ADMISSIBILITY OF PARTIALLY CONTROVERTED §18.001 AFFIDAVITS
The Texas Supreme Court revisited §18.001 initial and controverting affidavits[1] in the Tatia Ortiz v. Ramu Nelapatla[2] case.
The Supreme Court provided important guidance for attorneys grappling with Section 18.001. The Court answered the question of what happens when a counteraffidavit only partially challenges the costs identified in an initial affidavit. The Court also touched on the admissibility of both initial and counteraffidavits.
Case Overview
The underlying case involved a car accident. Tatia Ortiz sued Ramu Nalapatla after an accident in a parking lot. Both cars were backing out at the same time and a collision ensued.
Ortiz served §18.001 initial affidavits for three healthcare providers. Nalapatla served two counteraffidavits, which controverted portions of the claimed medical costs. The authors of the counteraffidavits attested that the uncontroverted charges were reasonable.
Ortiz contended at trial that the uncontroverted portions of the initial affidavits were admissible and that she was not required to present other evidence to prove the reasonableness of those charges. The trial court rejected this argument and did not allow Ortiz to offer the partially controverted initial affidavits into evidence.
Interestingly, Ortiz then attempted to introduce into evidence the counteraffidavits served by Nalapatla. The trial court refused this offer on the grounds of hearsay.
The jury awarded Ortiz lower medical damages than originally sought. Ortiz appealed on the grounds that it was error to exclude the partially controverted initial affidavits and the counteraffidavits.
Partially Controverted Affidavits are Admissible with Redactions
The Texas Supreme Court noted that a counteraffidavit may controvert an entire itemized statement of services and charges, or it may partially controvert an initial affidavit[3]. In essence, each individual charge reflected on a statement attached to an initial affidavit is a claim that may be controverted. When a compliant controverting affidavit controverts only a portion of the claimed amounts it does not render the entire initial affidavit inadmissible.
The Court went on to state that Section 18.001 anticipated that “portions of an itemized bill or statement may be redacted or otherwise not presented to the jury.” (emphasis added).
As for the controverted charges, claimants are offered the option to either offer expert testimony (live at trial or via deposition excerpts) or to abandon recovery on those claims.
The Redaction Burden Falls on the Party Introducing the Initial Affidavits That Have Been Partially Controverted
The Court clearly and unequivocally placed the burden of preparing redactions on the party seeking to rely on the §18.001 initial affidavit.
If a claimant chooses to rely on an initial affidavit that has been partially controverted, they must redact the controverted costs and the statements in the initial affidavit regarding the reasonableness of the costs and necessity of those services. [4]
Controverting Affidavits May be Admissible to Support the Plaintiff’s Claims
In this case, the counteraffidavit served by Nelapatla stated what a reasonable charge for each service would be. The counteraffidavit essentially stated that the charged amounts were unreasonable and that a reasonable charge would be $x for each item. [5]
Ortiz attempted to rely on the counteraffidavit as it clearly stated what a reasonable charge would be. While the trial court rejected this offer, the Texas Supreme Court held that counteraffidavits were admissible evidence and could offer some evidence as to what a reasonable charge was.
Case Impact
The Ortiz case does an excellent job of summarizing the law with regard to Section 18.001 initial affidavits and counteraffidavits. However, in some situations the case may very well prove hard to apply in practice.
Controverting Affidavits May Not Omit the Basis of the Affiant’s Opinions
The Court noted that counteraffidavits that contest the reasonableness of expenses cannot be admissible to prove that expenses are reasonable. However, the court was quick to note that a counteraffidavit that “affirmatively attests to what portion of the expense is reasonable…is admissible to support those claims.”
This begs the question of: May a counteraffidavit contest charges without providing some sort of baseline?
The text of Section 18.001 states that a counteraffidavit “must give reasonable notice of the basis” the party intends to controvert the claim.[6] The “reasonable notice” standard is not defined in the text of the statute, but the Supreme Court has held that its meaning is similar to the “fair notice” requirement for pleadings.[7] A pleading provides “fair notice of the claim involved” if the opposing party can ascertain the nature and basic issues in controversy and what testimony will be relevant. The Court noted that the standard measures whether the pleadings, or in the case of Section 18.001, the counteraffidavit “provided the opposing party sufficient information to enable that party to prepare a defense or a response”.
The Supreme Court noted the “reasonable notice” standard was satisfied in the In re Allstate case when the counteraffidavit provided a comparison of the charges set forth in the initial affidavits with the median charges for the same services during the same timeframe in the same zip code according to a billing database.[8]
A counteraffidavit that does not provide an analysis of the charge at hand, arguably, does not give “reasonable notice of the basis” of the opinion.
In practice, counteraffidavits typically state what a reasonable amount for a charge is. This identified amount is the basis of the opinion that the claimed amount is excessive. A blanket statement that the claimed charges were not reasonable without any type of baseline or comparison of charges may be deficient.
Relying on Controverting Affidavits Puts Plaintiffs in an Awkward Position
Counteraffidavit authors are often designated as expert witnesses. Plaintiffs often attempt to strike or limit those opinions to keep them from coming in at trial.
An interesting consequence of the Ortiz case may limit the ability of Plaintiff attorneys to challenge defense experts on their knowledge of billing charges. It would be contradictory for a Plaintiff to argue that a defense expert should be excluded for lacking understanding of charges, yet rely on those billing opinions to bolster their own claims.
The Case May Create Satellite Litigation Regarding Redactions
The Court noted that medical bills often contain many services and charges and that Section 18.001 contemplates that these items may be controverted on an item-by-item basis. However, the Court went on to state that the party offering the initial affidavit (the plaintiff) “must redact the controverted costs and the statements in the [initial] affidavit regarding the reasonableness and necessity of those costs.”
This will raise the question of whether a counteraffidavit does in fact actually controvert each item reflected on an initial affidavit. This may encourage depositions of counteraffiants whereby they will be questioned at length on a line-by-line basis for each charge reflected in a counteraffidavit.
Once redacted, the Court supposes that the plaintiff will offer the redacted initial affidavit into evidence at trial. However, this ignores the reality. The parties may very well disagree on whether the redactions are accurate or sufficient. Any such dispute would need to be resolved by the trial court.
[1] Tex. Civ. Prac. & Rem. Code §18.001.
[2] Tatia Ortiz v. Ramu Nelapatla, ___ S.W. 4th __ (Tex. May 1, 2026) (No. 23-0953). The opinion was released on May 1, 2026, but can be accessed via the following link: https://www.txcourts.gov/media/1462652/230953.pdf
[3] The Court clarified that a challenge to the necessity of treatment is distinct from a challenge to the reasonableness of the costs for that service. Id. (A counteraffiant may challenge “the necessity of a service or part of a service, the reasonableness of a cost or part of a cost, or both the necessity and reasonableness of an itemized service charge.”)
[4] Section 18.002 provides forms for initial affidavits. Each form includes a statement similar to ,“The service I provided was necessary and the amount that I charged for the service was reasonable at the time and place that the service was provided.” Tex. Civ. Prac. & Rem. Code §18.002. These statement in the initial affidavit may need to be redacted.
[5] For a $250 charge, $129.56 of the charge was reasonable. For another $2,200.00 charge, $2,090.00 of the charge was reasonable.
[6] Tex. Civ. Prac. & Rem. Code §18.001(f) (“The counteraffidavit must give reasonable notice of the basis on which the party serving it intends at trial to controvert the claim reflected by the initial affidavit….”).
[7] In re Allstate Indem. Co., 622 S.W.3d 870 (Tex. 2021)
[8] Id.




