Understand Medical Groups Before Choosing a Doctor or Health Plan
A medical group is more than a list of doctors. It can determine which primary care office you use, how referrals are processed, which specialists can see you, where tests are performed, which portal stores your information and who sends each bill.
This guide explains how medical groups work, how they differ from hospitals and insurance companies, how to compare them and what to check before an appointment, specialist referral, test, procedure or payment.
Multiple clinicians working through one organized practice.
Primary care, one specialty or multiple specialties.
The group may be part of some networks but not others.
Referrals, tests, records and follow-up may be shared.
Federal patient guidance checked August 2026.
Which organization handles the patient task?
Contact the medical group for primary care, specialist offices, routine refills, referral status, test orders, portal messages and office records.
Contact the insurance company for network verification, deductibles, copays, prior authorization, claim denials and appeals.
Contact the hospital for admissions, emergency records, facility bills, hospital procedures and hospital-based imaging or laboratory care.
What is a medical group?
A medical group is an organized practice where doctors and other licensed clinicians work through a shared business or clinical structure rather than operating completely alone.
Medicare describes group practices as arrangements that allow doctors and clinicians to work together. Some groups combine different specialties so patients can receive several types of care within one organization.
Clinicians may use the same electronic health record, patient portal, referral department and care-management staff.
Scheduling, billing, insurance verification, records and complaints may be managed centrally.
A group may coordinate primary care, specialists, laboratory work, imaging, urgent care and hospital follow-up.
Medical group vs hospital, health system, insurer and provider network
| Organization | Main role | Typical patient tasks | Common misunderstanding |
|---|---|---|---|
| Medical group | Employs, contracts with or organizes doctors and clinicians. | Appointments, referrals, refills, office records, portal messages and professional bills. | The group is not automatically the hospital or insurance company. |
| Hospital | Operates emergency, inpatient, surgical and facility-based services. | Admissions, emergency treatment, hospital records and facility bills. | An affiliated doctor may send a separate professional bill. |
| Health system | May own or connect hospitals, clinics, medical groups and other services. | System-wide care, facilities and branded portals. | Not every doctor using a hospital belongs to the same group. |
| Insurance company | Administers benefits, networks, claims and patient cost-sharing. | Coverage verification, authorization, claim review and appeals. | The insurer does not provide the actual medical treatment. |
| Provider network | Defines which doctors, groups and facilities participate in a health plan. | Choosing in-network providers and controlling costs. | One carrier may offer several networks with different participating groups. |
| Accountable Care Organization | Coordinates doctors, hospitals and professionals around quality, outcomes and cost. | Coordinated care and fewer disconnected services. | An ACO is not an insurance policy. |
Common types of medical groups
Focuses on family medicine, internal medicine, pediatrics, geriatrics or a combination of primary-care services.
Multiple clinicians practice in one field, such as cardiology, orthopedics, dermatology, gastroenterology or oncology.
Primary care and several specialties operate through one larger organization or shared clinical system.
Doctors work through a group connected with a hospital or health system, although physician and hospital bills may remain separate.
The practice is not owned by the hospital where its doctors may admit or treat patients.
Patients pay a recurring membership fee for defined access or services. Membership is not a substitute for health insurance.
How an Accountable Care Organization differs from a medical group
CMS defines an Accountable Care Organization as a group of doctors, hospitals and other healthcare professionals that work together to provide coordinated care, improve outcomes and manage costs.
- Is a practice organization.
- May employ or organize clinicians.
- Can participate in several health-plan networks.
- May or may not participate in an ACO.
- Connects multiple providers around coordinated care.
- May include medical groups, hospitals and other organizations.
- Measures care quality, outcomes and spending.
- Is not itself an insurance plan.
