Nickolas S Demark, DO - Medicare Internal Medicine in Oskaloosa, IA

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Nickolas S Demark, DO is a medicare enrolled "Internal Medicine - Hospice And Palliative Medicine" physician in Oskaloosa, Iowa. His current practice location is 1229 C Ave E, Oskaloosa, Iowa. You can reach out to his office (for appointments etc.) via phone at (641) 672-3100.

Nickolas S Demark is licensed to practice in Iowa (license number DO-06639) and he also participates in the medicare program. He does not accept medicare assignments directly but he may accept medicare through third-party (refer to Reassignment section below) and may also prescribe medicare part D drugs. His NPI Number is 1114214004.

Contact Information

Nickolas S Demark, DO
1229 C Ave E,
Oskaloosa, IA 52577-4298
(641) 672-3100
Not Available

Map and Direction




Physician's Profile

Full NameNickolas S Demark
GenderMale
SpecialityInternal Medicine - Hospice And Palliative Medicine
Location1229 C Ave E, Oskaloosa, Iowa
Accepts Medicare AssignmentsMedicare enrolled and may accept medicare through third-party reassignment. May prescribe medicare part D drugs.
  NPI Data:
  • NPI Number: 1114214004
  • Provider Enumeration Date: 06/30/2011
  • Last Update Date: 09/11/2025
  Medicare PECOS Information:
  • PECOS PAC ID: 4880825363
  • Enrollment ID: I20240822000894

Medical Identifiers

Medical identifiers for Nickolas S Demark such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1114214004NPI-NPPES

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207R00000XInternal Medicine 5101019580 (Michigan)Secondary
208M00000XHospitalist 62482 (Wisconsin)Secondary
207R00000XInternal Medicine 62482 (Wisconsin)Secondary
207RH0002XInternal Medicine - Hospice And Palliative Medicine DO-06639 (Iowa)Primary

Medicare Part D Prescriber Enrollment

Any physician or other eligible professional who prescribes Part D drugs must either enroll in the Medicare program or opt out in order to prescribe drugs to their patients with Part D prescription drug benefit plans. Nickolas S Demark is enrolled with medicare and thus, if eligible, can prescribe medicare part D drugs to patients with medicare part D benefits.

Mailing Address and Practice Location

Mailing AddressPractice Location Address
Nickolas S Demark, DO
1229 C Ave E,
Oskaloosa, IA 52577-4298

Ph: (641) 672-3236		Nickolas S Demark, DO
1229 C Ave E,
Oskaloosa, IA 52577-4298

Ph: (641) 672-3100

Reviews and Comments


Internal Medicine Doctors in Oskaloosa, IA

Karen Anne Spahr, DO
Internal Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 1203 A Ave East, Oskaloosa, IA 52577
Phone: 641-672-9930    Fax: 641-672-9932
Kiron Viswambharan Nair, MD
Internal Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 1229 C Ave E, Oskaloosa, IA 52577
Phone: 641-672-3236    
Kyle Ramsay Witt, MD
Internal Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 1229 C Ave E, Oskaloosa, IA 52577
Phone: 641-672-3100    Fax: 641-672-3259

Medicare Program: Medicare is a federal government program which provides health insurance to people who are 65 or older. This program also covers certain younger people with disabilities (who receive Social Security Disability Insurance - SSDI), and people with End-Stage Renal Disease (permanent kidney failure requiring dialysis or a transplant, sometimes called ESRD.

Medicare Assignment: Assignment means that your doctor, provider, or supplier agrees (or is required by law) to accept the Medicare-approved amount as full payment for covered services. Most doctors, providers, and suppliers accept assignment, but you should always check to make sure. Participating providers have signed an agreement to accept assignment for all Medicare-covered services.

NPI Number: The National Provider Identifier (NPI) is a unique identification number for covered health care providers. The NPI must be used in lieu of legacy provider identifiers in the HIPAA standards transactions. Covered health care providers and all health plans and health care clearinghouses must use the NPIs in the administrative and financial transactions adopted under HIPAA (Health Insurance Portability and Accountability Act).

Our Data: Information on www.medicarelist.com is built using data sources published by Centers for Medicare & Medicaid Services (CMS) under Freedom of Information Act (FOIA). The information disclosed on the NPI Registry are FOIA-disclosable and are required to be disclosed under the FOIA and the eFOIA amendments to the FOIA. There is no way to 'opt out' or 'suppress' the NPPES record data for health care providers with active NPIs.