Proud Member of Loudoun Medical Group. Patient Portal Instructions. ... LSFP has been named Best of Loudoun… AGAIN! Get to Know LSFP ... If you are having a true emergency after hours, visit LMG Cornwall Urgent Care. They have access to all LMG medical records. Patient Portal. Lansdowne (703) 724-7530; Ashburn (571) 252-7353; Leesburg (703 ....