What Is Medicaid Billing?
Medicaid billing submits claims to one of 56 state or territorial Medicaid programs through the state's MMIS portal, or to one of the contracted Medicaid Managed Care Organizations that now cover roughly 70% of Medicaid beneficiaries. Compliance hinges on state-specific timely-filing windows, EVV mandates under the 21st Century Cures Act, prior-authorization rules per MCO, and HCPCS T-code adoption that varies state by state.
- 56 state and territorial Medicaid programs — each with its own MMIS, fee schedule, and timely-filing window
- ~70% of Medicaid beneficiaries are enrolled in Medicaid Managed Care (MCO plans)
- EVV mandatory for personal-care and home-health services under the 21st Century Cures Act
- HCPCS T-codes (T1015, T1019, T2025) and state-specific state-plan codes drive Medicaid-only billing
Medicaid Billing Services
A behavioral-health practice operating in three states often discovers that Medicaid billing is not one program but 56 — every state and territory operates its own Medicaid program with a separate Medicaid Management Information System (MMIS), distinct timely-filing windows ranging from 90 to 365 days, and its own panel of contracted Managed Care Organizations (MCOs) that further fragment the rules. Texas Medicaid timely filing is 95 days from date of service; New York is 90 days through eMedNY; California Medi-Cal is six months. That is the working baseline of Medicaid billing: a federal-state matching program funded under Title XIX of the Social Security Act, where roughly 70% of beneficiaries are now enrolled in Medicaid Managed Care, where Electronic Visit Verification (EVV) is federally mandated under the 21st Century Cures Act for personal-care and home-health services, and where each state's HCPCS T-code adoption (T1015 encounter rate, T1019 personal care, T2025 waiver service) creates code-set differences that cause clean-claim drift the moment a practice crosses state lines. This page covers how Medicaid billing actually plays out across MMIS submission, MCO contracting, EVV compliance, prior-authorization gates, and the prompt-pay rules state Departments of Insurance enforce against MCO carriers.
Medicaid at a Glance
Total U.S. Medicaid + CHIP enrollment
~80 million
Source: CMS, public
Number of state and territorial Medicaid programs
56
Source: CMS, public
Share of beneficiaries in managed care
~70%
Source: KFF, public
Federal Medical Assistance Percentage (FMAP) range
50%–83%
Source: CMS, public
EVV implementation deadline (personal care)
January 1, 2020
Source: 21st Century Cures Act §12006, public
EVV implementation deadline (home health)
January 1, 2023
Source: 21st Century Cures Act §12006, public
Billing Challenges Specific to Medicaid
State-by-state MMIS submission and timely-filing variation
Every state runs its own Medicaid Management Information System with distinct EDI specifications, claim-form requirements, and timely-filing windows. Texas Medicaid (TMHP portal) requires submission within 95 days from date of service; New York (eMedNY) within 90 days; California Medi-Cal within six months; Florida AHCA within 12 months. Multi-state practices that default to a single timely-filing assumption miss the shortest-window state's deadlines and write off claims that would have paid. State portals also differ on attachments — some accept 837 inline NTE segments, others require separate paper attachment via a Claims Inquiry Form.
Medicaid Managed Care Organization (MCO) fragmentation
Roughly 70% of Medicaid beneficiaries nationwide are enrolled in capitated Managed Care plans contracted by the state Medicaid agency. A patient with Medicaid coverage may actually be assigned to Centene/Sunshine Health, Humana Healthy Horizons, Molina Healthcare, UnitedHealthcare Community Plan, or Anthem Healthy Blue depending on the state and county — each with its own provider portal, prior-authorization policy, fee schedule, and claim-submission rules. The MCO's contract with the state sets the prompt-pay standard, but day-to-day claim adjudication runs through the MCO's payer system, not the state MMIS.
Electronic Visit Verification (EVV) compliance for personal care and home health
The 21st Century Cures Act §12006 requires every state Medicaid program to implement EVV for Medicaid-funded personal care services (effective January 1, 2020) and home health services (effective January 1, 2023). EVV captures six federally required data elements at point of service: type of service performed, individual receiving service, date of service, location of service, individual providing service, and time the service begins and ends. Claims for these services that lack a matching EVV record in the state's aggregator deny outright. States are at varying maturity — some operate state-mandated EVV systems (Sandata, HHAeXchange), others allow provider-choice models — and the 837P claim must reference the EVV transaction ID for it to adjudicate.
