SNF consolidated billing makes a skilled nursing facility responsible for almost every service its resident gets during a covered Medicare Part A SNF stay. In short, the daily PDPM rate pays for most labs, drugs, supplies, therapy, and transport. Outside providers must look to the facility for payment. Only a defined list of excluded services, such as physician visits, dialysis, and certain chemotherapy, can go to Medicare on a separate claim.
This guide is for SNF billing teams, physician groups, labs, and suppliers that treat SNF residents. It explains when the rule applies, who pays for what, how PDPM billing ties in, and how to stop denials and refunds.
Key Takeaways
When it applies: The rule covers residents in a covered Part A stay. Therapy rules also reach Part B residents.
Who pays: The facility pays vendors for included services, such as most labs, X-rays, drugs, and supplies.
What is excluded: Practitioner services, ESRD dialysis, listed chemotherapy, and certain hospital services go to Medicare.
How to bill: Part A stays use type of bill 21x with PDPM codes. Part B services use a 22x claim.
How to stay clean: Check stay status, sign vendor agreements, match PDPM assessments, and scrub every line.
What Is SNF Consolidated Billing?
Congress created consolidated billing alongside the SNF prospective payment system. Before that change, many suppliers billed Medicare directly for residents, and the same service could be paid twice. Now, Medicare pays the facility one bundled daily rate for the full package of care.
As a result, the facility becomes the billing hub. When a lab, imaging company, or pharmacy serves a covered resident, it bills the facility, not Medicare. The facility then reports those costs on its own claim. Medicare’s edits compare Part B claims with Part A stay dates. So, a separate claim for an included service will usually deny.
The resident is protected under this rule. An outside vendor cannot bill the patient for a service that the SNF consolidated billing rule makes the facility’s responsibility.
When SNF Consolidated Billing Applies
The rule turns on the resident’s coverage status on each date of service. Therefore, billing teams must confirm a covered stay before they choose where to send a claim.
The 3-Day Qualifying Hospital Stay
Original Medicare covers a SNF stay only after a qualifying hospital stay. The patient must be an inpatient for at least three consecutive days. The admission day counts, but the discharge day does not. Time spent in observation does not count, even when the patient stayed overnight in a hospital bed.
In addition, the patient usually must enter the SNF within 30 days of discharge and need daily skilled care. Medicare then covers up to 100 days in each benefit period, with daily coinsurance starting on day 21. Medicare Advantage plans may waive the 3-day rule, since they follow their own contracts.
Part B Services During a SNF Stay
Once the Part A stay ends, the bundle mostly stops. For example, a resident who uses all 100 days may stay on as a long-term resident. Outside suppliers can then bill Part B directly for most services.
Therapy is the main exception. Physical, occupational, and speech therapy stay in the bundle even for Part B residents. So, the facility must bill those services itself.
Who Pays for What Under SNF Consolidated Billing
Most disputes start here. The table below shows the split that matters most during a covered Part A stay.
| Service | Included (facility pays the vendor) | Excluded (bill Medicare separately) |
|---|---|---|
| Physician and practitioner visits | Not included | Professional services of physicians, NPs, PAs, CNSs, psychologists, CRNAs, nurse-midwives, MFTs, and mental health counselors |
| Lab tests | Most lab tests and specimen collection | Lab work tied to dialysis for ESRD patients |
| X-rays and diagnostic tests | Technical component of routine X-rays, EKG tracings, and ultrasounds | The professional reading; CT, MRI, cardiac catheterization, and angiography performed at a hospital |
| Drugs | Most drugs, IV solutions, and pharmacy services | Listed chemotherapy drugs and their administration, EPO for dialysis patients, radioisotopes, certain clotting factors |
| Therapy | PT, OT, and speech therapy | None for SNF residents |
| Ambulance | Most trips, including trips to a physician office | Trips tied to an excluded hospital service or dialysis, plus the trips into and out of the SNF stay |
| Supplies and equipment | Medical supplies, DME, and standard prosthetics | Customized prosthetic devices |
| Hospital outpatient care | Minor outpatient procedures on CMS’s inclusion list | Emergency room services, outpatient surgery, and radiation therapy at a hospital |
The split between the professional and technical parts of a test causes many errors. For instance, a radiologist who reads a portable chest X-ray bills the reading to Medicare Part B. However, the mobile X-ray company must bill the facility for the technical component.
CMS updates the excluded HCPCS codes every year and adds quarterly changes. Always check the current lists on the CMS consolidated billing page before you decide that a code is separately billable.
Consolidated Billing Exclusions: What Medicare Pays Separately
CMS groups consolidated billing exclusions into five major categories. Knowing the category helps a biller predict how a code behaves, even before checking the code list.
Practitioner Professional Services
Physicians and certain other practitioners bill their own professional services on a CMS-1500 claim. Place of service 31 tells Medicare the patient was in a covered SNF stay. Since 2024, the services of marriage and family therapists and mental health counselors also sit outside the bundle.
