DR. CLARK W ANTONSON MD
NPI 1831182757
Internal Medicine - Gastroenterology in Lincoln, NE

Q: What is Clark Antonson's NPI number?

The NPI number for Clark Antonson is 1831182757. It was assigned to this individual provider in the NPPES registry on August 25, 2005.

Q: What is Clark Antonson's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Gastroenterology, with taxonomy code 207RG0100X.

Q: When was this NPI record last updated?

The NPPES record for Clark Antonson was last updated on January 27, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 18 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 August 25, 2005PECOS EnrolledAccepts Medicare Assignment

94.57/100

CMS Quality Rating

4545 R ST, LINCOLN, NE 68503(402) 465-4545(402) 465-3621 Get Directions Write a Review

NPPES record last updated: January 27, 2025. Verified against the NPPES registry weekly; last sync: August 16, 2026.

On this page

About Dr. Clark W Antonson Md NPPES

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

DR. CLARK W ANTONSON MD (NPI 1831182757) is an individual gastroenterology provider in Lincoln, Nebraska, licensed in Nebraska (17282) and active in the NPI registry since August 2005. He is enrolled in Medicare PECOS, is affiliated with Bryan Medical Center, and is a graduate of University Of Nebraska College Of Medicine (1985).

NPPES Registry Identity

NPI1831182757

Entity TypeIndividualMale

Primary Taxonomy207RG0100X

Provider Legal NameDR. CLARK W ANTONSONCredential: MD

Location Address4545 R STLincoln, NE 68503-3723

Mailing Address4545 R StLincoln, NE 68503-3723 · (402) 465-4545 · Fax (402) 465-3621

Phone(402) 465-4545

Fax(402) 465-3621

Sole ProprietorNo

Medical School CMSUniversity Of Nebraska College Of MedicineGraduated 1985

Enumeration DateAugust 25, 2005

Last NPPES UpdateJanuary 27, 2025

NPPES CertifiedJanuary 27, 2025

✔ NPI 1831182757 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyInternal Medicine · GastroenterologyAllopathic & Osteopathic Physicians

Taxonomy Code207RG0100X

License✔ Licensed in NE · 17282

Definition

An internist who specializes in diagnosis and treatment of diseases of the digestive organs including the stomach, bowels, liver and gallbladder. This specialist treats conditions such as abdominal pain, ulcers, diarrhea, cancer and jaundice and performs complex diagnostic and therapeutic procedures using endoscopes to visualize internal organs.

Also ListedSpecialistTaxonomy 174400000X · License 17282 (NE)

4545 R ST, Lincoln, NE 68503

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Accepted Insurance

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

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. Clark W Antonson 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 ID8426019688

PECOS Enrollment IDI20041020001337

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 20

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.

Injection, vedolizumab, intravenous, 1 mg J3380

Vedolizumab is a medication given via injection. It's used to treat certain bowel conditions (such as Crohn's disease, ulcerative colitis) by reducing inflammation. It works by blocking a certain protein that causes this inflammation.

6,000 services18 patients

Injection, infliximab, excludes biosimilar, 10 mg J1745

Infliximab is a medication given via injection to treat certain autoimmune conditions. It works by blocking the action of a substance in your body that causes inflammation. Each dose is based on your medical condition and response to treatment.

1,240 services18 patients

Removal of polyps or growths of large bowel using an endoscope with mechanical snare 45385

This procedure involves using a thin, flexible tube called an endoscope to examine the large bowel. If any abnormal growths or polyps are found, a tool called a mechanical snare is used to remove them. This is a common method to prevent potential health issues.

231 services231 patients

Colorectal cancer screening; colonoscopy on individual at high risk G0105

Colorectal cancer screening, specifically a colonoscopy, is a preventive measure for those at high risk. A thin, flexible tube with a camera inspects the colon to spot any abnormal growths. This test helps detect potential issues early, enhancing the effectiveness of treatment.

72 services72 patients

Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes 99232

Follow-up hospital inpatient care involves daily check-ups while you're admitted in the hospital. Typically, a healthcare provider spends about 25 minutes each day reviewing your condition, adjusting treatment if needed, and answering any questions you might have.

