HCBS Waiver Billing for Assisted Living: Verify the Authority Before You Bill

For U.S. assisted living facilities that bill Medicaid home- and community-based services, the most important question often comes before claim submission:

Which Medicaid authority governs this specific service?

It is not enough to know that a resident has Medicaid coverage. It is not enough to see a prior authorization in a payer portal. Your billing team must know whether the service is delivered under a Section 1915(c) waiver, Section 1915(i) State Plan HCBS benefit, Section 1915(k) Community First Choice program, Section 1115 demonstration, or another state-approved Medicaid pathway.

That answer affects enrollment status, eligibility rules, service-plan requirements, authorization controls, unit methodology, payer edits, and the supporting documentation needed to collect payment.

For assisted living providers—and skilled nursing organizations with a separate HCBS, transition, diversion, or community-based service line—this is a revenue-cycle issue, not just a policy question.

Important: This guide is for U.S. assisted living providers billing Medicaid HCBS and SNF operators with a distinct HCBS service line. It does not apply to a skilled nursing facility’s core institutional Medicaid billing, which generally follows a different benefit and reimbursement structure.

Why the HCBS authority matters

HCBS is not one national benefit with one billing workflow.

States use several federal Medicaid authorities to design and administer HCBS programs. The most common include:

• Section 1915(c) HCBS waivers
• Section 1915(i) State Plan HCBS
• Section 1915(k) Community First Choice
• Section 1115 Medicaid demonstrations

CMS recognizes these as distinct pathways through which states may provide HCBS, with different program structures and requirements. Review the CMS HCBS Final Regulation overview.

Two residents may receive services that appear similar—such as personal care, attendant support, respite, transition assistance, or care coordination—while those services are governed by different authorities.

That can change:

• Whether the resident must have active waiver participation
• Whether a program may limit enrollment
• Whether institutional level of care is required
• Which assessment and service-plan rules apply
• Which units, codes, modifiers, and authorizations support billing
• Whether EVV applies to the service
• Which reassessment and renewal dates must be monitored

For the business office, “Medicaid HCBS” is not specific enough. The authority behind the individual service matters.

HCBS also represents a growing share of Medicaid long-term services and supports. The Congressional Research Service reports that HCBS accounted for 64.6% of Medicaid LTSS spending in 2022, compared with 1.1% in 1981.

For Medicaid-participating ALFs, that makes program-status verification, authorization controls, unit tracking, and clean claims central to revenue integrity. For operators that also file state Medicaid cost reports, keeping HCBS revenue and units cleanly separated from institutional billing matters there too, and our Medicaid cost report guide covers how that reporting works.

The four HCBS authorities

This comparison is a practical starting point for assisted living billing teams. Always validate the details against the applicable state Medicaid plan, waiver documents, MCO provider manual, service definition, and current payer guidance.

1915(c) HCBS waiver billing

Section 1915(c) allows states to provide HCBS to defined populations who would otherwise need institutional levels of care.

Unlike Medicaid state-plan services, 1915(c) waivers can limit the number of people served. The Congressional Research Service’s analysis of 1915(c) waivers explains that states may set participant limits, which can result in waiting lists or other capacity-management processes.

For billing teams, the critical point is simple:

Medicaid eligibility does not automatically establish billable 1915(c) waiver participation.

For a 1915(c)-funded service, confirm that the resident’s waiver enrollment or program participation is active for the service dates being billed. Also verify that the service is supported by a current plan and authorization.

1915(i) State Plan HCBS

Section 1915(i) allows states to offer HCBS through the Medicaid state plan rather than through a capped waiver.

States define the needs-based criteria, target population, covered services, provider standards, and billing rules. Because 1915(i) is a state-plan authority, billing teams should not apply default 1915(c) slot-management logic.

Before billing a 1915(i) service, confirm:

• The resident meets the state’s current needs-based eligibility criteria
• The service is covered under the state’s approved 1915(i) program
• The provider meets program-specific qualifications
• The service plan and authorization support the dates, units, and service code billed
• The claim follows the state or MCO billing rules

CMS includes 1915(i) among the authorities addressed in its HCBS regulations and implementation resources.

1915(k) Community First Choice

Section 1915(k), commonly known as Community First Choice or CFC, is a state-plan option for attendant services and supports.

CMS states that Community First Choice serves people who meet an institutional level of care and need assistance with activities of daily living, instrumental activities of daily living, or health-related tasks.

CFC is not a 1915(c) waiver. It is a state-plan option, so eligible participants are not subject to a waiver participant cap or waiting list.

For ALF billing teams, a CFC service may have its own:

• Assessment and service-plan process
• Unit methodology
• Provider qualifications
• Participant-direction requirements
• Authorization rules
• Codes, modifiers, and claims edits

A resident may receive services under CFC and another HCBS pathway if the state permits it and the services do not duplicate one another.

1115 Medicaid demonstrations

Section 1115 allows CMS to approve state demonstration projects that test Medicaid coverage, benefit, financing, delivery-system, and payment approaches.

CMS describes Section 1115 demonstrations as a way for states to test new methods of delivering and paying for Medicaid services.

