• A person who has been treated as an outpatient and has one of the following principal ICD-9 procedure codes: 00.50 through 86.99 (excluding 17.70) or 98.51. Please note: that patients with these procedures are included irrespective of where in the hospital procedure was performed (e.g., Ambulatory Surgery, ER, etc.).


• If the principal ICD-9 procedure code is blank or not one of the codes above, then secondary ICD-9 procedures are searched as well as CPT-4 codes equivalent to this range.


• A person who is admitted for observation regardless of the procedure performed.
• Ancillary services are not included in the MODB. Ancillary is defined as diagnostic or therapeutic services, such as laboratory, pharmacy, and physical therapy performed by non-nursing departments.

It is recommended that hospitals send all outpatient records and MHA will filter out the appropriate records and MHA will filter out the appropriate records for inclusion in the MODB. If a hospital does decide to apply its own filter please contact MHA to discuss the filter criteria. A caveat, however: the filter criteria are subject to change. If the criteria change, those hospitals applying their own filters will need to update the filters in their program.

• For a complete listing of participating hospitals, email idssupport@mha.org