Home Care Reimbursement Models: PDGM, Fee-for-Service, and Value-Based Payment

Medicare, Medicaid, and private payers each apply distinct financial structures to compensate home health agencies for services delivered in residential settings. This page examines the three dominant reimbursement frameworks — the Patient-Driven Groupings Model (PDGM), traditional fee-for-service, and value-based payment — covering their mechanics, regulatory grounding, classification logic, and the operational tensions that arise when agencies navigate multiple payer types simultaneously. Understanding these models is essential for interpreting how home care documentation requirements, patient eligibility determinations, and OASIS assessment outcomes translate into actual payment.

• Definition and Scope
• Core Mechanics or Structure
• Causal Relationships or Drivers
• Classification Boundaries
• Tradeoffs and Tensions
• Common Misconceptions
• Checklist or Steps
• Reference Table or Matrix

Definition and Scope

Home care reimbursement models are the contractual and regulatory frameworks that determine the dollar amount a payer transfers to a home health agency following the delivery of covered services. The scope of these models extends beyond billing codes — they govern case selection incentives, staffing ratios, documentation burdens, and the degree of financial risk borne by the agency versus the payer.

Three models account for the majority of home health payment in the United States:

Fee-for-Service (FFS): Payment is issued per unit of service — per visit, per hour, or per procedure. Volume drives revenue, independent of patient outcome.

Patient-Driven Groupings Model (PDGM): The dominant Medicare payment framework since January 1, 2020 (CMS, Final Rule CY 2020), PDGM replaced the prior Home Health Prospective Payment System (HHPPS) and eliminated therapy visit thresholds as a payment driver. Payment is organized into 30-day periods rather than 60-day episodes, and grouped by 432 distinct payment categories.

Value-Based Payment (VBP): A performance-contingent model in which reimbursement adjusts — upward or downward — based on quality metrics, outcomes, and efficiency measures. The Medicare Home Health Value-Based Purchasing (HHVBP) model, expanded nationally by CMS beginning January 1, 2023 (CMS HHVBP Expanded Model), adjusts Medicare fee-for-service payments by up to ±5% based on agency performance.

These models are not mutually exclusive. A single agency may operate under PDGM for Medicare beneficiaries, Medicaid managed care fee-for-service rates for Medicaid patients, and a value-based contract with a commercial insurer simultaneously.

Core Mechanics or Structure

PDGM Payment Architecture

Under PDGM, each Medicare home health episode is divided into two consecutive 30-day periods. Each period is assigned to one of 432 case-mix groups based on five classification variables:

1. Admission source — Community or post-acute care (institutional)
2. Timing — Early (first 30-day period) or Late (subsequent periods)
3. Clinical grouping — One of 12 primary diagnosis-based groupings
4. Functional impairment level — Low, Medium, or High (derived from OASIS functional items)
5. Comorbidity adjustment — None, Low, or High (based on secondary diagnoses)

Each of the 432 groups carries a distinct base payment rate, adjusted by a wage index and a Low Utilization Payment Adjustment (LUPA) threshold. A LUPA applies when the number of visits in a 30-day period falls below the group-specific threshold — typically 2 visits — triggering per-visit payment instead of the full case-mix-adjusted rate (CMS Home Health PPS).

Fee-for-Service Mechanics

FFS structures vary by payer. Medicaid FFS typically reimburses at a state-set hourly or per-visit rate for home health aide services and skilled nursing at home. Private payers may reference Medicare rates or negotiate independently. No outcome performance requirement attaches to payment under pure FFS — a visit generates a claim, and the claim generates payment if the service meets coverage criteria.

Value-Based Payment Mechanics

HHVBP calculates a Total Performance Score (TPS) for each eligible agency using a composite of outcome measures, patient experience measures (HHCAHPS), and process measures from OASIS. CMS compares each agency's TPS against a baseline and against the performance of peer agencies in the same cohort. The payment adjustment — ranging from −5% to +5% of Medicare FFS payments — applies prospectively to the following payment year, creating a one-year lag between performance and financial consequence.

Causal Relationships or Drivers

PDGM's elimination of therapy visit thresholds was a direct regulatory response to documented overutilization. Under the prior HHPPS, payment increased as therapy visit counts increased, creating financial incentives to provide therapy visits regardless of clinical necessity. The Office of Inspector General (OIG) identified this pattern in multiple work plan reports prior to PDGM implementation (HHS OIG Work Plan).

PDGM shifts the primary payment driver from visit volume to diagnostic and functional complexity at admission. This creates a different set of incentives: accurate clinical coding on admission becomes financially consequential, and agencies bear more risk if a high-acuity patient in a low-reimbursed group generates high visit volume.

VBP expansion was driven by the Improving Medicare Post-Acute Care Transformation (IMPACT) Act of 2014 (Pub. L. 113-185), which directed CMS to develop standardized assessment data and quality reporting across post-acute settings. The home care quality measures now embedded in HHVBP derive in part from that statutory mandate.

Medicaid FFS rates are set by state plan amendments and subject to federal upper payment limit (UPL) rules under 42 CFR Part 447 (eCFR §447). States have significant discretion in rate-setting, producing substantial interstate variation in per-visit Medicaid payments for equivalent services.

Classification Boundaries

Reimbursement model classification follows payer type, not service type:

A critical boundary: Medicare Advantage (MA) plans are not required to use PDGM payment structures. MA plans negotiate home health benefits directly with agencies and may impose prior authorization requirements, visit limits, and rate structures that differ substantially from traditional Medicare. The Medicare home health benefit page addresses the coverage criteria that apply under traditional Medicare, which do not automatically transfer to MA plan contracts.

