HIPAASpace NPI Lookup allows you to perform NPI Lookups of doctors & various medical entities for their unique NPI number. The information found on HIPAASpace NPI Lookup is powered by the CMS and provided in accordance with the Data Dissemination Notice. Use HIPAASpace NPI Lookup and provide us feedback. NPI Number Lookup - Search the NPI Registry by name or NPI number. NPI lookup for doctors and other healthcare providers from the NPI Registry. Find a doctor by specialty. Search the NPI registry for doctors and physicians by specialty. Search and browse healthcare providers in the National Provider Identifier ( NPI ) registry. Find doctors, hospitals, medical groups, and other healthcare organizations. Find individual healthcare providers including physicians, nurses, therapists, and other practitioners.