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    v1.0.28
    OpenPayerBilling CodesIn situ neoplasmsICD-10-CM d04-carcinoma-in-situ-of-skin
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    ICD-10-CM Code For Carcinoma In Situ Of Skin: Group Overview

    The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group D04 includes noninvasive malignant epithelial neoplasms of the skin, such as Bowen disease and other carcinoma in situ lesions limited to the epidermis. These ICD-10-CM diagnosis codes are used to document localized, noninvasive skin malignancies, capturing lesion location and clinical extent without invasion. Accurate coding within the ICD-10-CM D04 group supports proper claim adjudication and complete clinical documentation for care coordination and billing.

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    ICD-10-CM D04: Carcinoma In Situ Of Skin Overview

    The ICD-10-CM D04 code group represents carcinoma in situ of the skin, referring to noninvasive malignant epithelial neoplasms confined to the epidermis. These diagnoses target dermatologic oncology and early-stage malignant lesions of cutaneous tissue. Accurate coding matters for correct claim processing and reflects the stage and management needs of the lesion.

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    When to Use

    Use a code from this group when a clinician documents a noninvasive malignant skin lesion limited to the epidermis with no evidence of invasion. Codes are applied to capture the specific anatomical location and clinical description of carcinoma in situ of the skin.

    ICD-10-CM Codes

    21 rows

    ICD-10-CM CodeDescription
    D04.0Carcinoma in situ of skin of lip
    D04.10Carcinoma in situ of skin of unspecified eyelid, including canthus
    D04.111Carcinoma in situ of skin of right upper eyelid, including canthus
    D04.112Carcinoma in situ of skin of right lower eyelid, including canthus
    D04.121Carcinoma in situ of skin of left upper eyelid, including canthus
    D04.122Carcinoma in situ of skin of left lower eyelid, including canthus
    D04.20Carcinoma in situ of skin of unspecified ear and external auricular canal
    D04.21Carcinoma in situ of skin of right ear and external auricular canal
    D04.22Carcinoma in situ of skin of left ear and external auricular canal
    D04.30Carcinoma in situ of skin of unspecified part of face
    D04.39Carcinoma in situ of skin of other parts of face
    D04.4Carcinoma in situ of skin of scalp and neck
    D04.5Carcinoma in situ of skin of trunk
    D04.60Carcinoma in situ of skin of unspecified upper limb, including shoulder
    D04.61Carcinoma in situ of skin of right upper limb, including shoulder
    D04.62Carcinoma in situ of skin of left upper limb, including shoulder
    D04.70Carcinoma in situ of skin of unspecified lower limb, including hip
    D04.71Carcinoma in situ of skin of right lower limb, including hip
    D04.72Carcinoma in situ of skin of left lower limb, including hip
    D04.8Carcinoma in situ of skin of other sites

    Showing 1–20 of 21

    DRG Codes

    4 rows

    DRG CodeDescription
    124Other Disorders of the Eye with MCC or Thrombolytic Agent
    125Other Disorders of the Eye without MCC
    606Minor Skin Disorders with MCC
    607Minor Skin Disorders without MCC

    Typical Clinical Scenarios

    • An elderly patient presents to dermatology with a slowly enlarging, scaly, well-demarcated erythematous patch on the dorsum of the nose that has been present for several months without invasion on biopsy; the clinician performs a punch biopsy confirming carcinoma restricted to the epidermis and discusses definitive excision. A diagnosis from this group is assigned to document in situ squamous cell carcinoma of the skin at a specific facial site. Typical codes: D04.0, D04.111
    • A middle-aged patient with a history of chronic sun exposure attends a primary care visit for routine skin surveillance; multiple suspicious flat pigmented lesions are biopsied and one lesion on the left cheek returns as basal cell carcinoma in situ. Because the lesion is noninvasive and localized, an in situ skin neoplasm code is used for treatment planning and follow-up. Typical codes: D04.21, D04.22
    • A patient with a prior diagnosis of invasive skin cancer presents for management of a new localized noninvasive lesion on the lower limb identified during oncology follow-up; the lesion is excised and pathology shows carcinoma in situ without stromal invasion, considered a separate in situ lesion complicating the cancer history. A specific in situ code is assigned to capture the current noninvasive skin neoplasm as a comorbid finding. Typical codes: D04.62, D04.61

    Related Codes

    D00-CARCINOMA-IN-SITU-ORAL-ESOPHAGUS-STOMACH

    ICD-10-CM Code For Carcinoma In Situ Of Oral Cavity, Esophagus And Stomach: Group Overview

    D01-CARCINOMA-IN-SITU-DIGESTIVE

    ICD-10-CM Code For Carcinoma In Situ Of Other And Unspecified Digestive Organs: Group Overview

    D02-CARCINOMA-IN-SITU-MIDDLE-EAR-RESPIRATORY

    ICD-10-CM Code For Carcinoma In Situ Of Middle Ear And Respiratory System: Group Overview

    D03-MELANOMA-IN-SITU

    ICD-10-CM Code For Melanoma In Situ: Group Overview

    D05-CARCINOMA-IN-SITU-OF-BREAST

    ICD-10-CM Code For Carcinoma In Situ Of Breast: Group Overview

    D06-CARCINOMA-IN-SITU-OF-CERVIX-UTERI

    ICD-10-CM Code For Carcinoma In Situ Of Cervix Uteri: Group Overview

    D07-CARCINOMA-IN-SITU-GENITAL-ORGANS

    ICD-10-CM Code For Carcinoma In Situ Of Other And Unspecified Genital Organs: Group Overview

    D09-CARCINOMA-IN-SITU-OTHER-UNSPECIFIED-SITES

    ICD-10-CM Code For Carcinoma In Situ Of Other And Unspecified Sites: 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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