2024 ICD-10-CM Diagnosis Code D04.9

Carcinoma in situ of skin, unspecified

ICD-10-CM Code:
ICD-10 Code for:
Carcinoma in situ of skin, unspecified
Is Billable?
Yes - Valid for Submission
Chronic Condition Indicator: [1]
Not chronic
Code Navigator:

Code Classification

D04.9 is a billable diagnosis code used to specify a medical diagnosis of carcinoma in situ of skin, unspecified. The code is valid during the current fiscal year for the submission of HIPAA-covered transactions from October 01, 2023 through September 30, 2024.

The following anatomical sites found in the Table of Neoplasms reference this diagnosis code given the correct histological behavior: Neoplasm, neoplastic connective tissue NEC skin (dermis) NEC [See Also: Neoplasm, skin, by site] ; Neoplasm, neoplastic nail [See Also: Neoplasm, skin, limb] ; Neoplasm, neoplastic scar NEC [See Also: Neoplasm, skin, by site] ; Neoplasm, neoplastic skin NOS ; Neoplasm, neoplastic skin NOS limb NEC ; Neoplasm, neoplastic sudoriferous, sudoriparous gland, site unspecified ; Neoplasm, neoplastic sweat gland (apocrine) (eccrine), site unspecified ; etc

Unspecified diagnosis codes like D04.9 are acceptable when clinical information is unknown or not available about a particular condition. Although a more specific code is preferable, unspecified codes should be used when such codes most accurately reflect what is known about a patient's condition. Specific diagnosis codes should not be used if not supported by the patient's medical record.

Approximate Synonyms

The following clinical terms are approximate synonyms or lay terms that might be used to identify the correct diagnosis code:

  • Basal cell carcinoma of skin in situ
  • Bowen's disease, atrophic
  • Bowen's disease, clear cell
  • Bowen's disease, clonal
  • Bowen's disease, pagetoid
  • Bowen's disease, pigmented
  • Bowen's disease, psoriasiform
  • Bowen's disease, verrucous
  • Carcinoma in situ of adnexa of skin
  • Carcinoma in situ of sebaceous gland
  • Carcinoma in situ of skin
  • Carcinoma in situ of surface epithelium
  • Carcinoma in situ of sweat gland
  • Multiple intraepidermal squamous carcinomata
  • Squamous cell carcinoma in situ of skin
  • Squamous cell carcinoma in situ of skin caused by sunlight

Clinical Classification

Index to Diseases and Injuries References

The following annotation back-references for this diagnosis code are found in the injuries and diseases index. The Index to Diseases and Injuries is an alphabetical listing of medical terms, with each term mapped to one or more ICD-10-CM code(s).

Convert D04.9 to ICD-9-CM

  • ICD-9-CM Code: 232.9 - Ca in situ skin NOS
    Approximate Flag - The approximate mapping means there is not an exact match between the ICD-10 and ICD-9 codes and the mapped code is not a precise representation of the original code.

Table of Neoplasms

This code is referenced in the table of neoplasms by anatomical site. For each site there are six possible code numbers according to whether the neoplasm in question is malignant, benign, in situ, of uncertain behavior, or of unspecified nature. The description of the neoplasm will often indicate which of the six columns is appropriate.

Where such descriptors are not present, the remainder of the Index should be consulted where guidance is given to the appropriate column for each morphological (histological) variety listed. However, the guidance in the Index can be overridden if one of the descriptors mentioned above is present.

Neoplasm, neoplastic Malignant
CaInSitu Benign Uncertain
»Neoplasm, neoplastic
  »connective tissue NEC
    »skin (dermis) NEC [See Also: Neoplasm, skin, by site]
»Neoplasm, neoplastic
  »nail [See Also: Neoplasm, skin, limb]
»Neoplasm, neoplastic
  »scar NEC [See Also: Neoplasm, skin, by site]
»Neoplasm, neoplastic
  »skin NOS
»Neoplasm, neoplastic
  »skin NOS
    »limb NEC
»Neoplasm, neoplastic
  »sudoriferous, sudoriparous gland, site unspecified
»Neoplasm, neoplastic
  »sweat gland (apocrine) (eccrine), site unspecified

Patient Education

Skin Cancer

Skin cancer is the most common form of cancer in the United States. The two most common types are basal cell cancer and squamous cell cancer. They usually form on the head, face, neck, hands, and arms. Another type of skin cancer, melanoma, is more dangerous but less common.

Anyone can get skin cancer, but it is more common in people who :

  • Spend a lot of time in the sun or have been sunburned
  • Have light-colored skin, hair and eyes
  • Have a family member with skin cancer
  • Are over age 50

You should have your doctor check any suspicious skin markings and any changes in the way your skin looks. Treatment is more likely to work well when cancer is found early. If not treated, some types of skin cancer cells can spread to other tissues and organs. Treatments include surgery, radiation therapy, chemotherapy, photodynamic therapy (PDT), and biologic therapy. PDT uses a drug and a type of laser light to kill cancer cells. Biologic therapy boosts your body's own ability to fight cancer.

NIH: National Cancer Institute

[Learn More in MedlinePlus]

Code History

  • FY 2024 - No Change, effective from 10/1/2023 through 9/30/2024
  • FY 2023 - No Change, effective from 10/1/2022 through 9/30/2023
  • FY 2022 - No Change, effective from 10/1/2021 through 9/30/2022
  • FY 2021 - No Change, effective from 10/1/2020 through 9/30/2021
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016. This was the first year ICD-10-CM was implemented into the HIPAA code set.


[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.