Scanning sources…acquiring signal · establishing uplink
11.8%
of all Medicare FFS claims
80%+
for fully-worked appeals
65%
of valid denials left on table
$57.23
avg provider cost to process
Denial Process Flow
From claim submission through multi-level appealClaim Submitted
Provider bills payer
Payer Review
Automated / clinical review
Criteria Match?
NCD / LCD / InterQual / MCG
Approval
Paid per contract rate
Denial Issued
EOB with denial reason
Appeal Ladder
120-day filing
Medicare FFS
180 days
Medicare FFS
>$180 in dispute
Medicare FFS
60 days
Medicare FFS
>$1,760 in dispute
Medicare FFS
Binding under ACA
Commercial
Denial Breakdown by Type
OIG Audit Findings (%)
Denial Rate Trend 2020–2026
Coverage Criteria Hierarchy
Decision authority stack per payer type — higher = supersedes lowerTraditional Medicare
Federal Statute (SSA §1862(a)(1)(A))
National Coverage Determinations (NCDs)
Local Coverage Determinations (LCDs)
CMS Manuals & Policy Guidance
Case-by-Case Adjudication
Medicare Advantage
Statute (must cover ≥ Original Medicare)
NCDs (mandatory)
LCDs (optional, plan discretion)
CMS Manuals → Internal Criteria (limited)
InterQual / MCG / XSOLIS CORTEX
Commercial / Private
Plan Contract / SPD / Certificate of Coverage
Issuer Policies & CPBs
InterQual / MCG / eviCore / ASAM Criteria
State Law (mandate floor)
IRO / External Review (ACA binding)
Payer Type Comparison
Side-by-side framework analysis for Traditional Medicare, MA, and CommercialTraditional Medicare
Definition Source
Statutory: §1862(a)(1)(A) SSA — "reasonable and necessary"
Prior Authorization
Limited; mostly post-payment review by MACs, RACs, QIOs
Coverage Criteria
NCDs → LCDs → CMS Manuals ⇒ Case-by-case
Appeal Levels
5 levels: MAC → QIC → ALJ → Appeals Council → Federal Court
Criteria Tools
CMS coverage manuals, Documentation Requirement Lookup Service
AI / Algorithm Policy
WISeR model (2026) adds targeted prospective review in 6 states
Medicare Advantage
Definition Source
Must cover ≥ Original Medicare basic benefits (42 CFR §422.101)
Prior Authorization
Extensive PA; constrained by CMS-4201-F and UM Committee (§422.137)
Coverage Criteria
Statute → NCD → LCD → CMS Manuals → Internal criteria (limited)
Appeal Levels
MA internal → Independent Review → ALJ → Appeals Council → Court
Criteria Tools
InterQual, MCG, XSOLIS CORTEX, proprietary algorithms
AI / Algorithm Policy
AI may assist but cannot replace individualized review (CMS FAQ 2024)
Commercial / Private
Definition Source
Contractual; defined in SPD / Certificate of Coverage per plan
Prior Authorization
Extensive; varies by plan, state law, and benefit design
Coverage Criteria
Plan contract → Issuer policies → CPBs → InterQual/MCG → State law
Appeal Levels
Internal appeal → External IRO review (binding under ACA)
Criteria Tools
InterQual, MCG, eviCore, Aetna CPBs, ASAM Criteria (SUD)
AI / Algorithm Policy
Less regulated; NCQA/URAC standards require clinical professional for denials
Key Defense Strategies
Actionable practices to avoid and overturn medical necessity denialsClinical Documentation Integrity
Document why lower care level was clinically insufficient
Record comorbidities and severity indicators explicitly
Align notes with MAC-specific LCD requirements
Include chief complaint, assessment, diagnosis, and plan for every visit
Criteria-Aware P2P Advocacy
Map clinical documentation to specific InterQual/MCG criteria
Request the specific criteria subset used for the denial
Present patient-specific factors that override population data
Document the P2P conversation and outcomes
ABN & Risk Shifting Compliance
Issue ABN (CMS-R-131) before services expected to be denied
Defective ABNs invalidate financial liability transfer
Track CMN requirements for DMEPOS items
Monitor Modifier 25 usage on minor surgery days (OIG target)
Appeal Pipeline Execution
Never leave valid denials unappealed — 80%+ overturn rate
Meet strict appeal deadlines (120 days for MAC redetermination)
Use 40-day discussion period after RAC demand letters
Consider external IRO review for commercial denials (binding)
NCCI Edit Awareness
Check PTP edits before billing (Column 1 vs Column 2)
Verify MUE limits for max units of service per day
Use modifiers 59/XE/XP/XS/XU only for genuinely separate services
Understand that NCCI edits enforce coding-level medical necessity
Audit Preparedness
Run internal self-audits before UPIC/RAC reviews
Maintain authenticated, legible records with signatures and dates
Challenge extrapolation methodologies with statistical experts
Engage legal counsel before responding to UPIC investigations
Regulatory Timeline
Key milestones reshaping medical necessity determinationsMA parity: 2-Midnight Rule, coverage criteria hierarchy, AI restrictions on denials
Interoperability & Prior Authorization final rule — electronic PA timelines mandated
MA plans must process urgent PA within 72 hrs, standard within 7 days; API-based PA required
Targeted prospective review pilot in 6 states — AI-assisted but human-final for Medicare FFS
Transparency in Coverage Schema 2.0 — standardized network names, 98% file size reduction
Payers must implement FHIR-based prior authorization APIs (CRD, DTR, PAS) for interoperability
Medical Necessity Knowledge Base
Environment 3 — ingested research docs, entities, and relationships