PDPM the Patient-Driven Payment Model is the Medicare Part A reimbursement system for skilled nursing facilities that calculates each resident’s daily rate based on clinical characteristics documented in the MDS, not on therapy volume. It replaced RUG-IV on October 1, 2019. Under PDPM, five separate case-mix adjusted components add up to the total daily rate and every one of them is set by MDS documentation, not by the billing team.
That distinction matters more than most SNF operators realize. By the time billing submits the claim, the rate is already locked. The 5-day MDS assessment set it. This guide explains how each component works, what drives each one up or down, and where facilities consistently leave revenue uncaptured.
Quick Summary
PDPM calculates a SNF resident’s Medicare Part A daily rate using five components: Physical Therapy (PT), Occupational Therapy (OT), Speech-Language Pathology (SLP), Nursing, and Non-Therapy Ancillaries (NTA). Each component is classified independently using MDS assessment data. The 5-day PPS assessment completed within the first eight days of the stay sets all five classifications for the entire Medicare stay unless a facility files an optional Interim Payment Assessment (IPA) to reflect a significant clinical change. The most common PDPM revenue gap is not a billing error. It is an MDS documentation gap made days before the claim was ever submitted.
Table of Contents
What PDPM Is and Why the Billing Team Does Not Control It
PDPM the Patient-Driven Payment Model is CMS’s Medicare Part A reimbursement methodology for skilled nursing facilities, effective October 1, 2019. It replaced RUG-IV, the Resource Utilization Groups Version IV system, under which daily payment rose when a facility provided more therapy minutes. Under PDPM, therapy minutes do not determine the rate. Documented clinical complexity does.
The MDS Minimum Data Set is the standardized resident assessment instrument completed by the MDS coordinator at admission and at key intervals throughout the stay. Every PDPM payment component is derived from MDS data. The 5-day PPS assessment sets all five component classifications, and those classifications determine the daily rate from Day 1 through discharge or until a facility files an IPA.
The HIPPS code Health Insurance Prospective Payment System code is the five-character string on the Medicare Part A claim that determines the daily rate. It is not a billing field. It is the direct output of five independent MDS classification decisions. The MDS coordinator creates it. Billing submits it.
Most SNFs treat PDPM accuracy as a billing problem. The billing team reviews the HIPPS code at Triple Check, flags rejections, and sends denied claims back to MDS. None of that changes a rate that was set three weeks earlier. PDPM accuracy belongs to whoever completes the MDS and in most facilities that is the MDS coordinator, a role that reports to the DON, not to billing.
For FY 2026, CMS updated SNF PPS rates by 3.2%, adding an estimated $1.16 billion in aggregate payments to SNFs compared to FY 2025. (Source: CMS FY 2026 SNF PPS Final Rule Fact Sheet) That increase applies to every facility but only to the rate their MDS documentation actually supports.
The Five PDPM Payment Components
Under PDPM, every Medicare Part A resident is classified into five independent case-mix groups simultaneously one per component. The daily rate is the sum of all five. Each component has its own classification logic, its own MDS data sources, and its own revenue exposure when documentation is incomplete or misclassified.
|
Component
|
Approximate Share of Daily Rate
|
|---|---|
|
Nursing
|
~39%
|
|
Non-Therapy Ancillaries (NTA)
|
~23%
|
|
Physical Therapy (PT)
|
~16%
|
|
Occupational Therapy (OT)
|
~16%
|
|
Speech-Language Pathology (SLP)
|
~6%
|
Source: Megadata, May 2026, citing CMS PDPM component structure
1. Physical Therapy Clinical Category and Functional Score
The PT component is classified using two factors: the resident’s primary diagnosis clinical category and their Section GG functional score at admission. The primary diagnosis is coded in MDS item I0020B and mapped to one of ten PDPM clinical categories. That category, combined with the Section GG functional score, determines one of 16 PT case-mix groups. Therapy minutes play no role.
Section GG is the standardized functional assessment in the MDS measuring independence versus dependence across mobility and self-care tasks. The PT functional score uses ten specific Section GG items, each scored on a six-level scale. A higher score reflects greater functional independence; a lower score reflects greater dependence and clinical complexity.
