Delaware operates a fully managed Medicaid system with three MCOs, and high-risk provider types face a strict sequential dependency: Medicare enrollment must be completed through PECOS before DMAP enrollment can begin.
What Is DMAP?
The Delaware Medical Assistance Program (DMAP) is the state’s Medicaid enrollment and management system for all provider types. All initial enrollments, re-enrollments, and revalidations must be processed through DMAP.
Step-by-Step Delaware Medicaid Enrollment
Delaware enrollment requires sequential planning: high-risk providers must complete Medicare enrollment first, then DMAP, then MCO credentialing.
Complete Medicare Enrollment First (High-Risk Providers)
If you are classified as a high-risk provider type: You must successfully enroll in Medicare through PECOS before starting your DMAP application. DMAP cross-references your Medicare status — applications without active Medicare enrollment are automatically rejected. This adds the $730 Medicare fee and 30–90 days of processing time.
Register with DMAP
Submit your DMAP enrollment application with your NPI, Tax ID, and all required documentation. Ensure all data matches your Medicare enrollment records exactly.
Complete Application Sections
Enter demographics, Delaware license information, specialty designations, ownership disclosures, and billing configuration. Ensure your provider type and specialty match your MCO contract intentions.
Upload Required Documents
Upload Delaware state license, NPI confirmation, W-9, IRS EIN documentation, professional liability insurance, DEA (if prescribing), voided check for EFT, and Medicare enrollment confirmation (if applicable).
Sign Provider Agreement and Submit
Sign the Delaware Medicaid provider agreement. Clean applications process in 30–45 days.
Credential with All Three MCOs
After DMAP approval, credential separately with Highmark Health Options, AmeriHealth Caritas Delaware, and Delaware First Health. Credential with all three to maximize patient access.
Delaware’s Three-MCO Landscape
Delaware operates with three competing MCOs, and providers who don’t credential with all three risk losing access to a significant portion of the Medicaid population.
| MCO | Parent Company | Key Details |
|---|---|---|
| Highmark Health Options | Highmark Inc. | Largest market share; strongest in northern Delaware |
| AmeriHealth Caritas Delaware | AmeriHealth Caritas | Strong statewide presence; emphasis on care coordination |
| Delaware First Health | Newest addition | Growing market share; newest entrant expanding member base |
Members choose their MCO at enrollment. Providers credentialed with only one or two MCOs will miss patients assigned to the third plan. The addition of Delaware First Health created a three-way competitive market that requires credentialing with all plans for full population access.
The Medicare Prerequisite: Sequential Dependency
High-risk provider types must complete Medicare enrollment via PECOS before DMAP will accept their Medicaid application.
This sequential dependency means your total Delaware onboarding timeline includes:
- Medicare (PECOS): 30–90 days + $730 application fee
- DMAP enrollment: 30–45 days (cannot start until Medicare is active)
- MCO credentialing: 30–60 days per MCO (can be parallelized after DMAP)
Total worst-case timeline: 90–195 days for high-risk provider types.
⚠ Sequencing Rule: Do not submit a DMAP application until your Medicare enrollment is confirmed active in PECOS. DMAP will reject your application and you will need to resubmit after Medicare approval, adding weeks to your timeline.
Frequently Asked Questions
Do all Delaware providers need Medicare first?
Only high-risk provider categories require Medicare enrollment as a DMAP prerequisite. Verify your risk classification with DMAP before starting applications.
How many MCOs does Delaware have?
Three: Highmark Health Options, AmeriHealth Caritas Delaware, and Delaware First Health. Credential with all three for maximum patient access.
How long does Delaware enrollment take?
Low-risk providers: 60–105 days (DMAP + MCO). High-risk providers: 90–195 days (Medicare + DMAP + MCO).
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