What is the Gera Chronic Disease Burden Index (GCDBI)?

The GCDBI is a 0–100 index that summarises an ICB's overall chronic-disease burden from real NHS QOF prevalence data. For each ICB it sums the ratio of the area's prevalence to the England rate across six conditions (diabetes, hypertension, coronary heart disease, dementia, asthma and depression), then maps the median ICB to 50. A higher score means greater population-weighted chronic-disease burden. The England reference equates to 45.3.

Where does this disease prevalence data come from?

From NHS England's Quality and Outcomes Framework (QOF) 2024/25 publication — the annual dataset of recorded disease prevalence on every GP practice register in England. Gera aggregates the practice-level prevalence to all 42 Integrated Care Boards. It is open data under the Open Government Licence v3.0.

Which conditions are covered?

Six high-priority conditions: diabetes, hypertension, coronary heart disease, dementia, asthma and depression. Each has a national hub page and a page for every one of the 42 English ICBs, with the real recorded prevalence and how it compares to the England average.

Is QOF prevalence the same as the true number of people with a condition?

Not exactly. QOF prevalence counts patients with a recorded diagnosis on GP registers, so it can understate conditions that are under-diagnosed and varies with how completely practices code diagnoses. It is, however, the most complete and consistent national source for comparing recorded chronic-disease prevalence between areas.

Disease Prevalence by ICB — NHS QOF Data

Real NHS England Quality and Outcomes Framework (QOF) 2024/25 recorded prevalence of six chronic conditions across all 42 English Integrated Care Boards — plus the Gera Chronic Disease Burden Index.

What is the recorded prevalence of chronic diseases across England by area (ICB)?

According to NHS England's QOF 2024/25 data, 15.23% of eligible patients on English GP registers have recorded hypertension, 14.27% depression and 7.89% diabetes. Gera publishes the figure for all six priority conditions across the 42 English ICBs, re-dated each annual QOF release.

Source:NHS England (NHS Digital) — Quality and Outcomes Framework (QOF) prevalence·as of 2024/25updated annually (last: 18 June 2026)

Gera Chronic Disease Burden IndexEngland ref 45.3 / 100Per-ICB index (0–100) combines real QOF prevalence across all six conditions, each relative to the England rate. The median ICB scores 50; higher = greater chronic-disease burden.How this index is calculated

England recorded prevalence by condition — QOF 2024/25 (NHS England, OGL v3.0)
Condition	England prevalence	Patients on register
Diabetes	7.89%	4,109,134
Hypertension	15.23%	9,711,491
Coronary heart disease	2.98%	1,899,633
Dementia	0.78%	498,887
Asthma	6.56%	3,944,639
Depression	14.27%	7,317,368

Check disease prevalence in your area

Pick a condition and your Integrated Care Board to see its real recorded prevalence vs the England average.

ConditionYour area (Integrated Care Board)

Pick a condition and your Integrated Care Board to see your area's real recorded prevalence, how it compares to the England average, its rank among the 42 English ICBs, and the Gera Chronic Disease Burden Index.

Conditions

ICBs with the highest chronic-disease burden (2024/25)

Highest Gera Chronic Disease Burden Index, ICBs ranked
Integrated Care Board	GCDBI	Diabetes	Hypertension
Lincolnshire	78.5 / 100	8.8%	19.0%
Cornwall and the Isles of Scilly	76.9 / 100	7.6%	18.1%
Somerset	74.7 / 100	8.2%	18.7%
Norfolk and Waveney	74.6 / 100	9.0%	18.1%
North East and North Cumbria	71.9 / 100	8.9%	17.9%
Lancashire and South Cumbria	71.1 / 100	8.2%	17.2%
Dorset	70.1 / 100	7.5%	17.4%
Devon	69.2 / 100	7.6%	17.6%
Staffordshire and Stoke-on-Trent	69.2 / 100	8.7%	17.8%
Shropshire, Telford and Wrekin	67.8 / 100	8.1%	17.7%

See how the Gera Chronic Disease Burden Index is calculated.

Related NHS data on GeraClinic

NHS disease prevalence data: frequently asked questions

What is the Gera Chronic Disease Burden Index (GCDBI)?: The GCDBI is a 0–100 index that summarises an ICB's overall chronic-disease burden from real NHS QOF prevalence data. For each ICB it sums the ratio of the area's prevalence to the England rate across six conditions (diabetes, hypertension, coronary heart disease, dementia, asthma and depression), then maps the median ICB to 50. A higher score means greater population-weighted chronic-disease burden. The England reference equates to 45.3.
Where does this disease prevalence data come from?: From NHS England's Quality and Outcomes Framework (QOF) 2024/25 publication — the annual dataset of recorded disease prevalence on every GP practice register in England. Gera aggregates the practice-level prevalence to all 42 Integrated Care Boards. It is open data under the Open Government Licence v3.0.
Which conditions are covered?: Six high-priority conditions: diabetes, hypertension, coronary heart disease, dementia, asthma and depression. Each has a national hub page and a page for every one of the 42 English ICBs, with the real recorded prevalence and how it compares to the England average.
Is QOF prevalence the same as the true number of people with a condition?: Not exactly. QOF prevalence counts patients with a recorded diagnosis on GP registers, so it can understate conditions that are under-diagnosed and varies with how completely practices code diagnoses. It is, however, the most complete and consistent national source for comparing recorded chronic-disease prevalence between areas.

Worried about a chronic condition?

Recorded prevalence is an area-level statistic, not a personal risk score. A GeraClinic UK-registered clinician can assess your individual risk and arrange tests or referrals — often the same day.

See a GeraClinic doctor How GeraClinic works

Contains public sector information published by NHS England and licensed under the Open Government Licence v3.0. Source: NHS England (NHS Digital) — Quality and Outcomes Framework (QOF) prevalence (2024/25, published 28 August 2025).