One FY 2026 change affects PT classification directly. CMS finalized 33 ICD-10 codes reclassified from Medical Management to Return to Provider effective October 1, 2025 including codes for Type 1 diabetes, hypoglycaemia, and obesity. (Source: CMS FY 2026 SNF PPS Final Rule Fact Sheet) Facilities using any of these codes in MDS item I0020B receive rejected claims, not just underpaid ones. Verify your most frequently used primary diagnoses against the CMS FY 2026 PDPM ICD-10 Mapping file before setting the ARD on any new admission.
PT and OT payments decrease 2% every 7 days after Day 20 of the stay. (Source: LW Consulting, citing CMS PDPM Variable Per Diem Fact Sheet) The base rate applies for Days 4 through 20, when no variable per diem factors are in effect.
2. Occupational Therapy Same Framework, Classified Independently
The OT component uses the same two classification drivers as PT: primary diagnosis clinical category and Section GG functional score. It is classified independently a resident receives both a PT group and an OT group, and the two can differ based on their functional score interactions. The same variable per diem schedule applies: OT payments decrease 2% every 7 days after Day 20.
Section GG accuracy at admission drives both PT and OT classification simultaneously. A Section GG score that defaults to maximum dependence without supporting clinical observation is an audit risk. A score rushed to minimum dependence to speed the intake process is a direct revenue loss on two components at once.
3. Speech-Language Pathology Cognition, Swallowing, and Comorbidities
The SLP component is driven by four factors: primary diagnosis clinical category, cognitive status, SLP-related comorbidities, and the presence of a swallowing disorder or mechanically altered diet.
BIMS Brief Interview for Mental Status is the six-item cognitive screen in MDS Section C, typically completed within the first few days of the stay. It produces the cognitive performance score used for SLP classification. When the BIMS cannot be completed, a staff assessment for cognitive performance is required as a substitute.
A mechanically altered diet food texture modification required due to swallowing difficulty is captured in MDS Section K. Its presence moves the resident to a higher SLP classification. Unlike PT and OT, the SLP component carries no variable per diem adjustment; the rate is constant throughout the stay.
SLP-related comorbidities are frequently under coded because they span multiple MDS sections and require documentation from clinical notes, physician orders, and dietary records simultaneously. A resident with aphasia, cognitive impairment, and a mechanically altered diet qualifies for a higher SLP classification than a resident with only one of those conditions. Each must be captured independently in the MDS to count.
4. Nursing the Largest Component and the Most Consistently Miscoded
The Nursing component carries approximately 39% of the total daily rate the single largest PDPM component. Together, Nursing and NTA account for roughly 62% of the daily rate, and both respond directly to documentation completeness. (Source: Metadata, May 2026, citing CMS PDPM component structure)
Nursing is classified hierarchically based on the most resource-intensive service the resident receives. The hierarchy runs from highest to lowest reimbursement: Special Care High, Special Care Low, Clinically Complex, Behavioural Symptoms and Cognitive Performance, and Reduced Physical Function.
Extensive services tracheostomy care, ventilator or respirator management, infection isolation precautions, IV medication administration qualify a resident for the top nursing tiers regardless of other factors. The Nursing functional score, derived from Section GG, determines placement within each tier. A PHQ-9 depression score of 10 or above moves a Clinically Complex resident to a higher nursing subgroup one of the most consistently missed coding opportunities across SNF nursing classification.
The Habit That Costs Nursing Revenue
Most facilities default residents to lower nursing categories not because the clinical record supports it, but because that is how similar-looking residents have always been coded. A systematic review of nursing classification against actual care delivered not against a prior resident’s classification frequently reveals residents sitting one or two tiers below what the documentation supports. This is not up coding. It is correcting a documentation habit that was never examined. The question is not what did we code for the last hip fracture admission it is what does this resident’s care plan and nursing notes say they are receiving right now.
