DR. NATHAN JOSEPH SIESENER MD
NPI 1295239804
Radiology - Diagnostic Radiology in Belleville, IL

Q: What is Nathan Siesener's NPI number?

The NPI number for Nathan Siesener is 1295239804. It was assigned to this individual provider in the NPPES registry on March 19, 2018.

Q: What is Nathan Siesener'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 Nathan Siesener was last updated on October 21, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 9 months 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 March 19, 2018PECOS EnrolledAccepts Medicare Assignment

98.59/100

CMS Quality Rating

4500 MEMORIAL DR, DEPT RADIOLOGY, BELLEVILLE, IL 62226(618) 257-5613(314) 454-4641 Get Directions Write a Review

NPPES record last updated: October 21, 2025. Verified against the NPPES registry weekly; last sync: August 02, 2026.

Record update history: Mar 28, 2023, Oct 11, 2021, Mar 19, 2018 (3 updates tracked since 2018).

On this page

About Dr. Nathan Joseph Siesener Md NPPES

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

DR. NATHAN JOSEPH SIESENER MD (NPI 1295239804) is an individual diagnostic radiology provider in Belleville, Illinois, licensed in Illinois (036164864) and active in the NPI registry since March 2018. He is enrolled in Medicare PECOS, is affiliated with Alton Memorial Hospital, and is a graduate of University Of Missouri, Columbia School Of Medicine (2018).

NPPES Registry Identity

NPI1295239804

Entity TypeIndividualMale

Primary Taxonomy2085R0202X

Provider Legal NameDR. NATHAN JOSEPH SIESENERCredential: MD

Location Address4500 MEMORIAL DR, DEPT RADIOLOGYBelleville, IL 62226-5360

Mailing AddressPo Box 7412011Chicago, IL 60674-2011 · (618) 257-5613 · Fax (314) 454-4641

Phone(618) 257-5613

Fax(314) 454-4641

Sole ProprietorNo

Medical School CMSUniversity Of Missouri, Columbia School Of MedicineGraduated 2018

Enumeration DateMarch 19, 2018

Last NPPES UpdateOctober 21, 20253 updates tracked since enumeration

NPPES CertifiedMarch 28, 2023

✔ NPI 1295239804 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 IL · 036164864

Definition

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

4500 MEMORIAL DR, Belleville, IL 62226

Open in Google Maps ↗

Other Identifiers 1

Medicaid200128296MO

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Nathan Joseph Siesener 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 ID7719216423

PECOS Enrollment IDI20230728003077, I20230731000155, I20230804003576

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.

Areas of Expertise CMS Part B claims 25

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.

239 services227 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.

104 services103 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.

91 services91 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.

91 services90 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.

69 services68 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.

68 services67 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.

64 services63 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.

44 services44 patients

Mri scan of abdomen before and after contrast 74183

An MRI scan of the abdomen before and after contrast provides detailed images of your abdominal organs. Initially, images are taken without a contrast agent. Then, a safe dye is administered, usually via an IV, to highlight certain areas, giving a clearer picture to help diagnose various conditions.

37 services37 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.

36 services36 patients

3d radiographic procedure with computerized image postprocessing 76377

A 3D radiographic procedure with computerized image postprocessing is a high-tech imaging test. It uses X-rays to create detailed 3D images of the body. The computerized postprocessing further enhances these images for more precise diagnosis and treatment planning.

27 services26 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.

24 services24 patients

Ct scan of lower spine without contrast 72131

A CT scan of the lower spine without contrast is a non-invasive imaging test. It uses X-rays to create detailed images of your lower back area, helping to detect conditions like fractures, infections, or tumors. It's painless and generally quick.

19 services19 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.

17 services17 patients

Ct scan of pelvis without contrast 72192

A CT scan of the pelvis without contrast is a non-invasive imaging test. It uses X-rays to create detailed pictures of your lower abdomen area. It helps in detecting issues like injuries, inflammation, or abnormal growths. It doesn't involve any dye injection.

15 services15 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.

14 services14 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.

14 services14 patients

Mri scan of pelvis before and after contrast 72197

An MRI scan of the pelvis before and after contrast is a non-invasive imaging technique. It uses magnetic fields and radio waves to capture detailed images of your lower abdomen. Contrast dye, safe for the body, improves image clarity. This helps detect abnormalities more accurately.

13 services13 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.

13 services13 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.

