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    v1.0.30
    OpenPayerBilling CodesCT Breast (with/without Contrast)CPT cpt-0634t-ct-breast-with-contrast-single-breast
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    CPT 0634T: CT Exam of Single Breast with Contrast

    CPT code 0634T describes a computed tomography (CT) examination of a single breast performed with intravenous or intra-breast contrast material; the procedure is an advanced imaging breast CT study typically performed as an outpatient radiology service and may include, but does not require, 3D rendering of the breast anatomy for diagnostic evaluation.

    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 typical patient is a woman referred for evaluation of a suspicious focal breast abnormality after screening mammography or diagnostic mammogram and targeted ultrasound demonstrate an indeterminate mass or architectural distortion. The ordering physician (breast surgeon, breast imaging radiologist, or oncologist) requests a contrast-enhanced dedicated breast CT of a single breast to better delineate lesion extent, vascularity, and multifocality prior to biopsy or surgical planning. The clinical workflow includes patient history and consent, screening for contraindications to iodinated contrast (renal function review, allergy assessment), IV access placement, contrast administration, acquisition of multiplanar CT images of the affected breast, optional 3D rendering, radiologist interpretation (professional component), and technologist/room resources (technical component). Results are communicated to the referring provider and used to guide image-directed biopsy planning, preoperative mapping, or further staging. Typical site of service is an outpatient imaging center or hospital radiology department equipped for dedicated breast CT and contrast administration.

    Related CPT Codes

    CPT CodeDescriptionRelationship to This Procedure
    77063Magnetic resonance imaging (MRI) of the breast (contrast-enhanced), unilateralAlternative cross-sectional contrast-enhanced modality for problem solving or preoperative staging; may be ordered before or instead of dedicated breast CT.
    77061MRI of the breast, bilateral, without and with contrastBilateral MRI when more extensive assessment is needed; complements unilateral breast CT when multifocal disease is suspected.
    19083Image-guided biopsy, breast, with placement of breast localization device, when performedOften performed after lesion characterization on breast CT to obtain tissue diagnosis and localize for surgery.
    77067Screening mammography, two-view study of each breastScreening test that frequently triggers additional diagnostic imaging such as dedicated breast CT for equivocal findings.
    77055Diagnostic mammography; single view, unilateralPrior diagnostic imaging that may precede dedicated breast CT for targeted evaluation of a single breast.

    Related Modifiers

    7 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…
    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…
    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…

    Related Provider Taxonomies

    8 rows

    Taxonomy Code
    207RR0500X
    207RC0000X
    207XS0117X
    1223X0008X
    332B00000X
    332U00000X
    167G00000X
    152WP0200X

    Related ICD-10-CM Codes

    21 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
    D05.12Intraductal carcinoma in situ of left breast
    N60.11Diffuse cystic mastopathy of right breast
    N60.12Diffuse cystic mastopathy of left breast
    N60.19Diffuse cystic mastopathy of unspecified breast
    N63.0Unspecified lump in unspecified breast
    N64.0Fissure and fistula of nipple

    Showing 1–10 of 21

    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-0635T-BREAST-CT-WITH-AND-WITHOUT-CONTRAST

    CPT 0635T: CT of Single Breast Without and 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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