Nickolas S Demark, DO
Hospice/Palliative Care · Internal Medicine (CMS) · Oskaloosa, IA
At a glance
1229 C Ave E, Oskaloosa, IA 52577-4246
NPPES record updated Jul 1, 2026. 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
1229 C Ave EOskaloosa, IA 52577-4246
Additional reported practice locations
1715 Dousman StGreen Bay, WI 543033211
Phone: 9204964700 1726 Shawano Ave
Green Bay, WI 543033216
Phone: 9204964700 130 2Nd St
Neenah, WI 549562883
Phone: 9207292738
Fax: 9207293021 900 Illinois Ave
Stevens Point, WI 544813114
Phone: 7153465000 1818 N Meade St
Appleton, WI 549113454
Phone: 9207357645
Fax: 9207357618 900 Illinois Ave
Stevens Point, WI 544813114
Phone: 7153465000
Education & affiliations
- Medical / professional school
- Des Moines University Of Osteopathic Medicine And Health Sciences
- Graduation year
- 2011
- CMS specialties
- Hospice/Palliative Care · Internal Medicine
Practice groups
Reported hospital affiliations
- Mahaska Health Partnership Oskaloosa, 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
- Hospice/Palliative Care · Internal Medicine (CMS)
- Taxonomy code
- 207RH0002X
- Enumeration date
- Jun 30, 2011
- Record updated
- Jul 1, 2026
More registry details
- Provider type
- Individual · Type 1
- Reported credentials
- DO
Reported taxonomies and licenses
208M00000X
License reported: 62482 WI
207R00000X
License reported: 62482 WI
207R00000X
License reported: 5101019580 MI
207RH0002X · Primary
License reported: DO-06639 IA
License numbers and credentials are reported to NPPES; HCPList does not independently verify them.
Practice location
1229 C Ave EOskaloosa, IA 52577-4246
- Phone
- (641) 672-3100
- Fax
- (641) 672-3381
Mailing address
1229 C AVE EOSKALOOSA, IA 525774298
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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