Renal Mass ICD-10-CM Codes | 2023

Check out our short guide to ICD-10 codes used for renal mass to learn more about them, their billability, and clinical information on possible diagnoses.

By Harriet Murray on Aug 8, 2025.

Fact Checked by Nate Lacson.

Use Code

What ICD-10 Codes are Used for Renal Mass?

Here are the numerous Renal Mass ICD codes you can use when coding or billing, depending on the mass the test may reveal.

Malignant Neoplasm

C64: Malignant neoplasm of kidney, except renal pelvis
C64.1: Malignant neoplasm of right kidney, except renal pelvis
C64.2: Malignant neoplasm of left kidney, except renal pelvis
C64.9: Malignant neoplasm of unspecified kidney, except renal pelvis
C65: Malignant neoplasm of renal pelvis
C65.1: Malignant neoplasm of right renal pelvis
C65.2: Malignant neoplasm of left renal pelvis
C65.9: Malignant neoplasm of unspecified renal pelvis

Neoplasm

D41.0: Neoplasm of uncertain behavior or unspecified kidney
D41.00: Neoplasm of uncertain behavior or unspecified kidney
D41.01: Neoplasm of undertain behavior of right kidney
D41.02: Neoplasm of uncertain behavior or left kidney
D41.1: Neoplasm of uncertain behavior of renal pelvis
D41.10: Neoplasm of uncertain behavior of unspecified renal pelvis
D41.11: Neoplasm of uncertain behavior of right renal pelvis
D41.12: Neoplasm of uncertain behavior of left renal pelvis
D49.51: Neoplasm of unspecified behavior of kidney
D49.511: Neoplasm of unspecified behavior of right kidney
D49.512: Neoplasm of unspecified behavior of left kidney
D49.519: Neoplasm of unspecified behavior of unspecified kidney

Benign Neoplasm

D30.0: Benign neoplasm of kidney
D30.00: Benign neoplasm of unspecified kidney
D30.01: Benign neoplasm of right kidney
D30.02: Benight neoplasm of left kidney
D30.1: Benign neoplasm of renal pelvis
D30.10: Benign neoplasm of unspecified renal pelvis
D30.11: Benign neoplasm of right renal pelvis
D30.12: Benign neoplasm of left renal pelvis

Which Renal Mass ICD codes are Billable?

The more specific codes under C64, C65, D41.0, D41.1, D49.51, D30.0, D31.1 are billable. However, the aforementioned codes aren’t billable due to the lack of specificity.

Clinical Information

A renal mass is an abnormal growth in the renal cortex or the kidney that can be cancerous (malignant) or not cancerous (benign).
There are multiple types of renal tumors, but the main ones are renal cell carcinomas, benign renal tumors, and Wilms tumors. What differentiates them from one another are location, size, and the age of the patient.
Patients don’t usually exhibit symptoms until the mid to late stages, so these tumors are usually found by chance during the early stages. However, if a patient has any symptoms, they would be the following: blood in urine, loss of appetite, unexplained weight loss, anemia, low back pain on one side, and fever not caused by an infection for an extended period.
People at risk of developing tumors in the kidney are those who smoke, are obese, drink a lot of alcohol, have a family history of high blood pressure/kidney cancer, are constantly exposed to chemicals, and are undergoing kidney dialysis.
To diagnose a renam mass, a practitioner will ask for a patient’s medical history, conduct a physical exam and have them undergo other tests like CMP, CBC, urinalysis, kidney function tests, and imaging tests.
Treatment will vary depending on the size, stage, and profession. Some usual treatments are active surveillance, nephrectomy, and ablation.

Synonyms Include:

Nephroblastoma
Metastatic renal cell carcinoma
Sarcoma of kidney
Bilateral neoplasm of kidneys
Mesoblastic nephroma

Commonly asked questions

You can use a renal mass ICD code when tests have confirmed that there’s a mass in the renal cortex.

Most of the specific renal mass ICD-codes are billable.

Common treatments for renal mass diagnosis codes are ablation, nephrectomy, and active surveillance.

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