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CHESTERFIELD INTERNAL MEDICINE AND RHEUMATOLOGY, LLC
NPI 1659463941
Internal Medicine in Chesterfield, MO

Active since September 28, 2006CLIA 26D0940905 · Waiver
226 S WOODS MILL RD STE 43, CHESTERFIELD, MO 63017(314) 205-6444(314) 590-5924 Get Directions Write a Review

NPPES record last updated: March 5, 2026. Verified against the NPPES registry weekly; last sync: November 01, 2026.

Record update history: Mar 5, 2026, Dec 12, 2025, Dec 4, 2020 (3 updates tracked since 2020).

About Chesterfield Internal Medicine And Rheumatology, Llc NPPES

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

CHESTERFIELD INTERNAL MEDICINE AND RHEUMATOLOGY, LLC (NPI 1659463941) is a healthcare organization registered as an internal medicine in Chesterfield, Missouri and active in the NPI registry since September 2006. The organization holds a CLIA Waiver certificate valid through February 17, 2028 and lists Darren Haskell, Chief Medical Officer, as its authorized official.

NPPES Registry Identity

NPI1659463941
Entity TypeOrganization
Primary Taxonomy207R00000X
Legal Business NameCHESTERFIELD INTERNAL MEDICINE AND RHEUMATOLOGY, LLC
Location Address226 S WOODS MILL RD STE 43Chesterfield, MO 63017-3663
Mailing Address232 S Woods Mill RdChesterfield, MO 63017-3406 · (636) 685-7804
Phone(314) 205-6444
Fax(314) 590-5924
Organization SubpartYesParent: St. Lukes Medical Group
Authorized OfficialDarren HaskellChief Medical Officer · (314) 205-6444
Enumeration DateSeptember 28, 2006
Last NPPES UpdateMarch 5, 20263 updates tracked since enumeration
NPPES CertifiedMarch 5, 2026
✔ NPI 1659463941 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
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 ListedInternal Medicine · RheumatologyTaxonomy 207RR0500X
226 S WOODS MILL RD STE 43, Chesterfield, MO 63017
Open in Google Maps ↗

Other Identifiers 1

OtherDD5556MO · Medicare Railroad

Group Practice 1

Group TaxonomyThis provider is a business group of one or more individual practitioners, who practice with different areas of specialization.193200000X MULTI-SPECIALTY GROUP

Accepted Insurance

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

Medicare Participation & PECOS CMS

Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Chesterfield Internal Medicine And Rheumatology, Llc is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Clinicians Billing Medicare Through This Organization

11

Medicare enrollment records show 11 clinicians reassign Medicare billing to Chesterfield Internal Medicine And Rheumatology, LLC, which bills Medicare for the services they deliver. Of these, 6 practice at this address and 10 within 10 miles. They are listed nearest first.

Clinicians by Medicare Specialty 4

Internal Medicine5
Nurse Practitioner3
Rheumatology2
Endocrinology1

Clinicians, nearest first (11)

