Demographic Differences and Disparities in the Misdiagnosis of Interstitial Cystitis/Bladder Pain Syndrome in a National Cohort of VA Patients.

Objective: To explore association between misdiagnosis of IC/BPS and demographics. Interstitial cystitis/bladder pain syndrome (IC/BPS) is associated with significant diagnostic uncertainty, resulting in frequent misdiagnosis as there is little known about the potential impact of key demographic factors.

Methods: All patients in the VA system between 1999-2016 were identified by ICD-9/10 codes for IC/BPS (595.1/N30.10) (n = 9,503). ICD code accuracy for true IC/BPS (by strict criteria) was assessed by in-depth chart abstraction (n = 2,400). Associations were explored between rates of misdiagnosis and demographics.

Results: IC/BPS criteria were met in only 651 (48.8%) of the 1,334 charts with an ICD code for IC/BPS reviewed in depth. There were no differences in the misdiagnosis rate by race (P=.27) or by ethnicity (P=.97), after adjusting for differences in age and gender. In IC/BPS-confirmed cases, female patients were diagnosed at a younger age than males (41.9 vs. 58.2 years, P<.001). Black and Hispanic patients were diagnosed at a younger age compared to White (41.9 vs. 50.2 years, P<.001) and non-Hispanic patients, respectively (41.1 vs. 49.1 years, P=.002).

Conclusion: There was a high rate of misdiagnosis of IC/BPS overall, with only 48.8% of patients with an ICD code for IC/BPS meeting diagnostic criteria. There were no significant associations between diagnostic accuracy and race/ethnicity. Black and Hispanic patients were more likely to receive a diagnosis of IC/BPS at a younger age, suggesting there may be differing natural histories or presentation patterns of IC/BPS between racial/ethnic groups.