va health economics course presentation # 3: costing methods april 6, 2006
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VA Health Economics Course VA Health Economics Course Presentation # 3:Presentation # 3:Costing MethodsCosting Methods
April 6, 2006April 6, 2006
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Health Economics Resource CenterHealth Economics Resource Center 22
Costing MethodsCosting Methods
Mark W. Smith, PhDMark W. Smith, PhD
Associate Director Associate Director
VA Health Economics VA Health Economics Resource CenterResource Center
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Health Economics Resource CenterHealth Economics Resource Center 33
Focusing QuestionFocusing Question
What is the cost of a health care intervention?What is the cost of a health care intervention?
ExampleExample
CSP 530 compares dialysis 3x/week to CSP 530 compares dialysis 3x/week to 6x/week for patients with acute renal failure.6x/week for patients with acute renal failure.
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Health Economics Resource CenterHealth Economics Resource Center 44
Cost of Health CareCost of Health Care
Outside of health, most items that we Outside of health, most items that we purchase daily have a readily observable purchase daily have a readily observable costcost
Not true with health careNot true with health care– Insurance buffers patient from true cost Insurance buffers patient from true cost – Charges, payments may not equal costCharges, payments may not equal cost
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Health Economics Resource CenterHealth Economics Resource Center 55
Cost Estimation ApproachesCost Estimation Approaches
Two general approaches to costing:Two general approaches to costing:– MicrocostingMicrocosting
– Average costing (gross costing)Average costing (gross costing)
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Estimating Costs: Micro-costingEstimating Costs: Micro-costing
– Determine each input, find its price, Determine each input, find its price, then sum (quantity*price) across all then sum (quantity*price) across all inputsinputs
– DSS uses this approachDSS uses this approach
– Researchers use this approach in some Researchers use this approach in some circumstancescircumstances
– Gold standard but resource intensiveGold standard but resource intensive
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Estimating Costs: Average CostingEstimating Costs: Average Costing
– Over a long period, divide total cost by Over a long period, divide total cost by total units of care providedtotal units of care provided
– Less precise than micro-costingLess precise than micro-costing
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Costing SpectrumCosting Spectrum
Micro costing and average costing Micro costing and average costing represent ends of a spectrumrepresent ends of a spectrum
Micro costing Average Costing
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Health Economics Resource CenterHealth Economics Resource Center
Costing SpectrumCosting Spectrum
Direct measurem
ent
Pseudo-bill
Reduced list costing
Cost regression
Estimate M
edicare payment
Average cost per day
micro average
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Microcost method 1Microcost method 1
Direct MeasurementDirect Measurement
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Health Economics Resource CenterHealth Economics Resource Center
Direct MeasurementDirect Measurement
Used to the find the cost of: Used to the find the cost of: – interventionsinterventions– care unique to VAcare unique to VA
MethodMethod1.1. Measure staff activityMeasure staff activity2.2. Find labor costFind labor cost3.3. Find cost of supplies, capital, overheadFind cost of supplies, capital, overhead
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Health Economics Resource CenterHealth Economics Resource Center
Finding Unit CostFinding Unit Cost
Average cost Average cost – Total program cost/number of unitsTotal program cost/number of units– Assumes homogeneous productsAssumes homogeneous products
Relative Values needed for heterogeneous Relative Values needed for heterogeneous productsproducts– Find Relative Value of each productFind Relative Value of each product– Find cost per relative value unit (RVU)Find cost per relative value unit (RVU)– Use this to find cost of each productUse this to find cost of each product
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Health Economics Resource CenterHealth Economics Resource Center
Staff Activity AnalysisStaff Activity Analysis
Methods of finding staff activitiesMethods of finding staff activities– Track staff activity in a log Track staff activity in a log – Estimate activityEstimate activity
Need not be comprehensive; can sample Need not be comprehensive; can sample activity activity
Estimate labor costEstimate labor cost
Direct Measurement
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Characterizing Staff ActivitiesCharacterizing Staff Activities
Cost of patient care may include non-patient care timeCost of patient care may include non-patient care time
Activities that produce several products may need to be Activities that produce several products may need to be included, depending on perspectiveincluded, depending on perspective– e.g., time spent on clinical research may be regarded as a e.g., time spent on clinical research may be regarded as a
