Monthly-Invoicing Clauses and Material Breach: Noncompliance Does Not Excuse Payment Absent Contractual Centrality

1. Introduction

Quest Diagnostics Inc. v CSRNC, LLC (2026 NY Slip Op 02183 [248 AD3d 1474], 3d Dept Apr. 9, 2026) arises from COVID-19-era laboratory testing arrangements between a statewide diagnostic provider (Quest Diagnostics Inc., plaintiff) and a long-term care facility (CSRNC, LLC d/b/a Capstone Center for Rehabilitation and Nursing, defendant).

In May 2020, Executive Order No. 202.30 required long-term care facilities to arrange twice-weekly COVID-19 testing of personnel. Against that backdrop, plaintiff began performing COVID-19 testing for defendant in August 2020. The parties later executed:

  • a January 5, 2021 agreement setting COVID-19 testing at $100 per test and placing payment responsibility on defendant after invoice; and
  • a June 2021 amendment adjusting influenza and combined influenza/COVID pricing, retroactive (as stated) to May 2020.

Plaintiff claimed defendant refused to pay an outstanding balance exceeding $200,000. Plaintiff sued for breach of contract and quantum meruit and moved for summary judgment. Supreme Court denied summary judgment, finding (as relevant) ambiguity and factual questions. Plaintiff appealed.

The appellate dispute narrowed to a practical contracting question with broader healthcare-services implications: Does an alleged failure to invoice “monthly,” as contemplated by the agreement, amount to a material breach that excuses the facility’s duty to pay for services rendered?

2. Summary of the Opinion

The Third Department modified the order. It held that plaintiff established prima facie entitlement to summary judgment on liability for breach of contract and that defendant failed to raise a triable issue of fact that plaintiff’s alleged failure to invoice monthly was a material breach excusing payment. The matter was remitted for an inquest on damages.

Because plaintiff prevailed on contract liability, its quantum meruit arguments were deemed academic under the rule barring duplicative recovery in contract and quasi-contract.

3. Analysis

A. Precedents Cited

1) Elements of breach and summary-judgment framing

  • Turner v Quinones, 244 AD3d 1331 (3d Dept 2025): supplied the standard elements of a breach of contract claim (contract, performance by plaintiff, breach by defendant, damages). The court used this as the organizing template for assessing plaintiff’s proof.
  • Almark Holding Co., LLC v Abbas, 241 AD3d 1410 (2d Dept 2025); Ithaca Montessori Sch. v Pfeffer, 239 AD3d 1128 (3d Dept 2025); Bank of Am., N.A. v Neroni, 226 AD3d 1273 (3d Dept 2024): cited for the proposition that documentary and affidavit proof can establish prima facie entitlement to judgment as a matter of law on liability where the opposing party fails to raise a material factual dispute. Here, invoices, the agreement/amendment, and the senior program manager’s affidavit sufficed to shift the burden to defendant.

2) Material breach doctrine (and when nonperformance excuses payment)

  • SCE Envtl. Group, Inc. v Murnane Bldg. Contrs., Inc., 242 AD3d 1457 (3d Dept 2025): provided the operative definition: a material breach is “so fundamental” that it defeats the essential purpose of the contract; such a breach excuses the nonbreaching party’s performance and bars the breaching party’s contract claim.
  • Exportaciones Del Futuro Brands, S.A. De C.V. v Authentic Brands Group, LLC, 201 AD3d 499 (1st Dept 2022): reinforced that only a truly material breach excuses performance; it supports the court’s reluctance to elevate a billing-timing dispute into a forfeiture of payment.
  • Willoughby Rehabilitation & Health Care Ctr., LLC v Webster, 134 AD3d 811 (2d Dept 2015) and Wolfson v Faraci Lange, LLP, 103 AD3d 1272 (4th Dept 2013): used as analogs where alleged departures from contractual procedure did not rise to material breach. These cases undergird the court’s conclusion that not every contractual “shall” is essential-purpose-defeating.
  • Bay St. Landing Homeowners Assn., Inc. v Meadow Partners, LLC, 169 AD3d 985 (2d Dept 2019) (and compare Andesco, Inc. v Page, 137 AD2d 349 (1st Dept 1988)): invoked to emphasize the importance of contractual text in identifying whether a particular obligation is intended to be condition-like or fundamental. The Third Department found no language signaling that timely monthly invoicing was a “dealbreaker” whose breach would excuse payment.

3) Contract vs. quasi-contract and the bar on double recovery

  • Villnave Constr. Servs., Inc. v Crossgates Mall Gen. Co. Newco, LLC, 201 AD3d 1183 (3d Dept 2022): applied to render the quantum meruit dispute academic once contract liability was established—reaffirming that a party may not recover under both contract and quasi-contract theories for the same performance.

