SEAN K. SHANNAHAN MD
NPI 1831179571
Radiology - Diagnostic Radiology in Madison, WI

Q: What is Sean Shannahan's NPI number?

The NPI number for Sean Shannahan is 1831179571. It was assigned to this individual provider in the NPPES registry on January 19, 2006.

Q: What is Sean Shannahan's specialty?

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

Q: When was this NPI record last updated?

The NPPES record for Sean Shannahan was last updated on September 24, 2014. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 12 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.

Active since January 19, 2006PECOS EnrolledAccepts Medicare Assignment

700 S PARK ST, MADISON, WI 53715(608) 251-6100(608) 826-2710 Get Directions Write a Review

NPPES record last updated: September 24, 2014. Verified against the NPPES registry weekly; last sync: November 01, 2026.

On this page

About Sean K. Shannahan Md NPPES

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

SEAN K. SHANNAHAN MD (NPI 1831179571) is an individual diagnostic radiology provider in Madison, Wisconsin, licensed in Wisconsin (44311) and active in the NPI registry since January 2006. He is enrolled in Medicare PECOS, is affiliated with The Monroe Clinic, and is a graduate of Chicago College Of Medicine And Surgery (1997).

NPPES Registry Identity

NPI1831179571

Entity TypeIndividualMale

Primary Taxonomy2085R0202X

Provider Legal NameSEAN K. SHANNAHANCredential: MD

Location Address700 S PARK STMadison, WI 53715-1849

Mailing Address700 S Park StMadison, WI 53715-1849 · (608) 251-6100 · Fax (608) 826-2710

Phone(608) 251-6100

Fax(608) 826-2710

Sole ProprietorNo

Medical School CMSChicago College Of Medicine And SurgeryGraduated 1997

Enumeration DateJanuary 19, 2006

Last NPPES UpdateSeptember 24, 2014

✔ NPI 1831179571 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 WI · 44311

Definition

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

700 S PARK ST, Madison, WI 53715

Open in Google Maps ↗

Other Identifiers 5

Medicaid34212400WI

Medicare ID-Type Unspecified002727060

Medicare ID-Type Unspecified003115045

Medicare UPINH66263

Medicare ID-Type Unspecified002554365

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

Sean K. Shannahan 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 ID2365344348

PECOS Enrollment IDI20040121000642

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 Sean Shannahan reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Madison Radiologists S C

Same address

Diagnostic Radiology

700 S PARK ST
Madison, WI 53715

Reassigned Medicare billing, Wisconsin enrollment
63 clinicians in this Medicare group

NPI 1871573725 (608) 251-6100

Dean Health Systems, Inc

0.4 mi

Allergy & Immunology

1211 FISH HATCHERY RD
Madison, WI 53715

Reassigned Medicare billing, Wisconsin enrollment
1,377 clinicians in this Medicare group

NPI 1053358846 (608) 252-8000

Beloit Radiology Ltd

41 mi

Diagnostic Radiology

1969 W HART RD
Beloit, WI 53511

Reassigned Medicare billing, Wisconsin enrollment
40 clinicians in this Medicare group

NPI 1386661734 (608) 364-5269

Radiology Associates Of The Fox Valley, Sc

91 mi

Diagnostic Radiology

333 N COMMERCIAL ST
Neenah, WI 54956

Reassigned Medicare billing, Wisconsin enrollment
84 clinicians in this Medicare group

NPI 1477539443 (920) 722-1583

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 79

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.

Low osmolar contrast material, 300-399 mg/ml iodine concentration, per ml Q9967

Low osmolar contrast material with 300-399 mg/ml iodine concentration is a diagnostic tool used in imaging procedures. It helps to enhance the visibility of specific areas in the body, aiding in accurate diagnosis. It's safe and generally well-tolerated by patients.

6,937 services77 patients

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.

496 services472 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.

318 services309 patients

Screening mammography 77067

Screening mammography is a preventative measure that uses low-dose X-rays to take images of the chest area. It's a key tool in early detection of abnormalities, helping to identify issues before they become symptomatic. It is recommended annually for certain age groups.

256 services256 patients

Screening 3d breast mammography 77063

Screening 3D breast mammography is a procedure that uses low-dose X-rays to create detailed images of the breast. This allows for early detection of any unusual changes or growths. It's a non-invasive, outpatient procedure that typically takes about 30 minutes.

