Table 6.

Estimation of Eq 1 by Year and Payer Class: Y = MS-DRG weight in the current year.

2008	Medicare	Medicaid	Private
2007 weights	0.937***	0.915***	0.845***
	(0.00279)	(0.00424)	(0.00477)
Difference in weight between DRGs w/o CC and with CC	0.0260***	0.0272***	0.0371***
	(0.000901)	(0.00254)	(0.00305)
Difference in weight between DRGs with CC and with MCC	0.135***	0.130***	0.134***
	(0.00447)	(0.00512)	(0.00469)
Observations	1349113	212371	669659
2009	Medicare	Medicaid	Private
2007 weights	0.932***	0.903***	0.850***
	(0.00272)	(0.00488)	(0.00423)
Difference in weight between DRGs w/o CC and with CC	0.0246***	0.0287***	0.0416***
	(0.000772)	(0.00189)	(0.00185)
Difference in weight between DRGs with CC and with MCC	0.124***	0.119***	0.108***
	(0.00380)	(0.00449)	(0.00299)
Observations	1345626	231847	634182
2010	Medicare	Medicaid	Private
2007 weights	0.932***	0.900***	0.844***
	(0.00292)	(0.00765)	(0.00542)
Difference in weight between DRGs w/o CC and with CC	0.0249***	0.0285***	0.0425***
	(0.000794)	(0.00183)	(0.00198)
Difference in weight between DRGs with CC and with MCC	0.117***	0.117***	0.112***
	(0.00319)	(0.00487)	(0.00359)
Observations	1424377	268965	658716

Notes: All models control for age, race, and gender. CC refers to complications and comorbidities, MCC refers to major complications and comorbidities. We base these classifications for payer class on the variable PAY1 from the HCUP data. Standard errors are in parentheses and clustered at the hospital level.

^*p<0.05

^**p<0.01

^***p<0.001.