Dx code for prophylactic B12 prior to chemotherapy

Has anyone found a valid ICD-9 code for giving B12 prior to Alimta to prevent/lessen chemo-induced anemia? We found V07.9 for other prophylactic measure (?)

re: Dx code for prophylactic B12 prior to chemotherapy

Aetna: Vitamin B-12 supplementation is considered medically necessary for members taking pralatrexate.
http://www.aetna.com/cpb/medical/data/700_799/0740.html
Here they are coding disease