Answer: A
C03.0 is the correct code for this case because it codes for malignant neoplasm of upper gums. The swelling is present on the upper gums for the past 2 years and after biopsy, it represents the malignant neoplasm.
Option B is not correct because C03.1 is used to code for malignant neoplasm of lower gums.
Option C is not correct because C05.2 is used to code for malignant neoplasm of the uvula.
Option D is not correct because C05.1 is used to code for malignant neoplasm of the soft palate.