ICD 10 CM C84.05 | Description & Clinical Information

ICD 10 C84.05 describes a specific medical condition known as mycosis fungoides (MF) of the lymph nodes in the lower extremity and groin area, which is a type of cutaneous T-cell lymphoma (CTCL) that develops when T cell lymphocytes, a type of white blood cell responsible for fighting infections, undergo abnormal multiplication and accumulation in the outer layer of the skin, resulting in a slow-growing lymphoma that can cause a range of symptoms and complications.

Official Description Of C84.05

The ICD 10 CM book defines ICD 10 code C84.05 as:

Mycosis fungoides, lymph nodes of inguinal region and lower limb
Parent Code Notes: C84.0

Excludes1: peripheral T-cell lymphoma, not elsewhere classified (C84.4-)

Parent Code Notes: C84

Excludes1: personal history of non-Hodgkin lymphoma (Z85.72)

When To Use C84.05

The diagnosis describes by the ICD-10-CM code C84.05 is mycosis fungoides (MF), a rare form of non-Hodgkin’s lymphoma that primarily affects the skin. It is a slow-growing cancer that begins in the white blood cells, known as T-cells, and can eventually spread to other parts of the body, such as the lymph nodes, bone marrow, and internal organs.

Mycosis fungoides manifests as a scaly, red rash on the skin that can last for months or even years, which is known as the premycotic phase. This rash is typically located on the torso and buttocks and gradually worsens until it progresses to a patch phase. During the patch phase, small, thin plaques appear on the skin, often resulting in mild itching.

As the disease advances, it enters the plaque phase, characterized by small, hard, intensely itchy lesions on the skin. If left untreated, it will progress further to the tumor phase, during which painful ulcers may develop, which can easily become infected. It is important to note that the disease rarely progresses beyond the plaque stage.

In cases where MF has spread to the lymph nodes in the lower extremity and inguinal region, patients may experience symptoms such as enlarged lymph nodes, swelling and pain in the lower abdomen and lower extremity, and difficulties in walking.

Diagnosis of mycosis fungoides is based on the patient’s medical history, signs and symptoms, and physical examination. Doctors may take a skin biopsy to examine the cells under a microscope, which forms the basis for diagnosis. Additionally, laboratory tests such as a complete blood cell count, and liver and kidney function tests, as well as tests for antibodies to certain viruses such as HIV and HTLV1, may also be performed.

Imaging studies, such as CT scans or PET scans, are also often used to determine the extent of malignancy and stage the disease. The staging system for mycosis fungoides is based on lymph node involvement and the sites affected.

Treatment options for mycosis fungoides depend on the stage and severity of the disease. Patients with few or no symptoms may not receive treatment but will require regular monitoring. Patients with more advanced disease may be treated with radiation therapy for localized disease, chemotherapy, which might vary from single agent to multiple agents, extracorporeal photopheresis, and allogeneic stem cell transplantation. The choice of treatment will depend on the patient’s age, overall health, and preferences.

Unfortunately, mycosis fungoides has a poor prognosis unless diagnosed at an early stage. Regular follow-up appointments with a doctor are highly recommended for people living with MF to minimize its impact on their daily lives while managing its symptoms. With proper treatment and care, patients can manage the disease and improve their quality of life.

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