Suite 1300
Salt Lake City, UT 84111
Block-1 3rd Floor, Perungudi Bypass Rd, Perungudi,
Chennai - 600096
MGR Main Rd,
Perungudi, Chennai - 600096
Villupuram,
Tamil Nadu – 605602
Long term acute care hospital billing
Precision Revenue Cycle for Long-Term Acute Care Hospitals
LTACH reimbursement is complex. LOS thresholds, interrupted stays, PPS rules, and DRG accuracy drive payment. AnnexMed protects revenue from admission to adjudication
25+ Days
Avg. LTACH
patient LOS
≥$30K
Avg. LTACH DRG reimbursement
60–70%
Medicare patient dependency
15–30%
Typical LOS-related
denial rate
LTACH billing is a specialty discipline not standard billing
Medicare LTACH PPS
Deep expertise in the LTACH Prospective Payment System, including MS-LTC-DRG weights, geometric mean LOS thresholds, and short-stay outlier payment adjustments
LOS Compliance Engine
Continuous real-time tracking of length-of-stay against Medicare threshold requirements to prevent short-stay outlier penalties and ensure full DRG reimbursement
High-Acuity Coding
Specialized coding for ventilator-dependent, tracheostomy, complex wound, and ICU-level patients, the profiles that define LTACH case mix and reimbursement
LTACH revenue risk is hidden in length of stay
30–50%
Short-stay outlier revenue losses
10–20%
Active LOS risk across LTACH census
95%+
Medical necessity approval rate proactive
25%
DRG recovery from MCC/CC capture
Key RCM Challenges
8 LTACH billing challenges that require specialized expertise
Length-of-Stay Threshold Compliance
Every MS-LTC-DRG has a Medicare geometric mean LOS threshold. Discharging below that threshold triggers short-stay outlier payment rules, collapsing expected reimbursement by 30–50%. Real-time LOS monitoring is essential, not retrospective.
Interrupted Stay Policy Management
When an LTACH patient is transferred to an IPPS hospital and returns within 3 days, Medicare's interrupted stay policy treats both admissions as a single claim. Without proactive identification, the readmission payment is voided and the billing team never sees it.
MS-LTC-DRG Optimization & Severity Capture
LTACH patients present with multiple complicating comorbidities but without complete MCC and CC documentation, the DRG weight is suppressed. Accurate capture of ventilator days, malnutrition, pressure ulcer staging, and diagnoses directly determines reimbursement.
Medical Necessity Documentation for Extended Stays
Medicare requires ongoing documentation that continued LTACH-level care is medically necessary for each patient day. Payers conduct retrospective reviews, and claims lacking sufficient clinical justification for length of stay face denial or payment reduction.
3-Day Payment Window & Preadmission Services
Services rendered in the 3 days prior to LTACH admission may be subject to the preadmission payment window, requiring bundled billing. Failure to apply this rule correctly creates duplicate payment risk, RAC audit exposure, and potential overpayment liability.
High-Acuity Procedure Coding
Ventilator management, tracheostomy care, complex wound debridement, dialysis, and parenteral nutrition are defining services in LTACH, and each carries specific ICD-10-PCS coding requirements. Inaccurate procedure coding cascades directly into DRG assignment errors.
Managed Medicare & Commercial PA Complexity
Medicare Advantage and commercial payers require prior authorization, concurrent reviews, and LOS-based discharge criteria that differ from LTACH PPS. Managing these across payers demands dedicated authorization infrastructure to ensure compliance and avoid delays
Short-Stay Outlier & High-Cost Outlier Calculations
Both the short-stay outlier (SSO) formula and the high-cost outlier (HCO) threshold require precise cost-to-charge ratio application and cost report data reconciliation. Miscalculation at either end results in systematic under- or overpayment that compounds across the full census.
Clinical Services
12 LTACH-specific RCM services
LTACH PPS & DRG Management
End-to-end management of MS-LTC-DRG assignment, geometric mean LOS thresholds, and Medicare LTACH PPS payment calculations, ensuring every claim is correctly positioned.
LOS Tracking & Outlier Control
Real-time monitoring of patient length of stay against DRG thresholds, with proactive alerts when cases approach SSO risk. Prevents revenue loss before it occurs, not after the fact.
Interrupted Stay Management
Systematic flagging of transferred patients and return admissions within the 3-day window, with claim consolidation under Medicare's interrupted stay policy to protect payment
MCC/CC Coding & DRG Optimization
Specialized clinical coders capture full severity of LTACH patients, ventilator dependence, tracheostomy procedures, wound complexity, malnutrition, and diagnoses that drive DRG weight.
Medical Necessity Support
Ongoing documentation advisory to ensure physician notes substantiate medical necessity for continued LTACH care on each patient day, reducing denial and RAC audit exposure.
Prior Authorization at Scale
Full PA management for Medicare Advantage, Medicaid managed care, and commercial payers including initial authorization, concurrent review, LOS extensions, and appeal support for denials.
