Medicaid prior authorization: how the approval process works

Medicaid prior authorization has no single national process, and assuming it does is the fastest way to a stalled request. Medicaid is state-administered, and every workflow starts with one question: is this member in fee-for-service (FFS) Medicaid or a managed care organization (MCO)? The answer determines who receives the request, which clinical criteria apply, and which appeal path is available if the request is denied.

This guide is written for billers and authorization coordinators who process Medicaid prior authorizations across states and plans. Because rules vary by state and plan, each section points back to the specific state or MCO document that is the binding authority for your case.

How Medicaid is structured

Medicaid prior authorization review evaluates medical necessity against the applicable clinical criteria: either the state’s published criteria for FFS programs, or the MCO’s criteria, which may follow InterQual or MCG as a baseline with plan-specific modifications. Because Medicaid is state-administered, the requirements and the responsible reviewer change with the member’s delivery system, so confirm the service requires PA for that specific state or MCO before building the request.

Reviewers confirm three things before clinical review begins:

• The requested service, procedure code, and diagnosis code combination is covered
• The provider is credentialed and in-network
• Clinical documentation supports the specific criteria cited in the plan’s coverage policy

Service categories that commonly require prior authorization across most Medicaid programs:

• Inpatient hospital admissions
• Surgical procedures
• Durable medical equipment
• Specialty pharmacy drugs
• Behavioral health services, including ABA therapy
• Home health services
• Imaging

For members under age 21, EPSDT (Early and Periodic Screening, Diagnostic, and Treatment) is the federal Medicaid benefit that requires states to cover any service medically necessary to correct or ameliorate a condition, even if that service falls outside standard adult coverage. Providers serving pediatric Medicaid patients should cite EPSDT explicitly in every PA request and appeal for services that fall outside the plan’s standard adult benefit.

Find your plan’s rules

Submitting to the wrong entity is the most common reason Medicaid PA requests stall before clinical review begins. The answer depends on whether the member is in FFS Medicaid or an MCO, and whether the MCO has delegated that service line to a specialty benefit manager. Start with the member ID card, which identifies FFS Medicaid or names the MCO, then confirm against the current state eligibility portal.

Two routing errors recur. The first is sending an MCO request to the state FFS portal when the member is enrolled in managed care. The second is submitting a carved-out service, such as behavioral health, ABA, or radiology, to the MCO when a specialty benefit manager owns the review for that line. The member ID card often does not name the carve-out vendor, so the MCO’s provider manual or provider relations line is the required verification step before you submit anything.

Working prior authorization across more than one payer? Start with Silna’s complete guide to prior authorization.

Which services and what to gather

Every Medicaid prior authorization submission requires the same core data, whether it routes to the state or an MCO. Gather it before you start the request:

• Member ID and subscriber date of birth exactly as printed
• Plan group or contract number
• CPT or HCPCS code(s) and ICD-10 diagnosis code(s)
• Rendering provider NPI and place of service
• Requested service dates
• Clinical documentation matched to the plan’s current clinical criteria

Verify the current criteria version with each plan before you submit, because MCOs update criteria on plan-year cycles and submitting against an outdated version is a documentation gap the reviewer will cite. Accurate benefits verification at this stage, confirming active coverage, the correct benefit tier, and carve-out routing, prevents the majority of administrative denials. Most MCOs and state FFS programs accept electronic submissions via portal or EDI; log the submission timestamp and confirmation number for every request.

Federal decision-timeliness standards apply to Medicaid prior authorization, and CMS has tightened them: under the Interoperability and Prior Authorization Final Rule (CMS-0057-F), standard decisions are issued within 7 calendar days and expedited decisions within 72 hours. To qualify for expedited review, submit a written request at the time of initial submission citing the specific clinical rationale that the standard timeline would seriously jeopardize the member’s health or ability to regain maximum function. Confirm the exact deadlines that apply with your state Medicaid agency or MCO, since implementation timelines vary by payer.