255 services255 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.

200 services195 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.

168 services166 patients

X-ray of chest, 2 views 71046

156 services156 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.

121 services121 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.

104 services89 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.

102 services102 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.

97 services92 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.

95 services79 patients

X-ray of knee, 4 or more views 73564

91 services77 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.

81 services81 patients

Ct scan of blood vessels of neck with contrast 70498

A CT scan of the neck's blood vessels with contrast is a diagnostic procedure. It uses X-rays and a special dye to create detailed images of your neck's blood vessels. This helps doctors detect issues such as blockages or abnormalities.

77 services77 patients

X-ray of hip, 2-3 views 73502

77 services74 patients

Ct scan of blood vessels of head with contrast 70496

A CT scan of the head's blood vessels with contrast is a diagnostic procedure. A special dye (contrast) is injected into your body to make the blood vessels visible on the scan. This helps identify issues like blockages or abnormalities in your head's blood vessels.

74 services74 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.

72 services68 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.

63 services63 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.

63 services55 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.

62 services61 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.

57 services54 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.

55 services54 patients

X-ray of foot, minimum of 3 views 73630

54 services48 patients

X-ray of shoulder, minimum of 2 views 73030

50 services48 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.

48 services48 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.

47 services46 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.

46 services46 patients

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

46 services46 patients

Diagnostic digital breast tomosynthesis, unilateral or bilateral (list separately in addition to 77065 or 77066) G0279

Diagnostic digital breast tomosynthesis is a 3D imaging test that allows doctors to examine your breast tissue layer by layer. It's performed on one or both sides. It helps in detecting abnormalities more accurately. It's often done in addition to other tests.

45 services45 patients

Ultrasound of both sides of head and neck blood flow 93880

An ultrasound of the head and neck blood flow is a safe, non-invasive procedure that uses sound waves to create images of blood vessels. It helps detect abnormalities like blockages or clots, ensuring optimal blood flow.

44 services43 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.

43 services43 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.

42 services38 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.

41 services41 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.

35 services35 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.

34 services32 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.

33 services31 patients

X-ray of ankle, minimum of 3 views 73610

32 services31 patients

Limited ultrasound scan of 1 breast 76642

A limited ultrasound scan of one breast is a non-invasive imaging test. It uses sound waves to create pictures of the inside of your breast. It helps identify any unusual growths or changes. It's safe, quick, and typically painless.

32 services32 patients

Ct scan of abdomen and pelvis with contrast 74177

30 services29 patients

Screening 3d breast mammography 77063

30 services30 patients

Screening mammography 77067

30 services30 patients

X-ray of wrist, minimum of 3 views 73110

28 services25 patients

Diagnostic mammography of 1 breast 77065

Diagnostic mammography of 1 breast is a detailed imaging test that allows doctors to closely examine a specific area in the breast. It's often used when a routine screening reveals an abnormality. This test can help identify any unusual changes or issues.

28 services28 patients

Ct scan of chest with contrast 71260

27 services27 patients

X-ray of hand, minimum of 3 views 73130

25 services20 patients

X-ray of knee, 3 views 73562

25 services24 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.

23 services23 patients

X-ray of abdomen, 1 view 74018

23 services23 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.

23 services23 patients

Fluoroscopic guidance for needle placement 77002

Fluoroscopic guidance for needle placement is a medical procedure that uses a special X-ray technology to help accurately place a needle in the body. It's often used in biopsies, injections or other treatments to ensure precision and safety.

23 services21 patients

Diagnostic mammography of both breasts 77066

Diagnostic mammography involves using special imaging technology to capture detailed images of both breasts. This procedure helps in identifying any unusual changes or abnormalities. It's a crucial step in ensuring breast health and early detection of potential issues.

21 services21 patients

Aspiration and/or injection of fluid from large joint 20610

This procedure involves using a needle to remove (aspiration) or introduce (injection) fluid into a large joint like the knee or hip. It can help diagnose conditions, relieve discomfort, or deliver medication directly to the joint.

20 services19 patients

X-ray of ribs on side of body, minimum of 3 views 71101

This is a diagnostic procedure where a machine emits a small amount of radiation to capture images of your ribs from at least three different angles. It helps to identify issues like fractures or infections. It's a quick, painless process.

