This question has been addressed in 1 Texas court opinion:
COA14 — January 29, 2026
In a mandamus proceeding, the Fourteenth Court of Appeals addressed whether experts who author counteraffidavits under Texas Civil Practice and Remedies Code Section 18.001 are protected from deposition by the consulting expert privilege. The trial court had ordered the depositions of four experts who provided counteraffidavits but were not designated as testifying witnesses. Analyzing Texas Rules of Civil Procedure 192.3(e) and 192.7, the appellate court determined that because the experts were not designated to testify and their work was not reviewed by any testifying experts, they remained privileged consultants. The court held that serving a counteraffidavit does not constitute a waiver of the consulting expert privilege, and thus the trial court abused its discretion by compelling the depositions.
Litigation Takeaway
“Attorneys can effectively challenge the reasonableness of medical or professional expenses by using Section 18.001 counteraffidavits from consulting experts who remain immune from deposition, so long as those experts are never designated to testify and their work product is not shared with testifying experts.”