Good morning – you can do either within the same TIN or in a separate TIN. A separate TIN allows billing for both the ED E&M and the Obs charges. Same TIN, one or the other, not both. A separate TIN is ideal if there is enough volume to support an additional care team, but still may require hospital support for sustainability. If in a separate TIN, some scheduling mechanics have to be set up to ensure a physician that sees a patient in the ED, they are not the following Obs provider. We’ve worked under the separate TIN structure for Obs for >15 years without any issues.