2021 ICD-10-CM Code D04.9

Carcinoma in situ of skin, unspecified

Version 2021

Valid for Submission

D04.9 is a billable diagnosis code used to specify a medical diagnosis of carcinoma in situ of skin, unspecified. The code D04.9 is valid during the fiscal year 2021 from October 01, 2020 through September 30, 2021 for the submission of HIPAA-covered transactions.

The ICD-10-CM code D04.9 might also be used to specify conditions or terms like actinic intraepidermal squamous cell carcinoma, basal cell carcinoma of skin in situ, bowen's disease, atrophic, bowen's disease, clear cell, bowen's disease, clonal , bowen's disease, pagetoid, etc.

The following anatomical sites found in the Table of Neoplasms apply to this 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.

ICD-10:D04.9
Short Description:Carcinoma in situ of skin, unspecified
Long Description:Carcinoma in situ of skin, unspecified

Code Classification

Index to Diseases and Injuries

The Index to Diseases and Injuries is an alphabetical listing of medical terms, with each term mapped to one or more ICD-10 code(s). The following references for the code D04.9 are found in the index:

Approximate Synonyms

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

Convert D04.9 to ICD-9 Code

The General Equivalency Mapping (GEM) crosswalk indicates an approximate mapping between the ICD-10 code D04.9 its ICD-9 equivalent. The approximate mapping means there is not an exact match between the ICD-10 code and the ICD-9 code and the mapped code is not a precise representation of the original code.

Table of Neoplasms

The code D04.9 is included 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
Primary
Malignant
Secondary
CaInSitu Benign Uncertain
Behavior
Unspecified
Behavior
»Neoplasm, neoplastic
  »connective tissue NEC
    »skin (dermis) NEC [See Also: Neoplasm, skin, by site]
C44.90C79.2D04.9D23.9D48.5D49.2
»Neoplasm, neoplastic
  »nail [See Also: Neoplasm, skin, limb]
C44.90C79.2D04.9D23.9D48.5D49.2
»Neoplasm, neoplastic
  »scar NEC [See Also: Neoplasm, skin, by site]
C44.90C79.2D04.9D23.9D48.5D49.2
»Neoplasm, neoplastic
  »skin NOS
C44.90C79.2D04.9D23.9D48.5D49.2
»Neoplasm, neoplastic
  »skin NOS
    »limb NEC
C44.90C79.2D04.9D23.9D48.5D49.2
»Neoplasm, neoplastic
  »sudoriferous, sudoriparous gland, site unspecified
C44.90C79.2D04.9D23.9D48.5D49.2
»Neoplasm, neoplastic
  »sweat gland (apocrine) (eccrine), site unspecified
C44.90C79.2D04.9D23.9D48.5D49.2

Information for Patients


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

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 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 (First year ICD-10-CM implemented into the HIPAA code set)