This code system http://hl7.org/fhir/v2/0742 defines the following codes:

CodeDisplay
00Effective weight calculated
01Hospital specific contract
03Eeffective weight for transfer/referral calculated
04Referral from other hospital based on a cooperation (no DRG reimbursement)
05Invalid length of stay
10No information/entry in cost data for this DRG
11No relative weight found for department (type)