5. Non-Therapy Ancillaries the Most Underused Revenue Lever
The NTA component carries approximately 23% of the total daily rate and is driven entirely by a comorbidity score. CMS identified 50 conditions related to increases in NTA resource costs. Each condition is assigned a point value from 1 to 8 based on its relative cost impact; the resident’s total NTA comorbidity score is the sum of all qualifying conditions coded on the MDS. (Source: CMS PDPM Fact Sheet: NTA Comorbidity Score)
High-value NTA conditions include HIV/AIDS (8 points, plus an 18% add-on to the Nursing component), dialysis services, radiation therapy, IV medication administration (5 points), parenteral or IV feedings, stage 4 pressure ulcers, and wound infections. Lower-value conditions include diabetes mellitus (2 points) and isolation (1 point).
A single missed comorbidity shifting the NTA case-mix index from 0.96 to 1.34 represents approximately $29 per day in lost revenue for an urban SNF. (Source: LW Consulting, citing CMS PDPM Fact Sheet) On a 20-day Medicare stay, one undocumented condition costs roughly $580.
The EHR Auto-Populate Trap
NTA is the most actionable revenue lever at admission because every qualifying condition must be coded on the MDS in the correct section to count. Auto-populated EHR codes are a persistent failure point some NTA conditions require coding in both Section I (Active Diagnoses) and a separate MDS checkbox, and EHR systems that seed Section I often fail to trigger the corresponding checkbox. (Source: AAPACN, citing CMS MDS coding guidance) The MDS coordinator cannot rely on what the EHR pre-populates. Every NTA-eligible condition requires manual verification against both the clinical record and the correct MDS item before the ARD is set.
The Variable Per Diem Why the First 72 Hours Are the Highest-Revenue Window
PDPM does not pay a flat per diem for the entire stay. The variable per diem (VPD) schedule adjusts three of the five component rates at specific points in the stay. For the NTA component, the VPD factor is 3x for Days 1 through 3, then resets to 1x from Day 4 onward. For PT and OT, the rate decreases 2% every 7 days after Day 20. Nursing and SLP rates are constant throughout the stay. (Source: LW Consulting PDPM Snapshot, citing CMS Variable Per Diem Fact Sheet)
The NTA 3x multiplier means the first three days of a Medicare admission are the highest-revenue window under PDPM. A condition worth $29 per day from Day 4 onward was worth approximately $87 per day on Days 1 through 3. Every NTA comorbidity the 5-day MDS captures is worth triple during the window when hospital documentation is most likely to be incomplete and the MDS coordinator is still gathering clinical records from multiple sources.
The Hospital Packet Is the Revenue Document
Most facilities treat the hospital packet as an administrative intake item to collect before the resident is settled. The hospital packet is the NTA revenue document. Every qualifying comorbidity listed in the discharge summary, active medication list, and clinical notes either makes it onto the 5-day MDS or does not. The window closes with the ARD typically by Day 8. A comorbidity documented in nursing notes on Day 12 cannot retroactively improve the NTA classification that was set on Day 5.
A missing NTA comorbidity on the 5-day MDS does not affect that day’s rate. It affects every day of the stay from the ARD forward. There is no correction mechanism for a comorbidity that was present at admission but not coded until the billing team’s Triple Check three weeks later.
The Interim Payment Assessment the Revenue Recovery Tool Most Facilities Never File
The 5-day assessment sets the PDPM classification for the entire Medicare stay. The Interim Payment Assessment IPA is an optional MDS assessment that resets all five component classifications based on a resident’s current clinical status. Payment based on the IPA begins on the IPA’s ARD and applies for the remainder of the Part A stay. (Source: RAI Manual Chapter 2; CMS PDPM FAQ)
The IPA is optional. CMS leaves the decision entirely to the facility, expecting SNFs to monitor each resident’s clinical status continuously and file an IPA when a change in condition would produce a change in reimbursement. (Source: Net Health, citing CMS PDPM FAQ) The IPA must be submitted within 14 days of the ARD to take effect on that ARD date.