For billing purposes, an 1115 program should never be assumed to follow standard 1915(c), 1915(i), or 1915(k) rules.

The governing requirements may be found in:

• CMS approval documents and Special Terms and Conditions
• State Medicaid provider manuals
• Program-specific service definitions
• MCO provider handbooks
• Authorization policies
• State billing bulletins

If a service is tied to an 1115 demonstration, confirm the demonstration’s own requirements before applying a standard HCBS billing workflow.

The 1915(c) enrollment risk

The most important operational difference between 1915(c) waivers and state-plan HCBS benefits is the potential for enrollment limits.

States may cap the number of people served under a 1915(c) waiver. When capacity is reached, states may use waiting lists, interest lists, priority processes, or other enrollment controls.

More than 600,000 people were reported on Medicaid HCBS waiting or interest lists in 2025, according to KFF’s HCBS waiting-list tracker. Definitions and reporting practices vary by state, but the operational implication remains important: Medicaid eligibility and active waiver participation are not always the same thing.

What to verify before billing

For a 1915(c) waiver-funded service, confirm:

• Medicaid coverage is active for the date of service
• The resident is enrolled in the specific waiver or program
• Waiver participation is active for the dates billed
• Level-of-care and target-population requirements remain current
• The service plan supports the service delivered
• The authorization supports the dates, units, provider type, and service code
• The service does not duplicate a benefit funded through another Medicaid pathway

These details may appear across eligibility systems, MCO portals, service plans, case-manager records, waiver notices, authorizations, payer guidance, and remittance data. The required source varies by state and program.

A state capacity change does not automatically mean existing participants are no longer billable. Existing authorizations, participant protections, and transition rules may still apply. But a new referral pause, waiver amendment, capacity update, or state notice should trigger a review of affected residents, admissions, authorizations, and claims instructions.

For example, Indiana’s official waiver information reports 55,969 federally approved slots across two waivers for the period from July 1, 2025 through June 30, 2026. The state also publishes waiver waiting-list and capacity information through its HCBS Medicaid Waiver Waiting List Information page.

The point is not to make claims decisions based on statewide enrollment headlines. The point is to have a reliable process for confirming current participant-specific program status.

Unit-based HCBS billing requires different controls

Facility-based Medicaid billing often uses a per diem or case-mix reimbursement model. HCBS billing frequently uses units.

Depending on the state, service, authority, and payer, a service may be billed in:

• 15-minute increments
• Per-visit units
• Daily units
• Monthly units
• Bundled units
• Another state-defined measure

There is no universal federal HCBS unit rule. The applicable methodology comes from the state Medicaid program, waiver or state-plan service definition, MCO provider manual, authorization, and billing guidance.

For example, Indiana’s HCBS billing guidelines show how authorization, case-management, provider, service, and claims requirements can differ by HCBS program.

Common unit-billing failures

Applying the wrong rounding logic. A 22-minute service does not automatically equal two 15-minute units. State and payer rules determine how partial units, rounding, modifiers, and supporting documentation are handled.

Missing an authorization overage. A resident may have a fixed number of units for an authorization period. If the facility delivers units beyond the approved limit, claims may deny even when care was clinically appropriate and documented.

Leaving authorized units unbilled. Unused units may not carry forward. When authorized services are not scheduled, documented, charged, or billed before expiration, the facility may lose otherwise available revenue.

The better operational question is not only “Do we have authorization?”

It is:

“At the current pace of service delivery, do we have enough authorized units to reach the next renewal date?”

Build a unit-burn worklist

Track these data points for every participant and service:

Review unit usage before it becomes a denial. Many organizations set internal alerts at 70%, 85%, and 95% of authorized units used, adjusting those thresholds to reflect payer turnaround times and the time needed to obtain a revised authorization.

Track authority at the service level

A resident may receive services funded through more than one Medicaid authority if the state permits it and the person-centered service plan prevents duplication.

For example, a resident could receive qualifying attendant services through Community First Choice while receiving a separate, nonduplicative service under a 1915(c) waiver.

That makes a service-level billing control essential:

Track authority by service, not only by resident.

A resident record marked “Medicaid HCBS” does not provide enough detail if different services carry different authorities, unit rules, eligibility requirements, authorizations, EVV expectations, and claims instructions.

For participants with more than one HCBS funding pathway, maintain separate records for:

• Authority and program behind each service
• Service plan and authorization source
• Authorization dates, units, and conditions
• Service code, modifier, and payer
• Assessment and reassessment deadlines
• EVV requirements, if applicable
• Provider qualification requirements
• Claim status and denial reasons
• Duplicate-service controls

Three billing failures to prevent

The following examples are illustrative and not legal advice or client case studies.

1. Waiver participation was not current

A resident remained Medicaid eligible, and the care team continued delivering services. But a required reassessment or waiver-program action was not completed in time.

The facility billed based on the resident’s Medicaid eligibility and prior authorization. The payer denied the claim because the resident’s 1915(c) participation was not active for the dates billed.

Prevention: Add active waiver or program status for the date of service to the pre-bill validation process.

