Guide · Updated
What's the Difference Between a CA-2 and a CA-2a?
A CA-2 starts a new claim for an occupational disease caused by work over more than one shift. A CA-2a is a Notice of Recurrence. You use it when an injury or illness OWCP already accepted comes back on its own, causing lost work or a renewed need for treatment, with no new injury or exposure.

The CA-2 and the CA-2a look almost the same on paper, but they do very different jobs. One starts a brand-new claim. The other reopens care or pay for a claim OWCP already accepted. Picking the wrong one can slow things down, so here is how to tell them apart.
What the CA-2 is for
The CA-2 is the Notice of Occupational Disease and Claim for Compensation. It starts a new claim for a condition your work caused or made worse over more than one workday or shift (20 CFR 10.5(q)). Think of hand and wrist problems from repeated tasks, or back trouble from years of the same lifting.
Key points:
- You file it with your employer, and it can be filed online through ECOMP.
- You have 3 years from when the condition began. If you did not know your work caused it, the clock starts when you knew, or reasonably should have known (20 CFR 10.101).
- You must explain which job duties caused the problem, and your doctor must explain the link.
If you were hurt by one event in one shift, you need a CA-1 instead. See the difference between a CA-1 and a CA-2.
What the CA-2a is for
The CA-2a is the Notice of Recurrence. It is not a new claim. It is for an injury or illness OWCP has already accepted that has come back.
Federal rules say to report a recurrence on the CA-2a when it causes you to lose time from work and lose pay, or when you need treatment again after being released from care (20 CFR 10.104(a)).
Two kinds of recurrence
The rules define two types (20 CFR 10.5(x) and (y)):
- Recurrence of disability. You went back to work, then could not work again because your accepted condition changed on its own, with no new injury or new exposure. This also covers a light-duty job made for your work restrictions that is taken away, or changed so it goes beyond your limits. It does not apply if the light duty was withdrawn for misconduct, poor performance or downsizing.
- Recurrence of medical condition. You were released from treatment, and now you need more treatment for the accepted condition, but you have not stopped work. Ongoing care you never stopped getting does not count, and neither does an exam with no treatment.
The key question: is anything new?
This is the line that matters most. The rules say not to file a CA-2a when there is a new injury, a new occupational disease, or a new event that adds to an existing occupational disease. In those cases, you file a new CA-1 or CA-2 (20 CFR 10.104(a)).
A simple way to think about it:
- Same problem came back on its own? CA-2a.
- New accident at work? CA-1.
- New or added work exposure over time? CA-2.
For example, if your accepted shoulder condition flares up months after you went back to full duty, with no new event, that points to a CA-2a. If you hurt that same shoulder again lifting a box last Tuesday, that is a new injury, so you would file a CA-1.
What you need for a CA-2a
You carry the burden of showing the recurrence is caused by the original injury (20 CFR 10.104(b)). That means:
- A detailed statement from you, as described on the form. Your employer may add comments.
- A detailed medical report from your attending physician that explains why your current problem comes from the accepted injury.
- Records of any care you got after going back to work.
One more rule: if OWCP has already made a loss of wage-earning capacity decision in your case, a recurrence claim is not available. You would instead ask OWCP to change that decision.
Continuation of Pay after a recurrence
If your original claim was a traumatic injury (CA-1), you may be able to use leftover Continuation of Pay days. This applies when you stop work again within 45 days of first returning, you elect regular pay on the CA-2a, and you had not used all 45 days (20 CFR 10.207).
Getting the medical part right
The doctor’s report often decides a recurrence claim. It should describe your current exam, your history since the first injury, and a clear medical reason the condition returned. Our page on OWCP doctors explains how treating physicians document federal claims, and our OWCP forms page walks through the other forms you may need. You can also read about the CA-20 attending physician’s report.
Both forms are available on the DOL FECA forms page.
How Alivio can help
If an old work injury is acting up, Alivio Health & Rehab can help you sort out which form fits and get the medical records OWCP needs. We are enrolled with OWCP, and our physician, Dr. Peter Ruiz, reviews and signs FECA medical reports. Call (956) 679-3451 for a free consultation at our McAllen or Harlingen clinic.
Quick answers
Can I use a CA-2a for an old CA-1 injury?
Yes. A recurrence can follow an accepted traumatic injury or an accepted occupational disease. What matters is that the same accepted condition came back on its own, not that a new accident or new exposure happened. If something new happened at work, file a new CA-1 or CA-2.
Do I need a doctor's report with a CA-2a?
Yes. You carry the burden of showing the recurrence is caused by the original injury. Federal rules say you should arrange for a detailed report from your attending physician, as described on the CA-2a, plus reports for any care you received after you went back to work.
Sources
Medically reviewed by Peter Ruiz, MD, Medical Director. MD · Family Medicine · Texas Medical Board license N2270
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