Home Health Medical Billing Requirements and PDGM Overview

Home health medical billing operates under a distinct regulatory and reimbursement structure that differs substantially from inpatient or outpatient facility billing. The Patient-Driven Groupings Model (PDGM), implemented by the Centers for Medicare & Medicaid Services (CMS) on January 1, 2020, replaced the prior Home Health Prospective Payment System (HH PPS) and restructured how Medicare payments are calculated for home health agencies (HHAs). This page covers the definitional scope of home health billing, the PDGM payment mechanism, common billing scenarios, and the boundaries that determine correct claim classification.

Definition and scope

Home health services under Medicare are defined by 42 CFR Part 484 as skilled care provided to homebound patients — those for whom leaving the home requires a considerable and taxing effort. Covered services include skilled nursing, physical therapy, occupational therapy, speech-language pathology, home health aide services, and medical social services.

Certification and billing eligibility hinge on several statutory criteria. The patient must be under the care of a physician or allowed practitioner, must be homebound as defined by the statute, and services must be provided by a Medicare-certified HHA. These criteria are codified in 42 CFR §409.42.

Home health billing under Medicare uses the UB-04 claim form (CMS-1450), distinct from the CMS-1500 form used for professional services. Revenue codes specific to home health — including Revenue Code 042x for Medical/Surgical Supplies and 055x for Skilled Nursing — appear on UB-04 submissions. HCPCS Level II codes are also required to identify specific services billed within each claim period. For a broader reference on code sets, see the HCPCS Level II Codes reference.

Medicaid home health billing requirements vary by state and are governed by individual state plan amendments under 42 CFR Part 440, meaning that covered services, prior authorization rules, and payment rates differ across programs. The medical billing for Medicaid reference page covers state-level variation in detail.

How it works

Under PDGM, CMS replaced the previous 60-day episode structure with 30-day payment periods. Each 30-day period is classified into one of 432 payment groups based on five variables:

1. Timing — whether the period is Early (the first 30-day period in a sequence of care) or Late (any subsequent period)
2. Admission source — Community (no prior institutional stay within the preceding 14 days) or Institutional (acute or post-acute facility discharge within 14 days)
3. Clinical grouping — one of 12 clinically coherent groupings derived from the principal diagnosis at the ICD-10-CM level (e.g., Musculoskeletal Rehabilitation, Behavioral Health, Complex Nursing Interventions)
4. Functional level — Low, Medium, or High, scored using OASIS assessment items
5. Comorbidity adjustment — None, Low, or High, determined by secondary diagnoses

The principal ICD-10-CM diagnosis drives clinical grouping placement and cannot be a symptom, sign, or manifestation code. This makes accurate ICD-10 coding critical at the point of plan-of-care establishment. CMS publishes the complete PDGM grouper logic and case-mix weights annually in the Home Health Prospective Payment System Final Rule, available through the CMS Home Health Center.

A Request for Anticipated Payment (RAP) was eliminated for most periods beginning in 2021 under the final rule published in the CY 2021 HH PPS update. HHAs now receive a single final claim payment per 30-day period once the period ends and the claim is submitted with complete OASIS data transmitted through the OASIS Assessment Submission and Processing (ASAP) system.

Prior authorization requirements do not broadly apply to standard Medicare home health, but CMS operates a pre-claim review demonstration in select states; HHAs in those states submit documentation before final claims adjudication.

Common scenarios

Scenario 1 — Early Community, Musculoskeletal: A patient is discharged from home (no recent institutional stay) following a knee replacement with a principal diagnosis in the musculoskeletal grouping. This classifies as an Early, Community, Musculoskeletal period. The functional and comorbidity scores determine the final case-mix weight applied to the national standardized payment amount.

Scenario 2 — Late Institutional, Complex Nursing: A patient remains on service beyond the first 30-day period following hospital discharge for a wound-care diagnosis. The second period classifies as Late, Institutional (if within 14 days of discharge), Complex Nursing Interventions. Late periods carry lower base payment weights than Early periods — reflecting CMS assumptions about declining resource intensity — which directly affects revenue projections for longer-stay patients.

Scenario 3 — Therapy-Only Certification: Under PDGM, therapy visit thresholds no longer affect payment weights, a structural change from the pre-2020 model. A certification based solely on physical therapy services is permitted, but functional scoring still applies through OASIS items.

Claim denial management in home health frequently involves OASIS timing errors, homebound status documentation gaps, and physician signature deficiencies on plans of care. The claim denial management reference outlines the general denial resolution framework applicable across payer types.

Decision boundaries

The distinction between home health billing and other inpatient vs. outpatient billing categories turns on the homebound criterion and the nature of services. Private duty nursing, custodial care, and home-based personal care that lacks a skilled care component do not qualify under the Medicare home health benefit as defined in 42 USC §1395x(m).

Key classification boundaries under PDGM include:

• Early vs. Late period: Determined solely by sequence position within a continuous home health episode, not by calendar time or visit count.
• Community vs. Institutional admission source: Requires review of prior 14-day inpatient, skilled nursing facility, inpatient rehabilitation, or long-term care hospital stay; the look-back window is fixed at 14 days from the home health start-of-care date.
• Principal diagnosis selection: Must reflect the condition most responsible for the home health services provided. Symptoms (e.g., R-codes in ICD-10-CM) placed as principal diagnoses cause grouper misclassification and are subject to medical billing audit compliance scrutiny.
• OASIS completion timing: The OASIS Start of Care (SOC) assessment must be completed within 5 calendar days of the start-of-care date per 42 CFR §484.55. Late submission affects functional scoring validity and can trigger claim adjustment.

Home health agencies that also bill durable medical equipment for the same patient must maintain separate billing tracks; DME claims route through Medicare Part B and carry distinct HCPCS codes and supplier enrollment requirements, not through the HH PPS episode.

For fraud and abuse risk, the OIG Work Plan consistently identifies home health as a high-scrutiny area, with documented concerns including therapy visit inflation (prior to PDGM), inappropriate homebound certifications, and OASIS score manipulation. The HHS Office of Inspector General maintains its annual Work Plan at oig.hhs.gov.

References

• Centers for Medicare & Medicaid Services — Home Health Agency (HHA) Center
• 42 CFR Part 484 — Home Health Services (eCFR)
• 42 CFR §409.42 — Conditions Patient Must Meet (eCFR)
• 42 CFR Part 440 — Medicaid Services (eCFR)
• 42 USC §1395x(m) — Home Health Services Definition (U.S. House Office of the Law Revision Counsel)
• HHS Office of Inspector General Work Plan
• [CMS OASIS Data Sets and Guidance](https://www.cms.gov/Medicare/Quality-Initiatives-Patient-Assessment-Instruments/HomeHealthQualityInits/OASIS-Data-