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    v1.0.28
    OpenPayerBilling CodesDisorders of breastICD-10-CM n63-unspecified-lump-in-breast
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    ICD-10-CM Code For Unspecified Lump In Breast: Group Overview

    The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group N63 includes diagnoses for an unspecified lump or mass in the breast, covering palpable findings or imaging-detected masses when no specific histology or etiology is recorded. These ICD-10-CM diagnosis codes are used to document clinical encounters involving evaluation and monitoring of a breast lump, capturing location and diagnostic uncertainty relevant to breast pathology. Accurate coding within the ICD-10-CM N63 group supports proper claim adjudication and complete clinical documentation and appropriate reimbursement.

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    ICD-10-CM N63: Unspecified Lump In Breast Overview

    The ICD-10-CM N63 code group represents findings recorded as an unspecified lump or mass in the breast tissue. These diagnoses target breast pathology and are used when a clinician documents a palpable or imaging-detected lump without a more specific etiologic or histologic classification. Accurate coding matters for clinical records, referral and follow-up decisions, and appropriate reimbursement for evaluation and diagnostic services.

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    When to Use

    Use a code from this group when a clinician documents an unspecified breast lump or mass and no more specific diagnosis, such as benign or malignant neoplasm, is established. These codes are appropriate for encounters focused on evaluation, monitoring, or further diagnostic workup of an uncharacterized breast lesion.

    ICD-10-CM Codes

    17 rows

    ICD-10-CM CodeDescription
    N63.0Unspecified lump in unspecified breast
    N63.10Unspecified lump in the right breast, unspecified quadrant
    N63.11Unspecified lump in the right breast, upper outer quadrant
    N63.12Unspecified lump in the right breast, upper inner quadrant
    N63.13Unspecified lump in the right breast, lower outer quadrant
    N63.14Unspecified lump in the right breast, lower inner quadrant
    N63.15Unspecified lump in the right breast, overlapping quadrants
    N63.20Unspecified lump in the left breast, unspecified quadrant
    N63.21Unspecified lump in the left breast, upper outer quadrant
    N63.22Unspecified lump in the left breast, upper inner quadrant
    N63.23Unspecified lump in the left breast, lower outer quadrant
    N63.24Unspecified lump in the left breast, lower inner quadrant
    N63.25Unspecified lump in the left breast, overlapping quadrants
    N63.31Unspecified lump in axillary tail of the right breast
    N63.32Unspecified lump in axillary tail of the left breast
    N63.41Unspecified lump in right breast, subareolar
    N63.42Unspecified lump in left breast, subareolar

    DRG Codes

    2 rows

    DRG CodeDescription
    600Non-Malignant Breast Disorders with CC/MCC
    601Non-Malignant Breast Disorders without CC/MCC

    Typical Clinical Scenarios

    • A woman in her early 30s presents to primary care with a recently noticed, mobile, well-circumscribed palpable lump in the upper outer quadrant of the right breast found on self-exam; there are no skin changes, nipple discharge, or systemic symptoms. The clinician documents a nonspecific breast mass after clinical breast exam and orders diagnostic imaging (diagnostic mammogram and targeted ultrasound) to further characterize the lesion; a code from this group is assigned for the unspecified breast lump prior to definitive imaging diagnosis. Typical codes: N63.11, N63.12
    • An older patient undergoing routine screening mammography has an incidental focal density noted in the left breast; she is asymptomatic and is referred for a diagnostic workup including ultrasound and possible biopsy. Because the imaging identifies a localized palpable or nonpalpable lump without a determined etiology at the time of the encounter, a code from this group is used to capture the unspecified lump pending pathologic correlation. Typical codes: N63.10, N63.14
    • A patient presents to the breast clinic with a long-standing palpable breast mass that has recently increased in size and occasional tenderness; prior records show intermittent documentation of a nonspecific breast lump over several years without a confirmed benign or malignant diagnosis. For management of the chronic, enlarging breast lump and care coordination (repeat imaging, biopsy planning), clinicians assign a code from this group to reflect the persistent unspecified lump as a comorbidity influencing current evaluation and treatment. Typical codes: N63.41, N63.42

    Related Codes

    N60-BENIGN-MAMMARY-DYSPLASIA

    ICD-10-CM Code For Benign Mammary Dysplasia: Group Overview

    N61-INFLAMMATORY-DISORDERS-OF-BREAST

    ICD-10-CM Code For Inflammatory Disorders Of Breast: Group Overview

    N62-HYPERTROPHY-OF-BREAST

    ICD-10-CM Code For Hypertrophy Of Breast: Group Overview

    N64-OTHER-DISORDERS-OF-BREAST

    ICD-10-CM Code For Other Disorders Of Breast: Group Overview

    N65-DEFORMITY-AND-DISPROPORTION-RECONSTRUCTED-BREAST

    ICD-10-CM Code For Deformity And Disproportion Of Reconstructed Breast: Group Overview

    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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