Crohn's and Ulcerative colitits

Ashwin et al., Discussed the AUC for UC and Crohn's with NLP and codified data. In this domain, once the cohort is roughly identified with the ICD-9 codes (low specificity), the NLP terms are much better than the codified terms in accurately identifying who has disease and who does not (as measured by AUC). Based on these analyses, it looks like PHS has 12000 (UC + Crohn's) of which about 3600 samples can be accumulated in one year.