70 services41 patients

Diagnostic exam of esophagus, stomach, and/or upper small bowel using a flexible endoscope 43235

This procedure, known as an upper endoscopy, involves inserting a thin, flexible tube with a camera down the throat to examine the esophagus, stomach, and upper small bowel. It helps diagnose conditions like ulcers or inflammation.

61 services61 patients

Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope 43239

This procedure involves using a thin, flexible tube with a light and camera, known as an endoscope, to examine the esophagus, stomach, and upper part of the small intestine. Small tissue samples are taken for further examination to help diagnose various conditions.

59 services58 patients

Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes 99223

Initial hospital inpatient care per day, typically 70 minutes, refers to the daily medical service provided to patients admitted to the hospital. This includes a comprehensive evaluation, diagnosis, treatment plan, and monitoring of your health condition. It ensures your well-being during your hospital stay.

51 services51 patients

Dilation of esophagus 43450

Dilation of the esophagus is a procedure aimed to stretch or open up your esophagus (the tube connecting your mouth to your stomach) when it's narrow. It helps to improve swallowing and alleviate discomfort. It's typically performed using a flexible tube or balloon, under sedation.

36 services25 patients

Colorectal cancer screening; colonoscopy on individual not meeting criteria for high risk G0121

Colorectal cancer screening, such as a colonoscopy, is a preventive measure to detect early signs of cancer in the large intestine. For individuals not at high risk, it's typically recommended at age 50. A small, flexible tube with a camera is used to examine your colon. It's a safe, effective way to catch issues early.

35 services35 patients

Biopsy of large bowel using a flexible endoscope 45380

A biopsy of the large bowel using a flexible endoscope is a procedure where a thin, flexible tube with a camera is inserted through the rectum to examine the bowel. If abnormal tissue is found, a small sample is taken for further examination. This helps in diagnosing conditions like inflammation, polyps, or cancer.

30 services30 patients

Infusion into a vein for therapy, prevention, or diagnosis, 1 hour or less 96365

This is a procedure where a medical professional inserts a small tube into your vein to deliver medication, nutrients, or fluids directly into your bloodstream. This can be for treatment, prevention, or diagnosis. The process typically takes less than an hour.

27 services22 patients

Administration of chemotherapy into vein, 1 hour or less 96413

Chemotherapy is a treatment that uses drugs to destroy cancer cells. When administered into a vein, it's often through an IV. This procedure usually lasts 1 hour or less. You may feel a slight pinch as the needle is inserted, but it's generally painless.

26 services21 patients

Administration of chemotherapy into vein, each additional hour 96415

Chemotherapy is a treatment method that uses drugs to destroy cancer cells. The drugs are administered into a vein, usually in the arm. Each additional hour of chemotherapy allows for more of the medication to enter your bloodstream to fight against the cancer cells.

26 services21 patients

Diagnostic exam of large bowel using a flexible endoscope 45378

This procedure, known as a colonoscopy, involves using a flexible tube with a light and camera to examine the large intestine. It helps detect any abnormalities such as polyps or inflammation. It's a standard procedure to ensure gut health.

23 services23 patients

New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more 99203

This service involves an initial office or outpatient visit for a new patient. The healthcare professional will spend 30-44 minutes understanding your health history, current issues, and discussing possible treatment plans. It's a comprehensive evaluation to start your healthcare journey.

23 services23 patients

Insertion of guide wire with dilation of esophagus using a flexible endoscope 43248

This is a procedure where a thin tube, called an endoscope, is gently passed through your mouth into your esophagus. A guide wire is then inserted to help widen any narrow areas. This helps improve swallowing and reduce discomfort.

20 services20 patients

Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214

This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.

18 services15 patients

Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213

This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.

14 services14 patients

New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more 99204

This is a first-time office or outpatient visit lasting between 45-59 minutes. The healthcare provider evaluates your health, discusses your medical history, and may suggest further tests or treatments. It's an opportunity to ask questions and understand your health better.