research cost, or a patient care cost, depending on analytical research cost, or a patient care cost, depending on analytical goal goal
Direct Measurement
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Exclude and IncludeExclude and Include
Exclude development costExclude development cost
Exclude research-related costsExclude research-related costs
Should measure when program fully implementedShould measure when program fully implemented
Should measure at constant returns to scaleShould measure at constant returns to scale
Direct Measurement
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Direct vs. Indirect vs. OverheadDirect vs. Indirect vs. Overhead
Direct costs: costs that are tied to a particular Direct costs: costs that are tied to a particular encounter (e.g., staff time, medications)encounter (e.g., staff time, medications)
Overhead: costs that cannot be tied to particular Overhead: costs that cannot be tied to particular procedures (e.g., VA police, maintenance, food procedures (e.g., VA police, maintenance, food service)service)
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Direct vs. Indirect vs. OverheadDirect vs. Indirect vs. Overhead
Indirect: Indirect:
(a)(a) sometimes means overheadsometimes means overhead
(b)(b) sometimes means non-salary benefits sometimes means non-salary benefits (e.g., health care, annual leave)(e.g., health care, annual leave)
(a)(a) sometimes means secondary impact of sometimes means secondary impact of treatment on other health care usetreatment on other health care use ExampleExample: patient receives better depression care : patient receives better depression care
at VA and later has fewer visits for other at VA and later has fewer visits for other causescauses
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Poll & DiscussionPoll & Discussion
Which of these should be included in the cost of Which of these should be included in the cost of an intervention?an intervention?
Non-salary benefits Non-salary benefits Secondary impact on other health care servicesSecondary impact on other health care services Overhead costsOverhead costs
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Other CostsOther Costs
Survey or actual measure of supply costsSurvey or actual measure of supply costsAlternatives for overheadAlternatives for overhead
– Cost report dataCost report data– Standard ratesStandard rates
Alternatives for capitalAlternatives for capital– Cost reportCost report– Rental ratesRental rates
Direct Measurement
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Microcost method 2Microcost method 2
Pseudo-BillPseudo-Bill
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Pseudo-billPseudo-bill
Itemize all services utilized/providedItemize all services utilized/provided
Use schedule of cost/reimbursement for each serviceUse schedule of cost/reimbursement for each service
Example: HERC outpatient costsExample: HERC outpatient costs– Itemized all CPT codesItemized all CPT codes– Used relative value weights to assign costs to proceduresUsed relative value weights to assign costs to procedures
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Microcost method 3Microcost method 3
Reduced List Costing Reduced List Costing
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Reduced List CostingReduced List Costing
Some utilization items in pseudo-bill explain Some utilization items in pseudo-bill explain most of variation in costmost of variation in cost– e.g., surgical procedurese.g., surgical procedures
Costing major items may be sufficientCosting major items may be sufficient
Schedule of cost/reimbursement must be adjustedSchedule of cost/reimbursement must be adjusted– e.g., new rate for surgical procedures that includes e.g., new rate for surgical procedures that includes
cost of laboratory servicescost of laboratory services
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Microcost method #4: Microcost method #4:
Cost RegressionCost Regression
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Cost RegressionCost Regression
Dependent variable is charges or cost-adjusted Dependent variable is charges or cost-adjusted charge from non-VA datacharge from non-VA data
Independent variables:Independent variables:– Clinical informationClinical information– Diagnosis Related GroupDiagnosis Related Group– DiagnosisDiagnosis– ProceduresProcedures– Vital status at dischargeVital status at discharge– Length of stayLength of stay– Days of ICU careDays of ICU care
Anything that predicts cost and is in both datasets.
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Transformation of Dependent Transformation of Dependent VariableVariable
Cost data are frequently skewedCost data are frequently skewed– Skewed errors violates assumptions of Ordinary Least SquaresSkewed errors violates assumptions of Ordinary Least Squares– Error terms not normally distributed with identical means and Error terms not normally distributed with identical means and
variancevariance– Transformation Transformation
Typical method: log of costTypical method: log of cost Can make OLS assumptions more tenableCan make OLS assumptions more tenable
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References - IReferences - I
Duan, N. (1983) Smearing estimate: a Duan, N. (1983) Smearing estimate: a nonparametric retransformation method, nonparametric retransformation method, Journal of the American Statistical Journal of the American Statistical AssociationAssociation, 78, 605-610., 78, 605-610.
