IVIG is used across several neurological and neuromuscular disorders, but it is not a general treatment for weakness, numbness, neuropathy, or fatigue.
Before a neurologist refers a patient for intravenous immunoglobulin, several questions usually need to be answered:
- What is the diagnosis?
- Is IVIG supported for that condition?
- How severe are the symptoms?
- Is the disease active?
- Has the patient tried other treatments?
- Is rapid improvement needed?
- Are there medical reasons another therapy may not be appropriate?
- Can treatment safely occur outside the hospital?
The referral generally comes after the neurologist has determined that the patient’s condition and clinical situation support immunoglobulin therapy.
IVIG stands for intravenous immunoglobulin.
It is a concentrated preparation of immunoglobulin G antibodies derived from screened donor plasma.
IVIG can affect immune activity in several ways.
In neurology, it may be used to treat selected autoimmune or immune-mediated conditions in which abnormal immune activity affects:
- Peripheral nerves
- Neuromuscular transmission
- Muscles
- Other parts of the nervous system
Patients can learn more in Mercy Infusion’s guide to What Is IVIG Therapy?
Which Neurological Conditions May Be Treated With IVIG?
IVIG has different levels of evidence depending on the diagnosis.
A 2023 consensus statement from the American Association of Neuromuscular & Electrodiagnostic Medicine found strong evidence supporting IVIG for conditions including:
- Chronic inflammatory demyelinating polyneuropathy
- Multifocal motor neuropathy
- Guillain-Barré syndrome in adults
- Myasthenia gravis exacerbations
- Dermatomyositis
- Stiff-person syndrome
It specifically noted that evidence does not support IVIG for every type of neuropathy or every neuromuscular condition.
That distinction is important.
A neurologist does not refer simply because a patient has “neuropathy.”
The underlying diagnosis matters.
CIDP
Chronic inflammatory demyelinating polyneuropathy, or CIDP, is one of the neurological disorders most commonly associated with IVIG therapy.
CIDP can cause:
- Progressive weakness
- Numbness
- Tingling
- Reduced reflexes
- Balance problems
- Difficulty walking
- Loss of hand function
The EAN/PNS CIDP guideline strongly recommends IVIG or corticosteroids as initial treatment for typical CIDP and CIDP variants and recommends IVIG as an important maintenance option when effective.
Before referral, the neurologist may review:
- Clinical pattern
- Duration of symptoms
- Neurological examination
- Nerve conduction studies
- EMG findings
- Other possible causes of neuropathy
Learn more about CIDP Treatment at Mercy Infusion.
Multifocal Motor Neuropathy
Multifocal motor neuropathy, or MMN, primarily affects motor nerves.
Patients may experience:
- Asymmetric hand weakness
- Reduced grip strength
- Wrist drop
- Foot drop
- Muscle twitching
- Progressive motor weakness
Sensory symptoms such as numbness are generally much less prominent than in CIDP.
IVIG is considered a primary treatment for MMN.
Guidelines recommend IVIG as first-line therapy when weakness causes sufficient disability, with repeated treatment considered when the patient responds.
A neurologist may refer after evaluating:
- Weakness pattern
- Nerve conduction studies
- Evidence of motor conduction block
- EMG findings
- Anti-GM1 antibodies when appropriate
- Alternative diagnoses
Myasthenia Gravis
Myasthenia gravis affects communication between nerves and muscles.
IVIG may be considered when:
- MG symptoms significantly worsen
- Rapid improvement is needed
- Severe swallowing weakness is present
- A patient is preparing for certain procedures
- Other therapies are insufficient
- Maintenance treatment is appropriate in selected cases
Evidence is strongest for MG exacerbations and selected refractory or maintenance situations rather than routine IVIG use in every patient with stable MG.
Learn more about Mercy Infusion’s Myasthenia Gravis Treatment services.
Guillain-Barré Syndrome
Guillain-Barré syndrome, or GBS, is an acute immune-mediated neurological disorder that may progress rapidly.
Patients can develop:
- Weakness
- Difficulty walking
- Reduced reflexes
- Sensory symptoms
- Autonomic abnormalities
- Respiratory weakness
Current international guidance recommends IVIG for appropriately selected patients with significant GBS, particularly those unable to walk independently within the relevant early treatment window.
GBS is different from many outpatient infusion conditions because it may require urgent hospitalization and respiratory monitoring.
A patient with rapidly progressive weakness or respiratory symptoms should not simply wait for an outpatient infusion referral.
What Does a Neurologist Look for Before Referring?
The process varies by diagnosis, but a neurologist may assess several broad areas.
- A Defined Diagnosis
The neurologist needs to determine what disease process is causing the symptoms.
