Neither, with the addition of 5010, the field was increased from 8 to 12 allow for up to 12, however only first 4 are pointed/used right now.
So there is a maximum of 12 dx codes allowed per claim.
From the AMA Fact sheets
The maximum number of diagnosis codes that can be reported on a claim was increased from
eight to twelve. Although twelve diagnosis codes can be reported at the claim level, only four
codes can be pointed to, or linked to, a specific service at the service line level. So if a patient
has twelve diagnoses and you perform a service that relates to five diagnoses, you can only point
to four of them when billing for that service line.