Kelly Iqbal
Nurse Practitioner
NPI 1700219862
226 S WOODS MILL RD 43 WEST
Chesterfield, MO 63017
(314) 205-6444
✔ PECOS✔ Accepts MedicareSame address
Surajit Majumdar, MD, FACP
Internal Medicine
NPI 1548216179
226 SOUTH WOODS MILL RD. STE 43 WEST
Chesterfield, MO 63017
(314) 205-6444
✔ PECOS✔ Accepts MedicareSame address
Lainey Ogle
Nurse Practitioner
NPI 1003639600
226 S. WOODS MILL RD. SUITE 43
Chesterfield, MO 63017
(314) 205-6444
✔ PECOS✔ Accepts MedicareSame address
Darren Haskell, M.D.
Internal Medicine
NPI 1689636813
226 S WOODS MILL RD SUITE 43 WEST
Chesterfield, MO 63017
(314) 205-6444
✔ PECOS✔ Accepts MedicareSame address
Richard Kozeny, MD
Internal Medicine
NPI 1255319810
226 S WOODS MILL RD STE 43 W
Chesterfield, MO 63017
(314) 205-6444
✔ PECOS✔ Accepts MedicareSame address
Scott Thouvenot
Nurse Practitioner
NPI 1669844932
226 S WOODS MILL RD SUITE 43 WEST
Chesterfield, MO 63017
(314) 205-6444
✔ PECOS✔ Accepts MedicareSame address
Faye Cohen, M.D.
Rheumatology
NPI 1306808548
226 S WOODS MILL RD STE 43
Chesterfield, MO 63017
(314) 205-6444
✔ PECOS✔ Accepts Medicare0.7 mi
James Esther, M.D.
Rheumatology
NPI 1609838309
226 S WOODS MILL RD STE 43
Chesterfield, MO 63017
(314) 205-6444
✔ PECOS✔ Accepts Medicare0.7 mi
Veronica Kim, MD
Endocrinology
NPI 1710949458
1044 N MASON RD DIV IM ENDOCRINOLOGY, STE 330
Saint Louis, MO 63141
(314) 362-3500
✔ PECOS✔ Accepts Medicare2.5 mi
Nicholas Trottier, MD, MPH
Internal Medicine
NPI 1558859199
621 S NEW BALLAS RD
Saint Louis, MO 63141
(314) 251-6000
✔ PECOS3.4 mi
Daniela Blum Morales, MD
Internal Medicine
NPI 1730561069
2223 TECHNOLOGY DR STE 40
O Fallon, MO 63368
(636) 755-4400
✔ PECOS✔ Accepts Medicare15 mi

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

CLIA Laboratory Certificates CMS CLIA

Laboratory certificates issued under the Clinical Laboratory Improvement Amendments (CLIA) program, which sets federal quality standards for human laboratory testing in the United States. There is no official CMS crosswalk between CLIA and NPI numbers; these certificates are associated with this NPI by matching facility names, locations and phone numbers in the CMS CLIA registry.

Certificate of Waiver 26D0940905

Chesterfield Internal Medicine And Rheumatology · Chesterfield, MO
Active · expires Feb 17, 2028
CLIA Number26D0940905
Laboratory TypePhysician Office
Certificate Effective DateFebruary 18, 2026
Certificate Expiration DateFebruary 17, 2028
Laboratory DirectorJames H. Esther
Laboratory Phone(314) 205-0300
Laboratory LocationChesterfield Internal Medicine And Rheumatology226 South Woods Mill Road Ste 43 W, Chesterfield, MO 63017
CLIA data matches this NPI record on: Address Name
This certificate is issued to a laboratory to perform only waived tests.

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 Chesterfield Internal Medicine And Rheumatology, LLC's NPI number?

The NPI number for Chesterfield Internal Medicine And Rheumatology, LLC is 1659463941. It was assigned to this organization in the NPPES registry on September 28, 2006.

Where is Chesterfield Internal Medicine And Rheumatology, LLC located?

Chesterfield Internal Medicine And Rheumatology, LLC is located at 226 S Woods Mill Rd Ste 43, Chesterfield, MO 63017. The listed phone number is (314) 205-6444.

What is Chesterfield Internal Medicine And Rheumatology, LLC's specialty?

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

Is Chesterfield Internal Medicine And Rheumatology, LLC enrolled in Medicare?

Yes. Chesterfield Internal Medicine And Rheumatology, LLC is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through Chesterfield Internal Medicine And Rheumatology, LLC?

According to the CMS Revalidation Reassignment List (October 2026 release), 11 clinicians in 4 Medicare specialties reassign their Medicare billing to Chesterfield Internal Medicine And Rheumatology, LLC. A 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 the clinician's services. The largest specialties are Internal Medicine (5), Nurse Practitioner (3) and Rheumatology (2). Of these, 6 practice at this address and 10 within 10 miles. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Does Chesterfield Internal Medicine And Rheumatology, LLC hold a CLIA laboratory certificate?

Yes. A Certificate of Waiver (number 26D0940905) is associated with this NPI, valid through February 17, 2028. CLIA certificates authorize laboratory testing under the federal Clinical Laboratory Improvement Amendments program.

What insurance does Chesterfield Internal Medicine And Rheumatology, LLC accept?

Health plans from Anthem Blue Cross and Blue Shield and Medica list Chesterfield Internal Medicine And Rheumatology, LLC 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 Chesterfield Internal Medicine And Rheumatology, LLC was last updated on March 5, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 8 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.