Concept Architecture
Concept
Theoretically, Top-Down Costing is a costing methodology that estimates the cost of healthcare services by allocating aggregated expenditure from organisational or departmental accounts to individual services, patients or interventions using allocation rules. It is based on cost accounting theory and exists to estimate unit costs when detailed resource utilisation data are unavailable. In health economics, top-down costing is widely used in hospital costing studies, cost-of-illness analyses and economic evaluations using routinely collected financial data.
Mathematically, Top-Down Costing allocates total expenditure to cost objects using allocation factors such as patient days, admissions, outpatient visits or relative resource use. The resulting average cost estimates represent the distribution of aggregate expenditure across healthcare activities rather than direct measurement of individual resource consumption.
In practice, Top-Down Costing is implemented by identifying total organisational expenditures, assigning indirect costs to clinical departments, selecting appropriate allocation bases and calculating average unit costs. It is commonly used when administrative financial data are available but patient-level resource measurement is impractical.
Purpose
Used to estimate healthcare costs by allocating aggregate expenditure to services, departments or patients using predefined allocation rules when detailed resource-use data are unavailable.
Mathematical Formulae
Primary Formula
Unit Cost = Total Allocated Cost / Total Units of Activity
where:
- Total Allocated Cost = aggregate expenditure assigned to the service
- Total Units of Activity = patient days, admissions, visits or other activity measure
Supporting Formulae
Allocated departmental cost:
Allocated Cost? = Total Cost ? (Allocation Base? / ????� Allocation Base?)
Related Mathematical Methods
- Step-Down Allocation
- Common Cost Allocation
- Activity-Based Costing
- Time-Driven Activity-Based Costing
- Micro-Costing
Example
A hospital department incurs annual expenditure of �4,500,000 and treats 9,000 inpatient episodes during the year.
Unit Cost = 4,500,000 / 9,000 = �500
The estimated average inpatient cost using top-down costing is �500 per admission.
Excel Implementation
| Function | Example Formula | Health Economics Application |
|---|---|---|
| Division | =B2/C2 | Calculates average unit cost from total expenditure and activity volume |
| SUM | =SUM(B2:B20) | Calculates total departmental expenditure |
| SUMPRODUCT | =SUMPRODUCT(B2:B10,C2:C10) | Allocates aggregate costs using weighted allocation factors |
| ROUND | =ROUND(D2,2) | Formats calculated unit costs for reporting |
VBA (Optional)
Automate allocation of organisational expenditure to healthcare services and generate unit cost reports using predefined allocation bases.
Sources
- Drummond MF, Sculpher MJ, Claxton K, Stoddart GL, Torrance GW. Methods for the Economic Evaluation of Health Care Programmes. Oxford University Press.
- Gold MR, Siegel JE, Russell LB, Weinstein MC. Cost-Effectiveness in Health and Medicine. Oxford University Press.
- Kaplan RS, Atkinson AA. Advanced Management Accounting.
- ISPOR Good Practices for Costing Methodology.
Related Concepts (2)
Library
Publications
3
Methods for the Economic Evaluation of Health Care Programmes — Drummond, Sculpher, Claxton, Stoddart & Torrance, 4th Edition ed., 2015 (Oxford University Press)
The standard international reference text for economic evaluation methods in health care, covering cost-effectiveness, cost-utility and cost-benefit analysis, measurement of costs and outcomes, evidence synthesis, and the characterisation of uncertainty.
BookView source →Economic Analysis in Health Care — Morris, Devlin, Parkin & Spencer, 2nd Edition ed., 2012 (John Wiley & Sons)
A core textbook for advanced undergraduate and postgraduate health economics students, covering both the economics of health care systems and the evaluation of health care technologies, with international case studies and a strong balance of theory and application.
BookView source →Methods for Estimating Avoidable Costs of Excessive Alcohol Consumption — Gavurova B & Tarhanicova M, 18(9):4964 ed., 2021 (International Journal of Environmental Research and Public Health)
Peer-reviewed methods review and application covering top-down and bottom-up estimation of alcohol-related avoidable costs.
Journal ArticleView source →
Frequently Asked Questions (6)
What is top-down costing?
A costing method that starts from total observed expenditure for a programme and divides it by units delivered to produce an average unit cost.
Source: Drummond MF, Sculpher MJ, Claxton K, Stoddart GL, Torrance GW. Methods for the Economic Evaluation of Health Care Programmes. 4th ed. Oxford University Press; 2015.
How does top-down costing derive a unit cost?
Top-down costing begins from a total expenditure figure for a programme or department and divides it by a measure of the units delivered, giving an average cost per unit. The total is taken from financial records, and the unit count from activity data, so the method uses information that is routinely collected rather than requiring the resources for each case to be traced individually. The result describes the average across all units covered by the total, without distinguishing how cost varies between them.
Source: Drummond et al. 2015
When is top-down costing appropriate?
Top-down costing suits situations where an average unit cost is sufficient and where expenditure and activity totals are readily available, such as budgeting, broad comparison between services, or costing a resource used fairly uniformly across cases. It is quicker and less demanding than tracing resources case by case. It is less suitable where cost varies substantially between individual units, since an average conceals that variation, or where the cost of a specific pathway rather than the service as a whole is required.
Source: Drummond et al. 2015
How does top-down costing differ from bottom-up costing?
Top-down costing starts from an aggregate total and divides down to an average, whereas bottom-up costing starts from the individual resources a case consumes and builds up to its cost. The top-down approach is faster and uses existing financial totals but yields only an average, while the bottom-up approach is more demanding yet captures how cost differs between cases. The choice turns on whether an average suffices and on whether the detail needed to identify individual resource use is available.
Source: Drummond et al. 2015
What are the limitations of top-down costing?
Because it distributes a total across units, top-down costing produces an average that hides variation between cases, so a complex case and a simple one are assigned the same figure. Its accuracy depends on how well the unit count matches the activity the total actually covers, and on whether the expenditure figure includes all and only the relevant costs. Where the total mixes several services, the resulting average may not represent any of them well. It is therefore ill suited to questions about cost differences within a service.
Source: Drummond et al. 2015
How are top-down costs used in economic evaluation?
Top-down average unit costs are widely used to value resource use in economic evaluation, since published schedules of such costs allow quantities of activity to be priced without bespoke costing. They suit resources used similarly across patients and analyses where the average adequately represents the cost. Where a study turns on differences between patients or on a specific pathway, analysts supplement or replace top-down figures with more detailed costing for the components on which the conclusion depends.
Source: Drummond et al. 2015
Trust Record
Verified by Dr Darrin Baines
British health economist
Professional identity: darrinbaines.org
Verification date: 8 Aug 2025
Content version: 1.0.0
Canonical Identity
- Persistent URI
- https://healtheconomics.wiki/concept/top-down-costing
- Term code
- HE-EE-CM-019
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