{"result_count":1,"results":[{"addresses":[{"address_1":"9300 DEWITT LOOP","address_purpose":"LOCATION","address_type":"DOM","city":"FORT BELVOIR","country_code":"US","country_name":"United States","postal_code":"220605285","state":"VA","telephone_number":"571-231-1605"},{"address_1":"9300 DEWITT LOOP","address_purpose":"MAILING","address_type":"DOM","city":"FORT BELVOIR","country_code":"US","country_name":"United States","postal_code":"220605285","state":"VA","telephone_number":"571-231-1605"}],"basic":{"certification_date":"2025-05-19","credential":"M.D.","enumeration_date":"2016-02-27","first_name":"MARK","last_name":"NAU","last_updated":"2025-05-19","name_prefix":"Dr.","sex":"M","sole_proprietor":"YES","status":"A"},"created_epoch":"1456590468000","endpoints":[],"enumeration_type":"NPI-1","identifiers":[],"last_updated_epoch":"1747665534000","number":"1033579479","other_names":[],"practiceLocations":[],"taxonomies":[{"code":"207R00000X","desc":"Internal Medicine","license":"D0093781","primary":false,"state":"MD","taxonomy_group":""},{"code":"207RP1001X","desc":"Internal Medicine, Pulmonary Disease","license":"0101271145","primary":false,"state":"VA","taxonomy_group":""},{"code":"207RC0200X","desc":"Internal Medicine, Critical Care Medicine","license":"D0093781","primary":true,"state":"MD","taxonomy_group":""}]}]}