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- 1000 4Th St Sw, Suite ER, Mason City, IA 50401
About Dr. Parker
William I. Parker, MD is a healthcare provider in Mason City, IA specializing in emergency medicine. Medicare claims data shows William provided 326 services to 315 patients. The services billed most often include emergency department visit with high level of medical decision making, emergency department visit with moderate level of medical decision making, and routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only. This provider record is associated with NPI 1356459903.
Factual summary compiled by Guide.md from public records; not written by this provider.
Education & Training
Specialty
Credentials & Licensing
Medicare information
Exactly as CMS reports it (National Downloadable File, Opt-Out Affidavits, Order & Referring). Not an insurance directory; confirm coverage with the office.
Contact Information
- (641) 422-7234
- Email not available
Practice Locations
1000 4TH ST SW SUITE ER
Mason City, IA 50401
Conditions Commonly Evaluated or Treated
Within Emergency Medicine generally. Availability varies by clinician, training and location — this profile has not been claimed, so nothing here is a personal claim by the provider.
Conditions
Bites & Stings
Brain & Nerves
- Delirium
- Stroke
- Fainting and syncope
- Seizure in Child
- Severe headache or sudden migraine
- Status epilepticus
- Transient ischemic attack
Endocrine & Metabolic
Eye Care
Injuries & Trauma
- Animal or dog bite
- Bone fractures
- Deep cut or wound
- Dislocated joint
- Severe burn
- Sprains and muscle strains
- Traumatic brain injury
Rashes & allergy
Skin & Infections
Urinary & Bladder
Women's Health
Abdomen & Digestion
Allergy & Immune
Allergy & Immunology
Blood & Circulation
Breathing
Digestion & Stomach
Ear, Nose & Throat
Environmental
Eye Emergency
General Emergency
Heart & Chest
Heart & Circulation
Heart & Lungs
Infections & Illness
Lungs & Breathing
Men's Health
Poisoning & Environmental
Poisoning & Toxins
Spine & Back
Urinary & Kidney
Procedures & services
Abdominal Procedures
Breathing & Airway
Critical Care
- Central line placement
- Chest tube insertion
- CPR and defibrillation
- Blood transfusion
Diagnostic testing
Diagnostics
Ear, Nose & Throat
Eye & ENT
Heart & Diagnostics
Imaging & Diagnostics
Injections & Vaccines
Kidney Care
Lung & Respiratory
Medications
Mental Health
Minor Procedures
- Nasal cautery for nosebleeds
- Tick Removal
- Urinary catheter insertion
- Fishhook or embedded splinter removal
- Incision and drainage of an abscess
Minor Trauma
Orthopedics
Poisoning & Toxicology
Specialized Care
Stroke & Vascular
Toxicology
Women's Health
Wound Care
- Burn dressing and care
- Skin glue for cuts
- Stitches and Laceration Repair
- Wound cleaning and debridement
- Wound stapling
Airway & Breathing
Anesthesia & Sedation
Digestive Care
Eye Care
Heart Care
Orthopedic Procedures
Supportive Care
Procedures Most Often Billed to Medicare
326 services · 315 patients · 4 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only | Treatment | 93010 |
14 | Less often than most peers in Emergency Medicine |
| Emergency department visit with high level of medical decision making | Office visit | 99285 |
216 | More often than most peers in Emergency Medicine |
| Emergency department visit with moderate level of medical decision making | Office visit | 99284 |
83 | More often than most peers in Emergency Medicine |
| Emergency department visit with low level of medical decision making | Office visit | 99283 |
13 | Less often than most peers in Emergency Medicine |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Other emergency physicians at this location 1
Same specialty, same street address — most likely the same department or group.
Related specialists at this location 1
Clinically related specialties at the same address — the people this provider most likely works alongside.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
More connections — 31 related providers in 4 groups
Other emergency physicians in Mason City 7
Same specialty, same city.
Trained at Other 8
Other providers in the same specialty who trained at the same institution.
Class of 1991 at Other 8
Providers who graduated from the same medical school in the same year.
Also performs Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only 8
Providers in IA who bill this service to Medicare most often.
Common questions
What is Dr. Parker's specialty?
Dr. Parker is an emergency physician in Mason City, IA. That is the designation recorded for this NPI in the federal registry, where it is listed as “Emergency Medicine”.
NPI registry
Where can I find Dr. Parker?
Dr. Parker is listed at 1000 4Th St Sw Suite ER, Mason City, IA 50401. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
How do I contact Dr. Parker?
The number on file is (641) 422-7234. Contact the office directly to confirm availability and scheduling.
NPI registry
What is the NPI for Dr. Parker?
Dr. Parker's National Provider Identifier is 1356459903. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
What is Dr. Parker's medical education?
Dr. Parker attended Other, graduating in 1991. This comes from the CMS National Downloadable File.
CMS public data
How much experience does Dr. Parker have?
Dr. Parker has 35 years experience. Calculated from a graduation year of 1991, reported in the CMS National Downloadable File.
CMS public data
What is Dr. Parker known for?
According to Medicare billing data, Dr. Parker provides treatments such as routine electrocardiogram using at least 12 leads with interpretation and report only, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Is Dr. Parker's profile verified?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. Parker. If this is you, claiming it is free.
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Guide.md listings do not constitute medical advice or an endorsement.