PDPM stands for the Patient Driven Payment Model, the system Medicare uses to determine how much it pays skilled nursing facilities (SNFs) for each patient’s stay. It replaced an older model called RUG-IV on October 1, 2019, fundamentally changing how nursing homes get reimbursed by shifting the focus from how much therapy a patient receives to what that patient actually needs clinically.
If you work in a skilled nursing facility, handle billing, or are trying to understand a loved one’s Medicare coverage, PDPM is the framework that drives nearly every payment decision for short-term SNF stays covered under Medicare Part A.
Why PDPM Replaced the Old System
Under the previous RUG-IV model, Medicare payments were heavily tied to the number and type of therapy minutes a patient received. A facility that provided 720 minutes of therapy per week got paid more than one providing 500 minutes, regardless of whether the patient needed that much therapy. This created an obvious incentive: deliver more therapy minutes to get higher payments, even when those extra minutes weren’t necessarily beneficial.
PDPM was designed to eliminate that incentive. Instead of counting therapy minutes, the model bases payment on each patient’s clinical characteristics, their diagnoses, their functional limitations, and their overall care needs. The idea is straightforward: pay based on who the patient is and what they need, not on how many services the facility chooses to deliver. CMS implemented the switch in a budget-neutral manner, meaning it wasn’t intended to increase or decrease total Medicare spending on skilled nursing care.
How PDPM Classifies Patients
When a patient is admitted to a skilled nursing facility, their primary diagnosis is mapped to one of 10 clinical categories. These categories drive how the physical therapy and occupational therapy payment components are calculated:
- Major Joint Replacement or Spinal Surgery
- Other Orthopedic Surgery
- Non-Orthopedic Surgery
- Acute Infections
- Cardiovascular and Coagulation Conditions
- Pulmonary Conditions
- Non-Surgical Orthopedic/Musculoskeletal
- Acute Neurologic Conditions
- Cancer
- Medical Management
The classification comes from the patient’s initial assessment, recorded on a standardized form called the MDS (Minimum Data Set). This assessment captures the primary diagnosis using ICD-10 codes, along with functional status, cognitive ability, and other clinical details. CMS periodically updates these code mappings to keep them accurate. The FY 2025 final rule, for example, included several changes to allow providers to record more precise primary diagnoses.
The Five Payment Components
PDPM calculates a daily payment rate by combining five case-mix adjusted components, each reflecting a different dimension of a patient’s care needs. These aren’t separate bills. They’re pieces of a single per-day rate that the facility receives.
The physical therapy (PT) and occupational therapy (OT) components are driven by the patient’s clinical category, functional status, and cognitive level. Unlike RUG-IV, the amount of therapy actually delivered doesn’t factor into the payment calculation. A facility receives the same PT and OT payment whether it provides 300 or 600 minutes of therapy in a week.
The speech-language pathology (SLP) component accounts for conditions affecting communication and swallowing, along with cognitive impairment. The nursing component reflects the intensity of nursing care a patient requires, based on diagnoses, comorbidities, and clinical complexity. The non-therapy ancillary (NTA) component covers things like medications, supplies, and equipment. NTA scoring uses a point system based on the patient’s comorbidities and conditions, with more medically complex patients generating higher scores and higher payments.
A sixth component, for room and board (called the “non-case-mix” component), is the same for every patient and doesn’t vary based on clinical characteristics.
How Payments Change Over a Stay
One of PDPM’s distinctive features is its variable per diem adjustment, which reduces certain payment components the longer a patient remains in the facility. The logic is that care needs tend to be highest at admission and gradually decrease as a patient recovers.
For the PT and OT components, the daily rate holds steady at 100% for the first 20 days. Starting on day 21, it drops to 98% and continues declining in small steps every seven days. By days 98 through 100 (the maximum Medicare Part A SNF benefit), the adjustment factor is down to 76% of the original rate.
The NTA component follows a different, more dramatic pattern. For the first three days of a stay, the NTA payment is tripled (a 3.0 adjustment factor), reflecting the high cost of medications, lab work, and supplies during the initial stabilization period. From day 4 onward, it drops to the standard rate. This front-loading recognizes that the most expensive non-therapy costs cluster at the beginning of a stay.
What This Means for Patient Care
For patients, the most significant change under PDPM is that therapy decisions should be based on clinical judgment rather than reimbursement targets. Under RUG-IV, some patients received therapy volumes driven partly by payment thresholds. A patient might get 720 minutes per week because that’s what pushed the facility into a higher payment tier, not because they could tolerate or benefit from that intensity.
Under PDPM, therapists have more flexibility to tailor treatment plans. A patient recovering from a hip replacement might receive intensive daily therapy, while someone with a complex medical condition might receive less frequent therapy but more nursing care. The payment system no longer penalizes facilities for making those distinctions. That said, PDPM still requires skilled nursing facilities to provide appropriate levels of care. The payment is based on the assessed needs at admission, so accurate clinical documentation and coding are critical to ensuring the facility receives correct reimbursement.
Current Payment Rates
CMS updates PDPM payment rates annually. For fiscal year 2025, Medicare Part A payments to skilled nursing facilities increased by a net 4.2%, adding roughly $1.4 billion in total payments. That increase broke down into a 3.0% market basket update (reflecting rising costs for labor, supplies, and other expenses), plus a 1.7 percentage point correction for prior forecasting errors, minus a 0.5 percentage point productivity adjustment.
The FY 2025 rule also updated wage index calculations, which adjust payments based on labor costs in different geographic areas. Facilities in higher-cost regions receive larger payments to account for the difference. CMS rebased the SNF market basket to a 2022 base year, updating the cost weights that drive these calculations to better reflect current spending patterns.
How PDPM Affects Facility Operations
For skilled nursing facilities, PDPM shifted the operational focus from therapy volume to clinical accuracy. Under RUG-IV, therapy departments were often the primary revenue drivers, and facilities closely tracked therapy minutes. Under PDPM, the interdisciplinary team matters more broadly. Accurate diagnosis coding, thorough initial assessments, and proper documentation of comorbidities all directly affect payment.
Facilities that undercode a patient’s conditions or miss relevant comorbidities on the NTA component leave money on the table. Conversely, the variable per diem adjustment creates financial pressure to manage lengths of stay efficiently, since PT, OT, and NTA payments gradually decline the longer a patient stays. This aligns financial incentives with the clinical goal of discharging patients to a lower level of care as soon as they’re ready.
CMS has also continued strengthening quality oversight alongside PDPM. The FY 2025 rule added new assessment items related to social determinants of health and expanded the types of financial penalties that can be imposed on facilities with health and safety deficiencies. Starting with FY 2027, skilled nursing facilities will be required to participate in data validation for the SNF Quality Reporting Program, adding another layer of accountability to ensure that the clinical data driving PDPM payments is accurate.