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Edit this profileWhere to find John F. Grehan, MD PHD
- Sioux Falls location main office
1301 W 18Th St, Sioux Falls, SD 57105 - Saint Paul location
225 N Smith Ave, #100A, Saint Paul, MN 55102
About Dr. Grehan
John F. Grehan, MD PHD practices thoracic surgery in Sioux Falls, SD. John is a 1995 graduate of University of Minnesota Medical School. John is also listed as specializing in thoracic surgery (cardiothoracic). According to Medicare claims data, John cared for 258 Medicare patients across 258 services. The services billed most often include replacement of aortic valve through the skin and femoral artery, initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes, and new patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more. The provider's National Provider Identifier (NPI) is 1275549784.
Factual summary compiled by Guide.md from public records; not written by this provider.
Education & Training
Specialty
Credentials & Licensing
Medicare information
Exactly as CMS reports it (National Downloadable File, Opt-Out Affidavits, Order & Referring). Not an insurance directory; confirm coverage with the office.
Contact Information
- (605) 312-2100
- Email not available
Practice Locations
1301 W 18TH ST
Sioux Falls, SD 57105
225 N Smith Ave #100A
Saint Paul, MN 55102
Conditions Commonly Evaluated or Treated
Within Thoracic Surgery generally. Availability varies by clinician, training and location — this profile has not been claimed, so nothing here is a personal claim by the provider.
Conditions
Airway
Chest tumors
Chest wall
Diaphragm
Esophagus
Esophagus and stomach
- Acid reflux
- Barrett's esophagus
- Esophageal cancer
- Esophageal pouch
- Esophagus tear
- Hiatal hernia
- Swallowing difficulties
Heart lining
Infection
Lung
Lung cancer
Lung conditions
Nerves
Nerves and blood vessels
Neuromuscular
Pleural disease
Sweating disorders
Trauma
Vascular
Procedures & services
Airway
Airway surgery
Chest tumors
Chest wall
Chest wall surgery
- Broken rib plating surgery
- Chest wall reconstruction
- Sunken chest repair
- Thoracic Outlet Decompression
Diagnostic tests
Diagnostics
Diaphragm
Diaphragm surgery
Emphysema
Esophagus
Esophagus surgery
- Acid reflux surgery
- Esophageal dilation
- Esophageal stent placement
- Esophagus removal surgery
- Hiatal hernia surgery
- Peroral endoscopic myotomy
Fluid drainage
Heart lining
Lung surgery
- Collapsed lung surgery
- Lung cancer surgery
- Lung lining scraping and cleaning
- Lung nodule removal
- Lung valve placement for emphysema
- Minimally invasive lung surgery
Nerves
Pleural disease
Robotic surgery
Surgical approach
Sweat surgery
Transplant
Trauma
Procedures Most Often Billed to Medicare
258 services · 258 patients · 10 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Replacement of aortic valve through the skin and femoral artery | Procedure | 33361 |
74 | More than most peers in Thoracic Surgery |
| Coronary artery bypass using artery graft, 1 graft | Procedure | 33533 |
26 | More often than most peers in Thoracic Surgery |
| Harvest of vein using an endoscope | Procedure | 33508 |
26 | More often than most peers in Thoracic Surgery |
| Exclusion of appendage of left upper chamber of heart performed during other procedure on chest | Procedure | 33268 |
19 | As often as other peers in Thoracic Surgery |
| Coronary artery bypass using vein or artery graft, 2 grafts | Procedure | 33518 |
15 | As often as other peers in Thoracic Surgery |
| Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | Office visit | 99223 |
29 | More often than most peers in Thoracic Surgery |
| New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more | Office visit | 99205 |
27 | As often as other peers in Thoracic Surgery |
| Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes | Office visit | 99222 |
16 | As often as other peers in Thoracic Surgery |
| New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more | Office visit | 99204 |
13 | As often as other peers in Thoracic Surgery |
| New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more | Office visit | 99204 |
13 | As often as other peers in Thoracic Surgery |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Other thoracic surgeons at this location 1
Same specialty, same street address — most likely the same department or group.
Related specialists at this location 3
Clinically related specialties at the same address — the people this provider most likely works alongside.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
More connections — 17 related providers in 3 groups
Other thoracic surgeons in Sioux Falls 2
Same specialty, same city.
Trained at University of Minnesota Medical School 7
Other providers in the same specialty who trained at the same institution.
Class of 1995 at University of Minnesota Medical School 8
Providers who graduated from the same medical school in the same year.
Common questions
What does Dr. Grehan specialize in?
Dr. Grehan is a thoracic surgeon in Sioux Falls, SD. That is the designation recorded for this NPI in the federal registry, where it is listed as “Thoracic Surgery”.
NPI registry
Where is Dr. Grehan located?
Dr. Grehan is listed at 1301 W 18Th St, Sioux Falls, SD 57105. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
What is Dr. Grehan's phone number?
The number on file is (605) 312-2100. Contact the office directly to confirm availability and scheduling.
NPI registry
What is Dr. Grehan's NPI number?
Dr. Grehan's National Provider Identifier is 1275549784. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
Where did Dr. Grehan go to medical school?
Dr. Grehan attended University of Minnesota Medical School, graduating in 1995. This comes from the CMS National Downloadable File.
CMS public data
How long has Dr. Grehan been practicing?
Dr. Grehan has 31 years experience. Calculated from a graduation year of 1995, reported in the CMS National Downloadable File.
CMS public data
What does Dr. Grehan do most often?
According to Medicare billing data, Dr. Grehan performs procedures including replacement of aortic valve through the skin and femoral artery, coronary artery bypass using artery graft, 1 graft and harvest of vein using an endoscope, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Has Dr. Grehan confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. Grehan. If this is you, claiming it is free.
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