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1. Check there is no entry in MPI.persons with this person_id

   1. In case error - return 422 (Person_id doesn’t belong to unidentified personpreperson)

2. Convert person_id into patient_id. Check patient_id exists in medical_data.patients collection

   1. In case error - 404

3. Check preperson has status=active

   1. In case error - return 422 (Unidentified person Preperson is not active)

Validate external_id

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