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2008 ICD-9-CM Volume 1 Diagnosis Codes Home > Neoplasms 140-239 > Malignant Neoplasm Of Other And Unspecified Sites 190-199 > Malignant Neoplasm Of Brain 191.* > 2008 ICD-9-CM Diagnosis 191.7 Malignant neoplasm of brain stem  On October 1, 2008 the 2009 ICD-9-CM codes came into effect. Therefore, this code may be out of date. The 2009 version of ICD-9-CM 191.7 can be accessed here. 191.7 is a specific code that can be used to specify a diagnosis View the ICD-9-CM Volume 1 191.* hierarchy 191.7 also known as: Cerebral peduncle Medulla oblongata Midbrain Pons