MR. CHRISTOPHER GREGORY MD
NPI 1821050212
Radiology - Diagnostic Radiology in Sioux Falls, SD

Q: What is Christopher Gregory's NPI number?

The NPI number for Christopher Gregory is 1821050212. It was assigned to this individual provider in the NPPES registry on April 3, 2006.

Q: What is Christopher Gregory's specialty?

The primary specialty registered for this NPI is Radiology, specializing in Diagnostic Radiology, with taxonomy code 2085R0202X.

Active since April 03, 2006PECOS EnrolledAccepts Medicare Assignment

1325 S. CLIFF AVE, SIOUX FALLS, SD 57105(605) 322-7510(605) 322-6475 Get Directions Write a Review

NPPES record last updated: October 17, 2018. Verified against the NPPES registry weekly; last sync: October 18, 2026.

On this page

About Mr. Christopher Gregory Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

MR. CHRISTOPHER GREGORY MD (NPI 1821050212) is an individual diagnostic radiology provider in Sioux Falls, South Dakota, licensed in South Dakota (5278) and active in the NPI registry since April 2006. He is enrolled in Medicare PECOS, is affiliated with Avera Marshall Regional Medical Ctr, and is a graduate of Johns Hopkins University School Of Medicine (1985).

NPPES Registry Identity

NPI1821050212

Entity TypeIndividualMale

Primary Taxonomy2085R0202X

Provider Legal NameMR. CHRISTOPHER GREGORYCredential: MD

Location Address1325 S. CLIFF AVESioux Falls, SD 57105-3762

Mailing AddressPo Box 86370Sioux Falls, SD 57118-6370 · (605) 322-7510 · Fax (605) 322-6475

Phone(605) 322-7510

Fax(605) 322-6475

Sole ProprietorNo

Medical School CMSJohns Hopkins University School Of MedicineGraduated 1985

Enumeration DateApril 3, 2006

Last NPPES UpdateOctober 17, 2018

✔ NPI 1821050212 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyRadiology · Diagnostic RadiologyAllopathic & Osteopathic Physicians

Taxonomy Code2085R0202X

License✔ Licensed in SD · 5278

Definition

A radiologist who utilizes x-ray, radionuclides, ultrasound and electromagnetic radiation to diagnose and treat disease.

1325 S. CLIFF AVE, Sioux Falls, SD 57105

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Other Identifiers 2

Medicaid7200890SD

Medicaid7200895SD

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter from Sunflower Health Plan, Ambetter Health, Ambetter Health of Delaware and more.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Mr. Christopher Gregory Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID3971498544

PECOS Enrollment IDI20040220001092, I20071106000268

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

Medicare enrollment records show Christopher Gregory reassigns Medicare billing to 8 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Avera Mckennan

Same address

Diagnostic Radiology

1325 S CLIFF AVE
Sioux Falls, SD 57105

Reassigned Medicare billing, Minnesota and South Dakota enrollments
75 clinicians in this Medicare group

NPI 1053680678 (605) 322-1600

Urology Specialists Chartered

3.2 mi

Urology

201 W 69TH ST
Sioux Falls, SD 57108

Reassigned Medicare billing, South Dakota enrollment
43 clinicians in this Medicare group

NPI 1881647246 (605) 336-0635

Freeman Regional Health Services

28 mi

Rural Health

307 E STATE ST
Marion, SD 57043

Reassigned Medicare billing, South Dakota enrollment
Also billed through NPI 1003818006 (South Dakota)
36 clinicians in this Medicare group

NPI 1740570076 (605) 648-3559

Avera Queen Of Peace

36 mi

Rural Health

741 S HILL ST
Salem, SD 57058

Reassigned Medicare billing, South Dakota enrollment
227 clinicians in this Medicare group

NPI 1619201829 (605) 425-3038

Madison Community Hospital

37 mi

Critical Access

323 SW 10TH ST
Madison, SD 57042

Reassigned Medicare billing, South Dakota enrollment
84 clinicians in this Medicare group

NPI 1588644058 (605) 256-6551

Avera Tyler

55 mi

Rural Health

109 E BENTON ST
Lake Benton, MN 56149

Reassigned Medicare billing, Minnesota enrollment
Also billed through NPI 1801840517 (Minnesota)
52 clinicians in this Medicare group

NPI 1003869892 (507) 368-4323

Avera Marshall

56 mi

Optometrist

702 10TH ST
Worthington, MN 56187

Reassigned Medicare billing, Minnesota and South Dakota enrollments
Also billed through NPI 1568401016 (Minnesota), NPI 1962641936 (South Dakota)
260 clinicians in this Medicare group

