Rural Health Facilities: Critical Access Hospitals, RHCs, and FQHCs — Medicare Enrollment

Rural health facilities operate under entirely different Medicare enrollment and reimbursement frameworks than standard providers. Critical Access Hospitals, Rural Health Clinics, and Federally Qualified Health Centers each have their own designation pathway, billing structure, and compliance requirements. Confusing these — or applying standard fee-schedule billing rules — is one of the most expensive mistakes a rural health administrator can make.

Critical Access Hospitals (CAHs)

What makes a CAH

Critical Access Hospitals are small, rural hospitals that receive cost-based reimbursement from Medicare rather than the standard Inpatient Prospective Payment System (IPPS) and Outpatient Prospective Payment System (OPPS) rates that apply to acute care hospitals. This is the single most important financial protection for rural hospitals — cost-based reimbursement eliminates the payment-to-cost gap that threatens the viability of small-volume facilities.

CAH designation requirements

To qualify for CAH designation:

• Located in a rural area (as defined by the Medicare Conditions of Participation — not just the USDA rural definition)
• Located more than 35 miles from the nearest hospital (or 15 miles by secondary roads or in mountainous terrain)
• Maintains no more than 25 inpatient beds
• Maintains an annual average length of stay of 96 hours or less for acute inpatient care
• Provides 24/7 emergency care
• Meets all CAH Medicare Conditions of Participation

Necessary Provider exception: Some CAHs qualify under the “necessary provider” exception without meeting the mileage requirement if the State determines the hospital is necessary to provide access to care.

CAH designation process

1. The hospital applies for CAH designation through its State Survey Agency (not directly with CMS)
2. The State forwards a recommendation to the CMS Regional Office
3. CMS approves (or denies) designation
4. After designation, the hospital enrolls with CMS using CMS-855A (institutional enrollment)

⚠️ Risk flag: CAH designation is not automatic. The mileage measurement, rural area determination, and bed count are strictly applied. An error in any of these — especially if discovered post-enrollment — can result in retroactive conversion to standard IPPS/OPPS rates for prior years.

CAH billing: cost-based reimbursement

CAHs are reimbursed at 101% of reasonable costs for inpatient and outpatient services (the 1% covers the costs of cost reporting). This means:

• CAHs file annual cost reports (CMS-2552) rather than using DRG or APC payment rates
• The CAH’s reasonable costs are determined through the cost report settlement process
• Interim payments are made throughout the year; final settlement happens after the cost report is audited

CAH optional payment method (Method II): CAHs can elect to have Medicare pay physicians directly at 115% of the Medicare Physician Fee Schedule rate for professional services rendered to CAH patients, rather than including physician costs in the CAH cost report. This election must be made on the cost report and affects how physicians in the facility are paid.

Swing beds

CAHs can operate “swing beds” — inpatient beds that can be used for either acute care or skilled nursing facility (SNF) level care. This allows CAHs to provide post-acute care without a separate SNF license and enrollment. Medicare reimburses CAH swing bed days at the SNF per-diem rate rather than on a cost basis.

Rural Health Clinics (RHCs)

What makes an RHC

Rural Health Clinics are physician-directed clinics located in a rural, health professional shortage area. RHCs receive cost-based reimbursement under a per-visit Prospective Payment System (PPS) rate rather than the standard Medicare Physician Fee Schedule. As of 2021, there is an RHC payment cap; RHCs that were already operating above the cap continue at their established rate.

RHC location requirements

An RHC must be located in:

• A non-urbanized area (as defined by the U.S. Census Bureau, not the USDA definition), AND
• A health professional shortage area (HPSA), medically underserved area (MUA), or Governor-designated shortage area

Both criteria must be met simultaneously. A clinic that meets one but not both is not eligible.

RHC designation process

1. Verify the location qualifies as both rural (non-urbanized) and underserved (HPSA/MUA)
2. Apply to the State Survey Agency for RHC certification survey
3. Pass the state survey (the surveyor applies the CMS Conditions for Certification for RHCs)
4. After certification, file CMS-855B for Medicare enrollment as an RHC

⚠️ Risk flag: RHC status is site-specific, not organization-specific. If your organization opens a new clinic location, the new location must independently qualify and be certified — you cannot extend your existing RHC designation to the new site.

