Apply for SSDI with the Social Security Administration online, by phone at 1-800-772-1213, or in person. You need enough recent work credits and a medical condition that prevents substantial work and is expected to last at least 12 months or result in death. Provide complete medical records and every provider's details. There is a five-month waiting period before benefits begin, and Medicare starts after 24 months of entitlement. If denied, appeal within 60 days.
How it works
The short version, before the detail.
SSDI is an insurance programme funded by Social Security taxes. If you have worked long enough and recently enough to earn the required credits, and you become disabled under Social Security's definition, you can receive a monthly benefit based on your past earnings. Certain family members may also receive benefits.
Social Security's definition of disability is strict. You must be unable to engage in substantial gainful activity because of a medically determinable physical or mental impairment expected to last at least 12 months or result in death. Social Security considers your condition, your ability to do past work, and - depending on age, education and experience - whether you could do other work.
The process runs through several stages: initial application, reconsideration, a hearing before an administrative law judge, Appeals Council review, and federal court. Many applicants who are denied at first are approved at the hearing stage. Representatives - lawyers or qualified advocates - can help and are usually paid only if you win, through a capped fee from back pay.
Benefits begin after a five-month waiting period from the established onset of disability, though people with ALS and some others are treated differently. Medicare coverage begins after 24 months of entitlement to SSDI. Back pay can be substantial given processing times.
If your SSDI is low and you have limited resources, you may also qualify for SSI, and for Medicaid during the Medicare waiting period. Work incentives, including a trial work period, let beneficiaries test returning to work without immediately losing benefits.
Work credits are earned from wages or self-employment on which you paid Social Security tax. Most adults need a set number of credits, with a portion earned recently - generally in the years just before the disability began - though younger workers need fewer. If you stopped working long before becoming disabled, your insured status may have lapsed; Social Security calls the last date you were insured your date last insured, and you must prove you were disabled before it.
Medical evidence decides most claims. Social Security looks for objective findings - imaging, test results, specialist notes - and records showing how your condition limits sitting, standing, lifting, concentrating and other work activities. Statements from treating doctors describing specific functional limits are especially valuable. Keeping regular appointments and following treatment builds the record.
If you are approved, family members may also receive benefits: a spouse caring for your child under 16 or disabled, children under 18 (or 19 in high school), and adult children disabled before 22. Benefits continue as long as you remain disabled, with periodic reviews. Work incentives, including the trial work period and the Ticket to Work programme, allow you to test returning to work.
Who usually qualifies
Factors the agency looks at. Only they make the final decision.
Compassionate Allowances speed decisions for certain severe conditions.
How to apply, step by step
Apply as soon as you stop working due to disability
Online, by phone or in person.
List every medical provider
Doctors, hospitals, clinics, medications, tests.
Provide work history
Jobs over the last 15 years.
Respond to requests and attend exams
Including consultative exams.
Appeal within 60 days if denied
Reconsideration, then hearing.
Consider a representative
Fees are capped and usually from back pay.
Apply for SSI or Medicaid if needed
During waiting periods.
What to have ready
Missing one item is rarely a reason to wait - start now.
- Social Security number and birth certificate
- Medical records and provider contacts
- List of medications
- Work history for 15 years
- W-2s or tax returns
- Workers' compensation information if any
What happens after you apply
How it compares
Similar programmes, and which one fits which need.
| Programme | What it covers | Best for |
|---|---|---|
| SSDI | Disability insurance from work history | Disabled workers who paid Social Security tax |
| SSI | Monthly payment for limited income and resources | Older, blind or disabled people |
| Short-term disability | Employer or state temporary benefits | Temporary conditions |
| Workers' compensation | Work-related injury benefits | Injuries on the job |
Real situations
How this plays out for people in common circumstances.
Construction worker with back injury
A long-time construction worker can no longer lift or stand for long.
He applies with full medical records; denied initially, approved at hearing with a representative.
Cancer diagnosis
A woman is diagnosed with an aggressive cancer.
Her condition may qualify for a Compassionate Allowance for faster decision.
Low SSDI amount
A part-time worker's SSDI is small.
She also qualifies for SSI and Medicaid.
Trying to return to work
An SSDI recipient wants to try a job.
He uses the trial work period.
Stopped working years ago
A former office worker stopped working six years before applying, when her multiple sclerosis worsened.
Her claim depends on proving disability before her date last insured, so her representative gathers neurology records from that earlier period.
What people miss
True, rarely explained, and it changes the outcome.
Most approvals happen on appeal
Do not give up.
Representatives are paid from back pay
Capped fees.
Compassionate Allowances exist
For severe conditions.
Medicaid can bridge to Medicare
If eligible.
Trial work period
Test working.
Common reasons people get stuck
Missing appeal deadlines
60 days.
Incomplete medical evidence
List everything.
Stopping treatment
Ongoing care supports claims.
Starting a new application instead of appealing
Often worse.
Not reporting work
Report earnings.
How it differs by state
SSDI is federal, but medical decisions are made by state Disability Determination Services and hearing wait times vary by region.
Key terms explained
The words on forms and letters, in plain English.
- Work credits
- Units earned from taxed work that determine whether you are insured for SSDI.
- Date last insured
- The last date you had enough recent work credits to qualify for SSDI.
- Substantial gainful activity (SGA)
- A level of monthly earnings that Social Security treats as showing you can work; it changes yearly.
- Disability Determination Services (DDS)
- The state agency that makes the initial medical decision on disability claims.
- Residual functional capacity
- Social Security's assessment of the most you can still do despite your impairments.
- Trial work period
- Months in which an SSDI beneficiary can work and earn without losing benefits.
Questions people ask
How do I apply for disability?
Who qualifies for SSDI?
How long does SSDI take?
What happens if SSDI is denied?
When does Medicare start with SSDI?
Can I work while on SSDI?
Do I need a lawyer for SSDI?
What is a Compassionate Allowance?
Can I get SSDI and SSI?
Is there back pay for SSDI?
What is the SSDI waiting period?
What conditions qualify for SSDI?
Can I get SSDI for mental illness?
How much does SSDI pay?
Can I apply for SSDI while still working?
Do I need a lawyer to win SSDI?
Will my SSDI be reviewed?
Can I get SSDI and a private disability pension?
Can my children get benefits if I receive SSDI?
Numbers to call
Free lines. We are not affiliated with any of them.
Official sources
Current figures and applications live here.