This codelist aims to identify gastrointestinal surgeries resulting in malabsorption of vitamin D. It is developed for the purpose of the vitamin D study (indications for vitamin D testing/ prescribing).

This codelist identifies malabsorption syndromes. It is designed for the purpose of the vitamin D study (indications for vit. D testing/ prescribing) and therefore focused on the malabsorption of lipids.

To be used correctly and cover all potential causes of malabsorption, this codelist should be used alongside the following codelists: Coeliac disease, Crohn's disease, Cystic Fibrosis, Pancreatic Insufficiency, Malabsorption due to gastrointestinal surgery.

This codelist defines pancreatic insufficiency to define malabsorption disorders for the purpose of the vitamin D study.
For this reason, it focuses on exocrine insufficiency of lipid absorption, as opposed to endocrine insufficiency (diabetes is not included by default).

This codelist is designed to be a sensitive codelist to identify a broad range of medication reviews being undertaken.

dm+d codelist for mercaptopurine

dm+d codelist for oral methotrexate

dm+d codelist for injectable methotrexate

[BNF codelist](https://www.thedatalab.org/blog/161/prescribing-data-bnf-codes/) for oral methotrexate.

pseudoBNF codelist for methylphenidate

dm+d codelist for methylphenidate