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    v1.0.28
    OpenPayerBilling CodesTemporary CodesHCPCS hcpcs-q4370-aeroguard-skin-protection-per-sq-cm
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    HCPCS Level II Q4370: Aeroguard, per square centimeter (add-on)

    HCPCS Level II code Q4370 describes billing for Aeroguard, per square centimeter, an add-on supply item intended to be reported in addition to a primary procedure; service type is medical supply/add-on item, and the typical site of service is any outpatient or facility setting where the primary procedure requiring a barrier or protective device is performed.

    For related coverage guidance, see recent payer policy updates: B-Hemolytic Streptococcus Testing, Human Immunodeficiency Virus (HIV) — Coverage Criteria for Testing and Resistance Assays, Hepatitis Testing (A, B, C, D) Coverage Criteria.

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    Clinical & Coding Specifications

    Clinical Context

    A typical patient is an adult undergoing a surgical or wound-care procedure where an antimicrobial or barrier dressing product sold under the trade name Aeroguard is applied to a post-surgical wound or chronic ulcer surface. The product is billed per square centimeter using Q4370 as an add-on supply code in addition to the primary procedure charge. Clinical workflow: the patient receives primary surgical or debridement procedure in an outpatient surgical center, hospital outpatient department, or wound clinic. After hemostasis and wound preparation, the clinician measures the wound surface area, selects the appropriately sized Aeroguard dressing, and documents the square centimeters applied. The dressing is applied to provide a protective, antimicrobial barrier and secured per facility protocol. Documentation includes the primary procedure code(s), the applied product name and size in cm2, indication for use (e.g., post-op incision protection, diabetic foot ulcer, pressure ulcer), wound measurements, and any relevant clinical findings. Typical sites of service are outpatient surgical centers, hospital outpatient departments, physician office-based procedure rooms, and wound care clinics. Common clinical scenarios include post-operative incision management after minor dermatologic or general surgical procedures, coverage of chronic ulcers following debridement, and protection of graft or donor sites.

    Related CPT Codes

    CPT CodeDescriptionRelationship to This Procedure
    11042Debridement, subcutaneous tissue (e.g., for infected or necrotic wounds)Often performed immediately before application of Aeroguard to prepare wound bed; product billed as add-on per cm2
    12002Simple repair of superficial wounds (up to 2.5 cm)After laceration repair, Aeroguard may be applied to protect incision; billed as add-on supply
    13132Secondary closure or complex repair of trunk, arms, legsFor more complex closures where an antimicrobial barrier dressing is used post-op
    97602Removal of devitalized tissue, non-selective debridement (eg, wet-to-moist, enzymatic)Performed in wound care clinics before dressing application; Aeroguard billed in addition
    15271Application of skin substitute graft, first 25 sq cmWhen used on grafts or donor sites, Aeroguard may be applied as adjunct topical barrier

    Related Modifiers

    8 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…
    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…
    59Modifier 59 indicates a distinct procedural service when two procedures that are not normally billed together are clinically and procedurally separate. The CPT definition (as reiterated by CMS)…- Use modifier -59 to report a distinct procedural service when documentation supports that the procedure reported is not normally billed together with another service on the same day because of a…
    76Modifier -76, Repeat Procedure or Service by Same Physician or Other Qualified Health Care Professional, is appended when the same provider performs an identical, medically necessary procedure or…- Use modifier -76 when the same physician or other qualified health care professional performs an identical procedure or service a second (or subsequent) time on the same date of service and the…
    77Modifier 77 indicates that a previously performed procedure or service was legitimately repeated by a different physician or other qualified health care professional. The AMA’s CPT definition…- Use modifier 77 when a basic procedure or service already performed is repeated by a different physician or other qualified health care professional (for example, a second provider independently…
    24Modifier 24 denotes an unrelated evaluation and management (E/M) service performed by the same physician or qualified healthcare professional during a postoperative global period. Per CPT guidance,…- Use modifier 24 when you report an evaluation and management (E/M) service performed by the same physician or same-specialty group during a procedure’s postoperative global period that is unrelated…
    25CPT modifier 25 indicates that on the same day as another procedure or service, the same physician or other qualified health care professional provided a significant, separately identifiable…- When to apply: Use modifier 25 only on an E/M code to indicate the same provider delivered a significant, separately identifiable E/M service on the same day as another procedure or service — i.e.,…

