Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

DR. JOHN OAK MD
NPI 1124026646
Internal Medicine - Cardiovascular Disease in Evansville, IN

Q: What is John Oak's NPI number?

The NPI number for John Oak is 1124026646. It was assigned to this individual provider in the NPPES registry on July 8, 2005.

Q: What is John Oak's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Cardiovascular Disease, with taxonomy code 207RC0000X.

Q: When was this NPI record last updated?

The NPPES record for John Oak was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 27 days 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 July 08, 2005PECOS Enrolled

1400 PROFESSIONAL BLVD, EVANSVILLE, IN 47714(812) 473-2642(812) 474-4458 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: August 02, 2026.

On this page

About Dr. John Oak Md NPPES

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

DR. JOHN OAK MD (NPI 1124026646) is an individual cardiovascular disease provider in Evansville, Indiana, licensed in Indiana (01027388A) and active in the NPI registry since July 2005. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1124026646

Entity TypeIndividualMale

Primary Taxonomy207RC0000X

Provider Legal NameDR. JOHN OAKCredential: MD

Location Address1400 PROFESSIONAL BLVDEvansville, IN 47714-8005

Mailing Address1400 Professional BlvdEvansville, IN 47714-8005 · (812) 473-2642 · Fax (812) 474-4458

Phone(812) 473-2642

Fax(812) 474-4458

Sole ProprietorNo

Enumeration DateJuly 8, 2005

Last NPPES UpdateJuly 13, 2026

✔ NPI 1124026646 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · Cardiovascular DiseaseAllopathic & Osteopathic Physicians

Taxonomy Code207RC0000X

License✔ Licensed in IN · 01027388A

Definition

An internist who specializes in diseases of the heart and blood vessels and manages complex cardiac conditions such as heart attacks and life-threatening, abnormal heartbeat rhythms.

1400 PROFESSIONAL BLVD, Evansville, IN 47714

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Other Identifiers 2

Medicaid0080167091IL

Medicaid64164619KY

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. John Oak Md 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.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 47714 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

$122.49 typical visit price

range $53.07 – $161.76

Typical copayment $30.62 (range $13.26 – $40.44)

Most-billed visit code 99204

Established Patient

$66.48 typical visit price

range $16.93 – $132.22

Typical copayment $16.62 (range $4.23 – $33.05)

Most-billed visit code 99213

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 4

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

MR. BRAD MENKE

Occupational Therapist

1400 PROFESSIONAL BLVD
EVANSVILLE, IN 47714

Vanderburgh County (812) 485-7121

CAROL JONES CFA/CST

Specialist/Technologist, Other (Surgical Technologist)

1400 PROFESSIONAL BLVD
EVANSVILLE, IN 47714

Vanderburgh County (812) 473-2642

ERIC MCCORMICK CFA/CST

Specialist/Technologist, Other (Surgical Technologist)

1400 PROFESSIONAL BLVD
EVANSVILLE, IN 47714

Vanderburgh County (812) 473-2642

LISA BEASLEY

Specialist/Technologist, Other (Surgical Technologist)

1400 PROFESSIONAL BLVD
EVANSVILLE, IN 47714

Vanderburgh County (812) 473-2642

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 John Oak's NPI number?

The NPI number for John Oak is 1124026646. It was assigned to this individual provider in the NPPES registry on July 8, 2005.

Where is John Oak located?

John Oak practices at 1400 Professional Blvd, Evansville, IN 47714. The listed phone number is (812) 473-2642.

What is John Oak's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Cardiovascular Disease, with taxonomy code 207RC0000X.

Is John Oak enrolled in Medicare?

Yes. John Oak is registered in the Medicare PECOS enrollment system.

When was this NPI record last updated?

The NPPES record for John Oak was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 27 days 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.