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    v1.0.30
    OpenPayerBilling CodesCT Breast (with/without Contrast)CPT cpt-0638t-bilateral-breast-ct-with-and-without-contrast
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    CPT 0638T: CT Bilateral Breasts Without and With Contrast

    CPT code 0638T describes a computed tomography (CT) examination of both breasts performed first without contrast and then with contrast, intended to evaluate bilateral breast anatomy and pathology; the service is an imaging study (breast CT) typically provided in an outpatient radiology or hospital imaging center setting and may include, but does not require, 3D rendering.

    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 diagnostic breast imaging after an indeterminate mammogram or ultrasound, a palpable breast mass, asymmetric breast findings, or for preoperative local staging. The provider performs a bilateral computed tomography (CT) breast examination first without contrast and then with intravenous contrast to evaluate lesion extent, multifocal or multicentric disease, chest wall invasion, or regional nodal involvement. The workflow includes patient consent and screening for contrast allergy and renal function, IV placement, non-contrast CT acquisition of both breasts, administration of iodinated contrast with timed post-contrast acquisition, image reconstruction (including optional 3D rendering), radiologist interpretation, and documentation of findings and comparison to prior studies. Typical site of service is an outpatient radiology or imaging center, hospital outpatient department, or ambulatory surgery center when performed as part of preoperative staging. A realistic scenario: a 54-year-old female with a suspicious 2.5 cm left breast lesion on diagnostic mammography and ultrasound undergoes 0638T for detailed assessment of tumor extent and evaluation for additional ipsilateral or contralateral lesions prior to surgical planning.

    Related CPT Codes

    CPT CodeDescriptionRelationship to This Procedure
    77063Magnetic resonance imaging (MRI) of the breast, including contrast when performed; unilateral or bilateral — with contrastAlternative cross-sectional modality for high-resolution breast evaluation and preoperative staging; may be performed when MRI is indicated or when CT is contraindicated.
    19083Image-guided percutaneous needle biopsy, breast, including imaging guidance (e.g., stereotactic, CT), with placement of localization device when performed; first lesionMay be performed after 0638T if CT identifies a suspicious lesion requiring tissue diagnosis; CT guidance can be used for biopsy of lesions difficult to access by ultrasound or stereotactic techniques.
    76000Fluoroscopic guidance for needle placement (eg, biopsy, aspiration), imaging supervision and interpretationMay be used when image guidance is required for procedures planned based on CT breast findings.
    77046Diagnostic mammography, including computer-aided detection (CAD) when performed; bilateralOften performed before or after CT breast examination as part of the diagnostic imaging workup and for mammographic correlation.
    76641Ultrasound, breast, unilateral, real time with image documentation, including axilla when performedCommonly performed adjunctively to characterize lesions seen on mammogram or CT and to guide ultrasound-directed biopsy.

    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…
    50Modifier –50 (Bilateral Procedure) is appended to a CPT code when an identical procedure is performed on paired anatomical structures during the same operative session. The AMA states to add…- Use modifier -50 when the same CPT surgical, diagnostic, or radiology procedure is performed on paired anatomical structures (both sides of the body) during the same operative/session by the same…
    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…
    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…

    Related Provider Taxonomies

    8 rows

    Taxonomy Code
    207RH0000X
    207K00000X
    207L00000X
    1835C0205X
    111NI0900X
    156FC0800X
    363LN0000X
    224ZE0001X

    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-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

    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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