How to appeal a denial

The Medicaid appeal process has a strict dependency chain, and executing steps out of order or skipping a level can close off the levels above it. The path depends on whether the denial came from an MCO or from FFS Medicaid.

The general sequence for an MCO clinical denial:

1. Obtain the denial letter and identify the exact denial reason code. The letter must cite the specific clinical criteria the submission failed to meet. Do not begin drafting until you have it, because the appeal must respond to the stated criteria directly; restating the original submission produces the same outcome.

2. File the Level 1 MCO internal appeal and request peer-to-peer review at the same time, both in writing. Most MCOs require the internal appeal within 60 days of the denial notice, though plan-specific deadlines vary and must be verified. Peer-to-peer review is not a formal appeal level but resolves a meaningful share of denials before the formal process concludes.

3. Exhaust external independent review before requesting a state fair hearing. If the Level 1 appeal is denied, check the denial letter for an external independent review option; where available it must be completed first, and the external reviewer applies clinical criteria independently of the MCO.

4. Request the state fair hearing. Only after external review is denied or confirmed unavailable should the member or authorized provider representative request a state fair hearing through the state Medicaid agency. For FFS denials, the state fair hearing is the first formal level. Deadlines vary by state, so verify them on the denial notice.

How Silna reduces denials

Most avoidable Medicaid denials trace to two preventable causes: incomplete clinical documentation and incorrect routing across the FFS-versus-MCO split and any carved-out benefit. Both are detectable before the request leaves the practice. The most common failure is submitting to the wrong entity, which leaves the request sitting unprocessed while the decision clock never starts.

Silna Health’s Care Readiness Platform automates the workflow end to end: benefits verification, form population, real-time error checking, and multi-channel submission across state FFS portals, MCO portals, and delegated specialty channels. Silna’s Predictive Document Intelligence flags documentation gaps and routing errors before submission, addressing the administrative failures that reset timelines and burn appeal rights. By combining automation with built-in payor communication, Silna cuts pre-visit administrative work by 95%, per Silna Health, 2026.

Silna’s strongest adoption is among ABA therapy, physical therapy, and mental health practices, plus care management for older adults, the practice types where Medicaid prior authorization volume is highest and where the FFS-versus-MCO split and behavioral health carve-outs matter most. For teams managing Medicaid across multiple states and MCOs, Silna coordinates the full workflow so the first submission is the complete submission. See how it applies to your payer mix at silnahealth.com.

Key terms

Fee-for-service (FFS) Medicaid

The delivery system in which the state Medicaid agency pays providers directly; PA goes to the state’s portal or contracted intake vendor.

Managed care organization (MCO)

A health plan the state contracts with to manage Medicaid benefits; most enrollees are in MCOs, each with its own PA rules and portal.

EPSDT

Early and Periodic Screening, Diagnostic, and Treatment: the federal benefit requiring states to cover any service medically necessary to correct or ameliorate a condition for members under age 21.

State fair hearing

The hearing conducted by the state Medicaid agency; the final appeal level for MCO denials and the first formal level for FFS denials.

Carve-out

A service line an MCO delegates to a specialty benefit manager (such as behavioral health, ABA, or radiology); submit and appeal through the designated entity.

CMS-0057-F

The CMS Interoperability and Prior Authorization Final Rule, which sets standard PA decisions within 7 calendar days and expedited within 72 hours.

Frequently Asked Questions

This article is general educational information, not medical or insurance advice. Coverage rules and clinical criteria vary by plan and state, so consult a licensed healthcare professional or your plan administrator about your specific situation.

About the author

Jeffrey Morelli

Jeffrey Morelli is the Co-Founder and CEO of Silna Health, the first Care Readiness Platform built to remove the administrative barriers that delay care. Silna automates benefit checks, eligibility, and prior authorizations across 1,000+ payors, and is backed by $27M from Accel and Bain Capital Ventures. Before Silna, Jeff spent a decade in San Francisco building and scaling products for highly regulated industries, including leading go-to-market at Truework (Series C, acquired by Checkr).

Last reviewed: June 25, 2026.