Prior authorization and the Medicaid 'soft denial' problem
State Medicaid agencies and MCOs maintain prior-authorization lists for most non-emergent procedures, durable medical equipment, behavioral health units beyond an annual cap, and any out-of-network referral. Unlike commercial denials that hit on a hard EX/CO code, Medicaid PA failures often produce 'pended' or 'denied for additional information' statuses that require provider follow-through to convert to payment. The federal prompt-pay standard under 42 CFR 447.46 requires states to pay 90% of clean claims within 30 days and 99% within 90 days, but the clock pauses on pended claims — which is why aged Medicaid AR balloons in practices without a dedicated pend-resolution workflow.
Dual-eligible (Medicare-Medicaid) coordination and crossover
Roughly 12 million Americans are dual-eligibles enrolled in both Medicare and Medicaid. Most are Qualified Medicare Beneficiaries (QMBs) for whom state Medicaid pays Medicare cost-sharing. Federal law prohibits balance-billing QMB patients (§1902(n)(3)(B) of the Social Security Act). Medicare automatically crosses these claims to state Medicaid through the COBA process, but Medicaid will only pay up to the lesser of the Medicaid fee schedule or the remaining cost-share — meaning crossovers frequently pay zero because Medicare already exceeded the Medicaid allowable. Practices must identify QMB status at eligibility (the 271 response carries the indicator) and route the patient correctly through the Medicaid secondary workflow without billing the patient.
What We Handle for Medicaid
Multi-state MMIS submission with per-state timely-filing tracking
Direct submission to state MMIS portals (TMHP, eMedNY, Medi-Cal, AHCA, etc.) with per-state timely-filing calendars built into the workflow. No claim crosses the deadline because the system enforces the shortest-window state's clock from date of service onward.
Medicaid MCO contracting and per-plan claim routing
Roster maintenance for Centene, Molina, UnitedHealthcare Community Plan, Humana Healthy Horizons, Anthem Healthy Blue, and regional MCOs. Each MCO's portal credentials, fee schedule, and PA policy maintained so claims route correctly on the patient's effective coverage as of date of service.
EVV compliance for personal care and home health
EVV system integration (Sandata, HHAeXchange, CareBridge, Tellus, or state-mandated aggregators) with visit-to-claim reconciliation so every billed unit has a matching verified visit. EDI 837P submission with EVV transaction ID reference to prevent the rejected-no-EVV-match denial.
Prior authorization and pend-resolution workflows
PA submission through MCO portals, response tracking, and dedicated pend-resolution queues that work pended Medicaid claims before they age past the prompt-pay threshold. Prior-auth requests filed with the clinical documentation and ICD-10 specificity each MCO's medical-policy library requires.
Dual-eligible crossover and QMB management
QMB status verification at intake, COBA crossover monitoring from Medicare to state Medicaid, and balance-billing prevention on dual-eligible accounts. Manual Medicaid secondary billing when COBA fails to auto-crossover within the expected window.
State-specific T-code and waiver-program billing
T1015 encounter-rate billing for FQHCs and RHCs, T1019 personal care, T2025 waiver service, T1017 case management, and the state-plan code variants each Medicaid program publishes. Waiver-program billing under 1915(c) HCBS waivers with the program-specific modifier and unit-rate logic.
Codes Frequently Billed to Medicaid
| Code | Description |
|---|---|
| T1015 | Clinic visit/encounter, all-inclusive (FQHC/RHC encounter rate) |
| T1019 | Personal care services, per 15 minutes (Medicaid HCBS) |
| T1017 | Targeted case management, each 15 minutes |
| T2025 | Waiver service, not otherwise specified |
| T1023 | Program intake assessment |
| H0031 | Mental health assessment by non-physician |
| H0036 | Community psychiatric supportive treatment, face-to-face |
| H2014 | Skills training and development, per 15 minutes |
| S5125 | Attendant care services, per 15 minutes |
| 99381 | Initial preventive visit, infant under 1 year (EPSDT/Medicaid covered) |
Last updated: 2026-04-22
Common Questions
Common questions about medicaid billing services.