13 services13 patients

Hospital Affiliations CMS Care Compare 5

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

Bryan Medical Center

Acute Care Hospitals · Lincoln, NE

4/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number280003

Location1600 South 48th StLincoln, NE 68506 · Lancaster County

Emergency services Birthing friendly

The Nebraska Medical Center

Acute Care Hospitals · Omaha, NE

3/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number280013

Location987400 Nebraska Medical CenterOmaha, NE 68198 · Douglas County

Emergency services Birthing friendly

Chi Health St. Elizabeth

Acute Care Hospitals · Lincoln, NE

3/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number280020

Location555 South 70th StLincoln, NE 68510 · Lancaster County

Emergency services Birthing friendly

Jefferson Community Health & Life

Critical Access Hospitals · Fairbury, NE

OwnershipVoluntary non-profit - Private

CMS Certification Number281319

LocationP O Box 277, 2200 H StFairbury, NE 68352 · Jefferson County

Emergency services

Beatrice Community Hospital & Health Center, Inc

Critical Access Hospitals · Beatrice, NE

1/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number281364

LocationP O Box 278, 4800 Hospital ParkwayBeatrice, NE 68310 · Gage County

Emergency services

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 68503 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

$121.35 typical visit price

range $52.69 – $160.21

Typical copayment $30.33 (range $13.17 – $40.05)

Most-billed visit code 99204

Established Patient

$93.55 typical visit price

range $16.90 – $131.25

Typical copayment $23.38 (range $4.22 – $32.81)

Most-billed visit code 99214

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.

94.57/100

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

Scored through an Alternative Payment Model

Quality

87.26

Promoting Interoperability

94.37

Improvement Activities

Referred Medical Equipment & Supplies CMS DME claims 2

Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.

Ostomy skin barrier, with flange (solid, flexible or accordion), without built-in convexity, 4 x 4 inches or smaller, each A4414

DME-Orthotic Devices · category DF010N

2 suppliers14 claims280 services$3.82 avg. paid by Medicare

Ostomy pouch, drainable; for use on barrier with flange (2 piece system), each A5063

DME-Orthotic Devices · category DF010N

2 suppliers13 claims260 services$2.28 avg. paid by Medicare

Dollar amounts are the average Medicare paid the supplier per service. They are not the cost to the patient.

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.

MRS. CATHERINE M BATEMAN PA

Physician Assistant

4545 R ST, SUITE 100
LINCOLN, NE 68503

Lancaster County (402) 465-4545

DR. MATTHEW J HRNICEK MD

Internal Medicine (Gastroenterology)

4545 R ST
LINCOLN, NE 68503

Lancaster County (402) 465-4545

SAMANTHA LYNN ARNETT APRN

Nurse Practitioner

4545 R ST
LINCOLN, NE 68503

Lancaster County (402) 465-4545

GASTROENTEROLOGY SPECIALTIES, P.C.

Specialist

4545 R ST
LINCOLN, NE 68503

Lancaster County (402) 465-4545

DR. GARY W VARILEK MD

Internal Medicine (Gastroenterology)

4545 R ST
LINCOLN, NE 68503

Lancaster County (402) 465-4545

DR. MARK G GRIFFIN MD

Specialist

4545 R ST
LINCOLN, NE 68503

Lancaster County (402) 465-4545

SALLY KNOOIHUIZEN MD

Internal Medicine (Gastroenterology)

4545 R ST
LINCOLN, NE 68503

Lancaster County (402) 465-4545

DR. CYNTHIA R HAMMOND APRN DNP

Nurse Practitioner (Family)

4545 R ST
LINCOLN, NE 68503

Lancaster County (402) 465-4545

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 Clark Antonson's NPI number?

The NPI number for Clark Antonson is 1831182757. It was assigned to this individual provider in the NPPES registry on August 25, 2005.

Where is Clark Antonson located?

Clark Antonson practices at 4545 R St, Lincoln, NE 68503. The listed phone number is (402) 465-4545.

What is Clark Antonson's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Gastroenterology, with taxonomy code 207RG0100X.

Is Clark Antonson enrolled in Medicare?

Yes. Clark Antonson 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.

What insurance does Clark Antonson accept?

Health plans from Ambetter Health, Ambetter Health of Delaware, Ambetter from Home State Health, Ambetter from Sunflower Health Plan and Blue Cross and Blue Shield of Nebraska and 3 other insurers list Clark Antonson 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 Clark Antonson affiliated with any hospitals?

According to CMS data, Clark Antonson is affiliated with Bryan Medical Center, The Nebraska Medical Center, Chi Health St. Elizabeth, Jefferson Community Health & Life and Beatrice Community Hospital & Health Center, Inc.

When was this NPI record last updated?

The NPPES record for Clark Antonson was last updated on January 27, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 18 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.