Maryland operates one of the most complex Medicaid managed care markets in the nation with nine MCOs under its HealthChoice program, combined with the nation’s only all-payer hospital rate-setting system — creating a unique enrollment environment where hospital and institutional provider reimbursement operates fundamentally differently than any other state.
What Is the Maryland MMIS II Portal?
Maryland’s Medicaid Management Information System II (MMIS II) is the centralized provider enrollment portal for all Maryland Medicaid (Medical Assistance) applications. All enrollments, revalidations, and demographic changes flow through MMIS II.
Step-by-Step Maryland Medicaid Enrollment
Maryland enrollment requires MMIS II registration followed by credentialing with HealthChoice MCOs — potentially up to nine separate applications.
Register on MMIS II
Create an account with your NPI, Tax ID, and Maryland practice information.
Complete Enrollment Application
Enter demographics, Maryland license, specialties, practice locations, ownership disclosures, and billing configuration.
Upload Required Documents
Upload MD license, NPI, W-9, EIN, liability insurance, DEA, voided check, and ownership disclosures.
Complete Screening
Maryland conducts OIG/SAM checks, licensing verification, criminal background screening for high-risk categories.
Submit and Await Approval
Processing: 30–45 days.
Credential with HealthChoice MCOs
After MMIS II approval, credential with the HealthChoice MCOs serving your area. Maryland has nine MCOs — prioritize based on market share in your county.
HealthChoice: The Nine-MCO Landscape
Maryland HealthChoice is one of the most competitive MCO markets in the nation with nine contracted managed care organizations.
| MCO | Parent | Coverage |
|---|---|---|
| CareFirst Community Health Plan | CareFirst BCBS | Statewide; dominant in central MD |
| Jai Medical Systems | Local | Baltimore metro |
| Kaiser Permanente | Kaiser | Central Maryland/DC suburbs |
| Maryland Physicians Care | Centene/UMMS | Statewide |
| MedStar Family Choice | MedStar Health | DC suburbs/Southern MD |
| Molina Healthcare | Molina | Statewide |
| Priority Partners | Johns Hopkins | Baltimore/Central MD |
| UnitedHealthcare | UnitedHealth | Statewide |
| Aetna Better Health | CVS Health | Statewide |
With nine MCOs, Maryland requires a strategic approach. Credentialing with all nine is impractical for most practices. Focus on the MCOs with the highest market share in your specific county.
✔ Strategy: In Baltimore, prioritize Priority Partners (Johns Hopkins), CareFirst, and Maryland Physicians Care. In DC suburbs, prioritize CareFirst, MedStar, and Kaiser. Check county-level enrollment data to identify the top 3–5 MCOs in your area.
Maryland’s All-Payer Hospital Rate-Setting System
Maryland is the only state in the nation with an all-payer hospital rate-setting system, where the Health Services Cost Review Commission (HSCRC) sets hospital rates that apply to all payers — including Medicaid.
Impact for hospital and institutional providers:
- Hospital rates are set by the HSCRC, not negotiated with individual MCOs
- This means Medicaid hospital reimbursement in Maryland is significantly higher than most states
- MCO credentialing for hospitals is still required but rates are standardized
- Non-hospital providers (physicians, group practices) negotiate rates with MCOs normally
⚠ Rate Nuance: While Maryland’s all-payer system benefits hospitals, physician and professional services are NOT covered by HSCRC rate-setting. Professional providers negotiate rates individually with each of the nine MCOs, making multi-MCO credentialing strategically important for rate optimization.
Frequently Asked Questions
How long does Maryland Medicaid enrollment take?
MMIS II: 30–45 days. MCO credentialing: 30–60 days per plan. With 9 MCOs, prioritize 3–5 highest-share plans. Total: 60–105 days.
Do I need to credential with all nine MCOs?
No. Focus on the 3–5 MCOs with highest market share in your county. Credentialing with all nine is impractical for most practices.
What is the all-payer rate-setting system?
Maryland’s HSCRC sets standardized hospital rates across all payers including Medicaid. This only applies to hospital/institutional services, not physician professional fees.
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