If you are fully disabled, it may seem logical that a worsening condition should warrant a larger benefit. However, your benefit amount depends on your salary history, not the degree or type of disability. The important point is how your disability impacts your ability to work.
Upon claim acceptance, your disability payment amount is generally the same as your retirement benefit would have been at full retirement age.
While your payment will not increase because your health declines further, improved health could mean a loss of benefits. Disability claims receive periodic reviews, the frequency of which depends on the likelihood of your recovery and ability to return to work.
In general, your disability benefit will convert to a retirement benefit when you reach full retirement age, meaning that you cannot receive both disability and retirement benefits.
Upon a claim denial stating that you do not qualify as disabled, you have the right to appeal. If you miss the appeal deadline, you can file a new claim. You may qualify and meet the requirements for disability if there has been a significant decline in your health status since the original claim.
The disability claim process can be challenging because of the information requirements and waiting periods, and many people give up after a first claim denial. However, an appeal is always an option. If you have not missed the appeal deadline, you can apply to have your claim reconsidered after simply documenting your worsened health situation. Otherwise, even though it may take longer to prepare, you have the option to open a new claim.