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MR. IAN BEST M.D.
NPI 1659359248
Pediatrics in Marseilles, IL

Active since January 04, 2006PECOS Enrolled
580 SYCAMORE ST, MARSEILLES, IL 61341(815) 795-2122(815) 795-3507 Get Directions Write a Review

NPPES record last updated: February 25, 2020. Verified against the NPPES registry weekly; last sync: November 01, 2026.

About Mr. Ian Best M.d. NPPES

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

MR. IAN BEST M.D. (NPI 1659359248) is an individual pediatrics provider in Marseilles, Illinois, licensed in Illinois (036111569) and active in the NPI registry since January 2006. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1659359248
Entity TypeIndividualMale
Primary Taxonomy208000000X
Provider Legal NameMR. IAN BESTCredential: M.D.
Location Address580 SYCAMORE STMarseilles, IL 61341-1366
Mailing Address725 School St Ste AMorris, IL 60450-1207 · (815) 941-9124 · Fax (815) 941-4363
Phone(815) 795-2122
Fax(815) 795-3507
Sole ProprietorNo
Enumeration DateJanuary 4, 2006
Last NPPES UpdateFebruary 25, 2020
✔ NPI 1659359248 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPediatricsAllopathic & Osteopathic Physicians
Taxonomy Code208000000X
License✔ Licensed in IL · 036111569
Definition
A pediatrician is concerned with the physical, emotional and social health of children from birth to young adulthood. Care encompasses a broad spectrum of health services ranging from preventive healthcare to the diagnosis and treatment of acute and chronic diseases. A pediatrician deals with biological, social and environmental influences on the developing child, and with the impact of disease and dysfunction on development.
580 SYCAMORE ST, Marseilles, IL 61341
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Other Names 1

Other Name (5)Mr. Ian Best M.d.

Other Identifiers 1

Medicaid036111569IL

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter Health, Ambetter Health of Delaware.Insurance ›

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Mr. Ian Best M.d. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

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 Ian Best reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Morris Hospital
15 mi
General Practice
150 W HIGH ST
Morris, IL 60450
  • Reassigned Medicare billing, Illinois enrollment
  • 207 clinicians in this Medicare group
NPI 1558466268 (815) 942-2932

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 61341 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
$85.71 typical visit price
range $54.80 – $168.44
Typical copayment $21.42 (range $13.70 – $42.11)
Most-billed visit code 99203
Established Patient
$97.25 typical visit price
range $17.16 – $136.56
Typical copayment $24.31 (range $4.29 – $34.14)
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 2

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

DAWN M HARRIS LCSW
Social Worker (Clinical)
580 SYCAMORE ST
MARSEILLES, IL 61341
Lasalle County (815) 795-2122
DR. LLOYD M FLATT M.D.
Internal Medicine
580 SYCAMORE ST
MARSEILLES, IL 61341
Lasalle County (815) 795-2122

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 Ian Best's NPI number?

The NPI number for Ian Best is 1659359248. It was assigned to this individual provider in the NPPES registry on January 4, 2006. The provider is also known as Mr. Ian Best M.D..

Where is Ian Best located?

Ian Best practices at 580 Sycamore St, Marseilles, IL 61341. The listed phone number is (815) 795-2122.

What is Ian Best's specialty?

The primary specialty registered for this NPI is Pediatrics with taxonomy code 208000000X.

Is Ian Best enrolled in Medicare?

Yes. Ian Best is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Ian Best's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Ian Best reassigns Medicare benefits to Morris Hospital (Morris, IL). 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 Ian Best's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Ian Best accept?

Health plans from Ambetter Health and Ambetter Health of Delaware list Ian Best 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 Ian Best was last updated on February 25, 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.