NPI 1417378555 (507) 376-5535

Avera Granite Falls

106 mi

Family Medicine

345 10TH AVE
Granite Falls, MN 56241

Reassigned Medicare billing, Minnesota enrollment
82 clinicians in this Medicare group

NPI 1700429644 (320) 564-3111

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims 58

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

X-ray of chest, 1 view 71045

A chest X-ray, 1 view, is a quick, painless test that produces images of the structures within your chest, such as your heart, lungs, and blood vessels. It helps in diagnosing conditions like pneumonia, heart problems, or lung cancer. You'll stand in front of a machine that emits X-rays, which pass through your body to create the image.

518 services456 patients

Nuclear medicine study from skull base to mid-thigh with ct scan 78815

A nuclear medicine study from skull base to mid-thigh with a CT scan involves using a small amount of radioactive material and CT imaging to examine body tissues and organs. This helps detect any abnormalities by providing detailed images of the body's internal structure.

312 services281 patients

X-ray of chest, 2 views 71046

A chest X-ray, 2 views, is a quick, painless test that creates pictures of the structures inside your chest, such as your heart, lungs, and blood vessels. Two different angles are used to get a comprehensive view. This helps in diagnosing conditions like pneumonia, heart problems, or lung cancer.

149 services145 patients

Ct scan head or brain without contrast 70450

A CT scan of the head or brain without contrast is a non-invasive imaging procedure. It uses X-rays to create detailed pictures of your brain, skull, and other structures inside your head. It helps to detect conditions like strokes, tumors, or injuries. No dye (contrast) is used in this test.

135 services131 patients

Ct scan of abdomen and pelvis with contrast 74177

A CT scan of the abdomen and pelvis with contrast is an imaging procedure. A special dye, called contrast, is used to make certain areas more visible. This can help identify issues such as infections, tumors, or other abnormalities. The procedure is painless and usually takes about 30 minutes.

134 services132 patients

Nuclear medicine studies of heart muscle at rest and with stress and spect 78452

Nuclear medicine studies of the heart involve two parts: rest and stress. During rest, images are taken of your heart at ease. During stress, images are taken after exercise or medication-induced stress. SPECT is a special imaging technique providing 3D pictures of your heart, helping identify any issues.

129 services129 patients

X-ray of chest, 2 views 71046

100 services100 patients

Ct scan of chest with contrast 71260

A CT scan of the chest with contrast is an imaging procedure. A special dye (contrast) is used to highlight specific areas in your body, providing clearer pictures of your chest. This helps in diagnosing conditions related to your lungs, heart, and other chest structures.

81 services80 patients

X-ray of abdomen, 1 view 74018

An X-ray of the abdomen, 1 view, is a quick and painless imaging test. It uses a small amount of radiation to produce images of the structures in your abdomen, such as the stomach, liver, and intestines. This can help identify issues like blockages, infections, or injuries.

73 services71 patients

Ct scan of blood vessels of chest with contrast 71275

A CT scan of the chest with contrast is a non-invasive imaging test. It uses X-rays and a special dye to get detailed images of your blood vessels in the chest. This helps in diagnosing conditions related to heart and lungs.

62 services61 patients

Low dose ct scan of chest for lung cancer screening 71271

A low-dose CT scan of the chest is a quick, painless procedure that uses a small amount of radiation to create detailed images of your lungs. It's a key tool for early detection of lung cancer, especially for those at high risk.

59 services59 patients

Dxa bone density measurement of hip, pelvis, spine 77080

A DXA bone density measurement is a simple, quick, and non-invasive procedure that assesses the strength of your bones. This test uses X-rays to measure the amount of minerals, mainly calcium, in the hip, pelvis, and spine. It helps in early detection of osteoporosis or other bone diseases.

58 services58 patients

Nuclear medicine study of bone and/or joint whole body 78306

A nuclear medicine study of bone and/or joint whole body involves injecting a small amount of radioactive material into your body. This material travels to your bones and emits energy. A special camera captures this energy, creating images of your bones to help identify any abnormalities.

58 services54 patients

Nuclear medicine study whole body with ct scan 78816

A Nuclear Medicine Study with a CT Scan is a diagnostic procedure. It uses a small amount of radioactive substance and a CT scan to create detailed images of your body. These images help doctors diagnose, monitor, and treat various conditions.

