{"npi":"1326103151","type":"NPI-1","status":"active","name":{"display":"Maciej Lesniak MD","other":[],"first":"MACIEJ","last":"LESNIAK","middle":"S","credential":"MD"},"specialty":{"primary_taxonomy":"207T00000X","primary_taxonomy_description":"Neurological Surgery Physician","slug":"neurological-surgery-physician","schema_org_specialty":null,"all":[{"code":"207T00000X","description":"Neurological Surgery Physician","primary":true,"state":"IL","license":"036108469"}]},"addresses":[{"purpose":"LOCATION","street_1":"675 N SAINT CLAIR ST","city":"CHICAGO","state":"IL","postal_code":"606115975","country_code":"US","street_2":"GALTER 20-250","phone":"3126958143"},{"purpose":"MAILING","street_1":"680 N LAKE SHORE DR","city":"CHICAGO","state":"IL","postal_code":"606114546","country_code":"US","street_2":"SUITE# 1000","phone":"3126959797","fax":"3126950050"}],"license":{"state":"IL","number":"036108469"},"identifiers":[],"pecos":{"enrolled_at":"2026-05-09T10:41:39.028268+00:00","enrollments":[{"enrlmt_id":"I20031211000730","type_code":"14-14","type_desc":"PRACTITIONER - NEUROSURGERY","state":"IL","pac_id":"1557267267"}]},"enumeration_date":"2006-12-22","last_updated":"2015-11-10","_meta":{"source":"NPPES","snapshot_date":"2015-11-10","doc_url":"https://findmynpi.com/api"}}