Tradeoffs and Tensions

PDGM's coding dependency vs. clinical accuracy. Because payment group assignment depends on the primary diagnosis code submitted on the claim, agencies face pressure to select the highest-reimbursed clinically defensible code. The OIG has flagged upcoding risk in post-PDGM audits, and the Risk Adjustment Data Validation (RADV) process applies coding scrutiny that can result in retroactive payment recoupment.

Low-margin patients under PDGM. Patients classified in "Low" comorbidity and "Low" functional impairment groups generate the lowest PDGM payments. If these patients require more visits than the case-mix model anticipates — a common occurrence in home care for chronic conditions — agencies absorb the margin loss because payment does not adjust post-discharge.

HHVBP lag and small agency volatility. The one-year lag between performance and payment adjustment means agencies cannot immediately correct for a poor performance year. Small agencies with fewer than 60 Medicare patients per year may be excluded from HHVBP calculation due to sample size requirements, creating inequitable competitive dynamics.

Medicaid rate inadequacy. In multiple states, Medicaid FFS rates for home health aide hours fall below the market wage cost of that aide, producing structural losses on Medicaid-heavy caseloads. This is not a program design flaw that CMS has authority to remedy unilaterally — it results from state plan rate-setting under federal UPL rules.

Value-based incentives vs. access. If agencies optimize HHVBP scores by selecting patients with higher probability of positive outcomes, patients with complex or degenerative conditions — including those receiving palliative care at home — may face implicit access barriers.

Common Misconceptions

Misconception: PDGM pays per visit.
PDGM pays a flat rate per 30-day period (adjusted by case-mix group), not per visit. Visit volume within a period does not increase payment, except when a LUPA threshold is crossed and the payment structure shifts entirely to a per-visit basis.

Misconception: Value-based payment replaces PDGM.
HHVBP is an overlay that adjusts Medicare FFS payments by a percentage. It does not replace PDGM — it modifies the total payment calculated under PDGM based on performance scores. Both systems operate simultaneously.

Misconception: Medicare Advantage follows the same PDGM rates as traditional Medicare.
MA plans set their own home health reimbursement structures through contract negotiation. An agency may receive a PDGM-calculated amount from traditional Medicare and a completely different per-visit or per-episode rate from a MA plan for identical services delivered to different patients on the same day.

Misconception: Therapy visits no longer affect payment under PDGM.
Therapy visits are not a payment threshold driver under PDGM, but the functional impairment level — one of the five classification variables — is derived in part from OASIS items that reflect functional status. Therapy assessments that accurately document functional impairment still influence group assignment and payment.

Misconception: Private pay is unregulated.
Private pay hourly rates are not federally regulated, but the agencies delivering services under private pay contracts may still be subject to state licensure requirements, home care licensing by state rules, and certified home health agency standards if they hold Medicare certification.

Checklist or Steps

The following sequence describes the structural steps in determining Medicare PDGM payment for a 30-day period. This is a reference description of the CMS-defined process, not advisory guidance.

Step 1 — Establish Medicare eligibility and homebound status.
The patient must meet Medicare's homebound definition under 42 CFR §409.42. Homebound status definition and criteria govern whether a Medicare home health episode can open.

Step 2 — Complete and transmit the OASIS Start of Care assessment.
The Outcome and Assessment Information Set (OASIS-E, effective January 1, 2023) must be completed by a registered nurse or therapist. OASIS items drive functional impairment scoring.

Step 3 — Physician certification of the plan of care.
A physician or allowed non-physician practitioner must certify the plan of care before Medicare payment can be issued, per 42 CFR §484.60.

Step 4 — Assign the primary diagnosis code.
The ICD-10-CM code mapped to one of PDGM's 12 clinical groupings determines the clinical group assignment. CMS publishes annual ICD-10-CM mappings in the Home Health PPS Final Rule.

Step 5 — Determine admission source and timing.
Claims data and referral source documentation establish whether the period is Early or Late and whether the source is Community or Post-Acute.

Step 6 — Apply comorbidity adjustment.
Secondary diagnosis codes on the claim are evaluated against CMS's comorbidity interaction tables to assign None, Low, or High comorbidity adjustment.

Step 7 — Calculate the case-mix weight and apply wage index.
CMS assigns a case-mix weight to each of the 432 groups. The base payment rate is multiplied by the case-mix weight, then adjusted by the county-level wage index.

Step 8 — Evaluate LUPA threshold.
If actual visits in the 30-day period fall below the group-specific LUPA threshold, the payment reverts to a per-visit rate using the national per-visit rates by discipline published in the annual Final Rule.

Step 9 — Apply HHVBP payment adjustment (if applicable).
For agencies subject to HHVBP, CMS applies the prospectively determined payment adjustment percentage to the calculated period payment.

Reference Table or Matrix

Reimbursement Model Comparison: Key Structural Dimensions

PDGM Clinical Grouping Summary (12 Groups)

Source: CMS Home Health Grouper and ICD-10-CM Mappings, published annually in the Calendar Year Home Health PPS Final Rule.

References

• CMS Home Health Prospective Payment System (HHPPS) — Centers for Medicare & Medicaid Services; PDGM structure, LUPA thresholds, wage index, annual rate updates.