Many mid-size hospitals run separate systems for admissions, pharmacy dispensing and billing — often because each was bought at a different point in the hospital's growth. The cost shows up as re-entry: the same patient name, ID and insurance details typed three or four times per visit, with every retype a chance for a mismatch.
One identity, one record
A unified patient identity means a registration at the front desk is immediately visible to pharmacy and billing — no re-keying, no reconciling three systems at month end. Role-based access keeps clinical staff seeing clinical data and finance staff seeing billing data, without either team needing its own separate system.
Migrating without losing history
The safest path is a de-duplication pass across all legacy systems before go-live, migrating merged records once, then running the old systems read-only for a month as a safety net.