How to compare medical groups before choosing one
Questions that reveal how the group really works
| Question | Why it matters | Good evidence to request |
|---|---|---|
| Are new patients being accepted? | A group may appear in a directory while individual panels are closed. | Provider name, location and earliest available appointment. |
| How are urgent problems handled? | You may need same-day, evening or weekend care. | Published after-hours number and urgent-care instructions. |
| How long do referrals take? | A specialist visit can be delayed or denied without authorization. | Typical processing period and referral tracking method. |
| Which hospitals are used? | Hospital preference affects travel, specialists and network costs. | Doctor profile and current hospital affiliations. |
| Who answers portal messages? | Messages may be reviewed by staff before the doctor sees them. | Expected response time and billing policy. |
| What happens when my PCP is unavailable? | Larger groups may offer team-based coverage. | Cross-coverage and same-day scheduling policy. |
How to check doctors inside a medical group
How insurance networks affect medical groups
| Plan type | Medical-group effect | Referral rule | Out-of-network care |
|---|---|---|---|
| HMO | Coverage is generally limited to doctors and organizations working for or contracting with the HMO. | Specialist referrals are commonly required. | Generally not covered except emergencies or approved exceptions. |
| POS | Patients pay less within the participating network. | A primary care referral is generally required for specialists. | May be available at greater patient cost. |
| PPO | Patients usually have broader provider choice. | A referral is generally not required, though authorization may be. | Often covered at a higher cost to the patient. |
Seven-part network verification
How to join or establish care with a medical group
Appointment types that should not be confused
| Visit | Main purpose | Before scheduling |
|---|---|---|
| New-patient visit | Establish care and review medical history and current concerns. | Ask which records and forms are required. |
| Preventive or annual visit | Prevention, screening and health-risk review. | Ask which services are covered as preventive under your plan. |
| Medicare Annual Wellness Visit | Create or update a personalized prevention plan and health-risk assessment. | It is not the same as a routine physical examination. |
| Problem or sick visit | Evaluate symptoms, injury or a medical concern. | Copay, deductible or coinsurance may apply. |
| Chronic-care follow-up | Monitor conditions, medicines and laboratory results. | Complete requested tests before the appointment. |
| Hospital follow-up | Review discharge care, medicines, recovery and specialist plans. | Bring the discharge summary and changed medication list. |
| Preoperative clearance | Evaluate medical readiness for a planned procedure. | Bring the surgeon’s form, procedure details and required testing list. |
| Portal or e-visit | Clinical assessment performed through secure electronic communication. | Ask whether the interaction may be billed. |
What to bring to a medical group appointment
What a medical group portal can—and cannot—do
Request eligible visits, review appointment details and complete electronic check-in.
Review released laboratory, imaging and other diagnostic information.
Request routine medicine renewals and confirm the pharmacy.
Send non-urgent questions to staff or the clinical team.
Review qualifying statements and submit secure payments.
Download or share information already available in the portal.
Questions to ask about portal-message charges
How referrals and prior authorizations work
Why medical-group testing can create separate bills
A medical group may collect a specimen or order a test, while an outside laboratory, imaging center, radiologist or hospital performs or interprets the service.
| Component | Possible provider | What to verify |
|---|---|---|
| Doctor’s evaluation | Medical group | Office copay, deductible and professional network. |
| Specimen collection | Medical office or laboratory | Whether collection and processing are billed separately. |
| Laboratory processing | Outside or affiliated laboratory | The health plan’s preferred laboratory. |
| Imaging equipment | Hospital, medical group or imaging center | Facility network, authorization and accreditation when applicable. |
| Image interpretation | Radiologist or physician group | Whether the interpreting professional is in network. |
| Pathology | Pathology group or laboratory | Professional and laboratory billing arrangements. |
Medical group, urgent care or emergency room?
Use primary care for preventive care, chronic conditions, refills, referrals and non-urgent follow-up.
Urgent care may handle minor illness, simple injuries, rashes, urinary symptoms and other conditions that cannot wait.
Call 911 for chest pain, severe breathing trouble, stroke signs, uncontrolled bleeding, seizures or loss of consciousness.
