Noridian Audit Defense for Critical Access Hospital (CAH) | Reasonable Cost Reimbursement Audit Defense

Critical Access Hospitals in the western United States and Pacific territories conduct nearly all of their Medicare business through Noridian Healthcare Solutions, which serves as the Medicare Administrative Contractor (MAC) for Jurisdiction E — covering California, Hawaii, and Nevada, along with Guam, American Samoa, and the Northern Mariana Islands — and Jurisdiction F, covering Alaska, Arizona, Idaho, Montana, North Dakota, Oregon, South Dakota, Utah, Washington, and Wyoming. For CAHs in these jurisdictions, Noridian is not just the entity processing claims; it is also the primary conductor of medical review activity, and, through its administration of the reasonable cost reimbursement system, it plays a direct role in determining how much a CAH is ultimately paid for the services it furnishes.

This article explains Noridian’s role as MAC for CAHs in Jurisdictions E and F, how reasonable cost reimbursement audits differ from standard claim-level medical review, the specific vulnerabilities CAHs face under this payment model, and how hospitals should structure their defense across both claim-level and cost report audit tracks. It closes with how HealthBridge US supports CAHs navigating Noridian jurisdiction audits.

Noridian’s Role for CAHs in Jurisdictions E and F

As the JE and JF MAC, Noridian administers Medicare Part A and Part B claims processing, provider enrollment, appeals, and medical review for CAHs and other providers across its assigned states and territories. Because CAH reimbursement for most services is based on 101 percent of reasonable costs rather than a fixed payment schedule, Noridian’s role extends beyond typical claim adjudication to include reviewing and settling each CAH’s annual Medicare cost report — the document that ultimately determines the hospital’s actual reimbursement rate for the cost reporting period.

Noridian publishes CAH-specific provider guidance, billing charts, and medical review priorities through its jurisdiction websites, and CAHs in these jurisdictions should treat this published guidance as a leading indicator of which issues are likely to receive audit attention. Because reasonable cost reimbursement is unique to CAHs, swing bed providers, and a small number of other cost-based providers, Noridian’s medical review and audit staff bring specialized expertise to CAH-specific issues — including the 96-hour certification requirement, swing bed level-of-care documentation, and cost report allocation methodology — that differs meaningfully from the DRG-focused review conducted for IPPS hospitals.

How Reasonable Cost Audits Differ From Claim-Level Review

Reasonable cost reimbursement audits operate on two related but distinct tracks. The first is standard claim-level medical review, in which Noridian, the Supplemental Medical Review Contractor (SMRC), or a Recovery Audit Contractor (RAC) requests documentation to confirm that a specific claim’s underlying service was medically necessary and properly documented — the same Additional Documentation Request (ADR) process that applies to any Medicare provider, with response deadlines generally running 30 to 45 days depending on the reviewing contractor under 42 CFR § 405.929 and related program integrity guidance.

The second track is cost report review and settlement, a process specific to cost-based providers like CAHs. Each year, Noridian reviews the CAH’s filed cost report, may request additional documentation supporting specific cost centers or allocation methodologies, issues a tentative settlement based on the interim payments made throughout the year, and ultimately issues a Notice of Program Reimbursement (NPR) reflecting the final determination of the hospital’s allowable costs and reimbursement for that period. Noridian may also reopen a previously settled cost report within the applicable reopening period if new information or evidence of error comes to light. Because interim payments made throughout the year are reconciled against the final cost report settlement, discrepancies between interim rates and actual allowable costs can result in significant retrospective payment adjustments — in either direction — once the cost report is finally settled.

Common Vulnerabilities Under Reasonable Cost Reimbursement

Several recurring issues create audit exposure for CAHs under Noridian’s reasonable cost reimbursement review. Interim payment rate accuracy is one: if a CAH’s interim rate, used for periodic payments throughout the year, diverges significantly from the hospital’s actual cost experience, the year-end settlement can result in either an unexpected recoupment or an underpayment that was never caught during the year. CAHs should monitor their actual cost experience against their interim rate periodically throughout the year, requesting a rate adjustment from Noridian when a material and sustained divergence is identified, rather than waiting for the annual settlement to reveal the gap.

Cost allocation methodology is a second recurring vulnerability, particularly for CAHs with swing bed units, distinct part psychiatric or rehabilitation units, or shared administrative and overhead functions across multiple lines of business. Noridian’s cost report auditors examine whether the statistical bases used to allocate shared costs — square footage, FTE counts, or other allocation statistics — are current, reasonable, and consistently applied, and discrepancies here are among the most frequently cited cost report audit findings. Related-party transactions and management or physician compensation arrangements represent a third area of sustained attention, since these arrangements carry an inherent risk of cost allocations that exceed fair-market-value benchmarks, which Noridian’s auditors are specifically trained to identify.

Building an Effective Defense Across Both Audit Tracks

Because claim-level ADRs and cost report review can occur simultaneously and can be related — a pattern of claim-level denials in a service line may prompt Noridian to examine whether the associated costs were properly reported, and vice versa — CAHs benefit from centralized tracking of every open Noridian inquiry, whether it originates from claim-level medical review or cost report audit. This tracking should record the specific issue, the reviewing unit within Noridian (medical review versus cost report audit staff), applicable deadlines, and submission status, allowing compliance staff to identify when a documentation gap in one track is likely to surface in the other.

