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This depends on the verbiage of the subpoena. Because the subpoena is stating "all documents and records," then the verbiage states indeed all documents which would include any employer-kept files on the disability claim.
The party subpoenaed always has the option of filing a motion with the court asking the court to minimize the scope of the subpoena if it is unreasonably broad or burdensome. In addition, the other party (in this case, the ex-employee) normally receives a copy of the subpoena as well in most jurisdictions, and has a chance to file the same type of motion before the deadline set by the subpoena.
HIPAA provides an exception for information that would normally be protected under 45 C.F.R. § 164.512(e). See HERE. The company may also wish to send a letter to the ex-employer stating that such a subpoena has been received, and that under it, one will provide the disability claim files as well, so as to allow the ex-employer time to challenge the subpoena before the answer must be sent.
OR, the employer may file a motion asking the court to rule on the verbiage being overly-broad and have the Judge clarify whether or not this includes the disability claim.
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