Home Health Billing Under PDGM: Avoid Denials & Late NOAs

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Your Health Magazine Contributor

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Home Health Billing Under PDGM: Avoid Denials & Late NOAs

A single late Notice of Admission can erase days of revenue on a home health claim. CMS allows exceptions to the late-filing consequences only in limited circumstances. Many agencies still run billing the way they did before 2020, and they pay for it in reductions, LUPAs, and denials. This guide explains how home health billing works under PDGM, where money leaks out, and the steps that can help reduce avoidable payment reductions and denials.

What Is PDGM and Why It Changed Home Health Billing

The Patient-Driven Groupings Model (PDGM) took effect on January 1, 2020, and it rewrote the rules for every Medicare-certified home health agency. Before PDGM, agencies billed 60-day episodes, and therapy visit counts pushed payment up. Today, CMS pays for 30-day periods, and therapy volume no longer drives the rate at all. Instead, the Centers for Medicare & Medicaid Services groups each period using five patient characteristics.

First, admission sources separate community referrals from institutional ones, such as a hospital or skilled nursing discharge in the prior 14 days. Second, timing labels the first 30-day period as early and every later period as late. Third, the principal diagnosis places the patient into one of 12 clinical groupings. Fourth, OASIS responses set the functional impairment level at low, medium, or high. Finally, secondary diagnoses can add a comorbidity adjustment.

Together, these variables produce 432 possible case-mix groups, each with its own payment weight. As a result, coding accuracy and OASIS accuracy now decide revenue before a single visit is billed. In other words, home health billing became a documentation discipline, not a data-entry task.

The NOA Rule: Five Calendar Days That Decide Your Payment

In January 2022, CMS replaced the Request for Anticipated Payment (RAP) with the Notice of Admission (NOA). The rule is simple, but the penalty is severe. Your Medicare Administrative Contractor (MAC) must receive and accept the NOA within five calendar days of the start of care. Note the word calendar. Weekends and holidays count, so a Friday admission leaves you until Wednesday.

If the NOA arrives late, Medicare reduces the payment for every day from the start of care until the day the NOA is accepted. That reduction applies to the full period, and it comes straight off the case-mix rate. Moreover, the Medicare Claims Processing Manual, Chapter 10 allows only four exceptions: a natural disaster, a system issue on the CMS or MAC side, a newly certified agency still waiting on its enrollment, or another circumstance the MAC agrees was beyond your control.

Because one NOA generally covers the patient’s entire admission, a substantially delayed NOA can affect payment for days—and potentially more than one 30-day period—that occur before the NOA is accepted. Once the NOA is accepted, the late-filing reduction does not continue into later periods simply because the original NOA was late. Therefore, agencies that treat the NOA as a day-one task, not a week-one task, can reduce avoidable payment losses. If your current biller misses this deadline more than once, it is worth reviewing alternatives on a medical billing company directory with verified client reviews.

LUPA Thresholds: The Silent Revenue Leak

A Low Utilization Payment Adjustment (LUPA) is the quietest way to lose money in home health. Under PDGM, each of the 432 case-mix groups carries its own LUPA threshold, ranging from two to six visits per 30-day period. If your agency delivers fewer visits than the threshold, Medicare pays a flat per-visit rate instead of the full case-mix payment. The difference often runs into hundreds of dollars for a single period.

So what triggers a LUPA in home health? Usually, it is not a clinical decision. Instead, a patient cancels, a nurse calls in sick, or a period closes on day 30 with one visit short. Furthermore, the first period of an admission includes a LUPA add-on payment for the initial visit, but later periods do not, which makes late periods even more sensitive to missed visits.

Successful agencies check each patient’s visit count against the LUPA threshold around day 20 of every period. That single review gives clinical managers time to reschedule, rather than discover the shortfall on the final claim.

The Top Causes of Home Health Claim Denials

Most claim denials in medical billing trace back to a handful of repeatable errors. In home health, the list looks like this:

Authorization missing or expired. Medicare Advantage and Medicaid managed care plans may require prior authorization, with approved services, visit counts, dates and renewal requirements varying by plan. Services delivered outside the approved authorization may be denied. Fix: track the authorized visit count and expiry date per patient, and start the renewal at 80 percent of the approved visits.

Lack of information on the claim. Claims go out without the referring physician’s NPI, the OASIS-based HIPPS code, the admission date, or the required occurrence codes. Fix: build a pre-submission scrub that rejects any claim with a blank required field.

Coverage terminated before the date of service. The patient’s plan changed, lapsed, or switched from traditional Medicare to a Medicare Advantage plan mid-admission, and the claim went to a payer that no longer covered them. Fix: re-verify eligibility at the start of every 30-day period, not just at admission.

Incorrect payer billed. The claim went to traditional Medicare when the patient had enrolled in a Medicare Advantage plan, or to the wrong MAC jurisdiction. Fix: check the Medicare Beneficiary Identifier and plan enrollment in the eligibility response before every submission.

OASIS not accepted in iQIES. CMS matches the final claim against the OASIS assessment. If the assessment is missing, rejected, or filed after the claim, the claim returns to the provider.