How medical group billing works
Check every medical bill for these items
Good Faith Estimates for self-pay care
Patients who do not have insurance or choose not to use insurance can generally request a written Good Faith Estimate. When care is scheduled at least three business days ahead, federal rules establish timing requirements for providing the estimate.
| Scheduling situation | Estimate timing | Patient action |
|---|---|---|
| Care scheduled 3-9 business days ahead | Estimate generally due within 1 business day. | Save the written itemized estimate. |
| Care scheduled at least 10 business days ahead | Estimate generally due within 3 business days. | Request estimates from each separately billing provider or facility. |
| Estimate requested before scheduling | Estimate generally due within 3 business days. | Use it to compare facilities and providers. |
| Final bill is $400 or more above the estimate | The federal patient-provider dispute process may be available. | Save the estimate, bill and supporting communications. |
How to request records from a medical group
A covered organization generally must act on an access request within 30 calendar days. One additional 30-day extension may be used if written notice is provided within the initial period.
Fees generally must be reasonable and cost-based. Searching for or retrieving records is not one of the copying costs permitted under the federal HIPAA access rule.
What to do when a medical group problem is not resolved
| Problem | Start here | Possible next step |
|---|---|---|
| Appointment, communication or staff issue | Office manager or patient-relations department | Medical-group administration or health-plan grievance. |
| Referral or authorization delay | Referral department and health-plan member services | Formal grievance, expedited review or appeal when appropriate. |
| Insurance claim denial | Request the written denial reason | Internal appeal and eligible independent external review. |
| Unexpected out-of-network bill | Provider billing department and insurer | Federal or state surprise-billing complaint. |
| Medical-record access or privacy concern | Privacy officer or health-information department | HHS Office for Civil Rights complaint. |
| Physician professional conduct | Medical-group patient relations when safe and appropriate | State medical board complaint. |
| Immediate patient safety concern | Clinical supervisor, emergency service or facility leadership | Regulatory or licensing complaint with documented facts. |
Create a useful complaint record
Practical medical group tips that prevent common problems
Save the individual doctor’s name and the medical group’s legal or billing name.
A doctor may participate at one location but not another.
Confirm participation with the insurer and medical group.
Save the authorization, approved visits and expiration date.
The office, laboratory and interpreting doctor may bill separately.
Missing results may be stored in another organization’s portal.
Clinical review, insurance authorization and weekends can delay approval.
Multiple organizations may send statements for one episode of care.
Keep medication lists, recent notes, test results and immunization history.
Medical groups frequently asked questions
What is a medical group?
A medical group is an organized practice where multiple doctors and clinicians provide care through a shared clinical or administrative structure.
Is a medical group the same as a hospital?
No. The medical group generally represents professional providers, while the hospital operates emergency, inpatient, surgical and other facility services.
Is a medical group an insurance company?
No. Medical groups provide care. Insurance companies administer benefits, networks, claims and patient cost-sharing.
How do I verify that a medical group accepts my insurance?
Confirm the doctor, group, exact office and planned service with the insurer and medical group. Use the full product and network name printed on the card.
Do I need a referral inside the same group?
The insurance plan controls the referral rule. HMOs and POS plans commonly require referrals, while PPOs generally offer more direct specialist access.
How should I compare medical groups?
Compare doctors, insurance participation, appointment availability, specialist access, urgent care, hospitals, tests, portal functions, language access and billing support.
What is an ACO?
An Accountable Care Organization connects doctors, hospitals and other professionals to coordinate care, improve quality and manage costs. It is not an insurance policy.
Can portal messages be billed?
They may be billed when the clinician must evaluate a new problem, review records or provide treatment advice. Ask about the policy before sending a complex request.
How long can a medical-record request take?
A covered organization generally must act within 30 calendar days. One additional 30-day extension may be allowed with timely written notice.
Where do I complain about a medical group?
Start with the office manager or patient-relations department. Use the insurer for coverage appeals, HHS for HIPAA complaints and the state medical board for physician-conduct concerns.
Official tools for comparing medical groups and protecting your rights
The main processes are explained above. Use these official resources when you are ready to search providers, understand network rules, request records, review bills or file an appeal.