New Hampshire's Medicaid dental benefit is split by age, and that is the one thing about this state an office cannot work out by looking at a portal. Adults 21 and over are carved out to Northeast Delta Dental, with DentaQuest in the arrangement; children stay fee-for-service and are handled through the state's own system, nhmmis.nh.gov. Same programme — New Hampshire Smiles — two different places to log in.
A family can need two portals in one afternoon
The practical shape of this is a mother and her fifteen-year-old son on the schedule back to back. The son's eligibility and claim go through the state system. The mother's go to the carved-out adult route. Nothing on either record announces the split, and neither portal tells you that the other one exists.
The age boundary is the usual Medicaid one — 21, not 18 or 19. A patient who turns 21 between the treatment plan and the seat moves from one route to the other, and the estimate you built under the children's route was built in the wrong place. Check the date of birth against the date of service, not against the date you did the verification.
Where a benefit is split like this, "the patient isn't in the system" is almost always the wrong system rather than a lapse in coverage. That is the failure this page exists to prevent.
Where you actually log in
| What | Address | Checked |
|---|---|---|
| Children — fee-for-service, state system | nhmmis.nh.gov | 10 September 2026 |
| Adults 21 and over — Northeast Delta Dental | portal3.nedelta.com | 10 September 2026 |
| Adults 21 and over — DentaQuest | provideraccess.dentaquest.com | 10 September 2026 |
Each hostname was put through a Domain Name System lookup on 10 September 2026 and each returned an address. That is what we verified and all of it. We did not attempt to sign in, and a portal that will not open from a data centre says nothing about whether it opens from a practice — several government portals deliberately refuse traffic that does not look like an ordinary office network.
One address adjacent to this is worth knowing about: nhmmis.com, the obvious .com guess at the state system, returned no address on 10 September 2026 and has no nameservers at all. Nothing sinister — it simply does not exist. But if you have typed it and got a browser error, the error was about the domain you typed, not about the portal being down. The state system is the .nh.gov one.
What to do
- Ask for the date of birth before you decide which portal to open. In New Hampshire that is the routing question, ahead of the plan name.
- Keep the routes bookmarked as "NH children" and "NH adults 21+", so the label carries the rule.
- For a patient close to 21, verify against the date of service. Turning 21 moves them across the split.
- If the adult verification is unclear about which of the two adult addresses to use, ring the plan rather than guessing between them — the two sit in the same arrangement and the patient's own record is what settles it.
- Write "split by age at 21" against New Hampshire in the practice management system. It is the fact people re-derive most often, and the one no portal displays.
The state-by-state directory has the same answer for 48 states and the District of Columbia, each hostname re-checked in DNS on the same date.
Portal addresses and the age split last re-checked 10 September 2026.