When people talk about long-term disability (LTD) claims, they're often describing two different things that can overlap: private long-term disability insurance provided through an employer, and Social Security Disability Insurance (SSDI), the federal program administered by the Social Security Administration (SSA). Understanding how these systems relate — and where they diverge — matters a great deal for anyone who becomes unable to work due to a serious medical condition.
Short-term disability coverage typically replaces income for a few weeks to a few months. Long-term disability — whether private or through SSDI — is designed for conditions that last significantly longer.
For SSDI specifically, the SSA uses a strict definition: your medical condition must prevent you from doing substantial gainful activity (SGA) and must be expected to last at least 12 months or result in death. This 12-month durational requirement is one of the first filters the SSA applies when reviewing any claim.
SGA thresholds adjust annually. In recent years, the monthly SGA limit for non-blind individuals has been around $1,470–$1,550. Earning above that amount generally means the SSA considers you capable of substantial work, which can affect eligibility regardless of your diagnosis.
Many workers carry both. Here's how they differ in structure:
| Feature | Private LTD Insurance | SSDI |
|---|---|---|
| Who runs it | Private insurer / employer | Social Security Administration |
| Funding source | Employer/employee premiums | Payroll taxes (FICA) |
| Eligibility | Per your policy terms | Work credits + medical criteria |
| Benefit amount | Usually % of prior earnings | Based on lifetime earnings record |
| Duration | Per policy (often to age 65) | Until retirement age or recovery |
| Medicare access | No | Yes, after 24-month waiting period |
A critical intersection: most private LTD policies require you to apply for SSDI as a condition of receiving benefits. If SSDI approves you and awards back pay, your private insurer will typically recover the amount it already paid during the overlapping period. This is called an offset, and it's standard language in most group LTD policies.
SSDI claims move through several stages, and where you are in that process shapes your options and timeline.
Initial Application You file with the SSA, which sends your medical records to a state-level agency called Disability Determination Services (DDS). DDS reviews your medical evidence and work history to assess your Residual Functional Capacity (RFC) — essentially, what you can still do despite your condition.
Initial decisions typically take three to six months, though this varies by state and case complexity. Approval rates at this stage are roughly in the range of 20–40% nationally, though individual outcomes vary widely.
Reconsideration If denied, you have 60 days to request reconsideration. A different DDS examiner reviews the claim. Approval rates at reconsideration are historically low — this stage is often a procedural step toward a hearing.
ALJ Hearing The Administrative Law Judge (ALJ) hearing is where many claims are ultimately decided. You present your case in person (or via video), and approval rates at this stage are generally higher than at initial review. Having organized medical documentation and understanding how the SSA weighs RFC, vocational factors, age, and education becomes especially important here.
Appeals Council and Federal Court If the ALJ denies your claim, you can request review by the Appeals Council, and after that, federal district court. These stages are less common but available.
No two SSDI claims follow exactly the same path. The factors that most influence outcomes include:
If approved, SSDI back pay covers the period from your established onset date (minus the five-month waiting period) through your approval date. For claims that took a year or more to resolve, this can represent a significant lump sum — though the SSA may pay it in installments if it exceeds three times your monthly benefit.
Your monthly SSDI benefit is calculated from your Average Indexed Monthly Earnings (AIME) — a formula based on your highest-earning years on record. This means two people with the same diagnosis can receive very different monthly amounts depending on their earnings history.
SSDI approval also starts a clock toward Medicare eligibility. After 24 months of receiving SSDI payments, you become eligible for Medicare Parts A and B — regardless of age. For many people under 65 with serious conditions, this is one of SSDI's most valuable features.
If your income and assets are limited, you may also qualify for Medicaid in your state, and some individuals carry both — known as dual eligibility.
The program rules described here apply broadly. But whether your specific condition meets the SSA's definition of disability, whether your work record contains enough credits, how your RFC is assessed, and how your state's DDS evaluates your file — those are questions the rules alone can't answer. The same diagnosis leads to approval for one person and denial for another, depending on documentation, work history, age, and how the evidence holds together across the claim file. That gap between understanding the system and applying it to your own situation is exactly where individual outcomes are determined.