atc code v01 atc code v01 atc code v01 allergens is a therapeutic subgroup of the anatomical therapeutic chemical classification system, a system of alphanumeric codes developed by the world health organization (who) for the classification of drugs and other medical products. subgroup v01 is part of the anatomical group v various. atc codes v various v01 allergens v03 all other therapeutic products v04 diagnostic agents v06 general nutrients v07 all other non-therapeutic products v08 contrast media v09 diagnostic radiopharmaceuticals v10 therapeutic radiopharmaceuticals v20 surgical dressings a b c d g h qi j l m n p r s v codes for veterinary use (atcvet codes) can be created by placing the letter q in front of the human atc code: for example, qv01. national issues of the atc classification may include additional codes not present in this list, which follows the who version. v01a allergens v01aa allergen extracts v01aa01 feather v01aa02 grass pollen v01aa03 house dust mites v01aa04 mould fungus and yeast fungus v01aa05 tree pollen v01aa07 insects v01aa08 food v01aa09 textiles v01aa10 flowers v01aa11 animals v01aa20 various