20 services20 patients

Mri scan of lower spinal canal without contrast 72148

An MRI scan of the lower spinal canal without contrast is a non-invasive imaging test. It uses a magnetic field and radio waves to produce detailed images of your lower spine. This helps identify issues like disc problems, tumors, or nerve conditions. No dye is used.

20 services20 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.

20 services20 patients

Limited ultrasound scan of abdomen 76705

17 services17 patients

Dxa bone density measurement of hip, pelvis, spine 77080

17 services17 patients

Ct scan of chest without contrast 71250

16 services16 patients

X-ray of upper spine, 4-5 views 72050

An X-ray of the upper spine with 4-5 views is a non-invasive imaging test. It uses radiation to capture detailed images of the bones and structures in your neck and upper back. This procedure helps identify issues like fractures, infections, or deformities.

16 services16 patients

X-ray of lower leg, 2 views 73590

An X-ray of the lower leg, 2 views, is a quick, painless test that produces images of the bones in your lower leg. It helps to identify fractures, infections, or diseases. Two different angles are used to provide a comprehensive view of the leg's structure.

16 services16 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.

16 services15 patients

X-ray of finger, minimum of 2 views 73140

An X-ray of the finger involves capturing images of your finger from at least two different angles. This non-invasive procedure helps in visualizing the bones and joints, aiding in the diagnosis of fractures, infections, or other abnormalities. Minimal discomfort may be experienced.

15 services15 patients

X-ray of both hips, 3-4 views 73522

An X-ray of both hips with 3-4 views is a safe imaging procedure. It involves capturing multiple pictures of your hip joints from different angles. This helps in diagnosing conditions like arthritis or fractures. You'll need to stay still during the process for clear images.

15 services14 patients

Complete ultrasound scan of pelvis 76856

A complete ultrasound scan of the pelvis is a safe, non-invasive imaging procedure. It uses sound waves to create pictures of your lower abdomen area, helping doctors to evaluate and diagnose any potential issues. It's painless and usually takes about 30 minutes.

15 services15 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.

14 services14 patients

Ultrasound scan of head and neck soft tissue 76536

14 services14 patients

Ct scan of face without contrast 70486

A CT scan of the face without contrast is a non-invasive imaging procedure. It uses X-rays to create detailed pictures of your face, including bones, soft tissues, and blood vessels. It's often used to diagnose diseases, injuries, or abnormalities. No contrast dye is used in this procedure.

13 services13 patients

Ct scan of soft tissue of neck with contrast 70491

A CT scan of the neck with contrast is a non-invasive imaging procedure. A special dye is administered to highlight the soft tissues in your neck, making them easier to see. This helps detect issues like infections, tumors, or other abnormalities.

13 services13 patients

X-ray of ribs on side of body, minimum of 3 views 71101

13 services13 patients

X-ray of middle spine, 2 views 72070

An X-ray of the middle spine, or thoracic spine, involves capturing two different images of the area. This non-invasive procedure uses small amounts of radiation to visualize the bones and tissues in your back, helping to identify any abnormalities or injuries.

13 services13 patients

Mri scan of upper spinal canal without contrast 72141

An MRI scan of the upper spinal canal without contrast is a non-invasive imaging test. It uses a magnetic field and radio waves to create detailed images of your upper spine. This helps doctors identify issues such as injuries, infections or diseases. No dye is used.

13 services13 patients

Ultrasound scan of abdominal aorta 76706

An ultrasound scan of the abdominal aorta is a non-invasive imaging test. It uses sound waves to create pictures of the main blood vessel in your abdomen, the aorta, to check its size and shape. This helps detect any abnormalities or issues early.

13 services13 patients

X-ray of thigh bone, minimum 2 views 73552

An X-ray of the thigh bone is a non-invasive imaging test. It involves passing a small amount of radiation through the thigh to produce images of the bone structure. At least two different angles are captured for a comprehensive view. This helps detect fractures, infections, or other abnormalities.

12 services12 patients

Complete ultrasound scan behind abdominal cavity 76770

12 services12 patients

Ultrasound scan of uterus, ovaries, tubes, cervix and pelvic area through vagina 76830

An ultrasound scan of the lower abdominal region is a safe, non-invasive procedure that uses sound waves to create images of internal structures. This helps in checking the health of reproductive organs and detecting any abnormalities. The scan is done via a small probe inserted into the body.

