Georgia Medicaid operates through Care Management Organizations (CMOs) that auto-assign members who don’t choose a plan within 30 days — meaning providers who aren’t credentialed with all three CMOs risk losing patients to plans they can’t bill.
What Is GAMMIS?
GAMMIS (Georgia Medicaid Management Information System) is the centralized portal for all Georgia Medicaid provider enrollment, management, and claims processing. All provider types must complete GAMMIS enrollment before credentialing with Georgia’s CMOs.
Step-by-Step Georgia Medicaid Enrollment
Georgia enrollment requires GAMMIS registration followed by separate credentialing with each CMO, with special attention to group panel affiliation requirements.
Create a GAMMIS Account
Register at the GAMMIS portal with your NPI, Tax ID, and contact information. Group practices must register the organizational entity (Type 2 NPI) first.
Complete Application Sections
Enter provider demographics, Georgia license information, specialty designations, practice locations, ownership disclosures (5%+ interest), managing employee details, and billing configuration.
Upload Required Documents
Upload Georgia state license, NPI confirmation, W-9, IRS EIN documentation, professional liability insurance, DEA (if prescribing), voided check for EFT, and ownership disclosure forms.
Affiliate Rendering Providers to Group Panel
Critical for groups: Every individual rendering provider who will bill under the group must have their own GAMMIS enrollment actively linked to the group’s Type 2 NPI. Claims submitted by rendering providers not affiliated in the group panel will deny automatically.
Sign Provider Agreement and Submit
Sign the Georgia Medicaid provider agreement. Clean applications process in 30–45 days.
Credential with All Three CMOs
After GAMMIS approval, submit credentialing applications to Amerigroup Georgia, CareSource Georgia, and Peach State Health Plan. Credential with all three to capture the full Medicaid population.
Georgia’s CMO Landscape and 30-Day Auto-Assignment
Georgia’s three Care Management Organizations auto-assign members who don’t select a plan within 30 days, making it essential to credential with all three CMOs.
| CMO | Parent Company | Key Details |
|---|---|---|
| Amerigroup Georgia | Elevance Health | Largest market share; dominant in metro Atlanta |
| CareSource Georgia | CareSource | Growing presence; strong rural network |
| Peach State Health Plan | Centene | Statewide coverage; emphasis on maternal/child health |
When a new Medicaid beneficiary enrolls, they have 30 days to actively select a CMO. If they do not choose within that window, the state auto-assigns them. This auto-assignment distributes members unpredictably across all three plans. A provider credentialed with only Amerigroup, for example, would miss all patients auto-assigned to CareSource or Peach State — potentially 30–60% of new Medicaid members in their area.
✔ Georgia Strategy: Submit credentialing applications to all three CMOs simultaneously on the day you receive GAMMIS approval. Because auto-assignment is unpredictable, missing even one CMO can forfeit a third or more of potential patient volume.
Group Enrollment Deadline Extension and Panel Affiliation
The deadline for Group Enrollment in Georgia has been extended until late spring 2026, but the group panel affiliation requirement remains strictly enforced.
What this means in practice:
- Group practices have additional time to complete their GAMMIS group enrollment
- However, every individual rendering provider must be actively affiliated within the GAMMIS group panel
- Claims submitted by a rendering provider not linked to the group’s Type 2 NPI will deny automatically
- New providers joining a group must complete individual GAMMIS enrollment AND panel affiliation before billing
⚠ Group Panel Rule: Even if your group enrollment is complete, claims will deny if the rendering provider is not individually enrolled and affiliated in GAMMIS. Every new hire must complete their own enrollment and be linked to the group panel before seeing patients.
Frequently Asked Questions
What happens if a member doesn’t choose a CMO?
They are auto-assigned to one of the three CMOs after 30 days. This makes it essential for providers to credential with all three plans to capture auto-assigned members.
How long does Georgia Medicaid enrollment take?
GAMMIS processing takes 30–45 days. CMO credentialing adds 30–60 days per plan (can be parallelized). Total: 60–105 days with parallel CMO applications.
What is the group panel affiliation requirement?
Every individual rendering provider must have their own GAMMIS enrollment linked to the group’s Type 2 NPI. Claims from unaffiliated rendering providers deny automatically, regardless of the group’s enrollment status.
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