ADHD assessment and treatment in England sits on three load-bearing statutory layers, plus a softer policy-review overlay.
First, the commissioning layer. NHS Act 2006 ss.3 and 3A (with s.14Z31) tell each ICB which population it must commission for. The detail of who counts as an ICB's responsibility — and therefore whose ADHD assessment the ICB has to arrange — is set out in S.I. 2022/635 (with S.I. 2022/736 carving out NHS England-commissioned exceptions). That is the lever the PQ stream is actually attacking when it asks why ICBs are deprioritising ADHD or using Indicative Activity Plans as hard caps on Right to Choose referrals: the duty is statutory, but the manner of discharge — caps, prioritisation criteria, tariff acceptance — is operational.
Second, the provider-regulation layer. Whoever delivers the assessment — an NHS trust, an independent provider under Right to Choose, or a private clinic — is doing 'treatment of disease, disorder or injury' under Schedule 1 of the 2014 Regulated Activities Regulations and so must be registered with the CQC under Part 1 of the Health and Social Care Act 2008. S.I. 2025/232 removed the 2014 Regulations' expiry date and re-set the statutory review clock, so this CQC framework is now indefinite. S.I. 2026/495 confirms the Department is actively maintaining Schedule 1 (bringing sports and cultural-event treatment within the regulated-activity perimeter) — not ADHD-specific, but evidence that the regulatory perimeter remains live.
Third, the tariff and Payment Scheme layer. The NHS Payment Scheme guide prices for autism and ADHD services govern what providers are paid, which in turn governs supply. The 2025-26 PQ series (37041, 37042, 37792, 34829, HL13326) frames this as the binding constraint: Right to Choose only works if guide prices and ICB IAPs let providers operate at scale. There is no separate statutory instrument doing the tariff work; the Payment Scheme is an administrative product of NHS England's pricing functions under the NHS Act 2006.
Fourth, the policy-review overlay. The ADHD Taskforce (final report 6 November 2025) and the Independent Review into Mental Health Conditions, ADHD and Autism (interim report 31 March 2026) are not statutory; they are ministerial / NHSE-commissioned exercises that produce recommendations for action inside the three statutory layers above. Their output — particularly on prioritisation criteria, tariff design and service specification — is what would translate into regulatory change.
The regime cannot, by itself, set a national waiting-time standard for ADHD assessment: there is no constitutional or statutory standard for neurodevelopmental assessment equivalent to the 18-week RTT standard for physical-health pathways, which is why every constituency-level PQ in this corpus is met with an ICB-level answer.