How Bundled Payment Episodes Work
- A bundled payment episode begins with the anchor hospitalization or outpatient procedure and extends through a defined post-acute period (typically 90 days). All Medicare Part A and Part B spending during that window counts toward the episode cost: the surgery itself, inpatient stay, skilled nursing facility (SNF) care, home health, physical therapy, readmissions, ED visits, and physician services related to the episode.
- CMS sets a target price for each episode based on historical spending data. Under CJR (42 CFR Part 510), target prices are calculated from 3 years of regional hospital-specific claims data, risk-adjusted for patient age, comorbidities (using the CMS Hierarchical Condition Category model), and dual-eligible status. BPCI-A uses a similar methodology but calculates target prices at the clinical episode level using national baseline spending trended forward.
- At reconciliation (performed annually by CMS), actual episode spending is compared to the target price. If actual spending falls below the target, the difference is a positive reconciliation payment that CMS distributes to the participating entity. If actual spending exceeds the target, the participating entity owes CMS the difference (subject to stop-loss limits that cap downside risk at 20% of the target price under BPCI-A).
- Quality gates protect against cost-cutting that harms patients. Under CJR, hospitals must meet or exceed the 30th percentile on composite quality scores (combining THA/TKA complication rates and HCAHPS patient experience scores) to receive the full reconciliation payment. Falling below quality thresholds reduces or eliminates gainsharing payments regardless of cost performance.
CJR Model: Mandatory Joint Replacement Bundles
- CJR (Comprehensive Care for Joint Replacement) was launched by the CMS Innovation Center in 2016 under 42 CFR Part 510. It applies to hospitals in selected metropolitan statistical areas (MSAs) for lower extremity joint replacement (MS-DRG 469 and 470) and, as of performance year 6, hip fracture episodes (MS-DRG 521). CMS finalized an extension through December 31, 2025, in the November 2023 Final Rule (88 FR 77758), with further rulemaking pending for subsequent years.
- CJR is mandatory for hospitals located in selected MSAs, meaning eligible hospitals cannot opt out. This distinguishes CJR from BPCI-A, which is voluntary. The mandatory design ensures CMS can evaluate bundled payments without self-selection bias. Hospitals in CJR markets that also participate in BPCI-A for overlapping episodes must choose one model for those episodes.
- Gainsharing under CJR allows participating hospitals to distribute reconciliation savings to physicians, post-acute providers, and other collaborators through CMS-approved gainsharing arrangements. These arrangements must comply with the CJR fraud and abuse waivers (42 CFR 510.600), which provide safe harbors from the Anti-Kickback Statute and the Stark Law for payments tied to quality and efficiency improvements. Documentation requirements include written agreements, fair market value assessments, and quality performance thresholds.
- The largest cost lever in CJR episodes is post-acute care, which accounts for 36% to 45% of total episode spending according to CMS episode spending reports. Hospitals that shift patients from SNF to home health, reduce SNF length of stay, or discharge patients directly home with outpatient physical therapy have generated the largest savings. The Lewin Group evaluation of CJR (commissioned by CMS) found that CJR hospitals reduced SNF utilization by 5.3 percentage points in the first 3 performance years.
BPCI-A: Voluntary Bundled Payments Across Specialties
- BPCI-A (Bundled Payments for Care Improvement Advanced) is a voluntary model administered by the CMS Innovation Center. It covers 34 inpatient clinical episodes and 3 outpatient clinical episodes, spanning orthopedics (major joint replacement, spine fusion, hip fracture), cardiac (AMI, heart failure, CABG, pacemaker), general surgery (cholecystectomy, hernia, bowel procedures), and medical episodes (pneumonia, COPD, sepsis). Participants select which episodes to include.
- BPCI-A participants can be acute care hospitals, physician group practices, or health system entities. Physician groups trigger episodes based on the attending physician on the anchor claim. This allows surgical practices to participate directly without hospital involvement. CMS Model Year 7 (beginning January 2026) expanded outpatient episode triggers to include more ambulatory surgical procedures.
- Risk adjustment under BPCI-A uses a CMS-developed model incorporating patient age, sex, HCC risk score, original reason for Medicare entitlement (age vs. disability), dual-eligible status, and episode-specific clinical factors. The target price is set prospectively for each model year. Participants know their target prices before the performance period begins, enabling proactive cost management.
- BPCI-A reconciliation occurs semi-annually. Positive reconciliation payments (savings) are capped based on the participant's quality composite score. Participants must report on quality measures (currently CMS Web Interface measures or MIPS-equivalent measures) and meet a quality threshold to qualify for the maximum payment. The effective discount rate (the percentage of savings CMS retains) is 3% for most episodes, meaning participants keep 97% of savings below the target price.
Reducing Episode Costs Without Compromising Care
- Post-acute care optimization is the primary savings driver across both models. According to the Medicare Payment Advisory Commission (MedPAC) June 2023 Report to Congress, post-acute care accounts for approximately 40% of spending variation across surgical episodes. Strategies include standardized discharge criteria (using validated tools like the Risk Assessment and Prediction Tool), preferred SNF networks with quality-based selection criteria, and early home health referral protocols.
- Readmission prevention directly reduces episode costs (a readmission adds $10,000 to $25,000 to episode spending) and protects quality scores. The Agency for Healthcare Research and Quality (AHRQ) Re-Engineered Discharge (RED) toolkit identifies seven evidence-based components: patient education using teach-back, medication reconciliation at discharge, a written discharge plan in plain language, follow-up appointments scheduled before discharge, a follow-up phone call within 48 hours, a patient-accessible after-visit summary, and coordination with outpatient providers.
- Implant cost standardization reduces per-case surgical spending. The Healthcare Supply Chain Association reports that implant price variation for total knee replacement ranges from $1,800 to $12,000 across manufacturers for clinically equivalent devices. Bundled payment participants who standardize to 2 to 3 preferred vendors and negotiate volume-based pricing typically reduce implant costs by 20% to 30% without affecting outcomes.
- Complication reduction through evidence-based surgical protocols (enhanced recovery after surgery / ERAS pathways, venous thromboembolism prophylaxis, surgical site infection bundles) prevents costly downstream events. A surgical site infection after joint replacement adds an average of $25,000 to $50,000 in episode costs per the CDC National Healthcare Safety Network data. Each complication prevented represents direct savings in the bundled payment model.