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Request Review arrow_forwardHow does Medicaid timely filing work across states?
Medicaid timely-filing windows are set by each state Medicaid agency, not federally, and they vary widely. Texas Medicaid requires submission within 95 days from date of service through TMHP. New York eMedNY requires 90 days. California Medi-Cal allows six months. Florida AHCA allows 12 months. Federal regulation 42 CFR 447.45 sets a 12-month cap on how restrictive a state can be — meaning no state can require filing in less than the federally-allowed window, but most states use significantly tighter timelines. MCO contracts can further narrow the timely-filing rule beyond what the state Medicaid agency requires, so a managed-care claim may have a stricter deadline than the underlying Medicaid program.
What is Electronic Visit Verification and who does it apply to?
Electronic Visit Verification (EVV) is a federally mandated system under §12006 of the 21st Century Cures Act that requires Medicaid-funded personal care services and home health services to be electronically verified at point of care. EVV captures six required data elements: type of service, recipient, date, location, caregiver, and start/end times. The mandate took effect January 1, 2020 for personal care and January 1, 2023 for home health. Each state operates either a state-managed EVV system (often Sandata or HHAeXchange) or an open-vendor model where providers choose a compliant aggregator. Claims for EVV-required services that do not match a verified visit in the aggregator are denied at the point of adjudication.
Why are Medicaid Managed Care claims different from straight Medicaid?
Roughly 70% of Medicaid beneficiaries are enrolled in capitated managed-care plans contracted by their state Medicaid agency. The state pays the MCO a per-member-per-month capitation, and the MCO becomes the financial risk-bearer for that beneficiary's care — including claim adjudication. Practices submit MCO claims to the MCO's payer system (Centene, Molina, UnitedHealthcare Community Plan, Humana, Anthem) rather than the state MMIS, using the MCO's payer ID, fee schedule, prior-authorization rules, and provider portal. The state Medicaid agency only adjudicates claims for fee-for-service Medicaid beneficiaries who are not enrolled in an MCO.
What is the federal prompt-pay rule for Medicaid?
Federal regulation 42 CFR 447.46 sets the prompt-pay standard for Medicaid: state Medicaid agencies and contracted MCOs must pay 90% of clean claims within 30 days of receipt and 99% within 90 days. Many states layer state prompt-pay laws on top of this federal floor with additional interest-penalty provisions for late payment. The clock pauses when a claim is pended for additional information, which is why pend-resolution workflow is a primary lever in Medicaid AR management. State Departments of Insurance enforce prompt-pay against the contracted MCOs and accept provider complaints when payments lag.
Why are HCPCS T-codes used so heavily in Medicaid?
HCPCS Level II T-codes are reserved by CMS for use by state Medicaid agencies and are not generally recognized by Medicare or commercial payers. State Medicaid programs use T-codes to bill services that fall outside the standard CPT code set — encounter-rate billing for FQHCs and RHCs (T1015), personal care services (T1019), waiver services (T2025), targeted case management (T1017), and program intake (T1023). State-specific behavioral health programs frequently use H-codes (H0031, H0036, H2014) alongside T-codes. The fee schedule and unit definitions for each T-code are set by the individual state Medicaid plan, so the same T-code can pay differently across state lines.
How do dual-eligible (Medicare and Medicaid) claims work?
Dual-eligible patients have both Medicare and Medicaid coverage. Most are Qualified Medicare Beneficiaries (QMBs) for whom state Medicaid pays the Medicare cost-sharing (deductibles, coinsurance, copays) on the patient's behalf. Medicare adjudicates the claim first, then automatically crosses the claim to state Medicaid through the Coordination of Benefits Agreement (COBA) process. State Medicaid pays the lesser of the remaining Medicare cost-share or the Medicaid fee schedule allowed amount — which is often zero, because Medicare commonly pays above the Medicaid allowable. Federal law prohibits balance-billing QMB patients for any Medicare cost-sharing under §1902(n)(3)(B) of the Social Security Act.
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