Home Health Is Paid per 30-Day Period. The Diagnosis and the Visits Inside It Set the Rate.
Under PDGM an agency is paid for a 30-day period of care rather than for the visits inside it. The amount turns on the principal diagnosis and the clinical group it falls into, the admission source and the timing of the period, the functional impairment recorded on the OASIS assessment, and the comorbidities the record documents. The visits still decide the outcome, because a period that finishes under its LUPA threshold drops to a per-visit payment for the same clinical work. We handle the coding, the OASIS, the face-to-face documentation and the claim timing so each period is paid at the group it earned and submitted inside its window.
Why Home Health Periods Get Underpaid
A home health denial is rarely a coding opinion. It is a missing signature, a diagnosis that undersells the patient, or a visit count nobody watched until the period closed.
The face-to-face encounter cannot be tied to the certifier
Medicare requires the certifying physician to document that they, or an allowed non-physician practitioner, had a face-to-face encounter with the patient within 90 days before the start of care or 30 days after it. That documentation has to sit in the certifying physician's own record, or in an acute or post-acute record the certifying physician signs and incorporates into it. A hospital discharge summary nobody attested to, or an encounter dated outside the window, is a denial no clinical justification can repair after the fact.
The principal diagnosis does not carry the clinical group
PDGM sorts a period into one of 12 clinical groups from the principal diagnosis, and that group sits at the center of the payment logic. Agencies that default to ICD-10-CM symptom codes such as R55 for syncope, R26.2 for difficulty in walking, M25.561 for knee pain or E11.9 for diabetes without complications land in the lowest paying group no matter how unwell the patient is. The same pressure appears in the comorbidity adjustment, which needs secondary diagnoses documented as actively treated and relevant to the plan of care.
LUPA risk is invisible until the period closes
Every one of the 432 case-mix groups has a visit threshold, and those thresholds run from 2 to 6 visits. A period that ends below its threshold is paid per visit at the national rate for the discipline that delivered the care, which is a fraction of the case-mix amount for the same clinical work. The threshold is not printed on the claim, so agencies usually learn about it at remittance, one visit late, with no appeal available.
The OASIS and the visit notes describe different patients
Functional impairment recorded on the OASIS assessment drives case-mix, and it has to match what clinicians document in the home. When the assessment records independence with bathing and dressing while the aide notes read as full assistance, the agency has a problem either way: the group may be under-priced, or the record overstates independence to keep an old assessment consistent. Self-consistency across the OASIS, the plan of care and the visit notes is the only defensible position.
The claim misses the submission window
A home health claim is due within 30 days of the end of the 30-day period it covers, and payment is reduced for each day it arrives late until the window closes and nothing is paid at all. The Notice of Admission adds a second deadline at the other end of the period, because it has to be submitted within five calendar days of the start of care. Both dates are known in advance, and both are missed routinely when billing waits on documentation to arrive.
Homebound status and skilled need are asserted, not documented
Coverage turns on the patient being confined to the home, meaning that leaving requires a considerable and taxing effort, and on the care requiring a skilled nurse or therapist rather than a caregiver. Notes that repeat the word homebound without describing the patient's actual difficulty, or that record observations with no skilled intervention, are the reason additional documentation requests arrive weeks later and the reason periods are taken back. Home health aide visits carry their own condition, since the aide is covered only while skilled nursing, physical therapy, occupational therapy or speech pathology is also needed.
From OASIS Review to Paid Period in Five Stages
Everything in home health billing is dated. The work is built around the period calendar rather than around a monthly close.
Audit the OASIS against the claim
We compare each period's OASIS assessment, the primary and secondary diagnoses on the claim and the visit notes, then test whether the clinical group, the functional level and the comorbidity adjustment reflect what the record actually shows. LUPA exposure is mapped period by period, because an under-threshold period is predictable from the visit schedule before it closes rather than after.
Correct the diagnosis and grouping logic
Principal diagnosis selection moves off symptom codes and onto the condition that drove the plan of care, with sequencing that supports the group the patient belongs in. Secondary diagnoses are captured where the record treats and monitors them, which is what the comorbidity adjustment requires. Coding rules are written into intake so the OASIS, the plan of care and the claim describe the same patient.
Rebuild face-to-face and certification files
Missing encounters are requested from the certifying physician in the form Medicare recognizes, dated inside the window and attributed to the person who performed the encounter. Plans of care go back for signature where the physician's order is not in the record. Files that cannot be repaired are flagged as at risk instead of submitted hopefully, because a weak certification is the most expensive kind of denial an agency can carry.
Submit clean and answer the denials
Claims move inside the 30-day rule with the Notice of Admission tracked from the start of care. Additional documentation requests and denials are answered with the exact documents the contractor named: the encounter, the signed order, and the visit notes that establish skilled need. Appeals are filed where the record supports the service rather than on every denial in the pile, because appeal capacity is a finite resource.
Report period by period
A monthly view of case-mix index, LUPA rate, visit mix by discipline, days to submission, adjustment volume and appeal outcomes. Therapy utilization is reviewed alongside skilled nursing, since physical therapy, occupational therapy and speech pathology each carry documentation requirements that a utilization report by itself will not reveal.
The Work Inside Home Health RCM
Six workstreams built around the 30-day period rather than the calendar month.
OASIS and case-mix review
The assessment items that drive the functional level reviewed against the visit notes, with the assignment traced through all 432 case-mix groups.
Diagnosis coding and clinical grouping
The ICD-10-CM primary diagnosis selected to carry the right clinical group of the 12 available, with comorbidities captured where the record treats and monitors them.
