What Is a 1915(c) Medicaid Waiver? A Provider's Guide

A 1915(c) waiver is the section of the Social Security Act that lets a state ask the federal government for permission to offer Home and Community-Based Services (HCBS) to people who would otherwise require institutional care. It is the single most important funding mechanism in the world of IDD and long-term care — the majority of waiver-served individuals in the country are covered under a 1915(c) authority.

For providers, the 1915(c) structure is why your operations are so state-specific: it’s the legal reason the same service is named, documented, authorized, and paid differently in every state you operate in.

What does “1915(c)” actually mean?

“1915(c)” refers to Section 1915(c) of the Social Security Act. It authorizes the Secretary of Health and Human Services to waive certain federal Medicaid requirements so a state can cover HCBS for a specific target population — for example, people with intellectual and developmental disabilities, medically fragile children, or older adults.

The three rules a state is typically allowed to waive are what make waivers possible at all:

• Statewideness — the state can offer the program in some areas or to a capped number of people rather than everyone at once.
• Comparability — the state can offer services to one group (say, people with IDD) that it doesn’t offer to everyone on Medicaid.
• Income rules — the state can use institutional income standards, so people who wouldn’t qualify for regular Medicaid can still get HCBS.

What can a 1915(c) waiver cover?

Each waiver defines its own menu of services. Common 1915(c) services include residential habilitation, day habilitation, supported employment, personal care and attendant services, respite, private duty nursing, behavioral supports, and service coordination. A single state usually runs several 1915(c) waivers, each targeting a different population with a different service array and a different cost cap.

Why are there waiting lists?

Because 1915(c) lets a state cap enrollment, most IDD waivers have waiting lists — sometimes years long. The state commits to serving a fixed number of people within a budget neutrality limit approved by CMS. This is one of the defining realities of the IDD field: demand structurally exceeds authorized capacity, and providers operate against a fixed pool of authorized slots and hours.

How is 1915(c) different from 1915(i), 1915(k), and 1115?

They’re all HCBS authorities, but they work differently:

• 1915(c) — the classic waiver. Requires an institutional level of care, allows enrollment caps and waiting lists. The workhorse for IDD.
• 1915(i) — a state plan HCBS benefit. Does not require an institutional level of care, and generally can’t cap enrollment the same way — but has narrower service flexibility.
• 1915(k) — Community First Choice (CFC) — a state plan option for attendant services that gives states enhanced federal match, without waiting lists.
• 1115 demonstration — a broad research-and-demonstration authority states use to test large-scale program designs, including managed long-term services and supports.

What does the 1915(c) structure mean for billing and compliance?

Everything downstream of the waiver is shaped by it:

• Authorizations are finite. Services are authorized in specific units and hours tied to the person’s plan of care and level-of-care determination. Bill beyond the authorization and the claim denies.
• Documentation must match the waiver. Service definitions, staff qualifications, and progress-note requirements are written into the waiver document. An audit compares your records to those exact definitions.
• Codes and rates are state-set. The same residential habilitation service can carry different HCPCS/procedure codes and different reimbursement rates across states.
• EVV applies to the personal care and home health services within the waiver, under each state’s chosen EVV model.

How providers stay ahead of it

The operational takeaway: a 1915(c) provider isn’t running one program — they’re running as many programs as they have states and waivers, each with its own rules. Spreadsheets and generic EHRs built for Medicare fee-for-service break under that weight.

Statewise is built for exactly this. Our platform is purpose-built for Medicaid HCBS providers — it tracks authorized units and hours against the plan of care, structures documentation to each waiver’s requirements, handles EVV state by state, and scrubs claims against state and MCO rules before they go out the door. See how it maps to your programs on our IDD platform overview, or explore coverage in your state.

Frequently asked questions

What is a 1915(c) waiver in simple terms?

It’s the federal permission slip that lets a state pay for care in someone’s home or community instead of an institution, for a defined group of people, using Medicaid dollars.

Do all states have 1915(c) waivers?

Nearly every state operates multiple 1915(c) waivers, each targeting a different population. The specific waivers, names, and services vary widely by state.

Why do IDD waivers have waiting lists?

Because 1915(c) allows states to cap enrollment within an approved budget. When demand exceeds the number of funded slots, states maintain waiting lists.

What’s the difference between 1915(c) and 1915(i)?

1915(c) is a waiver that requires an institutional level of care and can cap enrollment. 1915(i) is a state plan HCBS benefit that doesn’t require institutional level of care and generally can’t impose the same enrollment caps.