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2008 ICD-9-CM Volume 1 Diagnosis Codes Home > Neoplasms 140-239 > Malignant Neoplasm Of Lip, Oral Cavity, And Pharynx 140-149 > Malignant Neoplasm Of Other And Unspecified Parts Of Mouth 145.* > 2008 ICD-9-CM Diagnosis 145.9 Malignant neoplasm of mouth unspecified  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 Therefore, this code may be out of date.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 145.9 can be accessed here. A malignant tumor involving the oral cavity. The majority are squamous cell carcinomas. -- 2003 145.9 is a specific code that can be used to specify a diagnosis View the ICD-9-CM Volume 1 145.* hierarchy 145.9 also known as: Buccal cavity NOS Minor salivary gland, unspecified site Oral cavity NOS