12 services12 patients

Ultrasound study of arm or leg veins with compression and maneuvers 93970

An ultrasound study of arm or leg veins with compression and maneuvers is a non-invasive procedure that uses sound waves to create images of your veins. This helps identify blood clots or other vein problems. During the procedure, pressure is applied to the veins and certain movements are performed to assess blood flow.

12 services12 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.

11 services11 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.

11 services11 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.

11 services11 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.

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.

Alton Memorial Hospital

Acute Care Hospitals · Alton, IL

4/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number140002

LocationOne Memorial DriveAlton, IL 62002 · Madison County

Emergency services Birthing friendly

Memorial Hospital

Acute Care Hospitals · Belleville, IL

4/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number140185

Location4500 Memorial DriveBelleville, IL 62226 · St. Clair County

Emergency services Birthing friendly

Hopedale Hospital

Critical Access Hospitals · Hopedale, IL

OwnershipVoluntary non-profit - Private

CMS Certification Number141330

Location107 Tremont StreetHopedale, IL 61747 · Tazewell County

Emergency services

Salem Township Hospital

Critical Access Hospitals · Salem, IL

3/5 CMS rating

OwnershipGovernment - Local

CMS Certification Number141345

Location1201 Ricker DriveSalem, IL 62881 · Marion County

Emergency services

Barnes Jewish Hospital

Acute Care Hospitals · Saint Louis, MO

4/5 CMS rating

OwnershipVoluntary non-profit - Other

CMS Certification Number260032

LocationOne Barnes-Jewish Hospital PlazaSaint Louis, MO 63110 · St. Louis City County

Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 62226 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

$88.44 typical visit price

range $56.28 – $173.35

Typical copayment $22.11 (range $14.07 – $43.33)

Most-billed visit code 99203

Established Patient

$70.42 typical visit price

range $17.51 – $139.99

Typical copayment $17.60 (range $4.37 – $34.99)

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.

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

98.59/100

MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program

Scored as part of a group practice

Quality

96.8

Improvement Activities

Leave this field empty

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.

CEP AMERICA - ILLINOIS SNF, LLP

Internal Medicine (Infectious Disease)

4500 MEMORIAL DR
BELLEVILLE, IL 62226

St. Clair County (618) 233-7750

MS. LAUREN NICOLE MARSHALL FNP

Nurse Practitioner

4500 MEMORIAL DR
BELLEVILLE, IL 62226

St. Clair County (618) 257-5455

MR. LITO T RUFIN NP

Nurse Practitioner

4500 MEMORIAL DR
BELLEVILLE, IL 62226

St. Clair County (618) 257-6220

KIM C WRIGLEY P.A.

Physician Assistant

4500 MEMORIAL DR
BELLEVILLE, IL 62226

St. Clair County (618) 257-6220

BRIAN BENDEL

Nurse Anesthetist, Certified Registered

4500 MEMORIAL DR
BELLEVILLE, IL 62226

St. Clair County (561) 623-2008

DR. PAUL D SANDER MD

Pain Medicine (Pain Medicine)

4500 MEMORIAL DR, ANESTHESIA DEPT
BELLEVILLE, IL 62226

St. Clair County (618) 257-4076

DR. NEIL MCCLYMONT D.O.

Emergency Medicine

4500 MEMORIAL DR, MEMORIAL HOSPITAL - ER
BELLEVILLE, IL 62226

St. Clair County (618) 233-7750

DR. VIBHU DHAWAN MD

Internal Medicine

4500 MEMORIAL DR
BELLEVILLE, IL 62226

St. Clair County (618) 257-6220

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 Nathan Siesener's NPI number?

The NPI number for Nathan Siesener is 1295239804. It was assigned to this individual provider in the NPPES registry on March 19, 2018.

Where is Nathan Siesener located?

Nathan Siesener practices at 4500 Memorial Dr Dept Radiology, Belleville, IL 62226. The listed phone number is (618) 257-5613.

What is Nathan Siesener's specialty?

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

Is Nathan Siesener enrolled in Medicare?

Yes. Nathan Siesener 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.

Is Nathan Siesener affiliated with any hospitals?

According to CMS data, Nathan Siesener is affiliated with Alton Memorial Hospital, Memorial Hospital, Hopedale Hospital, Salem Township Hospital and Barnes Jewish Hospital.

When was this NPI record last updated?

The NPPES record for Nathan Siesener was last updated on October 21, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 9 months 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.