A Unit of Dental Activity, or UDA, is the measure NHS England uses to set, deliver and pay for the vast majority of NHS dental work carried out under a General Dental Services (GDS) or Personal Dental Services (PDS) contract. Every NHS dental contract in England specifies an annual UDA target, and the practice is paid according to that target being met, not according to the number of patients seen or the actual clinical time involved. Understanding how UDAs work, and where the numbers most often become disputed, matters whether you are running a practice, buying one, or dealing with a shortfall the commissioner is chasing.
This post explains the UDA system in full, then looks at where disputes typically arise between contractors and commissioners. If you are here because a specific practice has fallen short of its target, our companion piece on UDA clawback deals with the financial recovery process in detail. If you are assessing a practice before buying it, see our guide to how to buy a dental practice and our note on the NHS dental contract partnership route, since UDA performance and the mechanics of transferring the contract are closely linked in any acquisition. For wider NHS contract compliance questions beyond UDAs, our NHS regulatory compliance team can help.
What a UDA Actually Is
Rather than paying a dentist a fee for each individual procedure, NHS England allocates each GDS or PDS contract a number of UDAs to deliver over the contract year, and pays the contract value in return for that activity being delivered. The number of UDAs attached to a course of treatment depends on which of three treatment bands the treatment falls into, not on how long it takes, how complex it is clinically, or how many appointments it requires.
| Band | What it covers | UDA value | Patient charge from 1 April 2026 |
|---|---|---|---|
| Band 1 | Examination, diagnosis (including X-rays where needed), advice, scale and polish if clinically required, fluoride varnish application | 1 UDA | £27.90 |
| Band 2a | Band 1 treatment plus straightforward fillings or extractions | 3 UDAs | £76.60 |
| Band 2b | Band 1 treatment plus non-molar root canal work or multiple fillings/extractions | 5 UDAs | £76.60 |
| Band 2c | Band 1 treatment plus molar root canal work | 7 UDAs | £76.60 |
| Band 3 | Band 1 and 2 treatment plus crowns, dentures, bridges and other laboratory work | 12 UDAs | £332.10 |
Band 2 was split into these three sub-bands, 2a, 2b and 2c, for courses of treatment accepted on or after 25 November 2022, based on the clinical detail submitted in the course of treatment record. The patient-facing charge for all Band 2 treatment stayed a single figure regardless of sub-band, the sub-division exists for NHS activity measurement purposes, not for patient billing.
A crucial, and commercially significant, feature of the system is that UDAs are claimed per course of treatment, not per appointment. If a patient needs a crown that requires several visits, the practice still claims the 12 UDAs for that Band 3 course once, on completion (or acceptance, depending on the specific claim rules), regardless of how many appointments or how much chair time it actually took. This flat-rate structure is precisely why UDA delivery and case mix matter so much commercially: a practice with a high proportion of complex, multi-visit Band 3 work can be working considerably harder for the same UDA total than one weighted towards routine Band 1 checks.
How the Annual Target and Contract Value Work
Each GDS or PDS contract specifies an Annual Contract Value and a corresponding UDA target for the year, historically set by reference to the practice’s past activity levels, and since adjusted through successive rounds of contract negotiation and reform. The practice is paid the contract value in monthly instalments throughout the year, in return for an undertaking to deliver the contracted number of UDAs.
The rate paid per UDA (sometimes called the UDA value) is set out in each individual contract and varies considerably between practices, sometimes markedly, reflecting how contract values were originally calculated back when the current system was introduced and adjusted since. There is no single national UDA rate that applies uniformly to every contract, so any figure quoted as a “typical” or “average” UDA value should be treated as indicative only, not as the rate that applies to a specific practice. Anyone assessing a specific contract, whether as the current holder or a prospective buyer, needs to check the actual contracted rate in the contract documentation itself.
