JOHN CHARLES MICHALAK (M.D.) – Hematology & Oncology Physician, NPI 1497727663

JOHN CHARLES MICHALAK (M.D.) is a healthcare provider. based in Sioux city, Iowa. specializing in Hematology & Oncology Physician. They hold the professional credentials M.D.. They hold a License No. 21969 (IA). The NPI Number for JOHN CHARLES MICHALAK (M.D.) is 1497727663

Main info

Male
Name
JOHN CHARLES MICHALAK (M.D.)
NPI
1497727663
Phone
(712) 252-0088
Address
230 NEBRASKA ST
Enumeration Date
2 February 2006
Last Update Date
8 July 2007
Data current as of
19 May 2026

Profile Insights

NPPES metrics only — not quality of care.

Methodology
Experience54
Completeness75
Years active:20State licenses:1Digital endpointsOther names

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Provider Addresses for JOHN CHARLES MICHALAK (M.D.)

  • June E. Nylen Cancer Center, 230, Nebraska Street, Sioux City, Woodbury County, Iowa, 51101, United States

    SIOUX CITY, IA 511011733

    Phone: (712) 252-0088

    Fax: (712) 252-5271

    Mailing address matches the actual address.

NPPES updates history

No NPPES updates recorded for this provider.

Prescription Activity

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Open Payments (CMS)

CMS reports 1 Open Payments records for all available years, with a total value of $25.

Total Amount is formed as General ($25) + Research ($0) + Ownership ($0) = $25.

Last reported payment date: 2024-12-17 • Largest payer in this snapshot: PFIZER INC. ($25).

Total Amount

$25

General + Research + Ownership

Payments

1

Total payment records

General Amount

$25

General payments

Research Amount

$0

Research funding

Ownership Amount

$0

Ownership interests

Ownership Count

0

Ownership records

Last Payment Date

2024-12-17

Latest reported date

Top Companies

Largest payers in this snapshot

CompanyAmount
PFIZER INC.$25
View all Open Payments →|Open Payments Risk Radar →

Medicare Enrollment & Revalidation

Source: CMS public data · Not endorsed by CMS ·

Educational use only—not medical, billing, or legal advice.

No Medicare enrollment or revalidation data available for this provider in our database.

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Medicare Utilization (FFS)

Source: CMS public data · Not endorsed by CMS · Beneficiary counts under 11 are suppressed in source data ·

Educational use only—not medical, billing, or legal advice.

No Medicare fee-for-service utilization data available for this provider in our database.

Insurance plans in this area (ZIP 51101)

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Reviews

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Frequently asked questions

What is the 10-digit NPI for JOHN CHARLES MICHALAK (M.D.)?
JOHN CHARLES MICHALAK (M.D.) — NPI 1497727663 — is the standard way to identify this listing.
Does the file indicate JOHN CHARLES MICHALAK (M.D.) is practicing under active NPI?
Directory data currently reports JOHN CHARLES MICHALAK (M.D.) as active.
What healthcare role does JOHN CHARLES MICHALAK (M.D.) hold?
Scheduling teams often label JOHN CHARLES MICHALAK (M.D.) under Hematology & Oncology Physician. Clinical services aligned with this taxonomy classification.
Where should I expect JOHN CHARLES MICHALAK (M.D.) on a map?
Expect Sioux City, Iowa as a primary anchor for JOHN CHARLES MICHALAK (M.D.) unless the record lists multiple sites.
Is specialty guaranteed by NPI alone?
Taxonomy selections describe intent; scope of practice still follows state law.

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