CoWIN: 4 Digit Code Introduced to Accurately Record Citizens' Vaccination Status The Union Health Ministry has introduced an additional feature in the CoWIN app in an attempt to ensure an accurate record of the vaccination status of the citizens. | 7 May 2021 11:27 AM GMT New Delhi- The Union Health Ministry has introduced an additional feature in the CoWIN app in an attempt to ensure an accurate record of the vaccination status of the citizens. The vaccinators will now ask for a four-digit security code from the people who have registered via the CoWIN app to mark them as "vaccinated' once they get administered the dose.