease TestingBlue Cross Blue Shield - New Mexico2026-09-04
    Parathyroid Hormone, Phosphorous, Calcium and Magnesium TestingBlue Cross Blue Shield - New Mexico2026-09-04
    Testosterone laboratory testing and managementPremera Bluecross2026-09-04

    Related Codes

    HCPCS-A4206-STERILE-SYRINGE-1CC-NEEDLE

    HCPCS A4206: Syringe with Needle, 1 cc or Less, Sterile

    HCPCS-A4207-STERILE-2CC-SYRINGE-WITH-NEEDLE

    HCPCS Level II A4207: Syringe with Needle, Sterile 2 cc

    HCPCS-A4208-STERILE-3CC-SYRINGE-WITH-NEEDLE

    HCPCS Level II A4208: Syringe with Needle, Sterile 3 cc

    HCPCS-A4209-STERILE-SYRINGE-WITH-NEEDLE-5CC-OR-GREATER

    HCPCS Level II A4209: Syringe with Needle, Sterile 5 cc or Greater

    HCPCS-A4210-NEEDLE-FREE-INJECTION-DEVICE

    HCPCS Level II A4210: Needle-free Injection Device, Each

    HCPCS-A4211-SUPPLIES-SELF-ADMINISTERED-INJECTIONS

    HCPCS Level II A4211: Supplies for Self-Administered Injections

    HCPCS-A4212-NON-CORING-NEEDLE-STYLET-CATHETER-ACCESS-SUPPLY

    HCPCS Level II A4212: Non-coring Needle or Stylet with/without Catheter

    HCPCS-A4213-STERILE-SYRINGE-20CC-OR-GREATER

    HCPCS Level II A4213: Syringe, Sterile, 20 cc or Greater, Each

    HCPCS-A4215-STERILE-NEEDLE-SINGLE-EACH

    HCPCS Level II A4215: Needle, Sterile, Any Size

    HCPCS-A4216-STERILE-DILUENT-FLUSH-10ML

    HCPCS Level II A4216: Sterile Diluent/Flush, 10 ml

    Showing 1–10 of 633

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    Frequently Asked Questions

    References

    1. 1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
    2. 2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
    3. 3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.
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