55 services50 patients

Nuclear medicine study, spect imaging with concurrent ct scan, 1 area or single acquisition, single day imaging 78830

A nuclear medicine study with SPECT and concurrent CT scan is a special imaging test. It uses a small amount of radioactive substance and advanced imaging techniques to create detailed pictures of your internal body structures. It aids in diagnosing and tracking the progress of treatment for various diseases.

55 services49 patients

Ct scan of abdomen and pelvis without contrast 74176

A CT scan of the abdomen and pelvis is a non-invasive medical test. It uses special X-ray equipment to create detailed images of your abdominal and pelvic areas. This helps doctors examine organs, tissues, and vessels. No contrast dye is used in this procedure.

44 services44 patients

Ct scan of chest without contrast 71250

A CT scan of the chest without contrast is a non-invasive imaging procedure. It uses special X-ray equipment to produce detailed images of your chest area, including your lungs and heart. It can help diagnose conditions such as lung diseases or heart disorders. It doesn't involve any dyes or contrast agents.

42 services42 patients

Limited ultrasound scan of abdomen 76705

A limited ultrasound scan of the abdomen is a non-invasive imaging test. It uses sound waves to produce images of the abdominal organs such as the liver, gallbladder, spleen, pancreas, and kidneys. This helps to identify any abnormalities or issues.

38 services38 patients

X-ray of hip, 2-3 views 73502

An X-ray of the hip with 2-3 views is a non-invasive imaging test. It uses a small amount of radiation to produce pictures of the hip joint. These images help in diagnosing conditions like fractures, arthritis, or other abnormalities. The process is quick and painless.

37 services37 patients

X-ray of foot, minimum of 3 views 73630

An X-ray of the foot, minimum of 3 views, is a non-invasive imaging test. It uses a small amount of radiation to produce images of the bones and tissues in your foot. This helps to identify fractures, infections, or other abnormalities. Multiple views ensure a comprehensive examination.

36 services34 patients

X-ray of shoulder, minimum of 2 views 73030

An X-ray of the shoulder, with a minimum of 2 views, is a non-invasive imaging test. It uses a small amount of radiation to produce images of your shoulder bones. This helps in diagnosing conditions like fractures, arthritis, or other abnormalities. The procedure is quick and painless.

35 services32 patients

Ultrasound scan of head and neck soft tissue 76536

An ultrasound scan of the head and neck soft tissue is a non-invasive procedure that uses sound waves to create images of the soft tissues in these areas. It helps identify any abnormalities or issues, such as tumors, cysts, or infections. It's painless and doesn't involve radiation.

35 services35 patients

Complete ultrasound scan behind abdominal cavity 76770

A complete ultrasound scan behind the abdominal cavity is a non-invasive imaging procedure. It uses sound waves to create pictures of the structures and organs located at the back of your abdomen. It helps in diagnosing health conditions and monitoring ongoing treatments.

33 services33 patients

X-ray of lower and sacral spine, 2-3 views 72100

An X-ray of the lower and sacral spine involves capturing images of your lower back area, including the tailbone. This procedure helps in identifying problems like fractures, infections, or deformities. 2-3 different angle views provide a comprehensive picture.

32 services32 patients

X-ray of hip, 2-3 views 73502

32 services32 patients

X-ray of knee, 4 or more views 73564

An X-ray of the knee, 4 or more views, is a non-invasive imaging test. It involves capturing multiple images of your knee from different angles. This helps in diagnosing conditions such as fractures, arthritis, or infections. The procedure is quick and painless.

31 services29 patients

X-ray of ankle, minimum of 3 views 73610

An ankle X-ray is a quick, painless imaging test. It involves capturing at least three different images or 'views' of your ankle using small amounts of radiation. These images help identify any abnormalities or injuries, such as fractures or arthritis.

31 services28 patients

Imaging for evaluation of swallowing function 74230

This process, known as a swallowing study, uses imaging technology to view how food and liquid move from your mouth to your stomach. It helps identify any issues you may have swallowing, which can be crucial for determining the best treatment plan.

31 services31 patients

Nuclear medicine study of bone taken at different times 78315

A nuclear medicine bone study involves injecting a small amount of radioactive material into your body. This material collects in the bones and is detected by a special camera to create images. These images are taken at different times to track changes and help diagnose bone conditions.

31 services31 patients

Ct scan of upper spine without contrast 72125

A CT scan of the upper spine without contrast is a non-invasive imaging test that uses X-rays to capture detailed images of your neck and upper back. It helps in identifying issues like fractures, tumors, or infections. No dye (contrast) is used in this scan.

29 services29 patients

X-ray of knee, 3 views 73562

An X-ray of the knee, 3 views, is a non-invasive imaging test. It uses a small amount of radiation to produce images of the knee from three different angles. This helps medical professionals to diagnose and monitor conditions like arthritis, fractures, or infections. The process is quick and painless.