HIPPS code mismatch. Payment-related information on the claim must remain consistent with the applicable accepted OASIS assessment. A correction to OASIS data that changes information used for payment may require the claim to be corrected or adjusted.

Medicare Advantage authorization gaps. Many plans require prior authorization, but the authorization period and requirements vary. A missing or expired authorization can result in denied services or claims.

Period sequence errors. Billing a late period as early, or overlapping dates with another agency, triggers an automatic return.

Each of these errors is preventable. However, they only stay preventable when someone reviews home health billing codes and documentation before the claim leaves the office, not after the denial arrives. Agencies that pair that review with dedicated prior authorization services also close the Medicare Advantage gap before it turns into a denied period.

Medicaid and Commercial Payers: Where PDGM Rules Stop Applying

Everything above describes traditional Medicare, and PDGM governs only that payer. Medicaid and commercial plans cover a growing share of home health patients, and each one runs on different rules. An agency that bills every payer through its Medicare workflow sends the wrong unit of service, misses state requirements, and loses claims to deadlines it never knew existed.

Medicaid pays for home health through state programs and managed care plans, and requirements vary by state, program and plan. Depending on the service and payer, requirements may include electronic visit verification (EVV), prior authorization, specific plan-of-care documentation, provider qualifications and state-specific billing rules. A claim that satisfies Medicare requirements may therefore still fail to meet a Medicaid payer’s requirements. Keep a requirements sheet for each Medicaid program and managed care plan you bill and verify applicable documentation, authorization and EVV requirements before submitting the claim.

Commercial payers generally follow their own contract-specific reimbursement and authorization rules rather than Medicare’s PDGM methodology. Depending on the payer and contract, payment may be based on visits or other negotiated arrangements, and plans may impose authorization requirements, benefit limits and specific timely-filing deadlines. As a result, agencies that push commercial claims through the Medicare template bill the wrong revenue codes, exceed the authorized visit count, or file after the deadline. Build a separate billing template for each commercial contract that records its visit limits, authorization rules, and filing deadline, and verify the patient’s remaining benefit before every new period.

The practical rule is simple. Medicare billing runs on the calendar, Medicaid billing runs on the state manual, and commercial billing runs on the contract. Agencies that treat the three as one process lose revenue to all of them.

A Home Health Billing Checklist Agencies Can Run Every Week

Think of this as a home health billing cheat sheet for your operations team. It takes less than an hour a week, and it catches the problems described above while they are still fixable.

Day 1: Verify eligibility and queue the NOA. Confirm Medicare or Medicare Advantage coverage before the first visit, and submit the NOA the same day the start of care is confirmed.

Day 3: Confirm NOA acceptance. Check the MAC portal for acceptance, not just submission. A rejected NOA that nobody sees is still a late NOA.

Day 7: Audit the face-to-face and orders. Make sure the encounter note exists, the dates fit the window, and the plan of care is signed.

Day 20: Compare visits to the LUPA threshold. Flag every patient within one visit of the threshold and reschedule missed visits before day 30.

Before the final claim: Confirm that the applicable OASIS assessment has been accepted in iQIES and verify that payment-related assessment and claim information are consistent. Remember that OASIS recertification assessments remain on the 60-day certification cycle rather than occurring every 30-day PDGM payment period.

Every Friday: Review the denial log by root cause. Sort denials by reason, not by payer, and fix the process that created the top reason.

Agencies that follow home health billing guidelines this way turn billing from a monthly scramble into a predictable routine.

When In-House Billing Isn’t Enough

Some agencies run this checklist well with a two-person billing team. Others outgrow it. Watch for recurring warning signs: repeated late NOAs, an unexplained rise in LUPA periods, or continued growth in accounts receivable older than 90 days. Those patterns can indicate that the billing workload or processes need closer review.

When those signs appear, specialized home health billing services can track every episodic deadline, LUPA exposure, and OASIS match per patient, so clinical staff can focus on visits rather than portals. The goal is not to replace your team. Rather, it is to give them a process that scales with your census.

Conclusion

PDGM rewards accuracy and timing, not volume. Agencies that submit the NOA on day one, watch LUPA thresholds on day 20, and audit documentation before every final claim keep their revenue intact. Those that treat billing as an afterthought hand money back to Medicare every month. Choose the first path, and the rest of your operation gets easier.

Frequently Asked Questions

What is PDGM in home health?

PDGM is the Medicare payment model for home health that pays per 30-day period based on admission source, timing, clinical grouping, functional impairment, and comorbidities, rather than on the number of therapy visits.

What happens if a home health NOA is late?

Medicare reduces payment based on the days from the start of care until the NOA is submitted and accepted. An HHA may request an exception to the late-filing consequences when one of CMS’s qualifying circumstances applies.

What is a LUPA in home health?

A LUPA occurs when an agency provides fewer visits than the threshold set for that case-mix group. Medicare then pays a per-visit rate instead of the full period payment.

What is the difference between PDGM and PDPM?

PDGM applies to home health agencies and uses 30-day periods. PDPM applies to skilled nursing facilities and pays per day of a Part A stay. Both models replaced therapy-driven payment, but they use different variables.