Before filing, compare the projected post-IPA rate to the current rate using the CMS PDPM Calculation Worksheet. If the new classification produces a lower rate, do not file. The IPA is worth filing when a mid-stay clinical change moves the resident to a higher nursing tier or increases the NTA comorbidity score: a new infection requiring IV antibiotics, onset of isolation precautions, a pressure ulcer staging to Level 3 or 4, or a significant functional decline.
A resident admitted for hip fracture rehabilitation who develops pneumonia with fever on Day 30 qualifies for Special Care High nursing and gains NTA points for IV antibiotic administration a combination that raises the daily rate for every remaining day of the Part A stay. (Source: FHCA Pulse, citing RAI Manual)
If your facility has never filed an IPA, it has almost certainly missed revenue on residents who developed new infections, staged-up pressure ulcers, or new IV medication orders mid-stay. The IPA is not a workaround. It is the mechanism CMS built for exactly this situation, and most facilities leave it unused.
Every facility needs a written IPA trigger policy a defined list of clinical changes that automatically prompt an IDT review. Without a written policy, the IPA decision is made inconsistently on every shift a nurse notices a clinical change but has no documented next step.
The Four Most Common PDPM Coding Gaps
ARD set before the clinical picture is complete.
The 5-day assessment window runs Days 1 through 8. Many facilities default to Day 5 or Day 6 regardless of whether therapy evaluations, hospital records, and physician orders are all in hand. Setting the ARD early locks in a classification built on incomplete data. For complex admissions with multiple comorbidities or unclear primary diagnoses, Day 7 or Day 8 is often the right ARD it allows more documentation to arrive without triggering a late assessment penalty.
NTA comorbidities coded in the wrong MDS section.
Some NTA conditions require coding in both Section I and a separate MDS checkbox. EHR systems that auto-populate Section I diagnoses often fail to trigger the corresponding checkbox, leaving the condition in the chart but out of the NTA score. Every NTA-eligible condition must be manually verified against both MDS items before the ARD is set not assumed complete because the diagnosis appears in the active problem list.
Nursing category assigned below what the clinical record supports.
The most common source of this error is not missing documentation it is documentation that was never reviewed against the nursing hierarchy before the ARD. A resident receiving IV medications, wound care, and isolation precautions qualifies for Special Care High. Confirming classification against the actual care plan before the ARD closes this gap without changing a single clinical practice.
FY 2026 Return to Provider ICD-10 codes still used as primary diagnoses.
Thirty-three codes moved to return to Provider effective October 1, 2025. Facilities still using them in MDS item I0020B receive rejected claims not denials, not underpayments, rejections. Download the FY 2026 PDPM ICD-10 Mapping file from CMS.gov and compare it against your most frequently used primary diagnoses. This is a one-time check that prevents recurring rejections on every new admission using an outdated code.
PDPM Optimization Is Not a Billing Project
Most SNFs structure PDPM accuracy as a billing function: billing reviews the HIPPS code at Triple Check, flags rejections, sends denied claims back to MDS. The structural problem is that none of those steps can change a rate set three weeks earlier.
By the time billing sees the claim, the 5-day ARD is closed. The NTA comorbidities are coded or not coded. The nursing category is fixed. Billing audits an outcome it was never in a position to influence. The pre-ARD documentation review hospital packet complete, NTA conditions mapped by MDS section, nursing classification verified against the care plan is the only point in the workflow where the rate can actually be protected.
That review belongs to the MDS coordinator and the DON. If those two roles do not have a structured joint workflow before every ARD, billing is the last line of defence for a problem that should have been solved at admission.
Accurate ICD-10 coding from the hospital packet is the starting point for both the primary diagnosis category and the NTA comorbidity score. LTC Apps Medical Code Analysis uses AI to generate ICD-10 codes from uploaded PDF hospital records or pasted clinical notes giving the MDS coordinator a structured starting point for NTA comorbidity identification before the ARD closes. For the full SNF compliance documentation framework, see the SNF Compliance Documentation Guide and the MDS 3.0 Submission Deadlines 2026 post for the assessment schedule context this process requires.