Hospital-Only Services
Some high-cost services are excluded only when a hospital or critical access hospital furnishes them on an outpatient basis. This group includes CT scans, MRI, cardiac catheterization, angiography, radiation therapy, most outpatient surgery, and emergency room care. Ambulance trips that carry the resident to and from these services are excluded too.
Dialysis, Hospice, and Chemotherapy
Dialysis and related drugs are excluded for patients with end-stage renal disease. Hospice care for the terminal illness is also excluded and is billed only by the hospice. In addition, other certified providers can bill listed chemotherapy, radioisotopes, customized prosthetics, and certain clotting factors.
Preventive Services
Flu, pneumococcal, hepatitis B, and COVID-19 vaccines, along with screening services such as mammograms, sit outside the Part A rate. However, the facility still bills these on a 22x claim.
How PDPM Billing Fits With SNF Consolidated Billing
The Patient Driven Payment Model sets the daily rate that the bundle must cover. PDPM classifies each resident in five components: physical therapy, occupational therapy, speech-language pathology, nursing, and non-therapy ancillaries. The 5-day MDS assessment produces a HIPPS code, which goes on revenue code 0022.
Two payment features matter for cost control. First, the PT and OT rates drop 2% every seven days starting on day 21. Second, the non-therapy ancillary rate triples for the first three days to reflect early drug costs. Meanwhile, a late or missing assessment can force a low default rate.
So, PDPM assessments need to match what the claim shows. For example, if the MDS reports IV medication, the record should support it. Medical review can recoup the difference when it does not.
How to Bill SNF Claims Correctly
The type of bill code tells Medicare which payment path a claim follows. Mixing them up is a common reason for SNF consolidated billing rejections.
| Type of bill | Used for | Key point |
|---|---|---|
| 21x | Medicare Part A inpatient SNF stay | Carries PDPM HIPPS codes and all included services |
| 22x | Part B services for SNF inpatients | Used when Part A does not cover the day, and for therapy and vaccines |
| 23x | SNF outpatient services | Used for patients who are not residents of the facility |
| 18x | Hospital swing bed | Swing beds outside critical access hospitals follow the same bundle |
In practice, the facility submits Part A claims monthly, in date order, with occurrence codes for the qualifying stay. Meanwhile, outside providers should hold any claim for a resident until they confirm the coverage dates.
Common SNF Consolidated Billing Problems
Most problems come from missing information rather than complex rules. These are the patterns that cost both sides the most money.
- Outside providers billing Medicare directly: A lab misses the Part A stay, so Medicare denies the claim or asks for a refund.
- Facilities surprised by vendor invoices: A mobile imaging company sends the SNF a bill nobody expected.
- Wrong professional and technical split: A vendor bills a global code when it should bill only the professional component.
- Unbundled supplies: Items that belong in the daily rate are billed piece by piece. Our guide to bundling and unbundling in medical billing explains why payers treat this as a compliance risk.
- Claim form mix-ups: Professional services are sent on an institutional claim, or the reverse. See our breakdown of professional vs institutional claims for the differences.
- Assessment mismatches: The HIPPS code does not match the MDS on file.
How to Prevent SNF Consolidated Billing Denials
Good SNF consolidated billing control is mostly a communication process. Both facilities and outside providers need a routine that confirms the stay status before anyone sends a claim.
Check for a Covered Part A Stay Before Billing
Outside providers should check eligibility for every date of service, not just the first one. The eligibility response shows open SNF stays, and the facility can confirm the admission and discharge dates. In addition, one intake question about SNF stay status catches many errors early.
Put Written Agreements in Place With Vendors
Facilities should sign written agreements with labs, imaging, pharmacy, therapy, and transport vendors. Each agreement should state the rates, the services covered, and how the vendor learns about a resident’s stay status. As a result, invoices arrive at expected prices, and vendors stop sending claims to Medicare.
Match PDPM Assessments to What You Bill
Next, compare the MDS, the physician orders, and the claim lines before each monthly bill drops. Any service that drives the PDPM classification should appear in the medical record with dates and signatures.
Scrub Every Claim Before It Leaves
Finally, run each claim through edits that check stay dates, place of service, and excluded code lists. A scrubber should flag any Part B line that overlaps a Part A stay.
- Confirm the resident’s coverage status for each date of service.
- Verify whether each HCPCS code is on the current exclusion list.
- Split professional and technical components correctly.
- Use place of service 31 for practitioner visits during a Part A stay.
- Match the HIPPS code to the MDS assessment on file.
- Keep signed vendor agreements and invoices with the claim record.
Get Expert Help With SNF Consolidated Billing
SNF consolidated billing rewards facilities and vendors that share information early. In contrast, a missed stay date can turn a routine lab into a denial or a refund request.
MedXpert Services helps facilities and practices that treat SNF residents keep claims accurate and payable. Explore our SNF and nursing home billing services to review your PDPM claims, vendor billing, and SNF consolidated billing workflow.