4) Plain meaning, integration, and excluding course-of-dealing evidence

  • Town of Colonie v Global Contr. & Painting, Inc., 237 AD3d 1280 (3d Dept 2025) and EDW Drywall Constr., LLC v U.W. Marx, Inc., 189 AD3d 1720 (3d Dept 2020): supplied the controlling principle that when a contract is “complete, clear and unambiguous,” courts enforce its plain meaning rather than resort to extrinsic evidence.
  • Matter of Hirschfeld, Stern, Moyer & Ross, 286 AD2d 611 (1st Dept 2001) (and compare Mizrahi v Cohen, 104 AD3d 917 (2d Dept 2013), lv dismissed 21 NY3d 968 [2013]): supported excluding parol evidence about an alleged course of dealing in which defendant would provide insurance information and plaintiff would bill insurers directly. The contract instead stated plaintiff had the right to bill defendant, and defendant had to pay within 30 days of invoice by specified payment methods.

B. Legal Reasoning

  1. Plaintiff met its prima facie burden on liability. The court emphasized the agreement/amendment (pricing and payment obligations), performance (testing services), nonpayment, and damages (over $200,000), supported by invoices and an affidavit. Defendant did not meaningfully dispute performance, pricing, or that services were provided.
  2. “Monthly invoicing” was not shown to be essential to the contract’s purpose. Section 3.2 said defendant would be invoiced monthly and must pay within 30 days of receiving an invoice. Defendant argued that not invoicing monthly was a material breach excusing payment, primarily because timely invoices were allegedly needed for insurance/Medicaid processes. The court rejected materiality for three contract-centered reasons:
    • Course of performance context: by January 2021, plaintiff had already tested for about five months without sending monthly (or any) invoices, yet the parties executed the contract without adding language making invoice timing a condition precedent to payment or a basis to refuse payment.
    • Contract silence on reimbursement mechanics: the agreement and amendment did not mention insurance or Medicaid billing as part of the parties’ allocation of responsibility, undermining defendant’s attempt to treat invoicing timing as fundamental.
    • Express payment promise: defendant expressly agreed to pay plaintiff within 30 days of each invoice via specified methods; that promise was not textually conditioned on “timely” monthly invoicing as a forfeiture-triggering term.
  3. No triable issue from “course of dealing” because the billing clause was unambiguous. Defendant argued the parties’ practice required defendant to send insurance info and plaintiff to bill insurers directly. The court treated the agreement as complete and unambiguous: plaintiff had the right to bill defendant; defendant had the obligation to pay after invoice. That foreclosed parol evidence to rewrite billing obligations.
  4. Remedy: liability established; damages to be proven at inquest. Even with liability resolved, the exact amount owed (accounting for amended pricing and invoice adjustments) remained for an inquest.
  5. Quantum meruit becomes academic. Once contract liability governs payment for the same services, quasi-contract is not an additional path to recover.

C. Impact

The decision clarifies—particularly in high-volume healthcare services contracts formed under emergency conditions—that: a provider’s noncompliance with an administrative billing cadence (e.g., “monthly invoicing”) will not automatically be treated as a material breach that excuses payment, absent contractual language or circumstances showing that timing defeats the contract’s essential purpose.

Likely effects include:

  • Reduced leverage for nonpayment defenses based on invoicing cadence alone when services and pricing are undisputed and the contract lacks a clear forfeiture/condition clause.
  • Drafting lessons for facilities and payors: if timely invoicing is genuinely essential due to reimbursement windows, contracts should expressly (i) tie timing to conditions precedent, (ii) specify consequences, and (iii) define reimbursement cooperation duties (including insurance/Medicaid billing mechanics).
  • Reinforcement of textualism in billing disputes: parties cannot rely on “course of dealing” to add insurer-billing obligations that the written agreement omits, where the writing is complete and unambiguous.

4. Complex Concepts Simplified

  • Summary judgment: a pretrial ruling granted when there is no genuine dispute of material fact and the movant is entitled to judgment as a matter of law. Here, plaintiff won summary judgment on liability only.
  • Prima facie showing: enough proof to shift the burden to the other side to show a real factual dispute. Invoices + contract + affidavit did that here.
  • Material breach: not just any breach; it must be so serious it defeats the contract’s essential purpose. Only then can the other party stop performing (stop paying).
  • Parol evidence / course of dealing: outside evidence about what parties said or did cannot be used to change a written contract that is clear and complete. Defendant’s “we always sent insurance info and Quest billed insurers” narrative could not override the written billing clause.
  • Inquest on damages: a proceeding (often before the trial court) to calculate how much money is owed after liability is decided.
  • Quantum meruit: payment based on the value of services when no enforceable contract covers them; unavailable as an additional recovery when a valid contract controls.

5. Conclusion

Quest Diagnostics Inc. v CSRNC, LLC establishes a practical rule for contract enforcement in New York: an alleged failure to invoice monthly—without clearer contractual signals of essentiality or conditional payment—does not constitute a material breach excusing nonpayment for services rendered at agreed rates. The Third Department’s insistence on contract text, coupled with its refusal to transform billing cadence into a payment-forfeiture device, provides guidance for healthcare contracting and any recurring-services agreement where invoicing timing becomes a post-performance dispute.