    Related Provider Taxonomies

    8 rows

    Taxonomy CodeSpecialtyNotes
    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…
    207K00000XAllergy & Immunology PhysicianAn allergist-immunologist is trained in evaluation, physical and laboratory diagnosis, and management of disorders involving the immune system. Select…
    261Q00000XClinic/CenterA facility or distinct part of one used for the diagnosis and treatment of outpatients. "Clinic/Center" is irregularly defined, sometimes being limite…
    207L00000XAnesthesiology PhysicianAn anesthesiologist is trained to provide pain relief and maintenance, or restoration, of a stable condition during and immediately following an opera…
    225XP0019XPhysical Rehabilitation Occupational TherapistOccupational therapists are experts at helping people lead as independent a life as possible. Occupational therapists bring an understanding of the p…
    1223X2210XOrofacial Pain DentistryA dentist who assesses, diagnoses, and treats patients with complex chronic orofacial pain and dysfunction disorders, oromotor and jaw behavior disord…
    111NN1001XNutrition ChiropractorChiropractic Nutrition is that specialty within the chiropractic profession that deals with the overall factors that affect the patient's ability to m…
    207WX0109XNeuro-ophthalmology PhysicianA neuro-ophthalmologist is a subspecialist of ophthalmology. This physician evaluates, treats, and studies disorders of the eye, orbit and nervous sy…

    Related ICD-10-CM Codes

    26 rows

    ICD-10-CM CodeDescription
    E10.52Type 1 diabetes mellitus with diabetic peripheral angiopathy with gangrene
    E10.621Type 1 diabetes mellitus with foot ulcer
    E11.52Type 2 diabetes mellitus with diabetic peripheral angiopathy with gangrene
    E11.621Type 2 diabetes mellitus with foot ulcer
    I50.9Heart failure, unspecified
    I83.10Varicose veins of unspecified lower extremity with inflammation
    I83.219Varicose veins of right lower extremity with both ulcer of unspecified site and inflammation
    L03.90Cellulitis, unspecified
    L89.223Pressure ulcer of left hip, stage 3
    L89.323Pressure ulcer of left buttock, stage 3

    Showing 1–10 of 26

    Related Payer Policy Updates

    Specialty: Infectious Disease1 / 3

    9 rows

    PolicyPayerEffective Date
    B-Hemolytic Streptococcus TestingOscar Health2026-10-01
    Human Immunodeficiency Virus (HIV) — Coverage Criteria for Testing and Resistance AssaysOscar Health2026-10-01
    Hepatitis Testing (A, B, C, D) Coverage CriteriaOscar Health2026-10-01
    Lyme Disease Testing Coverage CriteriaOscar Health2026-10-01
    Pathogen Panel TestingOscar Health2026-10-01
    Diagnostic Testing of Common Sexually Transmitted InfectionsOscar Health2026-10-01
    Testing for Vector-Borne InfectionsOscar Health2026-10-01
    Coronavirus Testing in the Outpatient SettingOscar Health2026-10-01
    Testing for Diagnosis of Active or Latent TuberculosisOscar Health2026-10-01

    Related Codes

    HCPCS-LEVEL-II-Q4139-INJECTABLE-AMNIOMATRIX-BIODMATRIX-1-CC

    HCPCS Q4139: Amniomatrix or Biodmatrix, Injectable, 1 cc

    HCPCS-LEVEL-II-Q4256-AREA-BASED-PROCEDURAL-ADD-ON-PER-SQ-CM

    HCPCS Q4256: MLG-complete Skin Graft Material, Per Sq Cm

    HCPCS-LEVEL-II-Q5132-ADALIMUMAB-AFZB-ABRILADA-10MG-INJECTION

    HCPCS Level II Q5132: Injection, adalimumab-afzb (Abrilada), 10 mg

    HCPCS-Q0035-CARDIOKYMOGRAPHY-CARDIAC-MOTION-RECORDING

    HCPCS Level II Q0035: Cardiokymography

    HCPCS-Q0081-INFUSION-THERAPY-NON-CHEMOTHERAPEUTIC-PER-VISIT

    HCPCS Level II Q0081: Infusion Therapy, Non‑Chemotherapeutic, Per Visit

    HCPCS-Q0083-CHEMOTHERAPY-NON-INFUSION-ADMINISTRATION

    HCPCS Q0083: Chemotherapy Administration, Non-Infusion Methods

    HCPCS-Q0084-CHEMOTHERAPY-INFUSION-ADMINISTRATION-PER-VISIT

    HCPCS Q0084: Chemotherapy Infusion Administration, Per Visit

    HCPCS-Q0085-CHEMOTHERAPY-INFUSION-PLUS-OTHER-TECHNIQUES-PER-VISIT

    HCPCS Q0085: Chemotherapy Infusion Plus Other Technique(s), Per Visit

    HCPCS-Q0091-PAP-SMEAR-SPECIMEN-COLLECTION-TRANSPORT

    HCPCS Q0091: Screening Papanicolaou Smear Collection and Transport

    HCPCS-Q0092-PORTABLE-XRAY-EQUIPMENT-SETUP

    HCPCS Q0092: Set-up Portable X-ray Equipment

    Showing 1–10 of 629

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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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