Face-to-face and certification support
Encounter documentation obtained from the certifying physician inside the 90 day before and 30 day after window, with signed plans of care to match.
Notice of Admission and claim timing
The notice submitted within five calendar days of the start of care and the period claim inside 30 days of the period end, tracked per episode rather than per week.
LUPA control and visit utilization
Visit thresholds monitored through the period so a schedule that finishes one visit short does not become a per-visit payment. Skilled nursing, home health aide, physical therapy, occupational therapy and speech pathology visits all reviewed for their own coverage conditions.
Denial, ADR and appeal management
Additional documentation requests answered with the record the contractor named, and denials appealed where the certification and visit notes support the coverage decision.
What Changes When the Period Is Managed
Same patients, same clinicians and the same OASIS software. What changes is when each decision is made and who owns it.
| What changes | Without a process | With MedFactor |
|---|---|---|
| Payment unit | Managed as a 60 day episode | Worked as a 30 day period with its own thresholds |
| Principal diagnosis | Symptom codes such as R26.2 | The condition that drove the plan of care |
| LUPA thresholds | Discovered at remittance | Tracked through each period while visits can still be added |
| Face-to-face encounter | Requested after the denial | Obtained and dated inside the required window |
| Claim timing | Filed when documentation arrives | Filed inside the 30 day rule with the notice on time |
| Reporting | Billing totals by month | Case-mix index, LUPA rate and visit mix by discipline |
Home Health Billing Questions Answered
What agency directors and clinical managers ask before moving OASIS and claim work off a shared queue.
PDGM replaced the 60-day episode with a 30-day period of care and rebuilt case-mix adjustment around patient characteristics instead of therapy volume. The therapy thresholds that used to trigger a full assessment were removed, the comprehensive assessment is now required for every 30-day period, and each period is sorted into one of 432 case-mix groups by admission source, timing within the episode, the clinical group of the principal diagnosis, functional impairment and comorbidities. It applies to home health periods starting on or after 1 January 2020.
The OASIS supplies the functional impairment level that feeds case-mix, so the items describing how the patient bathes, dresses, transfers and walks are part of the payment determination rather than a quality measure alone. They have to be supported by the clinical record, because a functional level the visit notes contradict is a take-back whether it helped the agency or hurt it. That is why OASIS review and coding review belong in the same conversation.
A LUPA is the low utilization payment adjustment. When a 30-day period has fewer visits than its case-mix group's threshold, payment drops from the case-mix rate to a national per-visit amount based on the discipline that delivered the care. Thresholds run from 2 to 6 visits depending on the group. The remedy is operational rather than clinical, because the visit count is known in advance. We flag periods heading under their threshold while there is still time to deliver the visit the plan of care already orders.
The certifying physician, or an allowed non-physician practitioner such as a nurse practitioner, clinical nurse specialist, certified nurse midwife or physician assistant working with the certifying physician. The encounter has to occur within 90 days before the start of care or within 30 days after it, and the certifying physician has to document it in their own record or sign and incorporate the acute or post-acute record that contains it. The encounter also has to relate to the primary reason the patient needs home health care, which is where records from an unrelated visit fall short.
The patient has to be confined to the home, need intermittent skilled services, be under the care of a physician and have a plan of care that physician establishes and reviews. Homebound means leaving the home requires a considerable and taxing effort, so the record has to show the patient's actual difficulty rather than the word homebound on its own. Home health aide visits are covered only while skilled nursing, physical therapy, occupational therapy or speech pathology is also needed, so a period built on aide visits alone does not hold up.
No. The requirement for a preceding hospital or nursing home stay was eliminated, so a patient can start home health care from the community as long as the coverage conditions are met. Admission source still changes the payment, because a period that begins after an institutional stay is grouped differently from one that begins in the community, so the source recorded on the claim has to match the record. A miscoded admission source is a payment error in either direction.
Those are home visit codes rather than home health benefit codes. 99509 describes a home visit for assistance with activities of daily living and personal care, and 99600 is the unlisted home visit service used only when nothing more specific fits the service provided. Neither describes the skilled services Medicare buys through the 30-day period, so neither is billed alongside a period claim. Where a state Medicaid program, a waiver or a commercial plan covers private duty or attendant care, they can be the right codes, and those payers usually attach their own documentation and authorization requirements to them.
The claim for a 30-day period is due within 30 days of the end of that period, and payment is reduced for each day it is late until the window closes and no payment is made at all. The reduction is applied by the payment system, so an appeal will not restore it. The Notice of Admission carries the deadline at the other end of the period and has to be submitted within five calendar days of the start of care. That is why the submission calendar is tracked from the start of care rather than from the day the chart is complete.
Related specialties we bill for
The same code-level precision applies across the practice spectrum. See how we bill these related areas.
Sources and further reading
The rules these pages describe are published. Check them against the primary sources:
- CMS Physician Fee Schedule, which covers the published rates and payment rules behind most of the codes these pages discuss.
- CMS Physician Self-Referral (Stark Law), which covers the rules governing referrals between a practice and its own ancillary services.
- AAPC, which covers the coding and billing standards body whose credentialing most billers hold.
- HHS Office of Inspector General, which covers enforcement guidance on billing compliance and the areas it targets.
Find the periods that are already underpaid
Send us two quarters of OASIS assessments, claims and visit notes. We will show you your case-mix index against the diagnoses you have documented, the periods that fell under their LUPA threshold, the face-to-face files that will not survive an additional documentation request, and what the corrections are worth per period.