3-Day Payment Window Compliance
Application of preadmission payment window rules to diagnostic and non-diagnostic services, ensuring compliant bundling and eliminating duplicate payment liability and overpayment risk
Ventilator & Tracheostomy Billing
Accurate coding for ventilator-dependent and tracheostomy cases, including day counts, weaning documentation, and sequencing to ensure DRG reimbursement
Wound & Procedure Coding
Specialized coding for wound debridement, skin grafts, negative pressure therapy, and ulcer staging, critical for MCC/CC capture and DRG accuracy in LTACH patients
Cost Report & Outlier Reconciliation
Reconciliation of short-stay and high-cost outlier calculations against cost report data, ensuring accurate cost-to-charge ratio application and correct outlier payment capture across census
Denial Management & LOS Appeals
Structured denial management for LOS-based denials, medical necessity downgrades, and DRG downcoding, with specialized appeal protocols for LTACH-specific payer decisions
Regulatory Audit Readiness
Ongoing preparation for Recovery Auditor and MAC review activities targeting LTACH, including LOS validation, medical necessity audits, and interrupted stay compliance, reducing risk.
Billing and coding reference
LTACH reimbursement quick reference
Billing Element
LTACH-Specific Detail
Claim Form
UB-04 / CMS-1450, Type of Bill 61X for LTACH
Payment System
LTACH Prospective Payment System (LTACH PPS) — MS-LTC-DRG based
Short-Stay Outlier Rule
Cases below geometric mean LOS trigger SSO formula: blended per-diem + fixed loss threshold payment
High-Cost Outlier Rule
Cases with costs exceeding HCO threshold receive amounts, requiring cost-to-charge reconciliation.
Interrupted Stay Policy
Transfer to IPPS + return within 3 days = single LTACH stay; return after 3 days = new admission payment.
3-Day Payment Window
Preadmission services within 3 days bundled into claim, cannot be billed separately.
DRG Categories
MS-LTC-DRGs parallel MS-DRGs but with LTACH-specific geometric mean LOS thresholds and relative weights
High-Weight DRGs
Tracheostomy w/ MV 96+ hrs (DRG 003/004), Extensive burns, Respiratory system diagnoses with MV
MCC/CC Impact
MCC/CC status shifts DRG assignment; missed diagnoses directly suppress DRG weight and reimbursement
Ventilator Days
MV 96+ hours drives highest-weight DRG; accurate day counting and weaning documentation is essential
Medical Necessity
Physician must document LTACH-level necessity daily; payer reviews require real-time clinical updates.
RAC Audit Focus Areas
LOS validation, interrupted stay compliance, medical necessity, DRG accuracy, outlier calculation
Medicare Advantage Rules
MA plans impose LOS caps, concurrent review, and discharge criteria, requiring payer-specific management
What makes the right LTACH RCM partner?
LOS Intelligence Built Into Every Workflow
AnnexMed monitors every LTACH case against its DRG geometric mean LOS threshold from day one. Our LOS alert system flags SSO risk before discharge, not after the claim is processed. Most RCM vendors have no LTACH-specific LOS infrastructure whatsoever.
Interrupted Stay Compliance as Standard Protocol
Transfer tracking and return admission monitoring are embedded in our LTACH intake workflow. We identify every interrupted stay scenario in real time, apply correct claim consolidation rules, and prevent silent revenue elimination before it occurs.
High-Acuity Coding Depth
Our LTACH coders specialize in the patient profiles that define LTACH case mix: ventilator-dependent patients, wound cases, tracheostomy procedures, and patients with multiple comorbidities. MCC/CC capture rates consistently exceed national benchmarks.
AI for LTACH Risk Management
Our AI predicts LOS outlier risk, identifies DRG optimization from clinical notes, detects interrupted stay exposure, and flags medical necessity gaps in real time across complex LTACH patient cases.
LTACH PPS Regulatory Expertise
We maintain LTACH PPS expertise across rate updates, cost report reconciliation, outlier thresholds, and RAC/MAC focus areas, proactively managing regulatory changes to reduce billing risk
Revenue Transparency by Patient
AnnexMed’s LTACH dashboard gives finance and compliance teams real-time visibility into LOS compliance, DRG mix, denial drivers, and outlier risk by patient, payer, and across the full census
Implementation
Deploying LTACH revenue cycle operations
LTACH Revenue & LOS Performance Audit
Analysis of DRG mix, LOS gaps, SSO losses, interrupted stays, and MCC/CC capture opportunities to set baseline and identify opportunities
Medicare PPS & Payer Rule Configuration
Calibration of workflows to LTACH PPS rules, DRG thresholds, outlier parameters, and payer requirements for plans.
Medical Necessity Documentation
Implement concurrent doc review, physician advisory workflows, and tracking to support extended stays and reduce denial
Full RCM Operations, Concurrent Deployment
Transition to full operations with zero disruption, covering eligibility, auth, coding, claims, posting, denials, and accounting
Ongoing LOS Monitoring & Revenue Protection
Continuous LOS monitoring, AI flagging DRG and outlier risk, quarterly reviews, and updates to sustain maximum LTACH revenue.
Stop losing LTACH revenue to LOS gaps and DRG errors
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Discover how AnnexMed reduces denials, accelerates reimbursements, and strengthens financial performance. Backed by measurable outcomes and proven RCM expertise, we deliver operational excellence, revenue stability, and sustainable growth you can trust.
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Proven RCM Expertise. Delivered at Scale.
For over 20 years, AnnexMed has delivered RCM solutions nationwide, combining expert billing, coding, and AR support to drive measurable results and growth.
- 20+ years of proven healthcare RCM experience
- 1,500+ professionals supporting billing, coding & AR
- 500+ certified coders across multiple specialties
- 99%+ compliance with HIPAA and security standards
- All 50 states served with consistent, scalable operations
