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DR. NICHOLAS JOSEPH TROTTIER MD, MPH
NPI 1558859199
Internal Medicine in Saint Louis, MO

Active since April 30, 2018PECOS Enrolled
621 S NEW BALLAS RD, SAINT LOUIS, MO 63141(314) 251-6000 Get Directions Write a Review

NPPES record last updated: June 14, 2023. Verified against the NPPES registry weekly; last sync: November 01, 2026.

Record update history: Jun 14, 2023, Jan 7, 2022, Mar 5, 2019 and 1 more (4 updates tracked since 2018).

About Dr. Nicholas Joseph Trottier Md, Mph NPPES

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

DR. NICHOLAS JOSEPH TROTTIER MD, MPH (NPI 1558859199) is an individual internal medicine provider in Saint Louis, Missouri, licensed in Missouri (2019029014) and active in the NPI registry since April 2018. He is enrolled in Medicare PECOS and is a graduate of Saint Louis University School Of Medicine (2022).

NPPES Registry Identity

NPI1558859199
Entity TypeIndividualMale
Primary Taxonomy207R00000X
Provider Legal NameDR. NICHOLAS JOSEPH TROTTIERCredential: MD, MPH
Location Address621 S NEW BALLAS RDSaint Louis, MO 63141-8232
Mailing Address621 S New Ballas RdSaint Louis, MO 63141-8232
Phone(314) 251-6000
Sole ProprietorNo
Medical School CMSSaint Louis University School Of MedicineGraduated 2022
Enumeration DateApril 30, 2018
Last NPPES UpdateJune 14, 20234 updates tracked since enumeration
NPPES CertifiedJune 14, 2023
✔ NPI 1558859199 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 3

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
License✔ Licensed in MO · 2019029014
Definition
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
Also ListedGeneral PracticeTaxonomy 208D00000X · License 2019029014 (MO)
Also ListedStudent in an Organized Health Care Education/Training ProgramTaxonomy 390200000X
621 S NEW BALLAS RD, Saint Louis, MO 63141
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Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Anthem Blue Cross and Blue Shield, Medica, Oscar Insurance Company.Insurance ›

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Nicholas Joseph Trottier Md, Mph is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

PECOS PAC ID3870953680
PECOS Enrollment IDI20260714003637
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 Trottier reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Chesterfield Internal Medicine And Rheumatology, LLC
3.4 mi
Internal Medicine
226 S WOODS MILL RD STE 43
Chesterfield, MO 63017
  • Reassigned Medicare billing, Missouri enrollment
  • 11 clinicians in this Medicare group
NPI 1659463941 (314) 205-6444

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

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 63141 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
$128.28 typical visit price
range $55.65 – $169.38
Typical copayment $32.07 (range $13.91 – $42.34)
Most-billed visit code 99204
Established Patient
$98.37 typical visit price
range $17.76 – $137.92
Typical copayment $24.59 (range $4.44 – $34.48)
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.

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.

STEPHANIE LYNN SHOREY WHNP-BC
Nurse Practitioner (Women's Health)
621 S NEW BALLAS RD, SUITE 2007B
SAINT LOUIS, MO 63141
St. Louis County (314) 991-5000
DR. KATHRYN BOTNEY M.D.
Obstetrics & Gynecology
621 S NEW BALLAS RD, SUITE 4005
SAINT LOUIS, MO 63141
St. Louis County (314) 567-5016
HUILIN LI M.D.
Internal Medicine
621 S NEW BALLAS RD, SUITE 3016B
SAINT LOUIS, MO 63141
St. Louis County (314) 251-6339
LUIS A GIUFFRA LLC
Psychiatry & Neurology (Psychiatry)
621 S NEW BALLAS RD, SUITE 398A
SAINT LOUIS, MO 63141
St. Louis County (314) 251-7720
JOSEPH G HERRMANN MD LLC
Specialist
621 S NEW BALLAS RD, SUITE 419A
SAINT LOUIS, MO 63141
St. Louis County (314) 432-0056
KAREN KILO RN, CDE, RD
Nutritionist (Nutrition, Education)
621 S NEW BALLAS RD, SUITE 460A
SAINT LOUIS, MO 63141
St. Louis County (314) 251-4330
KATINA M CANDEE PA-C
Physician Assistant
621 S NEW BALLAS RD, SUITE 483A
SAINT LOUIS, MO 63141
St. Louis County (314) 251-2095
DR. PETER KONG-WOO YOON M.D.
Specialist
621 S NEW BALLAS RD, STE 297A
SAINT LOUIS, MO 63141
St. Louis County (314) 251-6364

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 Trottier's NPI number?

The NPI number for Nicholas Trottier is 1558859199. It was assigned to this individual provider in the NPPES registry on April 30, 2018.

Where is Nicholas Trottier located?

Nicholas Trottier practices at 621 S New Ballas Rd, Saint Louis, MO 63141. The listed phone number is (314) 251-6000.

What is Nicholas Trottier's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Is Nicholas Trottier enrolled in Medicare?

Yes. Nicholas Trottier is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Nicholas Trottier's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Nicholas Trottier reassigns Medicare benefits to Chesterfield Internal Medicine And Rheumatology, LLC (Chesterfield, 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 Trottier's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Nicholas Trottier accept?

Health plans from Anthem Blue Cross and Blue Shield, Medica and Oscar Insurance Company list Nicholas Trottier 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.

When was this NPI record last updated?

The NPPES record for Nicholas Trottier was last updated on June 14, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.