Rehabilitation Revenue Cycle Management
Rehab billing built for inpatient rehabilitation and cardiac programs
Medbilling RCM handles IRF-PPS classification coding, CMG tier optimization through IRF-PAI accuracy, cardiac and pulmonary rehabilitation session tracking, and medical necessity documentation for rehabilitation facilities across all 50 states. We run UB-04 and CMS-1500 claims under one workflow, with CMG comorbidity capture and session-cap compliance built into every admission. Book a free revenue assessment and we'll review 90 days of your rehab claims and denials before you sign anything.
5-day onboarding · All 50 states
Where rehabilitation billing breaks
Five revenue leaks hiding inside your rehab billing workflow
CMG tier set without comorbidities
IRF-PAI comorbidity capture drives CMG tier assignment, and Tier 2 and 3 cases pay more than Tier 1 across every day of the stay. Missing a qualifying comorbidity on the assessment lowers payment on every admission day without triggering a denial.
Medical necessity documentation too thin
Medical necessity caused 93.8% of IRF hospital improper payments in the 2024 CMS reporting period. The IRF-PAI must show that the patient requires intensive rehab from multiple therapy disciplines and can tolerate the three-hour daily program.
Cardiac rehab billed past session cap
Medicare covers 36 cardiac rehab sessions over 36 weeks in Phase IIA. Claims beyond 36 sessions without the KX modifier deny automatically, and claims with KX but without supporting clinical documentation invite a post-payment audit.
Therapy hours logged without detail
The three-hour daily therapy requirement means each session must document type, duration, and therapeutic purpose. When a patient can't participate, the reason and plan to resume must appear in the record or the day's billing is exposed.
Sixty percent rule compliance at risk
At least 60% of an IRF's Medicare admissions must carry qualifying diagnoses like stroke, spinal cord injury, or hip fracture. Falling below the threshold risks losing IRF classification entirely, which changes every claim's payment methodology.
Five-Phase Operating System
How the Revenue Control Framework runs for rehabilitation facilities
Rehab billing breaks where CMG classification meets session documentation rules. Wrong tier, wrong therapy hours, wrong session count. The Revenue Control Framework catches each one before the claim goes out.
Onboarding and payer setup
We pull your payer contracts, load the current CMG relative weights and comorbidity tier tables, and connect to your rehab system (Epic, Cerner, PointClickCare, or whichever platform you run) within 5 days. By day one, every IRF-PAI validation rule and cardiac rehab session calendar is configured.
Eligibility and preadmission clearance
Before every IRF admission, we verify Medicare or MA coverage, confirm preadmission screening documentation, and secure prior authorization where the MA plan requires concurrent review. We run the same clearance workflow that drives collections for our hospital billing partners.
Coding and CMG validation
Certified coders assigned to your facility validate CMG assignment against the IRF-PAI, verify comorbidity capture for tier accuracy, and confirm therapy documentation meets the three-hour daily requirement before submission through our medical coding services.
Denial resolution and appeals
Denied claims get categorized by root cause within 48 hours. CO-50 medical necessity denials, CMG tier disputes, and MA concurrent review rejections each follow a separate AR recovery path because batching rehab denials into one queue doesn't work.
Reporting and revenue tracking
Live dashboards track collections by payer, denial rates by CARC code, and CMG tier accuracy per IRF-PAI assessment. You'll see which admissions are undertiered and which cardiac rehab programs are hitting session caps before the month closes.
Rehabilitation Coding Reference
Revenue and CPT codes we bill every admission
Every code here comes from rehabilitation encounters we bill weekly. We've verified each against CMS IRF-PPS guidance.
| Code | Description | Payer rule and documentation logic |
|---|---|---|
CMG codes | Case Mix Group classification on IRF-PAI | Drives IRF-PPS payment. Tier assignment depends on qualifying comorbidities. |
97110-97542 | Therapy services (PT/OT/SLP) per session | Document type, duration, and purpose. Three-hour daily minimum required. |
93797 / 93798 | Cardiac rehab without / with continuous ECG | 36 sessions over 36 weeks. Min 31 minutes per session, max 2 per day. |
G0422 / G0423 | Intensive cardiac rehab with / without exercise | 72 sessions over 18 weeks. Cannot bill same month as 93797/93798. |
G0424 | Pulmonary rehabilitation per session | COPD GOLD II-IV required. Session structure parallels cardiac rehab. |
Modifier KX | Coverage criteria met for sessions beyond 36 | Attests documentation supports additional sessions. Audit risk without records. |
0024X | IRF revenue codes on UB-04 institutional claim | Bill upon discharge. Interim billing every 60 days on extended stays. |
99221-99223 | Initial inpatient visit by physician at IRF | Physician visit required within 24 hours of admission. Daily visits documented. |
Rehabilitation Denial Patterns
Four denial codes that cost rehab facilities the most
These four denial codes, verified against the NCCI Policy Manual, drive the bulk of rehabilitation claim denials we see.
