Send Delta Dental of Delaware claims electronically with payer ID 51022, or mail group plan claims to Delta Dental of Delaware, P.O. Box 2105, Mechanicsburg, PA 17055-6999. For claims questions, Delta Dental lists 800-932-0783. Remember the Delta rule: bill the company on the patient's card, not the one in your state.
Last updated November 2026 · Reviewed by the PracticeAlpha billing team · Source: Delta Dental's national claims lookup
Get a free AR analysisFrom Delta Dental's national claims lookup. Confirm on the patient's card that the plan is with Delta Dental of Delaware before you submit.
| Detail | Delta Dental of Delaware |
|---|---|
| Claims mailing address (group plans) | Delta Dental of Delaware, P.O. Box 2105, Mechanicsburg, PA 17055-6999 |
| Electronic payer ID | 51022 |
| Phone for claims questions | 800-932-0783 |
| Which Delta company to bill | The Delta company that insures the patient, shown on the ID card, not the Delta company in your state |
| Timely filing | Set by the patient's plan; check the plan details in the Delta portal |
| Shares this claims address with | Delta Dental of New York, Delta Dental of Pennsylvania, Delta Dental of West Virginia and Delta Dental of the District of Columbia |
Enter the date of service to see the filing deadline and how many days are left. Delta Dental of Delaware does not publish one limit for every plan.
Limits are the ones Delta Dental of Delaware publishes, as summarized on this page; the patient's own plan documents win if they differ. Corrected claims and appeals have their own deadlines (see below).
Have claims close to the limit? Free AR analysisSend us your aging list. We will tell you which Delta Dental of Delaware claims are still recoverable, what is holding each one up, and what a fix is worth. Free, no obligation.
Get a free AR analysisWe handle Delta Dental of Delaware provider credentialing and enrollment for dental practices and new associates, from the application to the effective date, so claims stop coming back out of network.
Delta Dental of Delaware credentialing →Send Delta Dental of Delaware claims electronically with payer ID 51022. Paper claims for group plans go to Delta Dental of Delaware, P.O. Box 2105, Mechanicsburg, PA 17055-6999. The phone number Delta Dental lists for Delta Dental of Delaware claims questions is 800-932-0783.
Delta Dental's rule is that a claim goes to the Delta company that provides the patient's coverage, not to the Delta company where your office is. A patient who works for a company headquartered elsewhere can carry a Delta Dental of Delaware card while living in another state, and the reverse is just as common. Read the company name on the ID card, or look the patient up under My Patients in the National Dentist Dashboard, before you submit.
Your participation is honored nationally: if you are a Delta Dental PPO or Premier dentist with your own state's Delta company, you are treated as in network for Delta Dental of Delaware patients too, at the applicable fee schedule.
Delta Dental of Delaware claims are mailed to Mechanicsburg, PA, not to an address in Delaware. That is normal inside the Delta Dental system, where several member companies share claims processing. The same P.O. box is used by Delta Dental of New York, Delta Dental of Pennsylvania, Delta Dental of West Virginia and Delta Dental of the District of Columbia, so a claim mailed there still needs the right company name and payer ID to land with Delta Dental of Delaware. Sending a claim to an in-state Delta office instead of the processing address only slows it down.
Most Delta Dental claims that come back unpaid were sent to the wrong member company, sent under the wrong payer ID, or hit a frequency limit nobody checked. Verify the company, plan type (PPO, Premier, DHMO or individual) and frequencies before the visit. The Delta Dental claims guide covers national rules, and our verification service does this for every patient.
Delta Dental lists payer ID 51022 for Delta Dental of Delaware group plans.
Delta Dental of Delaware, P.O. Box 2105, Mechanicsburg, PA 17055-6999.
Delta Dental lists 800-932-0783 for Delta Dental of Delaware claims questions.
To the Delta company that insures the patient. If the card says Delta Dental of Delaware, file with Delta Dental of Delaware wherever your office is.
Delta Dental member companies share claims processing. Delta Dental of Delaware claims go to Mechanicsburg, PA, the same address used by Delta Dental of New York, Delta Dental of Pennsylvania, Delta Dental of West Virginia and Delta Dental of the District of Columbia.
It is set by the patient's Delta Dental of Delaware plan. Check the plan details in the Delta portal and file as soon as possible.