William I Parker, MD - Medicare Emergency Medicine in Mason City, IA

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William I Parker, MD is a medicare enrolled "Emergency Medicine" physician in Mason City, Iowa. He graduated from medical school in 1991 and has 34 years of diverse experience with area of expertise as Emergency Medicine. He is a member of the group practice Kossuth Regional Health Center, Emergency Medicine Services Of Fl Llc and his current practice location is 1000 4th St Sw, Suite Er, Mason City, Iowa. You can reach out to his office (for appointments etc.) via phone at (641) 422-7234.

William I Parker is licensed to practice in Iowa (license number 28723) and he also participates in the medicare program. He may accept medicare assignments (which means he may accept the Medicare-approved amount; you may be billed for more than the Medicare deductible and coinsurance) and his NPI Number is 1356459903.

Contact Information

William I Parker, MD
1000 4th St Sw, Suite Er,
Mason City, IA 50401-2800
(641) 422-7234
(641) 422-6373

Map and Direction




Physician's Profile

Full NameWilliam I Parker
GenderMale
SpecialityEmergency Medicine
Experience34 Years
Location1000 4th St Sw, Mason City, Iowa
Accepts Medicare AssignmentsMay be. He may accept the Medicare-approved amount; you may be billed for more than the Medicare deductible and coinsurance.
  Medical Education and Training:
  • William I Parker graduated from medical school in 1991
  NPI Data:
  • NPI Number: 1356459903
  • Provider Enumeration Date: 08/25/2006
  • Last Update Date: 10/11/2023
  Medicare PECOS Information:
  • PECOS PAC ID: 6800783044
  • Enrollment ID: I20040302000687

Medical Identifiers

Medical identifiers for William I Parker such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1356459903NPI-NPPES
2073189MedicaidIA
47792OtherIAWELLMARK

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207P00000XEmergency Medicine 28723 (Iowa)Primary

Medical Facilities Affiliation

Facility NameLocationFacility Type
Mercyone North Iowa Medical CenterMason city, IAHospital
Englewood Community HospitalEnglewood, FLHospital
Kossuth Regional Health CenterAlgona, IAHospital

Group Practice Association

Group Practice NameGroup PECOS PAC IDNo. of Members
Kossuth Regional Health Center337545425919
Emergency Medicine Services Of Fl Llc8426413931491

Medicare Reassignments

Some practitioners may not bill the customers directly but medicare billing happens through clinics / group practice / hospitals where the provider works. Medicare reassignment of benefits is a mechanism by which practitioners allow third parties to bill and receive payment for medicare services performed by them. William I Parker allows following entities to bill medicare on his behalf.
Entity NameNorth Iowa Mercy Clinics
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1780278242
PECOS PAC ID: 7810809076
Enrollment ID: O20031105000273
Entity NameLakes Regional Healthcare
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1336291160
PECOS PAC ID: 0941118442
Enrollment ID: O20031223000386
Entity NameSpencer Municipal Hospital
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1396732186
PECOS PAC ID: 4183533060
Enrollment ID: O20040128000325
Entity NameKossuth Regional Health Center
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1184636557
PECOS PAC ID: 3375454259
Enrollment ID: O20040319000696

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. William I Parker 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
William I Parker, MD
621 S Illinois Ave, Suite 103,
Mason City, IA 50401-5489

Ph: (641) 494-3041		William I Parker, MD
1000 4th St Sw, Suite Er,
Mason City, IA 50401-2800

Ph: (641) 422-7234

Reviews and Comments


Emergency Medicine Doctors in Mason City, IA

Dr. Satinderjit Singh, M.D.
Emergency Medicine
Medicare: Medicare Enrolled
Practice Location: 1000 4th St Sw, Mason City, IA 50401
Phone: 641-428-7234    Fax: 641-428-6373
Paul H Gordon, MD
Emergency Medicine
Medicare: Not Enrolled in Medicare
Practice Location: 1010 4th St Sw, Mason City, IA 50401
Phone: 641-422-6020    Fax: 641-422-7803
Dr. Brian Michael Kuchay, M.D.
Emergency Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 621 S Illinois Ave, Mason City, IA 50401
Phone: 641-428-7234    
Tavi J Madden-leduc, DO
Emergency Medicine
Medicare: Medicare Enrolled
Practice Location: 1000 4th St Sw, Mason City, IA 50401
Phone: 641-422-7234    Fax: 641-422-6373
Dr. Rajendra Singh, MD
Emergency Medicine
Medicare: Medicare Enrolled
Practice Location: 1000 4th St Sw, Suite Er, Mason City, IA 50401
Phone: 641-422-7234    Fax: 641-422-6373
Dr. Matthew J Schiller, MD
Emergency Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 1000 4th St Sw, Suite Er, Mason City, IA 50401
Phone: 641-422-7234    Fax: 641-422-6373

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.