John Grehan MD PHD
About this NPIWhat this record shows.
NPI 1275549784 is registered to John Grehan MD PHD, a Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician practising at 1301 W 18th St in Sioux Falls, South Dakota. Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician is a recognised medical specialty under the National Uniform Claim Committee (NUCC) taxonomy. John Grehan MD PHD has been enumerated in the National Provider Identifier (NPI) registry since 2006.
Your brand here.
Medicare enrollment
This provider holds 2 Medicare enrollments on file with the Provider Enrollment, Chain and Ownership System (PECOS). Each enrollment carries a public Medicare Enrollment ID (ENRLMT_ID) used by billers and intermediaries.
Practitioner
- I20080827000719Cardiac SurgeryMN
- I20220412001635Thoracic SurgerySD
Source: CMS PECOS public enrollment file.
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 John Grehan MD PHD accepts. To confirm in-network status with your specific health plan, contact John Grehan MD PHD directly at (605) 312-2100.
Frequently asked
Yes. NPI 1275549784 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 (605) 312-2100.
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. John Grehan MD PHD is a Type-1 individual NPI.