Concept Architecture
Concept
Theoretically, Complaint Rate is a healthcare quality indicator that quantifies the frequency of formal complaints submitted by patients, families or service users relative to a defined volume of healthcare activity. It is a measure of patient experience and organisational performance, founded on descriptive epidemiology and quality measurement. The concept exists to standardise complaint reporting across healthcare providers, enabling comparisons over time and between organisations while accounting for differences in service volume.
Mathematically, the Complaint Rate is represented as the ratio of the number of complaints to an appropriate denominator, such as patient encounters, admissions, discharges or occupied bed-days, multiplied by a standard scaling factor. The denominator selected depends on the healthcare setting and reporting framework, allowing meaningful comparison across providers of different sizes.
In practice, Complaint Rates are calculated using routinely collected organisational data from patient relations systems and healthcare activity records. Rates are monitored longitudinally, benchmarked internally or externally and analysed alongside other quality indicators to identify areas requiring service improvement. In health economics, Complaint Rates may be incorporated into evaluations of healthcare quality improvement initiatives and organisational performance.
Purpose
Used to monitor patient experience, evaluate healthcare quality, benchmark organisational performance, identify opportunities for service improvement and assess the impact of quality improvement interventions.
Mathematical Formulae
Primary Formula
Complaint Rate = (Number of Complaints � Number of Patient Encounters) ? k
where k is a reporting constant (commonly 100, 1,000 or 10,000).
Supporting Formulae
Complaint Rate per 1,000 Admissions = (Number of Complaints � Number of Admissions) ? 1,000
Complaint Percentage = (Number of Complaints � Number of Patient Encounters) ? 100
Related Mathematical Methods
- Incidence proportion
- Rate standardisation
- Descriptive statistics
- Time series analysis
- Statistical process control
- Benchmarking analysis
Example
A hospital receives 52 formal complaints during a year in which 26,000 patients are admitted.
Complaint Rate = (52 � 26,000) ? 1,000
= 2.0 complaints per 1,000 admissions
The organisation therefore reports a Complaint Rate of 2.0 complaints per 1,000 admissions, allowing comparison with previous years and peer institutions.
Excel Implementation
| Function | Example Formula | Health Economics Application |
|---|---|---|
| COUNT | =COUNT(B2:B53) | Count the number of recorded complaints. |
| COUNTA | =COUNTA(C2:C26001) | Count total patient encounters or admissions. |
| COUNT/COUNTA | =(COUNT(B2:B53)/COUNTA(C2:C26001))*1000 | Calculate the Complaint Rate per 1,000 encounters. |
| AVERAGE | =AVERAGE(D2:D13) | Calculate the average monthly Complaint Rate. |
| IF | =IF(E2>2,"Above Target","Within Target") | Compare Complaint Rates with organisational quality targets. |
VBA (Optional)
Automate calculation of Complaint Rates by clinical service, reporting period and complaint category while producing quality monitoring dashboards.
Sources
- Agency for Healthcare Research and Quality. Patient Safety Indicators.
- World Health Organization. Quality of Care: A Process for Making Strategic Choices in Health Systems.
- NICE. Health Service Quality Standards.
- OECD. Health Care Quality Indicators Project.
- Drummond MF, Sculpher MJ, Claxton K, Stoddart GL, Torrance GW. Methods for the Economic Evaluation of Health Care Programmes.
- Briggs A, Claxton K, Sculpher M. Decision Modelling for Health Economic Evaluation.
Related Concepts (2)
Frequently Asked Questions (6)
What is the complaint rate?
A measure of how frequently patients or families formally express dissatisfaction with the care or service received within an organisation.
Source: Cutler DM, Zeckhauser RJ. The anatomy of health insurance. In: Culyer AJ, Newhouse JP, eds. Handbook of Health Economics. Vol 1A. Elsevier; 2000:563-643. doi:10.1016/S1574-0064(00)80170-5.
What does the complaint rate measure?
The complaint rate measures how frequently patients or families formally express dissatisfaction with the care or service received within an organisation, so it tracks the frequency of formal expressions of dissatisfaction. This measurement of complaint frequency defines it. So the complaint rate is a measure of how frequently patients or families formally express dissatisfaction with the care or service received within an organisation This source in patients and families is what the complaint rate draws on to gauge dissatisfaction.
Source: Cutler & Zeckhauser 2000
Who expresses dissatisfaction counted in the complaint rate?
The complaint rate counts dissatisfaction expressed by patients or families, so it captures formal expressions of dissatisfaction from these groups about the care or service received within an organisation. This source of complaints defines part of the measure. So the complaint rate measures how frequently patients or families formally express dissatisfaction with the care or service received within an organisation This scope covering care and service is what gives the complaint rate its breadth as a measure.
Source: Cutler & Zeckhauser 2000
What does the complaint rate track dissatisfaction with?
The complaint rate tracks dissatisfaction with the care or service received, so it measures how often patients or families formally raise concerns about either the clinical care or the service around it within an organisation. This scope covering care and service defines it. So the complaint rate tracks how frequently patients or families formally express dissatisfaction with the care or service received within an organisation This focus on formal complaints is what distinguishes the measure from passing or informal expressions of dissatisfaction.
Source: Cutler & Zeckhauser 2000
What kind of expression does the complaint rate count?
The complaint rate counts formal expressions of dissatisfaction, so it measures dissatisfaction that patients or families put forward formally rather than in passing, about the care or service received within an organisation. This focus on formal complaints defines it. So the complaint rate counts formal expressions of dissatisfaction with the care or service received, measuring how frequently patients or families raise them within an organisation This grounding in formal expressions is central to what the complaint rate is designed to capture.
Source: Cutler & Zeckhauser 2000
How does the complaint rate relate to the grievance rate?
The complaint rate relates to the grievance rate as a less formal counterpart: the complaint rate measures how frequently patients or families formally express dissatisfaction, while the grievance rate measures how frequently they file a formal grievance, distinguished from a less formal complaint. So the complaint and grievance rates track dissatisfaction at different levels of formality, connected as related measures of patient and family concerns This difference in formality is what separates the complaint rate from the grievance rate.
Source: Cutler & Zeckhauser 2000
Trust Record
Verified by Dr Darrin Baines
British health economist
Professional identity: darrinbaines.org
Verification date: 26 Feb 2026
Content version: 1.0.0
Canonical Identity
- Persistent URI
- https://healtheconomics.wiki/concept/complaint-rate
- Term code
- HS-HP-HQ-009
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