27 services25 patients

X-ray of lower and sacral spine, 2-3 views 72100

24 services24 patients

Nuclear medicine study of liver and bile duct system 78226

A nuclear medicine study of the liver and bile duct system involves the use of a small amount of radioactive material to create detailed images. This helps doctors examine the liver's function and structure, and detect any abnormalities in the bile ducts.

24 services24 patients

X-ray of foot, minimum of 3 views 73630

22 services21 patients

Nuclear medicine study, whole body 78802

A whole-body nuclear medicine study involves a special camera and a small amount of radioactive material to visualize various body functions. The radioactive material, or tracer, shows how organs and tissues are working. This can help diagnose or monitor certain conditions.

22 services18 patients

Complete ultrasound scan behind abdominal cavity 76770

21 services21 patients

X-ray of shoulder, minimum of 2 views 73030

20 services20 patients

X-ray of knee, 1-2 views 73560

An X-ray of the knee with 1-2 views is a quick, painless test that produces images of the knee bones. It helps identify fractures, infections, or changes in the knee joint. During the procedure, you'll be asked to stay still while the X-ray machine captures the images.

20 services19 patients

X-ray of wrist, minimum of 3 views 73110

An X-ray of the wrist, minimum of 3 views, is a diagnostic procedure that uses radiation to create images of your wrist from different angles. This helps detect fractures, infections, or other abnormalities for accurate diagnosis and treatment planning.

19 services17 patients

X-ray of wrist, minimum of 3 views 73110

19 services18 patients

X-ray of abdomen, 2 views 74019

An X-ray of the abdomen, 2 views, is a non-invasive imaging test. It uses a small amount of radiation to capture pictures of the structures inside your belly. The two views provide different angles, helping doctors see your organs clearly and detect any issues.

19 services19 patients

Nuclear medicine study of lung ventilation and circulation 78582

A nuclear medicine lung ventilation and circulation study uses a safe radioactive material to create images of air and blood flow in your lungs. It helps identify issues like blood clots or lung diseases. You inhale or receive an injection of this material, and a special camera captures the images.

19 services19 patients

Ultrasound study of arm and leg arteries 93922

An ultrasound study of arm and leg arteries is a non-invasive procedure that uses sound waves to create images of your arteries. It helps in checking blood flow, identifying blockages, or detecting other abnormalities in your arteries.

19 services19 patients

Ultrasound study of one arm or leg veins with compression and maneuvers 93971

This is a non-invasive procedure using sound waves to visualize veins in an arm or leg. It involves applying gentle pressure and performing certain movements. It helps identify any abnormal blood flow or clots, ensuring vascular health.

19 services19 patients

Ct scan of blood vessels of abdomen and pelvis with contrast 74174

A CT scan of the abdomen and pelvis with contrast is a medical imaging procedure. A special dye, called contrast, is used to make blood vessels more visible. The scan produces detailed images of your abdomen and pelvis, helping doctors to diagnose conditions or plan treatments.

17 services17 patients

X-ray of knee, 1-2 views 73560

16 services14 patients

X-ray of hand, minimum of 3 views 73130

An X-ray of the hand, minimum of 3 views, is a non-invasive imaging test. It uses a small amount of radiation to produce images of the bones in your hand from different angles. This helps in diagnosing fractures, infections, arthritis, or other abnormalities. It's quick and painless.

15 services13 patients

Nuclear medicine study of liver and bile duct system with use of drugs 78227

A nuclear medicine study of the liver and bile duct system involves injecting a safe, radioactive substance into the body. This substance helps create images of these areas on a special camera. It's often combined with drug use to improve image clarity and aid in diagnosing various conditions.

15 services15 patients

X-ray of pelvis, 1-2 views 72170

An X-ray of the pelvis, 1-2 views, is a quick and painless imaging test. It uses a small amount of radiation to produce images of the lower part of your torso. These images help to detect any abnormalities or injuries in your hip bones and surrounding structures.

14 services14 patients

X-ray of abdomen, 1 view 74018

13 services13 patients

X-ray of upper spine, 2-3 views 72040

An X-ray of the upper spine, with 2-3 views, is a painless procedure that employs a small amount of radiation to capture images of your neck and upper back. It assists in diagnosing conditions like arthritis, fractures, or spinal deformities.

