Aetna is a fiduciary for the purpose of Section 503 of Title 1 of ERISA. Aetna has complete authority to determine whether and to what extent eligible individuals and beneficiaries are entitled to coverage and to construe any disputed or doubtful terms under this Group Agreement.
Why this verdict
Two of five models read this as partial, two as bad and one as missing, so no verdict had a majority; under the median rule the middle vote falls in the bad or missing tier, and a re-read of pages 10, 12 and 47 shows the text is not silent, so the verdict is bad. The only fiduciary language is section 9.4 of the Medicare Group Agreement (page 12), which makes Aetna a fiduciary solely for ERISA claim determinations and pairs that with complete authority to construe the agreement under a deferential arbitrary and capricious standard. Section 7.1 (page 10) frames the parties as independent contractors, and page 47 has the county agree that manufacturer payments belong exclusively to Aetna or CVS Caremark with no legal interest for the county. Nothing extends a duty of loyalty or care to formulary, network or pricing decisions, and the base agreement that might hold one is not in the file. Claude Opus 5 and GPT 5.6 Sol treated the narrow ERISA clause as a weaker version of the model duty; Gemini 3.1 Pro called it missing because the base agreement is absent.
Compare with the model contract · § Section 2.4
The PBM owes duties of loyalty and care solely to the plan and its members, must disclose all direct and indirect compensation and every economic conflict, and must disgorge anything retained in breach without the plan proving damages.
Without a loyalty duty the PBM is free to put its own affiliates and revenue ahead of the plan when it exercises discretion over formularies, networks and pricing.
Where the council disagreed 5 published readings
Only readings under the score’s rubric version are shown here. Model confidence and agreement do not establish legal correctness.
Claude Opus 5Weaker than the model
The only fiduciary language in the file is narrow, covering claim determinations under Section 503 of ERISA, and it is paired with complete discretionary authority and a deferential standard of review. Nothing extends a duty of loyalty to the financial side of the arrangement, and page 47 states that manufacturer payments belong exclusively to Aetna and its affiliate with no legal interest for the county. A model style duty to act solely in the interest of the plan and its members would need to cover formulary, network and pricing discretion, not just benefit appeals.
Aetna is a fiduciary for the purpose of Section 503 of Title 1 of ERISA. Aetna has complete authority to determine whether and to what extent eligible individuals and beneficiaries are entitled to coverage and to construe any disputed or doubtful terms under this Group Agreement.
Page 12 · Rubric v2
Gemini 3.1 ProNot addressed
The base agreement is not in the file. The amendment mentions Aetna acts as a fiduciary for ERISA claim determinations, but does not address broad fiduciary duties of care or loyalty for PBM services.
No page citation · Rubric v2
GPT 5.6 SolWeaker than the model
Aetna accepts fiduciary status only for ERISA claim determinations. The clause does not impose loyalty and care solely to the plan and members, require conflict disclosure, or require disgorgement. It also grants Aetna broad interpretive discretion, so it is substantially narrower than the model protection.
Aetna is a fiduciary for the purpose of Section 503 of Title 1 of ERISA.
Page 12 · Rubric v2
Grok 4.6Contradicts the model
The attached Medicare Group Agreement names Aetna a fiduciary only for ERISA claims review and gives it complete coverage authority unless it acts arbitrarily and capriciously. The same packet says the parties are independent contractors, not agents of one another. That is the opposite of the loyalty and care duty to the plan and members in the model contract published by Mark Cuban and collaborators. The 2023 base agreement is not in the file, so no broader PBM fiduciary clause appears here either.
Aetna is a fiduciary for the purpose of Section 503 of Title 1 of ERISA. Aetna has complete authority to determine whether and to what extent eligible individuals and beneficiaries are entitled to coverage and to construe any disputed or doubtful terms under this Group Agreement.
