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- NPI Number
- 1326014382
- Provider Type
- Individual Practitioner
- Credential
- MD
- Primary Specialty
- Internal Medicine - Hematology & Oncology
- License Number
- 48107
- Practice Address
- 975 Port Washington RD
- City, State ZIP
- Grafton, WI 53024
- Phone
- (262) 857-5750
- Last Updated
- June 8, 2026
- Source
- Publicly available data
John Maul, MD is a internal medicine - hematology & oncology provider located in Grafton, WI. They offer internal medicine - hematology & oncology services to patients in the Grafton area.
As a internal medicine - hematology & oncology provider in Grafton, this clinician evaluates and treats patients for a range of common conditions seen in Grafton and throughout WI.
The practice is located at 975 Port Washington RD, Grafton, WI 53024. Patients can call 2628575750 to schedule an appointment or use the directions link above to find the office from anywhere in the area.
Patients typically visit this provider for patients see internists for annual physicals, management of chronic conditions such as diabetes, hypertension, and heart disease, second opinions, and coordination of care between specialists.
If you plan to see this provider, it is a good idea to confirm that the practice accepts your insurance and is in-network before scheduling. Coverage details vary by plan, and our quote tool can help you compare options in WI.
This profile was last verified on June 8, 2026. Provider information is sourced from publicly available data and may not reflect recent changes. Please confirm details directly with the practice before scheduling.
Call for hours and appointments. Hours may vary by provider and location.
A patient’s guide to internal medicine - hematology & oncology care in Grafton, WI.
What a Internal Medicine - Hematology & Oncology provider does
Internal medicine providers, also called internists, specialize in the prevention, diagnosis, and treatment of diseases in adults. They are trained to handle both common and complex illnesses and often manage patients with multiple chronic conditions.
Common conditions treated
Internists commonly treat hypertension, type 2 diabetes, coronary artery disease, chronic obstructive pulmonary disease (COPD), thyroid disorders, kidney disease, and arthritis. They also coordinate cancer screenings and geriatric assessments.
Common reasons to schedule a visit
Patients see internists for annual physicals, management of chronic conditions such as diabetes, hypertension, and heart disease, second opinions, and coordination of care between specialists.
What to expect during a visit
Expect a thorough review of your medical history, current medications, and lifestyle. Your internist may order blood work, imaging, or other diagnostic tests to support an accurate diagnosis and treatment plan.
Insurance coverage considerations
Medicare and most commercial insurance plans cover adult preventive visits and chronic care management. Verify network status before scheduling by using our quote tool.
How to choose the right internal medicine - hematology & oncology provider in Grafton
Choose an internist with experience managing your specific conditions, convenient hospital affiliations, and a willingness to coordinate with any specialists you may need. Board certification in internal medicine signals additional training and commitment to ongoing education.
Looking for in-network coverage that includes this internal medicine - hematology & oncology provider? Compare health plans in WI →
Insurance acceptance not listed
The public NPI registry does not include insurance acceptance data. Contact the office directly to ask if they accept your insurance plan. You can also use our quote tool to find health plans in WI.
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Common questions about John Maul, MD in Grafton, WI.
How do I make an appointment with John Maul, MD?
Call John Maul, MD directly at their Grafton office to schedule a visit. You can also use the contact form on this page to send a message and the practice will respond.
Does John Maul, MD accept insurance?
Provider insurance information is not included in the public NPI registry data that powers this directory. Contact the office directly to ask whether they accept your specific insurance plan. You can also use our quote tool to find health plans in WI.
What are the office hours for John Maul, MD in Grafton?
Office hours for John Maul, MD in Grafton are not currently published. Call the practice directly to confirm hours before your visit.
Is parking available at John Maul, MD's Grafton location?
Most provider offices in Grafton offer on-site or nearby street parking. Call John Maul, MD in Grafton ahead of time to confirm parking options and accessibility accommodations.
Does John Maul, MD offer telehealth?
Many internal medicine - hematology & oncology providers in WI now offer telehealth visits for follow-ups, medication management, and routine consultations. Call John Maul, MD to ask whether a telehealth visit is appropriate for your needs.
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Claim ProfileData is sourced from publicly available records. Public records do not confirm active license status, quality of care, insurance acceptance, or network participation. Please verify details directly with the provider before scheduling. Last updated June 8, 2026.