Frequently Asked Questions
PDPM the Patient-Driven Payment Model is Medicare's Part A reimbursement system for skilled nursing facilities, effective October 2019, which calculates each resident's daily rate based on clinical characteristics rather than therapy volume. Five case-mix adjusted components PT, OT, SLP, Nursing, and NTA are each classified independently using MDS assessment data and summed to produce the total daily per diem. The 5-day PPS assessment sets all five classifications for the entire Medicare stay.
MDS item I0020B (primary diagnosis) determines the clinical category for PT, OT, and SLP classification. Section GG (functional assessment) drives PT, OT, and Nursing classification. Section C (BIMS cognitive score) drives SLP. Section I (Active Diagnoses) and additional MDS checkboxes drive NTA scoring. Section K (swallowing and nutrition) affects SLP classification. The PHQ-9 depression score in Section D affects the Nursing component.
The NTA Non-Therapy Ancillary comorbidity score is a weighted count of up to 50 specific clinical conditions and extensive services, each assigned 1 to 8 points based on relative NTA cost impact. The MDS coordinator codes each qualifying condition present during the lookback period. The score is the sum of all applicable condition points and determines the NTA case-mix group, which sets the NTA portion of the daily rate. Higher-value conditions include HIV/AIDS (8 points), IV medication administration (5 points), and dialysis services.
File an IPA when a mid-stay clinical change would move the resident to a higher nursing classification or increase their NTA comorbidity score. Common triggers include new IV medication orders, onset of infection isolation precautions, a pressure ulcer staging to Level 3 or 4, or a significant functional decline. Before filing, compare the projected post-IPA rate to the current rate file only when the new classification produces a higher rate. The IPA must be submitted within 14 days of the ARD to take effect on that date.
CMS updated SNF PPS rates by 3.2% for FY 2026, adding approximately $1.16 billion in aggregate payments effective October 1, 2025. CMS also finalized 34 changes to PDPM ICD-10 code mappings 33 codes reclassified from Medical Management to Return to Provider, including codes for Type 1 diabetes, hypoglycaemia, and obesity. Facilities using these codes as primary diagnoses in MDS item I0020B will have claims rejected. Verify your primary diagnosis list against the FY 2026 PDPM ICD-10 Mapping file on CMS.gov.
The variable per diem applies to three PDPM components. The NTA component pays at 3x the base rate for Days 1 through 3, then resets to 1x for the remainder of the stay. PT and OT components decrease 2% every 7 days after Day 20. Nursing and SLP components are constant throughout the stay. The NTA 3x multiplier makes Days 1 through 3 the highest-revenue window under PDPM, which is why complete hospital documentation at admission is a direct revenue protection measure, not an administrative formality.
Who This Is For
LTC Apps is built for you if:
- You operate a skilled nursing facility or small regional SNF group and want MDS documentation workflows that capture the clinical complexity your Medicare census actually reflects
- You are an MDS coordinator or DON who wants a clearer framework for pre-ARD documentation review
- You are a billing coordinator or administrator reviewing whether your current PDPM revenue is aligned with your actual census acuity see also the SNF admissions checklist for how this connects to the admissions workflow
This is not the right fit if:
- You need a full physician-facing clinical EHR with integrated therapy documentation
- You are looking for a dedicated medical billing outsourcing service
- You require an enterprise contract with a full implementation team from day one
What Happens After You Request a Demo
- A member of the LTC Apps team responds within one business day to schedule a walkthrough
- We run a 30-minute live demo of the modules most relevant to your facility including the Medical Code Analysis module for ICD-10 identification from hospital records
- You receive pricing specific to your facility size and module selection
No long implementation timelines most facilities are live on their first LTC Apps module within 2-4 weeks. No minimum facility size LTC Apps serves single-facility SNFs and small regional groups. If you are mid-contract with another vendor, a parallel evaluation now means you are ready to switch at contract end without a rushed decision.
Ready to Protect Every Dollar Your Medicare Residents Generate?
If you operate a skilled nursing facility and want to make sure your MDS documentation captures the full clinical complexity of your Medicare census with every PDPM component classified at the level the clinical record actually supports LTC Apps was built for exactly this.
