Trimark Physicians Group

Trimark Physicians Group is a healthcare organization registered as Rural Health Clinic/Center in Humboldt, IA, holding Type 2 (organization) NPI 1619246899 since 2011. The authorized official on file is Michael Dewerff, Cfo.

✓ Active NPI ✓ Valid NPI checksum Organization subpart

NPI	1619246899
Entity type	Organization (Type 2)
Legal business name	Trimark Physicians Group
Other name	<Unavail>
Parent organization	Trimark Physicians Group
Practice address	1010 15TH ST N, Humboldt, IA, 50548
Phone	5153322015
Fax	5153324211
Enumeration date	2011-12-18
Last updated in NPPES	2013-05-13

Authorized official

Name	Michael Dewerff
Title	Cfo
Phone	5155746603

Taxonomy & classification

Taxonomy code	Specialty	Primary	License	State
261QR1300X	Rural Health Clinic/Center	Primary	—	—

Copy-ready billing details

Provider: Trimark Physicians Group
NPI: 1619246899
Taxonomy: 261QR1300X (Rural Health Clinic/Center)
Address: 1010 15TH ST N, Humboldt, IA, 50548

Providers at this address

NPI	Name	Type	Specialty	Location
1629069786	David Ruzicka	Individual	Emergency Medicine Physician	Humboldt, IA
1992781082	Trimark Physicians Group Inc	Organization	Rural Health Clinic/Center	Humboldt, IA
1326010794	Laine Dvorak	Individual	Family Medicine Physician	Humboldt, IA
1710959937	Sherry Bulten	Individual	Family Medicine Physician	Humboldt, IA
1629040951	Sharmini Rasakulasuriar	Individual	Internal Medicine Physician	Humboldt, IA
1518939693	Sue Malloy	Individual	Nurse Practitioner	Humboldt, IA
1013065341	Robert Mcpeak	Individual	Physician Assistant	Humboldt, IA
1952682395	Christine Vitzthum	Individual	Family Nurse Practitioner	Humboldt, IA

Verify this record

Cross-check NPI 1619246899 against the authoritative CMS record: view Trimark Physicians Group on the official NPPES registry .

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes — even if the provider moves or changes specialty. Read the full guide or validate an NPI number.

Frequently asked questions

How current is this record?

Data comes from the CMS NPPES public dissemination file; this record was last updated in NPPES on 2013-05-13. Verify at npiregistry.cms.hhs.gov.

Where is Trimark Physicians Group located?

The practice location on file with NPPES is in Humboldt, IA.

Source: CMS NPPES (public data). Snapshot 2026-07-11. Provider record last updated 2013-05-13.