RHC billing

RHCs bill using the UB-04 claim form (CMS-1450) under provider billing, not the CMS-1500 form used by most physician practices. RHC claims are submitted to the Part A MAC, not the Part B MAC.

Billable services: An RHC visit is defined as a direct patient contact with a qualifying provider. The core qualifying providers are physicians, NPs, PAs, CNMs, and clinical psychologists. Not all services can be billed as an RHC visit — diagnostic tests and preventive screenings have specific rules.

Mental health billing: Effective 2024, RHCs can bill separately for mental health services in addition to other RHC services on the same day, removing the longstanding “same-day, same-provider” restriction for mental health.

RHC cost reporting

RHCs file annual cost reports (CMS-222-92). The cost report is used to reconcile actual costs against the interim per-visit payments made throughout the year.

Federally Qualified Health Centers (FQHCs)

What makes an FQHC

FQHCs are safety-net providers that receive enhanced Medicare and Medicaid reimbursement in exchange for serving all patients regardless of ability to pay, maintaining a sliding-fee scale, operating a governing board with patient majority, and meeting other HRSA Health Center Program requirements.

There are two types:

• Section 330 Grantees: Health centers that receive HRSA funding under Section 330 of the Public Health Service Act
• FQHC Look-Alikes: Health centers that meet all FQHC requirements but do not receive Section 330 grants. They receive the enhanced Medicare/Medicaid payment rates but not the federal grant funding.

FQHC designation process

For Section 330 grantees:

1. Apply to HRSA’s Health Center Program through the Notice of Funding Opportunity (NOFO) process
2. Receive a grant award from HRSA
3. Once operational, file CMS-855A for Medicare enrollment as an FQHC

For FQHC Look-Alikes:

1. Apply to HRSA for Look-Alike designation (this does not involve grant funding — it’s a designation for reimbursement purposes)
2. HRSA reviews the application and recommends designation to CMS
3. After HRSA recommendation, file CMS-855A for Medicare enrollment

⚠️ Risk flag: FQHC Look-Alike applications take 12–18 months. The HRSA review process is distinct from CMS enrollment — organizations often make the mistake of filing CMS-855A before receiving HRSA designation, which results in enrollment as a standard clinic rather than as an FQHC.

FQHC billing

FQHCs bill on the UB-04 (CMS-1450) and receive reimbursement under the FQHC Prospective Payment System (PPS). The PPS rate is set annually and varies by state. FQHCs are reimbursed per visit, not per service.

Core services that constitute an FQHC visit:

• Physician services
• Services of an NP, PA, CNM, clinical psychologist, or licensed clinical social worker
• Services incident to these core providers’ services

Mental health visits: FQHCs can bill a separate mental health visit on the same day as a medical visit (the “same-day” exception for mental health, extended to FQHCs in recent years).

Annual wellness visits and preventive services: Covered under FQHC billing and paid at the PPS rate.

New access point expansion

Existing FQHCs adding a new clinical location must file a Change in Scope of Project with HRSA before the new location can bill as an FQHC. Operating a new location as an FQHC before receiving Change in Scope approval is a compliance violation that can result in repayment of the enhanced FQHC rate for all services billed from that location.

Cost reporting

FQHCs file annual cost reports (CMS-224-14). Cost reporting captures the FQHC’s actual costs, which are compared to the PPS rate. Unlike CAHs and RHCs, FQHC cost reporting is informational — FQHCs are not settled based on cost reports; they’re paid at the PPS rate regardless of actual costs.

Comparison: CAH vs. RHC vs. FQHC

Compliance considerations for rural health facilities

HIPAA + 42 CFR Part 2: FQHCs that provide substance use disorder treatment must comply with 42 CFR Part 2 confidentiality rules in addition to HIPAA — stricter protections for SUD records.

Sliding-fee scale (FQHCs): FQHCs must maintain a sliding-fee scale for all services and must apply it — merely having a policy isn’t sufficient. CMS and HRSA audit sliding-fee scale compliance during site visits.

Conditions of Participation: CAHs, RHCs, and FQHCs each have distinct Medicare Conditions of Participation/Certification. Failure to maintain compliance can result in termination from Medicare — and for FQHCs, potential loss of HRSA designation.

Getting help

Rural health facility enrollment and compliance is among the most complex areas in Medicare. If you’re establishing a new CAH, RHC, or FQHC, or if you’re expanding an existing facility, a Medicare enrollment audit from Metolius Health can identify gaps before they become problems.

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