Can You Get SSDI for Mast Cell Activation Syndrome?
TL;DR: Yes, but MCAS claims are challenging because the condition is relatively new in medical literature and many SSA examiners are unfamiliar with it. Mast Cell Activation Syndrome causes unpredictable allergic-type reactions including anaphylaxis, flushing, hives, GI problems, and cardiovascular instability. The SSA evaluates MCAS under immune system listings (14.10 for immune deficiency) or under whatever body system is most affected. The unpredictable nature of flares, combined with the risk of anaphylaxis, can make any workplace unsafe.
MCAS occurs when mast cells in your body release chemical mediators (histamine, tryptase, prostaglandins) inappropriately, causing allergy-like reactions without a specific allergen trigger. Reactions can range from mild flushing and itching to life-threatening anaphylaxis. Triggers can include temperature changes, stress, exercise, certain foods, medications, and chemical exposures, making the condition nearly impossible to fully control.
SSA Listings for MCAS
| SSA Listing | When It Applies |
|---|---|
| 14.10 (Immune deficiency) | Recurrent infections or immune dysfunction requiring treatment |
| 4.00 (Cardiovascular) | If MCAS causes significant blood pressure instability |
| 5.06 (Inflammatory bowel disease) | If GI manifestations are predominant |
| 8.05 (Dermatitis) | If skin involvement is extensive |
| 3.03 (Asthma) | If respiratory symptoms are predominant |
SSA evaluates disability claims using the Blue Book, which lists qualifying conditions and the specific criteria each must meet. If your condition matches a Blue Book listing, approval is more straightforward. Even if your condition does not match a Blue Book listing exactly, you can still qualify through a medical-vocational allowance. This considers your age, education, work experience, and functional limitations together. Consistent treatment records are critical. SSA looks for ongoing documentation showing your condition limits your ability to work, not just a single diagnosis.
Medical Evidence the SSA Needs
- Allergist or immunologist diagnosis following established MCAS criteria
- Elevated tryptase levels during episodes (or documented baseline and episode comparison)
- 24-hour urine for prostaglandin D2 and histamine metabolites
- Documentation of anaphylaxis episodes and EpiPen use
- Bone marrow biopsy results if performed (to rule out mastocytosis)
- Medication regimen: H1/H2 blockers, mast cell stabilizers, epinephrine
- Emergency room visits for reactions
- Trigger diary documenting unpredictable reactions
Request your medical records directly from each provider rather than relying on SSA to gather them. SSA requests can take months, and records sometimes get lost in the process. Include records from every provider you have seen for your disabling conditions, even if a visit seemed minor. Gaps in treatment history are one of the most common reasons for denial. Medical records from the past 12 months carry the most weight, but older records help establish the onset date. A treatment history spanning several years shows the condition is persistent, not temporary.
Common Denial Reasons
- MCAS not well understood by SSA. Provide educational materials from your specialist along with your records.
- Normal labs between episodes. MCAS mediators are only elevated during reactions. Make sure labs are drawn during or immediately after episodes.
- Medications expected to control symptoms. Document breakthrough reactions despite maximum medical therapy.
- No specific SSA listing. Without a direct listing, you need to show your symptoms meet criteria under multiple body system listings.
A denial does not mean your case is over. About 2 out of 3 initial SSDI applications are denied, and many of those denials are overturned on appeal. Read your denial letter carefully. It tells you exactly why SSA denied your claim. The most common reasons are insufficient medical evidence and SSA determining you can still perform some type of work. You have 60 days from the date on your denial letter to file an appeal. Missing this deadline means starting over from scratch, so mark it on your calendar immediately.
Compassionate Allowance
MCAS is not on the Compassionate Allowance list. Systemic mastocytosis (a related but different condition) with aggressive features may qualify.
SSA evaluates disability claims using the Blue Book, which lists qualifying conditions and the specific criteria each must meet. If your condition matches a Blue Book listing, approval is more straightforward. Even if your condition does not match a Blue Book listing exactly, you can still qualify through a medical-vocational allowance. This considers your age, education, work experience, and functional limitations together. Consistent treatment records are critical. SSA looks for ongoing documentation showing your condition limits your ability to work, not just a single diagnosis.
Function Report Tips
- Describe the unpredictability of reactions and how it makes leaving home risky
- List all known triggers and how ubiquitous they are in work environments
- Detail the severity range of your reactions, from mild to anaphylaxis
- Explain the need to carry emergency medications at all times
- Describe dietary restrictions and how they limit energy and function
- Note how medication side effects (drowsiness from antihistamines) affect function
MCAS claims need specialist-level documentation. ClaimPath creates SSA-compliant disability documents for $79, saving the 25% attorney fee.
Related Condition Guides
- SSDI for Ehlers-Danlos Syndrome
- SSDI for POTS
- SSDI for Multiple Chemical Sensitivity
- SSDI for Severe Asthma
Report any changes within 10 days of the change occurring. This includes starting or stopping work, changes in your medical condition, moving to a new address, or receiving other benefits. You can report changes online through your my Social Security account, by calling SSA at 1-800-772-1213, or by visiting your local SSA office. Keep a record of what you reported and when. Failing to report changes can result in overpayments. SSA will recover overpayments by withholding future benefits, and in some cases, overpayments can reach thousands of dollars.
What to Do Next
- Check the date on your denial letter and mark your 60-day appeal deadline on a calendar. Missing this window means restarting the entire process.
- Request a complete copy of your SSA file (called the 'exhibit file') so you can see exactly what evidence the reviewer had, and identify any gaps you need to fill.
- Get an updated RFC form from your treating doctor that addresses the specific reasons listed in your denial. If SSA said you can do sedentary work, your doctor needs to explain why you cannot.
- Contact a disability attorney for a free case evaluation. Most work on contingency, so you pay nothing unless you win.
Try our free tools
Frequently Asked Questions
Can You Get SSDI for Mast Cell Activation Syndrome??
Yes, but MCAS claims are challenging because the condition is relatively new in medical literature and many SSA examiners are unfamiliar with it. Mast Cell Activation Syndrome causes unpredictable allergic-type reactions including anaphylaxis, flushing, hives, GI problems, and cardiovascular instability. The SSA evaluates MCAS under immune system listings (14.10 for immune deficiency) or under other relevant body system listings.
How does the Compassionate Allowance program work for MCAS?
MCAS is not on the Compassionate Allowance list. Systemic mastocytosis (a related but different condition) with aggressive features may qualify.
What should I include in a function report for SSDI due to MCAS?
Describe the unpredictability of reactions and how it makes leaving home risky. List all known triggers and how ubiquitous they are in work environments. Detail the severity range of your reactions, from mild to anaphylaxis. Explain the need to carry emergency medication.