12 services12 patients

X-ray of lower and sacral spine, minimum of 4 views 72110

An X-ray of the lower and sacral spine involves capturing images of your lower back and tailbone area. It helps in identifying issues like fractures, arthritis, or other abnormalities. At least four different angles or 'views' are taken to get a comprehensive picture.

12 services12 patients

X-ray of ankle, minimum of 3 views 73610

12 services11 patients

Ct scan of abdomen and pelvis without contrast 74176

12 services12 patients

Complete ultrasound scan of abdomen 76700

A complete ultrasound scan of the abdomen is a non-invasive imaging procedure. It uses sound waves to produce images of the organs in your abdomen, such as the liver, gallbladder, spleen, pancreas, and kidneys. It helps in diagnosing, monitoring, and planning treatments.

12 services12 patients

X-ray of upper spine, 2-3 views 72040

11 services11 patients

Ct scan of abdomen and pelvis before and after contrast 74178

A CT scan of your abdomen and pelvis with and without contrast helps visualize your internal organs better. Contrast is a special dye that improves the clarity of the images. It's taken orally or injected into your veins before the scan. The process is painless and quick.

11 services11 patients

Nuclear medicine study of kidney, blood, flow, and function with drug administration 78708

This procedure helps analyze kidney function using a safe radioactive substance and special imaging. The substance is administered through an injection and travels to your kidneys. Images are then taken to assess blood flow and overall kidney function.

11 services11 patients

Hospital Affiliations CMS Care Compare 5

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Avera Marshall Regional Medical Ctr

Critical Access Hospitals · Marshall, MN

5/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number241359

Location300 South Bruce StreetMarshall, MN 56258 · Lyon County

Emergency services

Brookings Health System

Acute Care Hospitals · Brookings, SD

3/5 CMS rating

OwnershipGovernment - Local

CMS Certification Number430008

Location300 22nd AveBrookings, SD 57006 · Brookings County

Emergency services Birthing friendly

Avera Mckennan Hospital & University Health Center

Acute Care Hospitals · Sioux Falls, SD

4/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number430016

Location1325 S Cliff AveSioux Falls, SD 57117 · Minnehaha County

Emergency services Birthing friendly

Avera Heart Hospital Of South Dakota

Acute Care Hospitals · Sioux Falls, SD

5/5 CMS rating

OwnershipProprietary

CMS Certification Number430095

Location4500 W 69th StSioux Falls, SD 57108 · Lincoln County

Emergency services

Avera Queen Of Peace

Critical Access Hospitals · Mitchell, SD

OwnershipVoluntary non-profit - Private

CMS Certification Number431340

Location525 N FosterMitchell, SD 57301 · Davison County

Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 57105 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient

$85.21 typical visit price

range $55.52 – $167.23

Typical copayment $21.30 (range $13.88 – $41.80)

Most-billed visit code 99203

Established Patient

$69.20 typical visit price

range $18.08 – $137.08

Typical copayment $17.30 (range $4.52 – $34.27)

Most-billed visit code 99213

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Christopher Gregory's NPI number?

The NPI number for Christopher Gregory is 1821050212. It was assigned to this individual provider in the NPPES registry on April 3, 2006.

Where is Christopher Gregory located?

Christopher Gregory practices at 1325 S. Cliff Ave, Sioux Falls, SD 57105. The listed phone number is (605) 322-7510.

What is Christopher Gregory's specialty?

The primary specialty registered for this NPI is Radiology, specializing in Diagnostic Radiology, with taxonomy code 2085R0202X.

Is Christopher Gregory enrolled in Medicare?

Yes. Christopher Gregory is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organizations bill Medicare for Christopher Gregory's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Christopher Gregory reassigns Medicare benefits to 8 organizations: Avera Mckennan (Sioux Falls, SD), Urology Specialists Chartered (Sioux Falls, SD), Freeman Regional Health Services (Marion, SD), Avera Queen Of Peace (Salem, SD), Madison Community Hospital (Madison, SD) and 3 more organizations, listed in the Medicare section above. Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Christopher Gregory's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Christopher Gregory accept?

Health plans from Ambetter Health, Ambetter Health of Delaware, Ambetter from Sunflower Health Plan, Avera Health Plans and Oscar Insurance Company and 2 other insurers list Christopher Gregory as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

Is Christopher Gregory affiliated with any hospitals?

According to CMS data, Christopher Gregory is affiliated with Avera Marshall Regional Medical Ctr, Brookings Health System, Avera Mckennan Hospital & University Health Center, Avera Heart Hospital Of South Dakota and Avera Queen Of Peace.

When was this NPI record last updated?

The NPPES record for Christopher Gregory was last updated on October 17, 2018. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 8 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.