ICD10-CM Case Sensitivity

[laurakwiley]

Hi Robert & Team -

Just an FYI that in the new ICD10-CM mapping tables there is a case-sensitivity issue for codes that have an "X" in the middle of the code. Although under ICD10-CM formatting this is an uppercase X, in the phemap dataset they are lowercase. Ran into this issue when a collaborator was investigating open angle glaucoma and we didn't have accurate PheCodes.

See:
PheWAS::phecode_map %>% filter(str_detect(phecode, '365.11') & vocabulary_id == 'ICD10CM')
for an example.

Based on our troubleshooting looks like simply transforming with a toupper command on the phecode_map table fixes the issue.

That said, we very much appreciate the new mappings!

Laura