Exhibit 21

Subsidiaries of Registrant

US Subsidiaries*

1 BFI Medical Waste, Inc. (Delaware)

2 Healthcare Waste Solutions, Inc. (Delaware)

3 MedServe, Inc. (Delaware)

4 MedSolutions, Inc. (Texas)

5 Notify, MD, Inc. (Delaware)

6 Stericycle International, LLC (Delaware)

7 Stericycle Management, LLC (Delaware)

8 Stericycle of Puerto Rico, Inc. (Puerto Rico)

9 Stericycle Specialty Waste Solutions, Inc. (Delaware)

10 The MPB Group LLC (Delaware)

Non-US Subsidiaries*

1 Habitat Ecologico S. A. (Argentina)

2 Medam Srl (Mexico)

3 SRCL Ireland Limited fka Stericycle Ireland Ltd. (Ireland)

4 Stericare Romania (Romania)

5 Stericycle Brazil, Ltd. (Brazil)

6 Stericycle Co Ltd. (Japan)

7 Stericycle Chile SA (Chile)

8 Stericycle Espana Srl (Spain)

9 Stericycle Europe Sarl (Luxembourg)

10 Stericycle International Holdings Ltd (UK)

11 Stericycle International Ltd. (UK)

12 Stericycle Portugal (Portugal)

13 Stericycle ULC CANADA (Canada)

14 SteriLux International Sarl (Luxembourg)

* states or jurisdictions of incorporation or formation are given in parentheses