For claim-level ADRs, the response should follow the standard approach applicable to any CAH claim: the complete legal medical record relevant to the service at issue, a cover narrative citing the applicable coverage and medical necessity standard, and, where relevant, physician certification or attestation documentation specific to CAH requirements such as the 96-hour rule. For cost report inquiries, the response should include the full supporting workpapers behind the specific cost center or allocation methodology under review, along with a clear explanation of why that methodology reasonably reflects the actual cost of care and is consistent with prior periods, unless a documented change in circumstances explains a shift in methodology.

Appeals Strategy for Noridian Determinations

Claim-level denials issued by Noridian follow Medicare’s standard five-level appeals process: redetermination — conducted by Noridian itself as the MAC — reconsideration by a Qualified Independent Contractor, an Administrative Law Judge hearing, review by the Medicare Appeals Council, and judicial review in federal district court. Cost report determinations follow an entirely separate appeal pathway: a CAH disputing a Notice of Program Reimbursement may appeal to the Provider Reimbursement Review Board (PRRB), subject to specific filing deadlines and a jurisdictional amount in controversy, with further review available from the CMS Administrator and, ultimately, federal court. CAHs should confirm which appeal pathway applies to a given dispute early in the process, since filing an appeal in the wrong forum, or missing the applicable deadline for either pathway, can forfeit the right to further review entirely.

Reducing Audit Exposure With Noridian Proactively

CAHs that experience fewer sustained findings under Noridian’s reasonable cost reimbursement review generally monitor Noridian’s published CAH-specific guidance and medical review priorities on an ongoing basis, treating updates as an early signal of where documentation practices should be strengthened before an ADR or cost report inquiry arrives. Periodic internal review of interim payment rate accuracy, cost allocation methodology, and related-party arrangement documentation — conducted independently of the annual cost report filing process — allows CAHs to identify and correct issues proactively rather than discovering them for the first time during a Noridian audit.

Preparing for a Noridian Probe-and-Educate Cycle

Like other MACs, Noridian frequently introduces review of a new CAH-specific issue through a probe-and-educate approach, selecting a small initial sample of claims for complex review and following up with targeted education based on the results. CAHs that receive a probe notice from Noridian should treat it as an opportunity to correct a systemic documentation issue before it expands into a larger review, engaging clinical, coding, and compliance staff to examine the specific claims selected and to request the follow-up educational session Noridian typically offers after each round. Because CAH-specific issues such as 96-hour certification and swing bed level-of-care documentation are recurring probe-and-educate topics in jurisdictions with a high concentration of CAHs, hospitals that proactively monitor Noridian’s published medical review priorities are often able to anticipate which issue is likely to be the subject of the next probe cycle and strengthen documentation accordingly before the formal review begins.

Documentation Consistency Across Interim Rate and Final Settlement

CAHs should also pay close attention to the consistency between the utilization and cost data reported for interim rate-setting purposes and the data ultimately reflected in the final cost report. When a CAH requests an interim rate adjustment during the year — for example, following a change in service volume or a new service line — the underlying data supporting that request should be consistent with what the hospital later reports in its annual cost report. Discrepancies between interim rate-setting documentation and final cost report data are a common trigger for closer Noridian scrutiny during settlement, since they can suggest either an error in the interim rate request or an issue with the final cost report itself. Maintaining a clear audit trail connecting interim rate adjustment requests to the underlying financial and utilization data — and reconciling that data against the final cost report before submission — reduces this specific source of audit exposure.

How HealthBridge US Supports Your Critical Access Hospital

Defending Critical Access Hospital reimbursement in Noridian’s jurisdictions requires fluency in both standard Medicare claim-level review and the CAH-specific reasonable cost reimbursement and cost report settlement process, each governed by different procedural rules and appeal pathways. HealthBridge US supports CAHs in Jurisdictions E and F, and nationally, with coordinated audit defense across both tracks: claim-level ADR response, cost report allocation methodology review, interim rate monitoring, Notice of Program Reimbursement analysis, and representation through both the standard Medicare appeals process and PRRB cost report appeals. If your CAH is facing a Noridian medical review, a probe-and-educate cycle, a cost report audit, or any combination of these, HealthBridge US is here to help — contact our team to discuss your reasonable cost reimbursement audit defense needs and build a coordinated compliance program spanning claim-level documentation and annual cost report accuracy.

References

• Centers for Medicare & Medicaid Services. “Information for Critical Access Hospitals” (MLN006400). https://www.cms.gov/files/document/mln006400-information-critical-access-hospitals.pdf

• Centers for Medicare & Medicaid Services. “Additional Documentation Request.” https://www.cms.gov/data-research/monitoring-programs/medicare-fee-service-compliance-programs/medical-review-education/additional-documentation-request

• Electronic Code of Federal Regulations. 42 CFR § 405.929. https://www.ecfr.gov/current/title-42/chapter-IV/subchapter-B/part-405

• Centers for Medicare & Medicaid Services. Medicare Claims Processing Manual, Chapter 29 (Appeals). https://www.cms.gov/regulations-and-guidance/guidance/manuals/downloads/clm104c29.pdf

• Centers for Medicare & Medicaid Services. “Provider Reimbursement Review Board (PRRB).” https://www.cms.gov/data-research/monitoring-programs/provider-compliance/provider-reimbursement-review-board

• U.S. Government Accountability Office. “Critical Access Hospitals: Views on How Medicare Payment and Other Factors Affect Hospital Operations.” https://www.gao.gov/assets/gao-23-105950.pdf

HealthBridge US is here to help. Our audit specialists support Critical Access Hospitals with Noridian medical review response and reasonable cost reimbursement audit defense — contact us to protect your facility’s revenue and compliance standing.