“Muscle weakness” alone is not a diagnosis.
“Numbness and tingling” alone are not a diagnosis.
IVIG is prescribed for specific immune-mediated conditions, not for symptoms in isolation.
- Objective Clinical Findings
Depending on the condition, findings may include:
- Measured weakness
- Reduced reflexes
- Sensory deficits
- Cranial nerve weakness
- Difficulty swallowing
- Walking impairment
- Functional decline
- Characteristic neurological examination findings
- Diagnostic Testing
A referral may be supported by:
- Nerve conduction studies
- Electromyography
- Blood testing
- Antibody testing
- Cerebrospinal-fluid analysis
- Imaging
- Other disease-specific testing
Not every test is required for every diagnosis.
- Disease Severity
The neurologist considers whether symptoms are severe enough to justify treatment.
For example, mild symptoms may be managed differently from:
- Progressive weakness
- Repeated falls
- Loss of hand function
- Difficulty walking
- Significant swallowing problems
- Previous Treatments
Insurance plans and clinical guidelines may require documentation of:
- Previous medications
- Treatment failures
- Side effects
- Contraindications
- Clinical response
Does a Neurologist Have to Try Other Treatments First?
Not always.
It depends on the diagnosis.
For example:
- IVIG is an established first-line option for CIDP.
- IVIG is a primary treatment for MMN.
- IVIG is commonly used for significant GBS.
- In MG, IVIG may be used when rapid immune modulation is required.
Other conditions may have different preferred first-line therapies.
Insurance requirements may also differ from clinical guidelines.
Why Is the Referral So Detailed?
Specialty infusion treatment requires more than a prescription that simply says:
“IVIG.”
The infusion provider may need:
- Diagnosis
- IVIG product or product parameters
- Dose
- Patient weight
- Frequency
- Number of treatment days
- Infusion-rate instructions
- Premedications
- Laboratory orders when applicable
- Relevant medical history
- Insurance information
- Clinical records supporting medical necessity
A detailed referral helps the specialty pharmacy, insurer, and nursing team coordinate treatment correctly.
Neurologists: Need Help Coordinating an IVIG Referral?
Mercy Infusion works directly with neurology practices to help move physician-prescribed IVIG therapy from referral to treatment.
Our team can assist with:
- Referral intake
- Benefits verification
- Prior authorization
- Medical-record coordination
- Medication access
- Nursing
- Home infusion
- Infusion-suite scheduling
- Reauthorization
- Patient financial-support review
Call Mercy Infusion at 833-594-0124 to discuss a neurological IVIG referral.
What Happens After the Neurologist Sends the Referral?
Once the referral reaches Mercy Infusion, the process may include:
- Reviewing the prescription.
- Reviewing supporting clinical documentation.
- Confirming insurance information.
- Verifying benefits.
- Determining prior authorization requirements.
- Coordinating missing records with the neurology office.
- Submitting or supporting authorization.
- Reviewing expected patient financial responsibility.
- Determining the appropriate site of care.
- Coordinating medication, nursing, and scheduling.
Mercy Infusion’s role is to help manage the administrative and clinical logistics between the physician’s decision and actual treatment.
Learn more about How the Intake Process Works.
What Records May Insurance Require?
For neurological IVIG, insurers may request records such as:
- Neurologist progress notes
- Diagnosis
- Symptom history
- Nerve conduction results
- EMG findings
- Antibody testing
- Functional assessments
- Previous treatment history
- Dose and frequency
- Medical-necessity documentation
Requirements vary by diagnosis and health plan.
What If the Insurance Company Disagrees With the Neurologist?
Prior authorization does not always result in immediate approval.
The insurer may:
- Ask for additional documentation
- Require another treatment first
- Prefer a particular IVIG product
- Require a specific infusion provider
- Require a different site of care
- Deny the initial request
The prescribing neurologist may then determine whether additional documentation, peer-to-peer review, reconsideration, or appeal is appropriate.
How Long Does Referral to Treatment Take?
There is no single timeframe.
A straightforward referral with complete documentation may move quickly.
Other cases may take longer because of:
- Missing records
- Prior authorization
- Appeals
- Preferred-product requirements
- Network restrictions
- Nursing availability
- Site-of-care requirements
One of the best ways to reduce avoidable delay is to submit a complete referral package from the beginning.
Can the Neurologist Refer for Home IVIG?
Yes, when clinically appropriate.
Some medically stable patients receiving ongoing IVIG can receive treatment at home.
Factors include:
- Diagnosis
- Clinical stability
- Previous IVIG tolerance
- Infusion history
- Medical risk
- Venous access
- Home environment
- Nursing availability
- Insurance requirements
Mercy Infusion works with the neurologist to determine whether Home Infusion is appropriate.