IRF admission doesn't meet medical necessity for intensive rehab
Verify IRF-PAI supports need for multiple disciplines and three-hour program
CMG tier assignment doesn't match comorbidities on the IRF-PAI
Capture all qualifying comorbidities before PAI submission to the Grouper
Cardiac rehab session billed beyond the 36-session frequency cap
Apply KX modifier with documented clinical justification for Phase IIB
MA plan authorization expired or concurrent review denied the stay
Track MA auth dates per patient; request extension before coverage lapses
Why does CO-50 hit rehab facilities hardest? Medical necessity documentation. CMS reported that 93.8% of all IRF hospital improper payments in the 2024 reporting period stemmed from medical necessity failures. We onboarded a facility that wasn't capturing qualifying comorbidities on the IRF-PAI, generating Tier 1 classifications on admissions that qualified for Tier 2 per the X12 CARC code set. We corrected the PAI workflow in week one and the tier accuracy across their census improved immediately.
Division of Work
What your team handles versus what our team handles
We don't replace your clinical staff. We plug into your workflow and handle the billing side. Here's where the line sits.
System Compatibility
Works with the systems your rehab facility runs
We don't ask you to switch platforms. Your rehab management system and clinical documentation software stay in place, and we build the billing workflow around them. Custom integrations get scoped during your revenue assessment.
Get a Free Revenue Assessment
Common Questions
What rehab facilities ask before switching billing partners
Straight answers about CMG coding, session tracking, onboarding, and the compliance workflows that matter to your facility.
How do you validate CMG tier accuracy on the IRF-PAI?
Review every IRF-PAI against the clinical record before Grouper software processes it. Flag missing qualifying comorbidities for correction before CMG assignment locks. Tier 2 and 3 payments exceed Tier 1 across all admission days, so single missed comorbidities compound across stays.
How do you handle the three-hour daily therapy documentation?
Verify each therapy session documents type, duration, and therapeutic purpose. Confirm reasons and resumption plans are documented when patients cannot participate. Missing details create audit exposure across your census.
How do you track cardiac rehab session caps and KX compliance?
Maintain per-patient session calendars tracking the 36-session Phase IIA limit. Verify clinical justification before appending KX modifier for sessions beyond 36. Claims with KX lacking documented medical necessity are audit targets.
How do you manage the 60% rule for IRF classification?
Track qualifying diagnosis percentages across Medicare census in real time. Flag trending toward the 60% threshold before compliance issues emerge. IRF classification loss shifts claims from CMG-based to DRG-based payment.
How do you handle Medicare Advantage concurrent review denials?
Track authorization dates per patient and request extensions before coverage lapses. Appeal concurrent denials with clinical documentation supporting intensive rehab necessity at IRF level.
How long does onboarding take for a rehab facility?
Five days covers CMG relative weights, comorbidity tier tables, cardiac and pulmonary rehab session calendars, IRF-PAI validation rules, and rehab management system connection before claims processing begins.
Ready when you are
The free assessment is specific to your rehab facility
We'll pull a sample of your rehabilitation claims and show your top denial reasons by dollar, your CMG tier accuracy per IRF-PAI assessment against classification benchmarks, and your aged AR by payer with filing window exposure. You keep the findings whether or not you work with us.
- CMG tier accuracy audit - comorbidity capture per IRF-PAI against clinical record
- Medical necessity review - IRF-PAI supports multiple disciplines and three-hour program
- Cardiac rehab session cap - 36-session Phase IIA limit with KX compliance
- Therapy documentation check - type, duration, and purpose per daily session
- 60% rule compliance - qualifying diagnosis percentage across Medicare census
- No setup fees. No long-term contract.
Get a Free Revenue Assessment
Sources: CMS IRF-PPS (FY 2026), CMS Compliance Tips (2024), AMA CPT (2026), X12 CARC (2026), NCCI Policy Manual (2026), 42 CFR 410.49, AACVPR. All codes verified at publication.