Brain Mets ICD-10-CM Codes

Explore ICD-10 codes used for Brain Mets, including description and billability. Learn more with Carepatron’s short guide.

By Patricia Buenaventura on Aug 8, 2025.

Fact Checked by Ericka Pingol.

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What ICD-10 Codes are Used for Brain Mets?

Brain Mets or brain metastases are brain tumors that form due to cancer cells that have traveled from organ/s in the body, usually ones with existing tumors, to the brain.

If your patient has brain metastases, here are the ICD codes for Brain Mets that you can use for billing and coding:

C71.9: Malignant neoplasm of brain, unspecified
C79.31: Secondary malignant neoplasm of brain

Which Brain Mets ICD codes are Billable?

All of the mentioned ICD-10 codes for Brain Mets are billable.

Clinical Information

Brain Mets, or brain metastases, are tumors that begin somewhere in the body that’s spread to the brain. The timing of their appearance may vary. It may appear before or after the primary cancer.
Common symptoms of brain mets are seizures, headaches, weakness in the legs and arms, loss of memory/balance/hearing, problems talking, changes in personality/behavior, numbness, and blurred vision.
Those who are likely to develop brain mets are those who have any other type of cancer. In addition, as the patient ages, their risk of developing brain mets increases.
To diagnose brain mets, practitioners may ask the patient to undergo a physical exam, neurological exam, imaging tests, and a biopsy.
Treatment may include surgery, chemotherapy, radiation therapy, immunotherapy, and drug treatments. The chosen treatment will depend on the location of the tumor, the patient’s health, the exhibited symptoms, and the type of cancer the patient has/hand.

Synonyms Include:

Secondary malignant neoplasm of brain
Anaplastic astrocytoma of brain
Carcinoma of brain
Ependymoma of brain
Giant cell glioblastoma of brain

Commonly asked questions

You can use a brain mets ICD code when you’ve determined the nature of the patient’s malignant neoplasm in the brain.

Yes, the two common ICD-10 codes commonly used for brain mets are billable.

Common treatments include surgery, chemotherapy, radiation therapy, immunotherapy, and drug treatments.

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