12 services12 patients

X-ray of both hips, 3-4 views 73522

11 services11 patients

Diagnostic digital breast tomosynthesis, unilateral or bilateral (list separately in addition to 77065 or 77066) G0279

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.

The Monroe Clinic

Acute Care Hospitals · Monroe, WI

4/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number520028

Location515 22nd AveMonroe, WI 53566 · Green County

Emergency services Birthing friendly

Ssm Health St Mary's Hospital - Madison

Acute Care Hospitals · Madison, WI

5/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number520083

Location700 South Park StMadison, WI 53715 · Dane County

Emergency services Birthing friendly

Sauk Prairie Hospital

Acute Care Hospitals · Prairie Du Sac, WI

5/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number520095

Location260 26th StreetPrairie Du Sac, WI 53578 · Sauk County

Emergency services Birthing friendly

Memorial Hospital Of Lafayette County

Critical Access Hospitals · Darlington, WI

OwnershipVoluntary non-profit - Other

CMS Certification Number521312

Location800 Clay StDarlington, WI 53530 · Lafayette County

Emergency services

Reedsburg Area Medical Center

Critical Access Hospitals · Reedsburg, WI

5/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number521351

Location2000 N Dewey AveReedsburg, WI 53959 · Sauk County

Emergency services

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 53715 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

$82.92 typical visit price

range $53.90 – $163.24

Typical copayment $20.73 (range $13.47 – $40.81)

Most-billed visit code 99203

Established Patient

$67.37 typical visit price

range $17.40 – $133.76

Typical copayment $16.84 (range $4.35 – $33.44)

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.

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

CHRISTOPHER DO

Physician Assistant

700 S PARK ST
MADISON, WI 53715

Dane County (608) 251-6100

JEREMI THOMAS OLSON PA-C

Physician Assistant (Surgical)

700 S PARK ST, DEAN ST. MARY'S OUTPATIENT CENTER
MADISON, WI 53715

Dane County (608) 260-2900

TIMOTHY J MORTON PA-C

Physician Assistant

700 S PARK ST, DEAN MEDICAL CENTER
MADISON, WI 53715

Dane County (608) 251-6100

STEPHEN H VANDER SLUIS

Anesthesiology

700 S PARK ST
MADISON, WI 53715

Dane County (608) 251-6100

BENJAMIN KLEIBER M.D.

Internal Medicine (Cardiovascular Disease)

700 S PARK ST, DEAN & ST. MARY'S OUTPATIENT CENTER
MADISON, WI 53715

Dane County (608) 260-2900

ERIN M MULLAN-TOWNS PA-C

Physician Assistant

700 S PARK ST
MADISON, WI 53715

Dane County (608) 260-2900

CONNIE SUE MCCULLICK APNP

Nurse Practitioner

700 S PARK ST
MADISON, WI 53715

Dane County (608) 251-6100

JUSTIN ALLEN LEHRKE CRNA

Nurse Anesthetist, Certified Registered

700 S PARK ST
MADISON, WI 53715

Dane County (608) 251-6100

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 Sean Shannahan's NPI number?

The NPI number for Sean Shannahan is 1831179571. It was assigned to this individual provider in the NPPES registry on January 19, 2006.

Where is Sean Shannahan located?

Sean Shannahan practices at 700 S Park St, Madison, WI 53715. The listed phone number is (608) 251-6100.

What is Sean Shannahan's specialty?

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

Is Sean Shannahan enrolled in Medicare?

Yes. Sean Shannahan 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 Sean Shannahan's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Sean Shannahan reassigns Medicare benefits to 4 organizations: Madison Radiologists S C (Madison, WI), Dean Health Systems, Inc (Madison, WI), Beloit Radiology Ltd (Beloit, WI) and Radiology Associates Of The Fox Valley, Sc (Neenah, WI). 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 Sean Shannahan's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

Is Sean Shannahan affiliated with any hospitals?

According to CMS data, Sean Shannahan is affiliated with The Monroe Clinic, Ssm Health St Mary's Hospital - Madison, Sauk Prairie Hospital, Memorial Hospital Of Lafayette County and Reedsburg Area Medical Center.

When was this NPI record last updated?

The NPPES record for Sean Shannahan was last updated on September 24, 2014. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 12 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.