11 - Office

12 - Home

21 - Inpatient Hospital

22 - Outpatient Hospital

23 - Emergency Room (Hospital)

24 - Ambulatory Surgery Clinic

25 - Birthing Center

31 - Skilled Nursing Facility (SNF)

32 - Nursing Facility (NF)

41 - Ambulance (Land)

42 - Ambulance (Air or Water)

53 - Community Mental Health Center

54 - Intermediate Care Facility – Mentally Retarded

55 - Residential Substance Abuse Treatment Facility

62 -Comprehensive Outpatient Rehabilitation Facility

65 - End Stage Renal Disease Treatment Facility

71 - State or Local Public Health Clinic

72 - Rural Health Clinic

81 - Independent Laboratory

99 - Other (if subacute care, use modifier HB to indicate adult or modifier HA to indicate child)