What is the Medicare PDGM for home health?

PDGM is Medicare’s home health payment system effective January 2020 that pays in 30-day periods classified into 432 payment groups based on five variables: admission source, timing, clinical grouping from the primary diagnosis, functional impairment from OASIS, and comorbidity adjustment from secondary diagnoses. It replaced the prior system that paid largely based on therapy visit counts. Under PDGM, payment is driven by clinical and functional classification rather than utilization volume — fundamentally changing what documentation and coding practices determine revenue.

What is a LUPA and how do you prevent it?

A LUPA occurs when visits in a 30-day period fall below the PDGM group’s threshold (2-6 visits), converting the full period payment to a lower per-visit rate — often producing a fraction of the period payment. Patient-driven LUPAs from hospitalization, patient refusal, or genuine clinical improvement are unavoidable and should be documented. Operational LUPAs from scheduling failures are preventable through weekly LUPA risk tracking that identifies patients approaching the threshold with insufficient visits remaining and triggers clinical coordinator intervention before the period closes.

Why is the primary diagnosis the most important PDGM variable?

The primary diagnosis determines the clinical grouping — one of six categories that carry materially different payment weights. A patient correctly classified in the wounds grouping versus the MMTA grouping based on the same underlying clinical picture may have a period payment that differs by hundreds of dollars. The primary diagnosis must be the condition primarily responsible for home health services, coded at the highest available specificity, and supported by the physician’s plan of care. It cannot be a symptom code, a Z-code as primary, or a manifestation code without its required etiology code.

What is the comorbidity adjustment in PDGM?

The comorbidity adjustment increases the PDGM period payment when qualifying secondary diagnoses from CMS-defined lists are coded on the claim. Low adjustment applies for one qualifying secondary diagnosis; high adjustment applies when secondary diagnoses qualify from two different interaction pairs. It is the most commonly undercaptured PDGM variable because conditions that qualify for adjustment but aren’t coded on the claim produce zero adjustment even if the patient has those conditions. Systematic review of active secondary conditions against the comorbidity lists before claim submission is the process that captures this adjustment consistently.

How does OASIS accuracy affect PDGM payment?

OASIS functional item responses directly determine the functional impairment level variable — low, medium, or high — which affects the PDGM payment group and rate. An OASIS that understates functional impairment assigns the patient to a lower-paying tier than the patient’s actual status warrants. OASIS responses must reflect the patient’s actual status at the time of assessment under the standardized item guidance — not their best day, their historical function, or the clinician’s expectation of their recovery trajectory. Inter-rater reliability training that reduces clinician scoring variability produces more accurate and more consistent functional impairment classifications across the agency’s caseload.

How does home health billing for Medicare Advantage differ from traditional Medicare?

Medicare Advantage plans may use PDGM-aligned payment or may apply their own per-visit rates, episode limits, and authorization requirements that differ from traditional Medicare. An agency cannot assume MA coverage follows traditional Medicare rules. Each MA plan’s home health benefit must be verified at admission: what authorization is required, what visit limits apply, what the payment structure is, and what documentation standards the plan imposes. Claims submitted under traditional Medicare rules to an MA plan that applies different standards generate denials that accurate Medicare billing would not have produced.

Home Health Billing: Medicare PDGM Explained for Providers

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