Dr. William I. Parker
- Gender: Male
- Experience: 30 years
- Sole propriator: No
- NPI: 1356459903
Dr. William I. Parker MD
Emergency Physician
He is located at 1000 4th Street Southwest Suite Er in Mason City, IA 50401. Can help patients with the following: Choking, Febrile Seizure, Insect Stings, Phlebitis and Thrombophlebitis, Prescription Refill, Whiplash. His National Provider Identifier (NPI) number is 1356459903. Appointment can be made via the phone number (641) 422-7234.
Conditions treated
Dr. William I. Parker, being an emergency physician, treats the following conditions. Please be advised that this list may not be complete. For the full list of conditions treated, consult directly with Dr. William I. Parker.
- Acute Pain
- Altitude Sickness
- Angina
- Brain Aneurysm
- Brain Hemorrhage
- Broken Bone
- Bruises
- Choking
- Common Cold
- Coronavirus
- Costochondritis
- Febrile Seizure
- Fever
- Frostbite
- General Care
- Headache
- Hematoma
- Influenza
- Insect Stings
- Laceration
- Migraine
- Nausea and Vomiting
- Phlebitis and Thrombophlebitis
- Prescription Refill
- Whiplash
ACA Marketplace (Obamacare/HealthCare.gov) plan networks
Insurers selling ACA Marketplace (HealthCare.gov) plans list Dr. William I. Parker as in-network for the following 2026 plans.
Health plans
Medica
Network data as of Jan 26, 2026, as reported by the insurer.
Show all 27 plans from Medica
| Plan | Plan type | Network tier | New patients |
|---|---|---|---|
| Medica Insure Bronze $0 Copay PCP Visits | EPO · Expanded Bronze | Preferred | Accepting new patients |
| Medica Insure Bronze $0 Copay PCP Visits | EPO · Expanded Bronze | Preferredtier | Accepting new patients |
| Medica Insure Bronze $0 Copay PCP Visits | EPO · Expanded Bronze | Standardtier | Accepting new patients |
| Medica Insure Bronze Share | EPO · Expanded Bronze | Preferred | Accepting new patients |
| Medica Insure Bronze Share | EPO · Expanded Bronze | Preferredtier | Accepting new patients |
| Medica Insure Bronze Share | EPO · Expanded Bronze | Standardtier | Accepting new patients |
| Medica Insure Expanded Bronze Standard | EPO · Expanded Bronze | Preferred | Accepting new patients |
| Medica Insure Expanded Bronze Standard | EPO · Expanded Bronze | Preferredtier | Accepting new patients |
| Medica Insure Expanded Bronze Standard | EPO · Expanded Bronze | Standardtier | Accepting new patients |
| Medica Insure Gold $0 Copay PCP Visits | EPO · Gold | Preferred | Accepting new patients |
| Medica Insure Gold $0 Copay PCP Visits | EPO · Gold | Preferredtier | Accepting new patients |
| Medica Insure Gold $0 Copay PCP Visits | EPO · Gold | Standardtier | Accepting new patients |
| Medica Insure Gold Share | EPO · Gold | Preferred | Accepting new patients |
| Medica Insure Gold Share | EPO · Gold | Preferredtier | Accepting new patients |
| Medica Insure Gold Share | EPO · Gold | Standardtier | Accepting new patients |
| Medica Insure Gold Standard | EPO · Gold | Preferred | Accepting new patients |
| Medica Insure Gold Standard | EPO · Gold | Preferredtier | Accepting new patients |
| Medica Insure Gold Standard | EPO · Gold | Standardtier | Accepting new patients |
| Medica Insure Silver $0 Copay PCP Visits | EPO · Silver | Preferred | Accepting new patients |
| Medica Insure Silver $0 Copay PCP Visits | EPO · Silver | Preferredtier | Accepting new patients |
| Medica Insure Silver $0 Copay PCP Visits | EPO · Silver | Standardtier | Accepting new patients |
| Medica Insure Silver Share | EPO · Silver | Preferred | Accepting new patients |
| Medica Insure Silver Share | EPO · Silver | Preferredtier | Accepting new patients |
| Medica Insure Silver Share | EPO · Silver | Standardtier | Accepting new patients |
| Medica Insure Silver Standard | EPO · Silver | Preferred | Accepting new patients |
| Medica Insure Silver Standard | EPO · Silver | Preferredtier | Accepting new patients |
| Medica Insure Silver Standard | EPO · Silver | Standardtier | Accepting new patients |
Oscar Insurance Company
Network data as of Sep 15, 2026, as reported by the insurer.