Page 12 · Rubric v2
Kimi K3Contradicts the model
The Group Agreement expressly frames Aetna as an independent contractor, not a fiduciary to the County or its retirees. The only fiduciary statement anywhere in the file is that Aetna is a fiduciary for the purpose of Section 503 of Title 1 of ERISA for claims decisions, with an abuse of discretion standard, which is the narrow claims administrator role and nothing like the duty of loyalty over formularies, networks and pricing that the model contract published by Mark Cuban and collaborators requires. The base agreement, where a broader duty might theoretically sit, is not in the file.
The relationship between the Parties is a contractual relationship between independent contractors. Neither Party is an agent or employee of the other in performing its obligations pursuant to this Group Agreement.
Page 10 · Rubric v2
Finding provenance
Finding ID
3387f078-ada7-4e15-9701-c76b785025e6
Reviewed
Sep 30, 2026
Reviewer
owner
Recorded confidence
0.5
Model votes
Kimi K3: bad; Grok 4.6: bad; GPT 5.6 Sol: partial; Claude Opus 5: partial; Gemini 3.1 Pro: missing
Published reports 3 write-ups
Published Sep 30, 2026
Good news, bad news: the short version
Good news
The rebate table has real numbers. Harris County receives the greater of 100% of collected rebates or a fixed minimum per brand script: $406.62 at retail, $926.08 at retail 90 and mail order, and $5,374.71 for specialty (page 37).
Discount and dispensing fee guarantees are measured and reconciled separately, so a surplus on one cannot hide a shortfall on another (page 39).
Members pay the lesser of their cost share, the pharmacy's usual and customary charge, MAC or the discounted AWP price at the counter (page 39), and the Caremark Cost Saver program routes a claim to a cheaper non Aetna network when one exists (page 57).
The county keeps sole discretion to accept or reject the formulary Aetna offers (page 46).
There is an annual market check against similar employers in the second quarter of each contract year (page 43).
The county gets one rebate audit and one electronic claim audit a year (page 48).
Bad news
Spread pricing is written into the deal. Under the Traditional or Lock-In arrangement (page 43) the amount charged to the county may differ from what the pharmacy is paid, and Aetna retains the difference (page 44).
The 100% rebate promise applies only to Rebates as narrowly defined. Manufacturer administrative fees, payments for data and education, network transmission fees, medical benefit specialty rebates and value based contracting payments all stay with Aetna or CVS Caremark, and the county agrees it has no legal interest in them (pages 46 and 47). Rebates arrive 180 days after the quarter ends (page 45).
Specialty drugs must be filled at CVS Specialty pharmacies with no retail fills (page 40) and mail order goes to CVS Caremark Mail Service Pharmacy (page 31), both priced off AWP rather than at cost.
Aetna may amend the Medicare Group Agreement alone on 30 days written notice (page 14) and may make an Equitable Adjustment to the financial terms on stated triggers (page 44).
Leaving before December 31, 2028 means Aetna keeps earned but unpaid rebates, the year's guarantees become null and void, and the county refunds prorated allowances as an Early Termination Fee (page 47).
The county pays for its own data: $1,000 per file for accumulator files and historical claims data, and $5,000 per file for audit claim files over 24 months old (page 54).
The pricing proposal cannot be released to any third party without Aetna's written consent (page 27), and the county has agreed not to oppose Aetna's efforts to block a public records release in court (page 22).
What we could not see
Nothing in the 87 pages is blacked out. The gap is scope: the 2023 base agreement and the Prescription Drug Services Schedule are incorporated by reference but not attached (pages 2 and 38), so the governing definition of Rebates and the full audit terms are outside this file. Those items are scored as not addressed, not as unclear.
The number
Against the 23 item rubric drawn from the model PBM contract published by Mark Cuban and collaborators, the amendment scores 15 out of 100, a Red flag grade, with all 100 points of weight scored, none unclear and the gag clause flag set. No item met the model; eight items were weaker than the model and supply every point. The change that would move the score most is replacing the lock in arrangement on page 44 with pass through pricing, which carries 9 points of weight; a rebate definition that captures every manufacturer payment (pages 46 and 47) would address the heaviest item of all.
The reference is the open source PBM contract published by Mark Cuban and collaborators, version 3.5. BetterBuy Rx did not write it and is not affiliated with or endorsed by its authors. Read the original model contract.