Georgia Medicaid Credentialing for Mental Health Providers: GAMMIS, the Centralized CVO and the Care Management Organizations

To join Georgia Medicaid as a mental health provider, enroll through GAMMIS, the state’s Medicaid provider portal at mmis.georgia.gov; complete credentialing through Georgia’s centralized Credentialing Verification Organization (CVO), which credentials providers once for the Georgia Families plans; then sign a contract with each care management organization (CMO) you want to join. The state says complete credentialing files get a decision within 45 calendar days, but contracting with each plan takes extra time. The plans themselves are changing: current contracts with Amerigroup, CareSource and Peach State run through June 30, 2027, and new awards to CareSource, Humana, Molina and UnitedHealthcare are pending.

Georgia Medicaid covers a large share of children, pregnant women and lower-income adults in the state, and many of them need mental health care. For therapists, psychiatrists and PMHNPs in Atlanta and across Georgia, Medicaid can fill a caseload quickly, but only after three separate steps are finished.

The three steps

Step	Where	What it does
1. Medicaid enrollment	GAMMIS (mmis.georgia.gov)	Gives you a Georgia Medicaid provider ID and lets you bill Medicaid
2. Credentialing	The centralized CVO, also through GAMMIS	Verifies your license, education, malpractice and history once for the Georgia Families plans
3. Contracting	Each care management organization	Puts you in that plan’s network with agreed rates

You need all three. Being credentialed is not the same as being in network: until a plan sends a signed contract and an effective date, its members are out of network for you.

Step 1: Enroll in Georgia Medicaid (GAMMIS)

1. Get your basics ready: individual NPI with the right taxonomy, Georgia license, malpractice certificate, W-9, and the group’s NPI and tax ID if you bill as a group.
2. Complete your CAQH ProView profile and keep it attested. See our CAQH guide.
3. Apply in GAMMIS as an individual provider, and link to your group if you bill under one. Georgia has also been adding group and billing enrollment requirements, so check the current GAMMIS instructions before you file.
4. Set up GAMMIS security, including multi-factor sign-in, so your team can check claims and enrollment status.

Step 2: Credentialing through the centralized CVO

Georgia’s Department of Community Health runs an NCQA-certified centralized credentialing process for providers in Georgia Families and Georgia Families 360°. It saves you from sending the same file to every plan.

• One application covers credentialing for the Georgia Families plans.
• 45 calendar days is the state’s stated decision time for a complete application. Missing documents restart the wait.
• Recredentialing also goes through the CVO.
• Help line: Gainwell Technologies, 1-800-766-4456.

Independent practice associations and provider hospital organizations credential through the plans directly instead.

Step 3: Contract with each care management organization

After credentialing, request a contract from each plan whose members you want to see. Each plan sets its own rates, authorization rules and claim requirements, so read each contract.

The plans are changing. Today’s Georgia Families plans are Amerigroup, CareSource and Peach State Health Plan, with contracts extended through June 30, 2027. The state has announced its intent to award new contracts to CareSource, Humana, Molina Healthcare and UnitedHealthcare; when this guide was written, that award was still in the protest phase and no go-live date had been set.

What this means for you:

• Contract with the current plans now if you want Medicaid patients in the next year.
• Watch for the new plans’ provider enrollment once the state confirms the award. Amerigroup and Peach State members will need to move to the new plans, and providers will need contracts with them to keep seeing those patients.
• Keep a list of your Medicaid patients by plan, so you can tell them early what the change means for their care.

Who can bill Georgia Medicaid for mental health

Psychiatrists and PMHNPs commonly enroll and bill as individual providers. For therapists (LCSWs, LPCs and LMFTs), which license types can enroll, and whether they bill independently or through an agency or group, depends on the Medicaid program and each plan’s network rules. Some public safety-net services also run through the Georgia Department of Behavioral Health and Developmental Disabilities (DBHDD) with its own requirements. Check the current DCH policy manuals and each plan’s provider manual for your license before you apply.

How long it takes

Stage	Typical time
GAMMIS enrollment	A few weeks, if complete
CVO credentialing	Up to 45 calendar days for a complete file
CMO contracting	Varies by plan; often several weeks after credentialing
Start to first paid claim	About 60 to 120 days, longer if anything is missing

See how long credentialing takes, by payer for Medicare and commercial timelines.

Common delays

• Taxonomy or NPI mismatches between NPPES, CAQH and GAMMIS.
• Expired documents, such as malpractice certificates, in CAQH.
• Group links missing, so claims go out under the wrong billing provider.
• Seeing patients before the contract’s effective date, which leads to out-of-network denials.
• Not checking which plan a patient has, especially during the plan transition.

This guide is general information, not legal advice. Georgia Medicaid rules, plans and timelines change, so confirm current requirements on the Georgia Department of Community Health and GAMMIS websites before applying.

How RevenueCTRL can help

We are based in Atlanta and handle mental health credentialing for therapists, psychiatrists and PMHNPs across Georgia, including GAMMIS enrollment, CVO credentialing and contracts with each plan, with weekly status updates. See our Atlanta and Georgia page, or start with how to get paneled with insurance.

Frequently asked questions