Dr. Mark Nielsen M.D.
About this NPIWhat this record shows.
NPI 1922056894 is registered to Dr. Mark Nielsen M.D., a Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician practising at 4630 Singing Hills Blvd, Suite A in Sioux City, Iowa. Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician is a recognised medical specialty under the National Uniform Claim Committee (NUCC) taxonomy. Dr. Mark Nielsen M.D. has been enumerated in the National Provider Identifier (NPI) registry since 2006.
Your brand here.
Insurance & acceptsHow to confirm coverage.
The National Plan and Provider Enumeration System (NPPES) registry does not include commercial insurance network data, so we cannot show which plans Dr. Mark Nielsen M.D. accepts. To confirm in-network status with your specific health plan, contact Dr. Mark Nielsen M.D. directly at (712) 271-8346.
Frequently asked
Yes. NPI 1922056894 is registered as Active in the CMS NPPES public registry and passes the Luhn check-digit validation that all 10-digit NPIs use.
Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician is a recognised medical specialty under the National Uniform Claim Committee (NUCC) taxonomy.
The CMS NPPES Public Registry at npiregistry.cms.hhs.gov is the authoritative source. FindMyNPI mirrors this dataset and refreshes monthly. For real-time verification, you can also call the provider's office at (712) 271-8346.
An individual healthcare provider has a single Type-1 NPI for life. Organisations can hold separate Type-2 NPIs per location, specialty, or sub-entity. Dr. Mark Nielsen M.D. is a Type-1 individual NPI.