Manning WG, Mullahy J. Estimating log Manning WG, Mullahy J. Estimating log models: to transform or not to transform? models: to transform or not to transform? J Health EconJ Health Econ 2001 Jul;20(4):461-94. 2001 Jul;20(4):461-94.
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References - IIReferences - II
Basu A, Manning WG, Mullahy J. Basu A, Manning WG, Mullahy J. Comparing alternative models: log vs Comparing alternative models: log vs Cox proportional hazard? Cox proportional hazard? Health Health EconomicsEconomics 2004 Aug;13(8):749-65. 2004 Aug;13(8):749-65.
See HERC web site FAQ response: See HERC web site FAQ response: http://www.herc.research.med.va.gov/ http://www.herc.research.med.va.gov/ resources/faq_e02.aspresources/faq_e02.asp
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LimitationsLimitations
Relies on similar cost structures of external and Relies on similar cost structures of external and study (internal) data.study (internal) data.
Reduces the number of outliers.Reduces the number of outliers.
Can create statistical anomalies.Can create statistical anomalies.
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Microcost method # 5: Microcost method # 5:
Estimating Medicare Estimating Medicare reimbursementsreimbursements
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Medicare ReimbursementsMedicare Reimbursements
Part A -- Prospective Payment for Inpatient Part A -- Prospective Payment for Inpatient StaysStays
Part B -- Payment for Physician Services to Part B -- Payment for Physician Services to InpatientsInpatients
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Medicare Inpatient Facility Medicare Inpatient Facility PaymentPayment
DRG-based payments adjusted byDRG-based payments adjusted by– Disproportionate share payments Disproportionate share payments – Indirect medical educationIndirect medical education– Geographic adjustmentsGeographic adjustments
Outlier payments for unusual casesOutlier payments for unusual cases
Direct medical educationDirect medical education
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Medicare PaymentsMedicare Payments
Medicare pays flat rate per DRG, Medicare pays flat rate per DRG, regardless of length of stay (except for regardless of length of stay (except for outliers)outliers)
Cost analysis may wish to capture effect Cost analysis may wish to capture effect of length of stay on costof length of stay on cost
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Medicare Pricer SoftwareMedicare Pricer Software
Computer application for calculating facility Computer application for calculating facility paymentpayment
Requires Requires – 6-digit hospital PPS (identifier)6-digit hospital PPS (identifier)– DRGDRG– Admission and discharge dates (LOS)Admission and discharge dates (LOS)
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Medicare Outpatient PaymentMedicare Outpatient Payment
Payment based on CPT procedure codesPayment based on CPT procedure codes
Provider payment and facility payment (if Provider payment and facility payment (if done in hospital)done in hospital)
See documentation for HERC Outpatient See documentation for HERC Outpatient Average Cost data: Average Cost data: www.herc.research.med.va.gov/ www.herc.research.med.va.gov/ methods_data/va_cost_methods_ac.aspmethods_data/va_cost_methods_ac.asp
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Outpatient Medicare PaymentsOutpatient Medicare Payments
Some CPTs have no APC:Some CPTs have no APC:– Paid on cost pass-through basis Paid on cost pass-through basis – Paid through another APC (e.g., anesthesia)Paid through another APC (e.g., anesthesia)– Paid through a separate cost listPaid through a separate cost list– Multiple CPTs assigned to a single group-Multiple CPTs assigned to a single group-
APCAPC– Some surgery procedures are discountedSome surgery procedures are discounted
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Selecting a MethodSelecting a Method
Data available?Data available?
Method feasible?Method feasible?
Assumptions appropriate?Assumptions appropriate?
Method accurate: Will it capture the effect of the intervention on Method accurate: Will it capture the effect of the intervention on resource use?resource use?
