CPT Under Challenge: What Molecular Labs Should Do
Short answer: CMS has asked the public about alternatives to AMA's CPT code set, and a patient-advocacy group has sued to invalidate CPT's copyright. Neither changes billing today: CPT-4 remains the required HIPAA code set. For molecular labs, which depend on CPT and PLA codes, the practical step is to monitor and prepare, not to change anything.
Few things are as foundational to a lab's revenue cycle as the code on the claim. In the summer of 2026, that foundation drew unusual attention from a federal payer and from a federal court docket. This article summarizes what was actually proposed and filed, what it does and does not mean for genetic testing laboratories, and a short watch list. It is decision support for lab and revenue cycle leaders, not legal advice.
What CMS actually asked
The CY 2027 Medicare Physician Fee Schedule proposed rule was published July 16, 2026 at 91 FR 43842, file code CMS-1848-P. According to a CASRAI summary of the rule, it includes a request for information on CPT with comments due September 14, 2026. The RFI proposes no changes to codes, modifiers or rates.
CMS posed five questions. It asked about the harms or challenges associated with the AMA's licensing of CPT-4, which the rule text calls a monopoly; whether creating CPT-4 codes involves any process for identifying medical necessity; what alternatives could replace CPT-4 as the national standard; what more objective alternatives exist to the CPT Editorial Panel and RUC processes; and whether physician procedural services could be paid using ICD-10-PCS codes. The preamble also cites MedPAC's view that CMS has over-relied on specialty societies with a financial stake in the process.
The lawsuit
On August 13, 2026, PatientRightsAdvocate.org filed a declaratory judgment action against the AMA in the U.S. District Court for the Northern District of Illinois, Eastern Division, as reported by Becker's Hospital Review. The group bought a 2026 CPT Professional Edition and wants a ruling that it may scan and post it online for free. It says it has not copied or published the book while it awaits that ruling.
Discoveries in Health Policy describes three counts: that the CPT copyrights are invalid because CPT is incorporated into law, that free nonprofit publication would be fair use in the alternative, and that copyright misuse makes the copyright unenforceable for now. That commentator judges a sweeping invalidation unlikely and a narrower ruling more plausible; that is the author's view, not a prediction we endorse. The AMA has said, "We will vigorously defend the AMA's intellectual property rights," and describes CPT as "the uniform language of medicine."
The complaint also cites AMA financials. Per the suit, the AMA reported $296.4 million in 2025 revenue from Books and Digital Content, netting $267.5 million.
CPT 2027 arrived on schedule
None of this slowed the annual update. The AMA released the CPT 2027 code set on September 9, 2026, with 453 editorial changes: 299 new codes, 74 revisions and 80 deletions, effective January 1. It added 10 AI-related codes for a total of 43. The AMA's release highlighted maternity care, ventricular assist devices, diaphragmatic hernia repair, prostate biopsy, biofeedback, radiology and sleep medicine, and did not mention genomic or laboratory changes. Labs should still read the full code set rather than rely on the highlights.
Why molecular labs should care
Genetic testing is unusually dependent on the AMA code ecosystem. The AMA states that PLA (Proprietary Laboratory Analyses) codes are a specialized part of CPT that let labs and manufacturers identify advanced diagnostic laboratory tests and FDA-cleared or approved tests, especially where no Category I code exists. They are published by the CPT Editorial Panel, with a technical advisory group helping review applications, and are released quarterly. New codes take effect in the quarter after publication.
That matters because PLA codes are how many proprietary assays get a unique identity on a claim. When no specific code exists, labs fall back to unlisted codes with the denial exposure described in our guide to CPT 81479 unlisted molecular code denials. Identification layers such as DEX Z-codes sit on top of the CPT or PLA code, not in place of it. Any structural change to who governs those codes would ripple through coverage policies, payer edits and the denials your team works every day.
The same rule also contains a second RFI on duplicate laboratory and imaging tests. CMS said it is exploring billing clarifications, local contractor edits, payment recoupment and frequency limits, and cited LCD L33996 on vitamin D testing as an existing frequency-limit example. It is separate from the CPT question but is another sign that lab claims are getting more edit-driven.
What has not changed
Both RFIs are non-binding. CPT-4 remains the required code set under 45 CFR 162.1002(a)(5) unless HHS amends that regulation through separate rulemaking, which it has not proposed. The lawsuit has no ruling yet. The comment period closed September 14, and the final rule will come later. Anything that would replace CPT would need a long rulemaking process, so a near-term switch is not a planning scenario.
The upcoming PLA cycle also continues as normal. The AMA lists the PLA-TAG application review for October 20, 2026 and the CPT Editorial Panel meeting for November 4, 2026.
A practical watch list
These steps are general operational suggestions, not payer requirements.
Keep code-set licensing current. Confirm your billing system and any clearinghouse maintain valid CPT licensing and apply the January 1 update on time.
Map your test menu. Maintain a table of each assay, its current CPT or PLA code, any Z-code, and the payers that cover it, so a code change is a lookup, not a project.
Track the quarterly PLA releases. A new PLA code can replace an unlisted code, and using the wrong one is a compliance risk.
Watch three sources: the final CY2027 physician fee schedule rule, the Northern District of Illinois docket, and CMS statements on code-set alternatives.
Frequently asked questions
Is CMS replacing CPT as the billing code set?
No. The July 2026 request for information proposes no changes to codes, modifiers or rates. CPT-4 remains the required code set under 45 CFR 162.1002 unless HHS amends that regulation through separate rulemaking, which it has not proposed. Labs should keep billing CPT and PLA codes normally.
What is the PatientRightsAdvocate.org lawsuit about?
Filed August 13, 2026 in the Northern District of Illinois, it asks a court to declare that the AMA's CPT copyrights are invalid, or that free online publication is fair use, or that copyright misuse limits enforcement. The group has not copied the codebook while it awaits a ruling.
Do PLA codes depend on the AMA?
Yes. PLA codes are published by the AMA CPT Editorial Panel, with a technical advisory group reviewing applications. They are released quarterly and take effect in the quarter after publication. Any change to how CPT is governed could therefore touch the PLA pathway.
Does CPT 2027 change molecular lab codes?
The AMA's release highlighted maternity care, ventricular assist devices, hernia repair, prostate biopsy, biofeedback, radiology, sleep medicine and 10 new AI codes. It named no genomic or laboratory changes. Labs should still review the full code set and the quarterly PLA updates before January 1.
What should lab revenue teams do now?
Nothing disruptive. Audit your code-set subscriptions and update schedules, map your test menu to current CPT and PLA codes, and watch the final CY2027 physician fee schedule rule and the court docket. Document any change in code-set access so claims keep matching payer edits.
For workflow tooling that checks codes and documentation before submission, see the ScreenMyGene homepage.
Educational disclaimer: This article is for general educational and informational purposes only. It is not legal, coding, billing, compliance or medical advice, and it does not predict the outcome of any rulemaking or litigation. Payer policies and regulations change; consult qualified counsel or certified coders for specific questions.
Sources: CASRAI, "CMS Questions CPT's Role as Coding Standard" (CY 2027 PFS proposed rule, 91 FR 43842); Becker's Hospital Review, "AMA sued over CPT billing code copyright: 8 things to know" (Aug 2026); Discoveries in Health Policy, Aug 15, 2026; AMA, "AMA releases CPT 2027 code set" (Sept 9, 2026); TechTarget RevCycleManagement (Sept 10, 2026); AMA, CPT PLA Codes page.