2. Services were billed under the wrong program pathway

A facility treated all of a resident’s HCBS services as if they were funded under a 1915(c) waiver. One service was funded through a state-plan HCBS pathway with different units and claims requirements.

The care was documented, but the claim used the wrong unit logic and was denied.

Prevention: Maintain a service-level authority matrix that identifies the program, code, modifier, authorization, unit type, and payer requirements for every HCBS service.

3. Authorized units ran out before renewal

A resident had a fixed authorization for time-based HCBS units. Services continued at a consistent pace, but unit usage was not reviewed until the end of the billing cycle.

By then, the resident had exceeded the approved amount. The services were documented, but the facility lacked a timely revised authorization.

Prevention: Track unit burn continuously and alert the billing, clinical, or authorization team before authorized units are nearly exhausted.

How LTCPro supports HCBS billing

LTCPro helps assisted living facilities build revenue-cycle controls around the information that supports clean, collectible Medicaid HCBS claims.

Depending on your facility’s systems, payer relationships, and available documentation, LTCPro can help organize and operationalize:

• Medicaid coverage verification for the date of service
• Available documentation of HCBS program or waiver participation
• Current service authorizations, dates, units, and provider requirements
• Service-plan and authorization alignment
• Authority-specific service and unit controls
• Unit-burn and authorization-expiration monitoring
• EVV-related billing workflows where applicable
• Claim denials, remittance patterns, payment lag, and follow-up needs
• Payer-specific billing edits and escalation workflows
• Internal worklists for billing, authorization, finance, and operations teams

LTCPro does not replace the state Medicaid agency, MCO, case manager, eligibility system, or legal counsel. Final decisions about eligibility, waiver participation, legal interpretation, and payer obligations should be confirmed with the relevant state program, payer, and legal advisor.

LTCPro’s role is to help your business office translate available eligibility, authorization, service-plan, utilization, and claims data into a billing workflow that protects reimbursement before it is at risk.

FAQ

What is HCBS waiver billing?

HCBS waiver billing is the process of submitting Medicaid claims for home- and community-based services under a state Medicaid HCBS program. Requirements depend on the federal authority, state program design, service definition, participant status, authorization, billing unit, provider type, and payer rules.

What should an ALF verify before billing Medicaid HCBS?

Verify Medicaid coverage for the date of service, the authority and program governing the specific service, active program participation where applicable, the current service plan, authorization, units, provider requirements, and payer-specific claim rules.

What is a 1915(c) waiver?

A 1915(c) waiver is a Medicaid authority that lets states provide HCBS to defined populations who would otherwise need institutional care. States may limit enrollment, which is why an active waiver participation status can matter separately from general Medicaid eligibility. Review the Congressional Research Service overview of 1915(c) waivers.

Can a resident have Medicaid but not be billable under a 1915(c) waiver?

Yes. Medicaid coverage alone does not guarantee active participation in a specific 1915(c) waiver. A resident may lack current waiver participation, have an expired authorization, have an outdated service plan, or no longer meet a program requirement for the billed dates.

Are 1915(i) and 1915(k) services capped like 1915(c) waivers?

No. Sections 1915(i) and 1915(k) are Medicaid state-plan authorities and do not operate as capped 1915(c) waiver programs for eligible individuals. However, states still set program-specific eligibility, assessment, service, authorization, provider, and billing requirements. CMS provides an overview of Community First Choice under Section 1915(k).

Can one resident receive services under more than one HCBS authority?

Potentially, yes. A resident may receive services funded through more than one Medicaid authority if the state permits it and the person-centered service plan prevents duplicate payment for the same service. Billing teams should track authority, authorization, units, and payer rules separately for each service.

Why is HCBS billing often unit-based?

HCBS services are often paid per 15-minute increment, visit, day, month, or another state-defined unit. The correct methodology depends on the state program, service definition, authorization, and payer rules. Do not apply facility per diem logic or generic rounding rules without confirming the relevant Medicaid HCBS guidance.

Does every state administer HCBS billing the same way?

No. States have substantial flexibility in their HCBS programs. Service definitions, eligibility, waiver enrollment, unit rules, managed-care involvement, prior authorization, EVV requirements, claims edits, and payment processes vary by state and payer. Always validate current requirements with the state Medicaid program and MCO.

Key takeaways

• HCBS billing for assisted living begins by identifying the federal authority behind each specific service, not simply confirming that a resident has Medicaid.
• Section 1915(c) waivers may limit enrollment, so active waiver participation and service authorization can matter separately from Medicaid eligibility. Read the CRS 1915(c) waiver analysis.
• Sections 1915(i) and 1915(k) are state-plan HCBS authorities with different eligibility and billing rules from 1915(c) waivers.
• Section 1115 demonstrations are state-specific. Validate the approved demonstration terms, state guidance, and payer requirements before applying a standard HCBS billing workflow. See CMS’s Section 1115 demonstration resource.
• Unit-based HCBS billing creates unique risks around rounding, authorization overages, missed units, and renewal timing.
• For residents with multiple HCBS funding pathways, track authority at the service level.
• The most reliable HCBS billing control confirms program status, authority, service-plan support, authorization, units, and payer-specific claim requirements before submission.