Tolerance Bands: How Much Room a Practice Has
NHS England’s guidance on year-end reconciliation sets out tolerance thresholds that determine what happens if a practice does not deliver exactly 100% of its contracted UDAs:
- 96% to 100% delivery, the shortfall is carried forward into the following contract year’s target rather than triggering financial recovery. The practice has not been penalised, but the gap has to be made up later.
- Below 96% delivery, the commissioner recovers the overpayment relating to the UDAs contracted but not delivered, calculated against the contracted UDA rate. This is the clawback threshold, and it is the point at which underperformance becomes a direct financial liability rather than simply a target carried forward. Our UDA clawback post explains exactly how that calculation works and what a practice can do about it.
- Up to 102% delivery, standard overperformance tolerance, generally without additional payment above the contracted rate unless the commissioner has agreed otherwise.
- Above 102%, up to 104% or 110% in specific cases, only achievable with prior commissioner agreement, for example under approved oral health programmes or where the commissioner has expressly agreed additional funded activity.
This tolerance structure is confirmed as continuing unchanged into the 2026/27 contract year under NHS England’s current quality and payment reforms guidance, which took effect for unscheduled and urgent care provisions from 1 April 2026 and for complex care pathways from 23 June 2026. Those reforms changed how certain categories of activity are defined and claimed, but they did not alter the underlying 96% to 102% tolerance mechanism.
The Reconciliation Timetable
UDA delivery is checked against the target at two points in the contract year, run by the NHS Business Services Authority’s Provider Assurance Dental team on behalf of the commissioner:
- Mid-year review, around the 30 September checkpoint, halfway through the financial year. Practices tracking below roughly 30% of their adjusted year-to-date target at this stage are typically required to submit an action plan explaining how they intend to close the gap by year end.
- Year-end reconciliation, after the financial year closes, comparing total delivered UDAs against the annual target (adjusted for any carry-forward from the previous year). This is the point at which the tolerance bands above are applied and, where relevant, clawback is calculated and formally notified to the contractor.
Where UDA Disputes Typically Arise
Disagreements between a contractor and the commissioner over UDA figures tend to fall into a handful of recurring categories:
- Claim coding disputes. Whether a particular course of treatment was correctly banded, particularly around the Band 2 sub-bands, can materially affect the UDA total claimed. Systematic under-coding or over-coding, whether accidental or the result of a data submission error, can distort the year-end figure in either direction.
- Carry-forward calculation errors. Where a practice has under or overdelivered in a previous year, that figure is meant to be factored into the current year’s adjusted target. Disputes arise where the commissioner’s figures do not match the practice’s own records of what was agreed and carried forward.
- Disputes over exceptional circumstances. The Policy Book for Primary Dental Services allows commissioners discretion to treat shortfalls caused by genuinely exceptional circumstances, such as a long-term staff absence or a premises issue outside the practice’s control, differently from ordinary underperformance. Whether a given set of facts qualifies is frequently contested, and the practice carries the burden of making the case with proper evidence.
- Ownership change disputes. Where a contract has changed hands during the year, whether via the partnership route or otherwise, disagreements can arise over which party is responsible for a shortfall relating to the period before or after the change, particularly where the sale agreement did not deal with this expressly.
- Disputes over the reconciliation deadline itself. NHS England’s process sets fixed windows for the contractor to respond to a mid-year or year-end notification and for any dispute to be resolved before a breach notice is issued. Missing these windows, even where the underlying figures are genuinely disputable, can significantly weaken a practice’s negotiating position.
What This Means for You
The UDA system is the mechanism that determines how much an NHS dental contract is actually worth, and how exposed a practice is to financial recovery if delivery falls short. Whether you are managing an existing contract’s performance, negotiating a dispute with the commissioner over a reconciliation figure, or assessing a practice’s UDA track record before buying it, the detail in the contract documentation, not general assumptions about “the UDA rate” or “the target”, is what actually governs the position.
If your practice is facing a UDA dispute, a clawback notice, or you want a specific NHS dental contract reviewed as part of a purchase, arrange a consultation with our healthcare team or call us on +44 207 566 1188. You can also reach us at info@gurvelegal.com.