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Direct MeasurementDirect MeasurementAssumptionsAssumptions
– Activity survey and payroll data are representativeActivity survey and payroll data are representative– May assume all utilization uses the same amount of May assume all utilization uses the same amount of
resourcesresources
AdvantagesAdvantages– Useful to determine cost of a program that is unique to VAUseful to determine cost of a program that is unique to VA
Disadvantages Disadvantages – Limited to small number of programsLimited to small number of programs– Can’t find indirect costsCan’t find indirect costs– Can’t find total health care costCan’t find total health care cost
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Pseudo-billPseudo-billAssumptionsAssumptions
– Schedule of charges reflects relative Schedule of charges reflects relative resource useresource use
– Cost-adjusted charges reflect VA costsCost-adjusted charges reflect VA costs
AdvantagesAdvantages– Captures effect of intervention on pattern of Captures effect of intervention on pattern of
care within an encountercare within an encounter
Disadvantages Disadvantages – Expense of obtaining detailed utilization Expense of obtaining detailed utilization
datadata
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Reduced List CostingReduced List CostingAssumptionsAssumptions
– Items on reduced list are sufficient to capture variation in resource useItems on reduced list are sufficient to capture variation in resource use– Cost of items on reduced list is accurateCost of items on reduced list is accurate
AdvantagesAdvantages– Requires less data than pseudo-billRequires less data than pseudo-bill
DisadvantagesDisadvantages– Needs to find data on cost associated with items on reduced listNeeds to find data on cost associated with items on reduced list
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Cost RegressionCost RegressionAssumptionsAssumptions
– Cost-adjusted charges accurately reflect resource useCost-adjusted charges accurately reflect resource use– The relation between cost and utilization is the same in The relation between cost and utilization is the same in
the current study as in the previous studythe current study as in the previous study
Advantages Advantages – Less effort to obtain reduced list of utilization measures Less effort to obtain reduced list of utilization measures
than to prepare pseudo-billthan to prepare pseudo-bill
Disadvantages Disadvantages – Must have detailed data Must have detailed data – Data from prior study may have error or biasData from prior study may have error or bias
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Estimate Medicare paymentsEstimate Medicare paymentsAssumptionsAssumptions
– Medicare payments reflect average cost for a Medicare payments reflect average cost for a population; your sample is generalizablepopulation; your sample is generalizable
– RVU captures effect of intervention on resources RVU captures effect of intervention on resources usedused
Advantage: easy to understandAdvantage: easy to understand
Disadvantages:Disadvantages:– Accuracy limited – VA may have different cost Accuracy limited – VA may have different cost
structures from average non-VA facilitiesstructures from average non-VA facilities– Inpatient: doesn’t reflect variation in resources Inpatient: doesn’t reflect variation in resources
beyond DRG (or LOS) beyond DRG (or LOS)
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Combining MethodsCombining Methods
No single method may fill all needs, even within a single studyNo single method may fill all needs, even within a single study
Hybrid method may be bestHybrid method may be best– Direct method or pseudo-bill on utilization most affected by Direct method or pseudo-bill on utilization most affected by
interventionintervention– Cost regression or Medicare payment for other utilizationCost regression or Medicare payment for other utilization
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Whiteboard Exercise / DiscussionWhiteboard Exercise / Discussion
CSP 530 compares dialysis 3x/week to CSP 530 compares dialysis 3x/week to 6x/week for patients with acute renal failure.6x/week for patients with acute renal failure.
What are some costs that you could estimate by What are some costs that you could estimate by an average-costing approach?an average-costing approach?
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ReferenceReference
Barnett PG. Determination of VA health care Barnett PG. Determination of VA health care costs. costs. Medical Care Research and Review Medical Care Research and Review 2003;60(3 Suppl.):124S-141S.2003;60(3 Suppl.):124S-141S.
www.herc.research.med.va.gov/www.herc.research.med.va.gov/
publications/supplement_mcrr_2003.asppublications/supplement_mcrr_2003.asp
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Other ResourcesOther Resources
HERC web site: FAQ responses, technical HERC web site: FAQ responses, technical reports (click on Publications tab)reports (click on Publications tab)
HERC Help Desk HERC Help Desk ([email protected])([email protected])
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HERC email listHERC email list
To join the HERC email list, send a request To join the HERC email list, send a request to to [email protected]@va.gov..
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Next sessionNext session
Thursday, 4/16/2006, 2 p.m. ETThursday, 4/16/2006, 2 p.m. ET
Estimating the Cost of Health Care: VA CostsEstimating the Cost of Health Care: VA Costs
Todd Wagner, PhDTodd Wagner, PhD
Reading for next session:Reading for next session:
M Gold et al. Cost-Effectiveness in Health and Medicine
pp. 199-210. Available for purchase at http://www.oup.com/us/ or http://www.amazon.com
PG Barnett. Medical Care Research and Review 60(3), pp. 124S-141S. Download from http://www.herc.research.med.va.gov/ publications/supplement_mcrr_2003.asp