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DR. NICHOLAS W FREDERICKSON M.D.
NPI 1154640225
Internal Medicine - Gastroenterology in Washington, MO

Active since May 27, 2010PECOS EnrolledAccepts Medicare Assignment
901 PATIENTS FIRST DRIVE SUITE 3300, WASHINGTON, MO 63090(636) 239-7344(636) 239-9436 Get Directions Write a Review

NPPES record last updated: January 14, 2020. Verified against the NPPES registry weekly; last sync: October 25, 2026.

About Dr. Nicholas W Frederickson M.d. NPPES

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

DR. NICHOLAS W FREDERICKSON M.D. (NPI 1154640225) is an individual gastroenterology provider in Washington, Missouri, licensed in Missouri (2016012330) and active in the NPI registry since May 2010. He is enrolled in Medicare PECOS, is affiliated with Mercy Hospital Washington, and is a graduate of Saint Louis University School Of Medicine (2010).

NPPES Registry Identity

NPI1154640225
Entity TypeIndividualMale
Primary Taxonomy207RG0100X
Provider Legal NameDR. NICHOLAS W FREDERICKSONCredential: M.D.
Location Address901 PATIENTS FIRST DRIVE SUITE 3300Washington, MO 63090
Mailing Address901 Patients First Drive Suite 3300Washington, MO 63090 · (636) 239-7344 · Fax (636) 239-9436
Phone(636) 239-7344
Fax(636) 239-9436
Sole ProprietorNo
Medical School CMSSaint Louis University School Of MedicineGraduated 2010
Enumeration DateMay 27, 2010
Last NPPES UpdateJanuary 14, 2020
✔ NPI 1154640225 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 MO · 2016012330
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 ListedInternal MedicineTaxonomy 207R00000X · License R-8906 (IA)
901 PATIENTS FIRST DRIVE SUITE 3300, Washington, MO 63090
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Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter from Arkansas Health & Wellness, Ambetter from Sunflower Health Plan, Ambetter Health 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

Dr. Nicholas W Frederickson M.d. 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 ID2264734680
PECOS Enrollment IDI20160707001341
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 Reassignment

Medicare enrollment records show Nicholas Frederickson reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Mercy Clinic Gastroenterology, LLC
32 mi
Gastroenterology
621 S NEW BALLAS RD, SUITE 437-A
Saint Louis, MO 63141
  • Reassigned Medicare billing, Missouri enrollment
  • 69 clinicians in this Medicare group
NPI 1528295334 (314) 251-3880

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 11

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.

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.
47 services43 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.
43 services43 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.
39 services39 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.
36 services36 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.
34 services34 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.
25 services25 patients

Hospital Affiliations CMS Care Compare 2

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

Mercy Hospital Washington

Acute Care Hospitals · Washington, MO
4/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number260052
Location901 East 5th StreetWashington, MO 63090 · Franklin County
Emergency services

Missouri Baptist Medical Center

Acute Care Hospitals · Town And Country, MO
5/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number260108
Location3015 N Ballas RdTown And Country, MO 63131 · St. Louis County
Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 63090 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
$121.96 typical visit price
range $52.28 – $161.24
Typical copayment $30.49 (range $13.07 – $40.31)
Most-billed visit code 99204
Established Patient
$93.24 typical visit price
range $16.30 – $131.05
Typical copayment $23.31 (range $4.07 – $32.76)
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.

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 Nicholas Frederickson's NPI number?

The NPI number for Nicholas Frederickson is 1154640225. It was assigned to this individual provider in the NPPES registry on May 27, 2010.

Where is Nicholas Frederickson located?

Nicholas Frederickson practices at 901 Patients First Drive Suite 3300, Washington, MO 63090. The listed phone number is (636) 239-7344.

What is Nicholas Frederickson's specialty?

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

Is Nicholas Frederickson enrolled in Medicare?

Yes. Nicholas Frederickson 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 organization bills Medicare for Nicholas Frederickson's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Nicholas Frederickson reassigns Medicare benefits to Mercy Clinic Gastroenterology, LLC (Saint Louis, MO). The 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 Nicholas Frederickson's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Nicholas Frederickson accept?

Health plans from Ambetter Health, Ambetter Health of Delaware, Ambetter from Arkansas Health & Wellness, Ambetter from Sunflower Health Plan and Ambetter of Oklahoma and 3 other insurers list Nicholas Frederickson 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 Nicholas Frederickson affiliated with any hospitals?

According to CMS data, Nicholas Frederickson is affiliated with Mercy Hospital Washington and Missouri Baptist Medical Center.

When was this NPI record last updated?

The NPPES record for Nicholas Frederickson was last updated on January 14, 2020. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 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.