Jonas Mieczyslaw Kwiatkowski, MD
Internal Medicine (CMS) · Mason City, IA
At a glance
1000 4Th St Sw, Mason City, IA 50401-2800
NPPES record updated Nov 3, 2025. Public records can lag behind changes at a practice.
Before you call: a quick checklist
- Are you accepting new patients?
- Do you accept my specific insurance plan?
- Do you provide the service I need at this address?
- Do I need a referral, and what is the earliest appointment?
Insurance participation and appointment availability are not established by these public records.
Medicare & insurance
Insurance participation is not established by these public records. Ask the practice and your insurer about your specific plan and this location.
How to check your coverage
Use your plan’s provider directory or the member-services number on your insurance card. Confirm the clinician, practice address, service, and whether a referral is required. A missing opt-out record does not establish Medicare acceptance.
Check the official Medicare directory ↗Practice location
1000 4Th St SwMason City, IA 50401-2800
Additional reported practice locations
2801 N Gantenbein AvePortland, OR 972271623
Phone: 5034138407
Education & affiliations
- Medical / professional school
- Not reported in this file
- Graduation year
- 2016
- CMS specialties
- Internal Medicine
Practice groups
Reported hospital affiliations
- Legacy Emanuel Medical Center Portland, OR
- Legacy Good Samaritan Medical Center Portland, OR
- Mercyone North Iowa Medical Center Mason City, IA
Graduation year does not establish years in practice. A reported affiliation does not establish employment, current admitting privileges, or insurance participation.
Source: CMS National Downloadable File · Published Oct 15, 2026.
Source: CMS Facility Affiliation Data · Published Oct 15, 2026.
Procedures in the public data
Reported activity can help you ask more informed questions about a practice’s services.
No displayed procedure-category record in this release. This does not mean the clinician performs no procedures.
CMS uses a one-year claims window with a reporting lag. Counts cover the Medicare activity included by CMS, not all patients. “1–10” is a published range. Volume is not a quality or outcomes score. Coverage and methodology
Source: CMS Utilization Data · Published Oct 15, 2026.
Find providers with a similar service mix
Compare 2024 published Medicare activity in the same reported specialty, here or in another city.
Industry-reported general payments
No matching general-payment summary in the imported release. This is not a verified zero and does not rule out other payment types or years.
Source: CMS 2025 payments grouped by covered recipient and nature of payments · Published Jun 30, 2026.
Professional details: NPI, taxonomy & registry record
Registry details
- Primary taxonomy
- Internal Medicine (CMS)
- Taxonomy code
- 208M00000X
- Enumeration date
- Aug 28, 2016
- Record updated
- Nov 3, 2025
More registry details
- Provider type
- Individual · Type 1
- Reported credentials
- MD
Reported taxonomies and licenses
208M00000X · Primary
License reported: MD-46838 IA
207R00000X
License reported: MD227509 OR
License numbers and credentials are reported to NPPES; HCPList does not independently verify them.
Practice location
1000 4Th St SwMason City, IA 50401-2800
- Phone
- (641) 428-5192
- Fax
- (641) 428-8041
Mailing address
1000 4TH ST SWMASON CITY, IA 504012800
Information may be outdated or incomplete. Confirm details directly with the practice. HCPList is an independent directory and is not affiliated with CMS.
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