Specific code 2014 ICD-9-CM Diagnosis Code 164.9
Malignant neoplasm of mediastinum, part unspecified
  • Billable Code
  • Short description: Mal neo mediastinum NOS.
  • ICD-9-CM 164.9 will be replaced by an equivalent ICD-10-CM code (or codes) when the United States transitions from ICD-9-CM to ICD-10-CM on October 1, 2015.
  • ICD-9-CM 164.9 is a billable medical code that can be used to specify a diagnosis on a reimbursement claim.
Disease Synonyms
  • Cancer of the mediastinum
  • Mediastinal cancer
  • Primary malignant neoplasm of mediastinum
Clinical Information
  • A primary or metastatic malignant neoplasm affecting the mediastinum. Representative examples of primary malignant mediastinal neoplasms include malignant germ cell tumors, malignant mesenchymal tumors, lymphomas, and malignant peripheral nerve sheath tumors. A representative example of metastatic malignant neoplasm to the mediastinum is the metastatic carcinoma to the mediastinum from another anatomic site.
Convert to ICD-10-CM: 164.9 converts directly to:
  • 2014 ICD-10-CM C38.3 Malignant neoplasm of mediastinum, part unspecified
ICD-9-CM codes are used in medical billing and coding to describe diseases, injuries, symptoms and conditions. ICD-9-CM 164.9 is one of thousands of ICD-9-CM codes used in healthcare. Although ICD-9-CM and CPT codes are largely numeric, they differ in that CPT codes describe medical procedures and services. Can't find a code? Start at the root of ICD-9-CM, check the 2014 ICD-9-CM Index or use the search engine at the top of this page to lookup any code.