Show all 16 plans from Oscar Insurance Company
| Plan | Plan type | Network tier | New patients |
|---|---|---|---|
| Bronze Classic 4700 | MercyOne | EPO · Expanded Bronze | Preferred | Accepting new patients |
| Bronze Classic Standard | MercyOne | EPO · Expanded Bronze | Preferred | Accepting new patients |
| Bronze Elite + PCP Saver Plus | MercyOne | EPO · Expanded Bronze | Preferred | Accepting new patients |
| Bronze Simple Breathe Easy with Enhanced COPD Benefits | MercyOne | EPO · Expanded Bronze | Preferred | Accepting new patients |
| Bronze Simple Chronic Care CKM | MercyOne | EPO · Expanded Bronze | Preferred | Accepting new patients |
| Bronze Simple Diabetes | MercyOne | EPO · Expanded Bronze | Preferred | Accepting new patients |
| Gold Classic Standard | MercyOne | EPO · Gold | Preferred | Accepting new patients |
| Gold Elite | MercyOne | EPO · Gold | Preferred | Accepting new patients |
| Secure | MercyOne | EPO · Catastrophic | Preferred | Accepting new patients |
| Silver Classic Standard | MercyOne | EPO · Silver | Preferred | Accepting new patients |
| Silver Classic | MercyOne | EPO · Silver | Preferred | Accepting new patients |
| Silver Simple Breathe Easy with Enhanced COPD Benefits | MercyOne | EPO · Silver | Preferred | Accepting new patients |
| Silver Simple Chronic Care CKM | MercyOne | EPO · Silver | Preferred | Accepting new patients |
| Silver Simple Diabetes | MercyOne | EPO · Silver | Preferred | Accepting new patients |
| Silver Simple PCP Saver | MercyOne | EPO · Silver | Preferred | Accepting new patients |
| Silver Simple Women's Health with Menopause Benefits | MercyOne | EPO · Silver | Preferred | Accepting new patients |
Wellmark Health Plan of Iowa, Inc.
Network data as of Sep 8, 2026, as reported by the insurer.
Show all 7 plans from Wellmark Health Plan of Iowa, Inc.
| Plan | Plan type | Network tier | New patients |
|---|---|---|---|
| Wellmark Bronze HDHP HMO HSA Qualified | HMO · Expanded Bronze | Wellmark Blue HMO Network | Accepting new patients at some locations |
| Wellmark Bronze Traditional HMO | HMO · Expanded Bronze | Wellmark Blue HMO Network | Accepting new patients at some locations |
| Wellmark Gold Traditional HMO | HMO · Gold | Wellmark Blue HMO Network | Accepting new patients at some locations |
| Wellmark Silver Traditional HMO | HMO · Silver | Wellmark Blue HMO Network | Accepting new patients at some locations |
| Wellmark Standard Bronze HMO | HMO · Expanded Bronze | Wellmark Blue HMO Network | Accepting new patients at some locations |
| Wellmark Standard Gold HMO | HMO · Gold | Wellmark Blue HMO Network | Accepting new patients at some locations |
| Wellmark Standard Silver HMO | HMO · Silver | Wellmark Blue HMO Network | Accepting new patients at some locations |
This covers ACA Marketplace plans only, as reported by each insurer. It does not include employer, Medicare Advantage, or state-run exchange plans, and a plan missing from this list does not mean Dr. William I. Parker is out of network. Insurer directories can be out of date, so always confirm with the insurer and the office before your visit.
Medicare Enrollment
Dr. William I. Parker is enrolled to bill Medicare as a Practitioner - Emergency Medicine (also registered under: Practitioner - Family Practice) .
Bills through: North Iowa Mercy Clinics
Based on Medicare's public enrollment records as of Jul 17, 2026. This reflects Medicare fee-for-service enrollment only and says nothing about other insurance, quality, outcomes, or board certification.
Looking for more Emergency Physicians?
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Questions & Answers
Where can you meet with Dr. William I. Parker?
Dr. William I. Parker's office is located at 1000 4th Street Southwest Suite Er in Mason City, IA 50401.
Does Dr. William I. Parker accept patients with Medica?
Yes, Dr. William I. Parker is listed in-network for Medica through the ACA Marketplace (Obamacare/HealthCare.gov). See the Marketplace plans section for details.
What conditions does Dr. William I. Parker treat?
Dr. William I. Parker provides treatment for Choking, Febrile Seizure, Insect Stings, Phlebitis and Thrombophlebitis, Prescription Refill, Whiplash. For the full list see this list.