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    v1.0.30
    OpenPayerBilling CodesCT Breast (with/without Contrast)CPT cpt-0635t-breast-ct-with-and-without-contrast
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    CPT 0635T: CT of Single Breast Without and With Contrast

    CPT code 0635T describes a diagnostic imaging service performing a computed tomography (CT) examination of a single breast first without contrast and then with contrast, commonly performed as a breast CT with and without contrast; the service type is diagnostic CT imaging and the typical site of service is an outpatient imaging center or hospital radiology department where dedicated breast CT equipment and contrast administration capability are available.

    For related coverage guidance, see recent payer policy updates: Corneal Remodeling for Refractive Errors and Corneal Grafting and Transplantation, Glaucoma Agents iDose TR (travoprost intracameral implant), Topical Treatments for Dry Eye Disease.

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    Clinical & Coding Specifications

    Clinical Context

    A 52-year-old woman with a recent abnormal screening mammogram and persistent focal breast density is referred for further evaluation with breast CT (dedicated breast computed tomography). The imaging workflow includes pre-procedure patient consent and explanation, patient positioning prone on the dedicated breast CT scanner with the targeted single breast placed in the field of view, acquisition of a non-contrast CT series of the single breast, followed by intravenous administration of iodinated contrast and repeat CT acquisition of the same breast. Image post-processing may include multiplanar reformats and optional 3D rendering for lesion conspicuity. The examination is interpreted by a board-certified radiologist with breast imaging expertise; a radiology report documents technical parameters, comparison to prior studies, lesion characterization, and recommendations for further management (ultrasound, MRI, biopsy) as indicated. Typical site of service is an outpatient imaging center or hospital radiology department equipped with dedicated breast CT capability.

    Related CPT Codes

    CPT CodeDescriptionRelationship to This Procedure
    77063Screening digital breast tomosynthesis, unilateral or bilateral; single view per breastAlternative advanced breast imaging modality used for problem solving prior to breast CT
    77061Diagnostic mammography, including CAD when performed; unilateralOften performed before or after breast CT for correlative evaluation
    76641Ultrasound breast, unilateral, real time with image documentationFrequently performed as an adjunct to evaluate lesions detected on breast CT and guide biopsy
    19083Biopsy, breast, percutaneous, with imaging guidance (e.g., stereotactic, ultrasound, MRI), first lesionPerformed if breast CT identifies a suspicious lesion requiring tissue diagnosis
    75563Magnetic resonance angiography, chest, for breast MRI protocolsBreast MRI may be performed as a complementary cross-sectional study when CT findings are indeterminate

    Related Modifiers

    8 rows

    ModifierDescriptionWhen to Use
    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…
    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…
    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…
    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…
    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…

    Related Provider Taxonomies

    8 rows

    Taxonomy Code
    261QR0400X
    207RC0000X
    363A00000X
    2084P0800X
    163WR1000X
    2084S0010X
    3336C0003X
    261QM3000X

    Related ICD-10-CM Codes

    22 rows

    ICD-10-CM CodeDescription
    C50.911Malignant neoplasm of unspecified site of right female breast
    C50.912Malignant neoplasm of unspecified site of left female breast
    C50.919Malignant neoplasm of unspecified site of unspecified female breast
    D05.10Intraductal carcinoma in situ of unspecified breast
    D05.11Intraductal carcinoma in situ of right breast
    D05.12Intraductal carcinoma in situ of left breast
    D05.90Unspecified type of carcinoma in situ of unspecified breast
    D05.91Unspecified type of carcinoma in situ of right breast
    N60.11Diffuse cystic mastopathy of right breast
    N60.12Diffuse cystic mastopathy of left breast

    Showing 1–10 of 22

    Related Payer Policy Updates

    Specialty: Ophthalmology/Optometry1 / 3

    10 rows

    PolicyPayerEffective Date
    Corneal Remodeling for Refractive Errors and Corneal Grafting and TransplantationHealth-New-England2027-02-01
    Glaucoma Agents iDose TR (travoprost intracameral implant)Mass General Brigham Health Plan2027-01-04
    Topical Treatments for Dry Eye Diseaseblue cross blue shield - louisiana2027-01-01
    Corneal Collagen Cross-LinkingMass General Brigham Health Plan2026-11-01
    VizzCigna2026-11-01
    Intraocular Lens ImplantCigna2026-11-01
    Travoprost Intracameral ImplantBluecross Idaho2026-11-01
    Ophthalmology - Pilocarpine 1.25%Cigna2026-10-15
    Intravitreal and PunctumBlue Cross Blue Shield - Rhode Island2026-10-01
    Cataract Removal Surgery for AdultsAnthem2026-10-01

    Related Codes

    CPT-0633T-CT-SINGLE-BREAST-NONCONTRAST

    CPT 0633T: CT Single Breast Without Contrast

    CPT-0634T-CT-BREAST-WITH-CONTRAST-SINGLE-BREAST

    CPT 0634T: CT Exam of Single Breast with Contrast

    CPT-0636T-CT-BREAST-BILATERAL-NO-CONTRAST

    CPT 0636T: CT of Both Breasts Without Contrast

    CPT-0637T-CT-BILATERAL-BREAST-WITH-CONTRAST

    CPT 0637T: CT Bilateral Breasts with Contrast

    CPT-0638T-BILATERAL-BREAST-CT-WITH-AND-WITHOUT-CONTRAST

    CPT 0638T: CT Bilateral Breasts Without and With Contrast

    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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