When Is an Infusion Suite More Appropriate?
An outpatient Infusion Suite may be preferable when:
- Closer observation is needed
- Treatment is new
- The patient has experienced infusion reactions
- The home environment is not suitable
- Nursing or insurance requirements favor facility-based treatment
- The patient prefers treatment outside the home
When Should a Patient Be Treated in the Hospital Instead?
Certain neurological situations require hospital-level care.
Examples may include:
- Significant respiratory weakness
- Suspected myasthenic crisis
- Rapidly progressive GBS
- Severe swallowing impairment
- Unstable vital signs
- Other acute complications
Home infusion and ambulatory infusion suites are designed for medically appropriate outpatient treatment.
They are not substitutes for emergency or inpatient care.
Does the Patient Need a Neurologist to Receive IVIG?
The prescribing clinician depends on the diagnosis and therapy.
For many neurological indications, a neurologist or neuromuscular specialist establishes the diagnosis and treatment plan.
Other specialties may prescribe IVIG for non-neurological conditions.
Mercy Infusion works with qualified prescribing providers across several specialties.
What Makes a Strong IVIG Referral?
From an operational standpoint, the best referral is complete.
A strong referral usually includes:
- Clear diagnosis
- Treatment order
- Dose
- Frequency
- Current patient weight
- Clinical documentation
- Relevant diagnostic testing
- Previous treatment history
- Insurance information
- Prescriber contact information
Incomplete referrals often create unnecessary phone calls and delays.
Why Referral Coordination Matters
Neurology practices already manage complex patients.
They should not have to spend unnecessary time chasing:
- Specialty pharmacy networks
- Insurer forms
- Authorization status
- Nursing availability
- Medication delivery
- Site-of-care questions
A specialty infusion provider can take much of that administrative burden out of the practice.
Mercy Infusion’s Neurology Infusion Therapy program is designed to support that coordination.
For Patients: What Should You Ask Your Neurologist?
If IVIG is being discussed, useful questions include:
- What diagnosis are we treating?
- Why are you recommending IVIG?
- Is this short-term or recurring therapy?
- How will we know whether it is working?
- How often will treatment be given?
- What side effects should I watch for?
- Can I receive treatment at home?
- What other treatment options exist?
- How will insurance approval work?
Does IVIG Work for Every Neuropathy?
No.
This is an important point.
IVIG is not an evidence-based treatment for every form of peripheral neuropathy.
The AANEM consensus statement specifically found strong support for conditions such as CIDP and MMN but not for several other neuropathies, including certain idiopathic small-fiber neuropathies.
That is why accurate neurological diagnosis is critical before referral.
Ready to Refer a Patient?
Mercy Infusion supports physician-directed neurological infusion therapy and works with neurology practices throughout the treatment-access process.
Our team can help coordinate:
- IVIG referrals
- Benefits investigation
- Prior authorization
- Payer communication
- Home infusion when appropriate
- Ambulatory infusion-suite care
- Nursing
- Ongoing reauthorization
- Patient financial-support resources
Neurology offices and patients can call Mercy Infusion at 833-594-0124 to discuss a referral or the next steps after IVIG has been prescribed.
Frequently Asked Questions
Which neurological conditions are commonly treated with IVIG?
IVIG has established roles in conditions including CIDP, MMN, adult Guillain-Barré syndrome, and MG exacerbations, among others.
Does neuropathy automatically qualify for IVIG?
No. Many different diseases cause neuropathy, and IVIG is appropriate only for selected immune-mediated conditions.
What does a neurologist usually send with an IVIG referral?
A referral may include the diagnosis, prescription, dose, frequency, clinical notes, diagnostic testing, patient weight, treatment history, and insurance information.
Can a neurologist refer a patient directly for home infusion?
Yes, when home treatment is clinically appropriate and permitted by the patient’s insurance plan.
Does insurance require proof of the diagnosis?
Often. Prior authorization may require clinical documentation and testing supporting the condition being treated.
Can Mercy Infusion work directly with the neurology office?
Yes. Mercy Infusion coordinates with prescribing providers, insurers, nurses, and patients throughout the referral and treatment process.
About the Author
April Cable, Senior Director of Operations
April Cable has more than 35 years of experience in specialty pharmacy billing, reimbursement, operations, and patient access. At Mercy Infusion, she helps patients and referring offices navigate insurance requirements, prior authorization, medication access, financial-support programs, and ongoing infusion coordination.
Medical Disclaimer: This article is for general educational purposes only. IVIG is not appropriate for every neurological condition or every patient. Diagnosis, treatment eligibility, dose, frequency, and site of care must be determined by a qualified prescribing clinician.
