Best PDGM + PDPM Payment Compliance Software for Home Health and SNF 2026

PDGM 30-Day Period Compliance: Case-Mix Drivers and Audit Defense Under 42 CFR §484.205

PDGM compliance starts with accurate 30-day period case-mix classification and ends with audit-defensible supporting documentation. Under 42 CFR §484.205 (Basis of payment), every 30-day period requires a physician order, certification of patient eligibility under §424.22, face-to-face encounter documentation under §424.22(a)(1)(v), comprehensive assessment under §484.55, and plan of care under §484.60(b). Case-mix classification under 42 CFR §484.220 assigns the period to 1 of 432 groups based on timing (early vs. late), admission source (community vs. institutional), clinical grouping (12 categories), functional impairment level (low/medium/high from OASIS responses), and comorbidity adjustment (none/low/high from secondary ICD-10 codes). Each driver must be supported by source documentation: OASIS-E item-set responses for functional impairment, principal-diagnosis ICD-10 with source documentation for clinical grouping, secondary-diagnosis ICD-10 with source documentation for comorbidity. The documentation-evidence binder that holds every order, certification, comprehensive assessment, and ICD-10 source-documentation packet — indexed by 30-day period — collapses the MAC/RAC/UPIC ADR response from weeks of manual compilation to a 60-second packet generation.

PDPM Case-Mix Group Documentation: 5-Component Per-Diem Under 42 CFR Part 413

PDPM per-diem payment under 42 CFR Part 413 combines five independently case-mix adjusted components: PT (physical therapy), OT (occupational therapy), SLP (speech-language pathology), Nursing, and NTA (Non-Therapy Ancillary). Each component is driven by the MDS 3.0 assessment under 42 CFR §483.30 and the broader SNF assessment requirements. PT, OT, and SLP components decay over the length of stay under variable per-diem adjustment schedules; Nursing and NTA components are constant per-diem rates. The 5-day assessment is the only required PPS assessment under PDPM. NTA case-mix is driven by qualifying conditions documented at the SNF — IV medications, dialysis, ventilator support, parenteral nutrition, isolation for active infectious disease, and others. The documentation-evidence layer holds the supporting documentation behind each MDS item-set response: therapy evaluations and treatment notes supporting PT/OT/SLP case-mix, nursing assessment supporting nursing case-mix, NTA source documentation including MAR entries, dialysis logs, ventilator orders, and isolation orders. MAC, RAC, and UPIC complex review of PDPM per-diem claims requests exactly this source-documentation packet.

LUPA Tracking (Low Utilization Payment Adjustment): Threshold Analysis and Audit Defense

LUPA classification under 42 CFR Part 484 Subpart E reduces the PDGM 30-day period to a per-visit national rate when total visits fall below the case-mix-specific threshold (generally 2-6 visits depending on case-mix group). CMS publishes the threshold annually for each of the 432 PDGM case-mix groups, varying by clinical grouping, functional impairment level, and admission source. LUPA-rate audit findings are one of the highest-frequency PDGM payment-integrity issues — HHAs that bill the full case-mix rate when visit count was below the LUPA threshold receive overpayments that RACs and UPICs recover on post-payment review, and HHAs that bill at the LUPA rate when visit count met or exceeded the threshold under-bill the case-mix rate they were entitled to. Compliance requires three workflows: real-time visit-count tracking against the case-mix-specific LUPA threshold during the 30-day period, accurate billing of LUPA periods when visit count is genuinely below threshold, and audit-defense documentation showing that visits delivered match what was billed. The documentation-evidence binder holds the visit-note documentation that supports every visit count claimed on every 30-day period.

Home Health Payment Compliance (PDGM Periods): Always-On Documentation Versus Cycle-Building

HHA payment compliance under 42 CFR Part 484 Subpart E fails most often when documentation is built up in response to the ADR rather than maintained always-on contemporaneous to the claim. The PDGM RAP (Request for Anticipated Payment) was replaced by the NOA (Notice of Admission) in calendar year 2022, but the underlying compliance burden — physician orders, certification, face-to-face encounter, comprehensive assessment, plan of care, ICD-10 coding source documentation, OASIS source documentation, visit-level documentation — remains. The MAC, RAC, UPIC, or SMRC ADR typically gives 30-45 days to respond and the documentation must already exist contemporaneous to the claim. HHAs that maintain always-on documentation respond to ADRs in days rather than weeks and pass complex review with high confirmation rates; HHAs that scramble to build documentation after the ADR arrives produce incomplete packets, receive insufficient-documentation denials, and trigger expanded probe reviews. The documentation-evidence binder pattern collapses ADR-response cost and protects payment retention.

SNF Payment Compliance (PDPM Components): MDS 3.0 Source Documentation Under 42 CFR §483.20

SNF payment compliance under PDPM is driven by MDS 3.0 assessment accuracy and the supporting source documentation behind every MDS item-set response. Under 42 CFR §483.30 (Physician services) and the broader SNF requirements, the 5-day assessment determines the per-diem rate combining PT, OT, SLP, Nursing, and NTA case-mix components. NTA case-mix is particularly audit-prone — the qualifying conditions (IV medications, dialysis, ventilator, parenteral nutrition, isolation for active infectious disease) must be documented contemporaneous to the assessment, with MAR entries, dialysis logs, ventilator orders, and isolation orders supporting the MDS item-set response. The IPA (Interim Payment Assessment) workflow allows recalculation if significant change in condition justifies it. PDPM-compliant software must hold the MDS 3.0 source documentation, the therapy evaluations and progress notes supporting PT/OT/SLP case-mix, the nursing assessment supporting nursing case-mix, the NTA source documentation, and the IPA documentation when filed. MAC, RAC, and UPIC complex review of PDPM per-diem claims requests exactly this source-documentation packet under 42 CFR Part 413.

Medicare RAC + UPIC Audit Prep: Contractor-Specific Response Workflows

Medicare payment-integrity audit defense requires preparation for four distinct contractor types operating under 42 CFR Part 484 Subpart E (HHA payment) and 42 CFR Part 413 (SNF payment). Medicare Administrative Contractors (MACs) conduct pre-payment ADR review for newly-enrolled providers, providers on a CMS-mandated probe-and-educate cycle, and elevated-error-rate providers — typical response window 30-45 days. Recovery Audit Contractors (RACs) conduct post-payment complex review on a contingency-fee basis, recovering overpayments from claims paid 1-3 years prior — typical response window 45 days with appeal rights. Unified Program Integrity Contractors (UPICs) conduct fraud, waste, and abuse investigations including pre-payment review, post-payment review, and credible-allegation-of-fraud holds that suspend all Medicare payment to the provider pending investigation. Supplemental Medical Review Contractors (SMRCs) conduct CMS-directed targeted reviews on specific issues across multiple providers — typical response window 30-45 days. The documentation-evidence binder pattern that survives one contractor type survives all four with minor formatting changes around contractor-specific cover letters and appeal forms — the underlying physician orders, certifications, comprehensive assessments, therapy evaluations, and visit notes remain the same evidentiary baseline.