Home Health Care Medicare Billing: How Agencies Get Paid Under PDGM
Before January 2020, Medicare paid home health agencies based primarily on the volume of therapy visits provided during a 60-day episode of care. More therapy visits meant higher payment. The incentive structure was straightforward, if not always well-aligned with patient needsp. The Patient-Driven Groupings Model (PDGM) changed that entirely. Under PDGM, Medicare pays home health agencies based on patient clinical complexity the diagnosis, functional status, and care needs of the individual rather than therapy utilization. The 60-day episode was replaced with 30-day billing periods. Payment rates are driven by clinical grouping classifications derived from OASIS assessment data. And the administrative requirements Notice of Admission filing, LUPA threshold management, early versus late episode distinctions introduced new compliance obligations that agencies are still adapting to.
Understanding how home health care Medicare billing works under PDGM is essential to understanding why some agencies are capturing the full reimbursement their patients’ conditions support and others consistently are not.
The 30-Day Billing Period
Under PDGM, Medicare home health reimbursement is structured around 30-day billing periods rather than 60-day episodes. Each 30-day period generates a separate claim and a separate payment calculation. A patient who requires two consecutive 30-day periods of skilled home health care generates two claims an early episode period and a late episode period each with its own payment rate determination.
The early versus late episode distinction matters financially because PDGM applies a late episode adjustment to the payment rate for the second and subsequent 30-day periods in a continuous home health stay. The late episode adjustment reflects CMS’s view that care intensity typically decreases as patients progress through treatment which means the payment rate for a second-period claim is lower than for a first-period claim covering the same clinical grouping. Agencies that plan care delivery around the 30-day period structure ensuring that high-intensity care aligns with early episode periods where rates are higher manage their PDGM reimbursement more effectively than those that don’t.
How PDGM Clinical Groupings Determine Payment
The payment rate for each 30-day billing period under PDGM is determined by assigning the patient to a clinical grouping based on the primary diagnosis and clinical characteristics documented in the OASIS assessment. There are six clinical groupings Musculoskeletal Rehabilitation, Neuro/Stroke Rehabilitation, Wounds, Behavioural Health, Complex Nursing Interventions, and Medication management/ Teaching/ Assessment and each carries a different base payment rate reflecting the typical resource intensity of patients in that category.
The clinical grouping assignment is driven by the primary diagnosis code entered on the claim and in the OASIS assessment. The specific ICD-10-CM code used as the primary diagnosis determines which clinical grouping the patient falls into and therefore what the base payment rate will be for the entire 30-day period. A primary diagnosis code that maps to a lower-paying clinical grouping than the patient’s actual condition supports results in systematic underpayment for every day of the billing period. This is the most consequential coding decision in PDGM billing and the one that generates the largest revenue gaps in agencies without a structured OASIS and diagnosis code review process.
OASIS Accuracy: The Foundation of PDGM Reimbursement
Because PDGM payment is derived from OASIS assessment data, the accuracy of the OASIS assessment is directly equivalent to the accuracy of the reimbursement. Every PDGM payment component clinical grouping, functional impairment level, comorbidity adjustment, and early versus late episode designation is driven by what is documented and coded in the OASIS.
The functional impairment level is an element that is frequently under coded. PDGM uses a three-tier functional impairment classification low, medium, and high derived from specific OASIS items that assess the patient’s mobility, self-care, and cognitive function. Patients who score at the medium or high functional impairment level receive higher payment rates than those scored at the low level. When OASIS items are completed with generalized or optimistic scoring rather than precise functional assessment, patients are frequently assigned to lower functional impairment tiers than their actual condition supports resulting in payment rates below what the clinical record would justify. OASIS coding also drives the comorbidity adjustment under PDGM. Patients with comorbid conditions that increase care complexity are assigned to a payment tier that adds to the clinical grouping base rate. The comorbidity diagnoses that qualify for adjustment are specified in CMS PDGM documentation, and they must be supported by clinical documentation in the patients record. Agencies that don’t systematically review secondary diagnoses for comorbidity adjustment eligibility leave payment on the table on every claim where a qualifying comorbidity is present but not coded.
What this means for your agency: OASIS accuracy is a billing function as much as a clinical documentation function. A pre-submission OASIS review process in which a billing specialist or OASIS coordinator validates clinical grouping, functional scoring, and comorbidity coding against the clinical record before claims are submitted is the single most effective step an agency can take to protect PDGM reimbursement accuracy.
The Notice of Admission
The Notice of Admission (NOA) is a filing requirement that replaced the Request for Anticipated Payment (RAP) effective January 1, 2022. The NOA must be submitted to Medicare within five calendar days of the start of care the date the first billable skilled service is provided. Late NOA submission results in a per-day payment reduction for every day between the start of care and the actual date of NOA filing. This is a direct financial penalty and with no clinical basis it results entirely from an administrative process failure.
The per-day reduction is calculated as a percentage of the 30-day period payment rate, and it accumulates for every day the NOA is late. For a high-rate clinical grouping patient with a late NOA, the financial impact can be several hundred dollars in lost reimbursement for a single 30-day period. Across a high-volume agency with inconsistent NOA filing practices, the annual revenue impact is significant.
What this means for your agency: NOA filing within five days requires a same-day admission-to-NOE trigger in the billing workflow not a batch process that runs at the end of the week. The per-day penalty structure means that even a two-day delay has a measurable cost, and a five-day delay eliminates the financial benefit of the NOA for the entire first period.
LUPA Thresholds and Low-Utilization Payment Adjustments
A Low Utilization Payment Adjustment (LUPA) applies when the number of visits provided in a 30-day billing period falls below a minimum threshold. PDGM sets LUPA thresholds by clinical grouping different groupings have different minimum visit counts, ranging from two to six visits depending on the grouping. When a patient receives fewer visits than the LUPA threshold for their clinical grouping, the agency is not paid the full 30-day period rate. Instead, it receives per-visit reimbursement a significantly lower payment that typically represents a fraction of the full period rate.
LUPA risk is highest for patients with high-acuity clinical groupings that carry higher LUPA thresholds, patients who are nearing discharge and receiving fewer visits, and patients in early-period stays where visit patterns are still being established. Agencies that monitor LUPA threshold risk per patient and adjust visit scheduling proactively ensuring that medically appropriate visits are not being omitted in ways that trigger a LUPA reduction protect reimbursement on claims that would otherwise be significantly underpaid.
How MCA Medical Billing Solutions, L.L.C. Manages Home Health Medicare Billing
MCA Medical Billing Solutions, L.L.C. provides home health Medicare billing services with PDGM-specific expertise OASIS coding review, clinical grouping validation, NOA filing management, LUPA threshold monitoring, denial management, and AR reporting for agencies that need accurate PDGM reimbursement and consistent billing compliance.