AARON LEONARD KLEIN M.D.
NPI 1467623082
Pathology - Anatomic Pathology & Clinical Pathology in Mount Vernon, IL

Q: What is Aaron Klein's NPI number?

The NPI number for Aaron Klein is 1467623082. It was assigned to this individual provider in the NPPES registry on March 23, 2008.

Q: What is Aaron Klein's specialty?

The primary specialty registered for this NPI is Pathology, specializing in Anatomic Pathology & Clinical Pathology, with taxonomy code 207ZP0102X.

Q: When was this NPI record last updated?

The NPPES record for Aaron Klein was last updated on January 2, 2014. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 12 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.

Active since March 23, 2008PECOS EnrolledAccepts Medicare Assignment

1 GOOD SAMARITAN WAY, DEPARTMENT OF PATHOLOGY, MOUNT VERNON, IL 62864(618) 899-1994 Get Directions Write a Review

NPPES record last updated: January 2, 2014. Verified against the NPPES registry weekly; last sync: October 18, 2026.

On this page

About Aaron Leonard Klein M.d. NPPES

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

AARON LEONARD KLEIN M.D. (NPI 1467623082) is an individual anatomic pathology & clinical pathology provider in Mount Vernon, Illinois, licensed in Illinois (036133987) and active in the NPI registry since March 2008. He is enrolled in Medicare PECOS and is a graduate of Other (2008).

NPPES Registry Identity

NPI1467623082

Entity TypeIndividualMale

Primary Taxonomy207ZP0102X

Provider Legal NameAARON LEONARD KLEINCredential: M.D.

Location Address1 GOOD SAMARITAN WAY, DEPARTMENT OF PATHOLOGYMount Vernon, IL 62864-2402

Mailing Address1 Good Samaritan Way, Department Of PathologyMount Vernon, IL 62864-2402 · (618) 899-1994

Phone(618) 899-1994

Sole ProprietorNo

Medical School CMSOtherGraduated 2008

Enumeration DateMarch 23, 2008

Last NPPES UpdateJanuary 2, 2014

✔ NPI 1467623082 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPathology · Anatomic Pathology & Clinical PathologyAllopathic & Osteopathic Physicians

Taxonomy Code207ZP0102X

License✔ Licensed in IL · 036133987

Definition

A pathologist deals with the causes and nature of disease and contributes to diagnosis, prognosis and treatment through knowledge gained by the laboratory application of the biologic, chemical and physical sciences. A pathologist uses information gathered from the microscopic examination of tissue specimens, cells and body fluids, and from clinical laboratory tests on body fluids and secretions for the diagnosis, exclusion and monitoring of disease.

1 GOOD SAMARITAN WAY, Mount Vernon, IL 62864

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Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Oscar Insurance Company, Wellmark Health Plan of Iowa, Inc..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

Aaron Leonard Klein 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 ID5890922801

PECOS Enrollment IDI20180807003626

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 Reassignments

Medicare enrollment records show Aaron Klein reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Urological Associates PC

240 mi

Non-Pharmacy Dispensing Site

3319 SPRING ST STE 202
Davenport, IA 52807

Reassigned Medicare billing, Iowa and Illinois enrollments
22 clinicians in this Medicare group

NPI 1346229192 (563) 359-1641

Cross Medical Laboratories LLP

270 mi

Anatomic Pathology & Clinical Pathology

321 E MARKET ST STE 102
Iowa City, IA 52245

Reassigned Medicare billing, Iowa enrollment
4 clinicians in this Medicare group

NPI 1568526713 (319) 337-7284

New Gi PC

342 mi

Gastroenterology

1015 S HACKETT RD
Waterloo, IA 50701

Reassigned Medicare billing, Iowa enrollment
31 clinicians in this Medicare group

NPI 1427996404 (319) 234-5990

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 2

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.

Pathology examination of tissue using a microscope, intermediate complexity 88305

A pathology examination of tissue with intermediate complexity involves studying a small sample of your body tissue under a microscope. This helps in identifying any abnormal cells or signs of disease. It's a detailed process requiring expert analysis to ensure accurate results.

2,646 services545 patients

Special stained specimen slides to examine tissue, initial procedure 88342

This procedure involves the use of specially stained slides to examine tissue samples. The initial process involves obtaining a small tissue sample from your body. This sample is then placed on a slide and stained with special dyes to highlight different structures and elements. The stained slide is then examined under a microscope to help diagnose any potential health issues.

17 services16 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 62864 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

$127.46 typical visit price

range $54.80 – $168.44

Typical copayment $31.86 (range $13.70 – $42.11)

Most-billed visit code 99204

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 20

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

DR. EMMANUEL LOUTRIANAKIS MD

Internal Medicine (Interventional Cardiology)

1 GOOD SAMARITAN WAY
MOUNT VERNON, IL 62864

Jefferson County (847) 736-0506

DR. QING KEVIN LUO M.D.

Internal Medicine

1 GOOD SAMARITAN WAY
MOUNT VERNON, IL 62864

Jefferson County (618) 242-4600

GOOD SAMARITAN REGIONAL HEALTH CENTER

Rehabilitation Unit

1 GOOD SAMARITAN WAY
MOUNT VERNON, IL 62864

Jefferson County (618) 242-4600

ADELAIDE HORCHER M.D.

Pathology (Anatomic Pathology & Clinical Pathology)

1 GOOD SAMARITAN WAY
MOUNT VERNON, IL 62864

Jefferson County (618) 242-4600

MRS. JILL CLARKE PHARM. D.

Pharmacist

1 GOOD SAMARITAN WAY
MOUNT VERNON, IL 62864

Jefferson County (618) 899-3426

KENT S QUINN MD

Radiology (Body Imaging)

1 GOOD SAMARITAN WAY, ATTN RADIOLOGY DEPT
MOUNT VERNON, IL 62864

Jefferson County (618) 242-4600

GOOD SAMARITAN REGIONAL HEALTH CENTER

Specialist

1 GOOD SAMARITAN WAY
MOUNT VERNON, IL 62864

Jefferson County (618) 899-4600

DEREK BURNS PHARMD

Pharmacist

1 GOOD SAMARITAN WAY
MOUNT VERNON, IL 62864

Jefferson County (618) 899-3426

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 Aaron Klein's NPI number?

The NPI number for Aaron Klein is 1467623082. It was assigned to this individual provider in the NPPES registry on March 23, 2008.

Where is Aaron Klein located?

Aaron Klein practices at 1 Good Samaritan Way Department Of Pathology, Mount Vernon, IL 62864. The listed phone number is (618) 899-1994.

What is Aaron Klein's specialty?

The primary specialty registered for this NPI is Pathology, specializing in Anatomic Pathology & Clinical Pathology, with taxonomy code 207ZP0102X.

Is Aaron Klein enrolled in Medicare?

Yes. Aaron Klein 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 organizations bill Medicare for Aaron Klein's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Aaron Klein reassigns Medicare benefits to 3 organizations: Urological Associates PC (Davenport, IA), Cross Medical Laboratories LLP (Iowa City, IA) and New Gi PC (Waterloo, IA). Each 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 Aaron Klein's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Aaron Klein accept?

Health plans from Oscar Insurance Company and Wellmark Health Plan of Iowa, Inc. list Aaron Klein 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 Aaron Klein was last updated on January 2, 2014. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 12 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.