Home health billing under the Patient-Driven Groupings Model (PDGM) rewards accurate diagnosis coding and comprehensive OASIS documentation—errors in either cascade into underpayment across entire 30-day payment periods. VeriMedix delivers the PDGM expertise, OASIS oversight, and physician-billing coordination that home health agencies need to maximize compliant revenue.
The Patient-Driven Groupings Model (PDGM), effective January 1, 2020, replaced the previous episode-based Prospective Payment System (PPS) with 30-day payment periods classified across 432 possible payment groups. Each period is categorized by admission source (community or institutional), timing (early: first period following an admission; late: all subsequent periods), primary diagnosis clinical grouping, functional impairment level derived from OASIS scores, and comorbidity adjustment (none, low, or high). The primary diagnosis selected at the time of the OASIS Start of Care (SOC) assessment directly determines the clinical grouping and is the single most important coding decision in home health billing. Using a symptom code or an unspecified code instead of the specific condition etiology code can result in assignment to a lower-paying 'MMTA' (Medication Management, Teaching & Assessment) group rather than a higher-acuity specialty group.
OASIS (Outcome and Assessment Information Set) is both a clinical assessment instrument and the data source that drives PDGM reimbursement. Accurate completion of OASIS items—particularly those measuring functional impairment (M1800 series, M2200) and the primary diagnosis—is essential. Underscoring functional items decreases the functional impairment level and reduces payment; overscoring creates compliance risk. Comorbidity adjustments require documenting qualifying secondary diagnoses from two or more of the approved comorbidity subgroups to achieve a 'high' comorbidity designation. The face-to-face encounter requirement mandates that a physician or approved NPP document the patient's homebound status and clinical need for skilled services within 90 days before or 30 days after the start of care; claims cannot be paid without this documentation on the certification.
Physician billing for home health oversight is a distinct revenue stream often missed by practices. G0180 covers physician certification of a new plan of care (patient not seen for Medicare home health for at least 60 days); G0179 covers recertification of a subsequent plan of care every 60 days. G0181 covers physician care plan oversight (CPO)—at least 30 minutes per calendar month of active care coordination that goes beyond administrative functions—and is billable monthly for complex patients. These codes are billed by the certifying physician on a CMS-1500 form, not by the HHA. The HHA must provide the physician with the completed CMS-485 and supporting documentation to facilitate coding and billing.
Below are commonly billed codes our certified coders manage for home health practices. Always confirm payer-specific coverage and current code values.
| Code | Description | Billing note |
|---|---|---|
G0179 | Physician recertification for Medicare home health services under a home health plan of care (patient not present) | Billable every 60 days after initial certification; once the patient has already received 60+ days of HH services |
G0180 | Physician certification for Medicare home health services under a home health plan of care (patient not present) | Billable when patient has not received Medicare-covered HH services for at least 60 days (new episode) |
G0181 | Physician care plan oversight of a patient under a home health agency care plan (≥30 min/month) | Billable once per calendar month; document dates and minutes; requires active HH coverage and prior face-to-face E/M within 6 months |
G0182 | Physician care plan oversight for a patient under a hospice care plan (≥30 min/month) | CPO for hospice patients; same 30-min threshold as G0181 |
99213 | Office or outpatient E/M – low MDM (used for face-to-face encounter documentation) | The qualifying face-to-face encounter is billed as a standard E/M; must be within 90 days before or 30 days after SOC |
M0110 | OASIS item: Admission/Discharge/Transfer source | Critical for PDGM institutional vs. community admission source classification |
97110 | Therapeutic exercises (physical therapy) – used in home health PT claims | Billed per 15-min unit; OASIS functional scores must support medical necessity |
92521 | Evaluation of speech sound production (speech-language pathology) | Separately billable home health SLP evaluation; requires skilled care documentation |
Our standard operating procedures for home health revenue cycle management — the step-by-step workflow we follow on every claim:
These are the issues we see most often in home health billing — and exactly how we resolve them:
Using Z codes, unspecified codes, or symptom codes (e.g., R26.89 – gait abnormality) instead of the specific etiology (e.g., G35 – multiple sclerosis) places the episode in a lower-paying MMTA group. Fix: train clinical staff and coders to always trace the primary diagnosis to the most specific ICD-10 etiology code; implement OASIS coding review before locking.
Claims are denied when the CMS-485 or its addendum lacks the required narrative describing how the clinical encounter supports homebound status and need for skilled services. Fix: provide physicians with a standardized face-to-face narrative template; build a workflow to confirm documentation is complete before releasing the certification for signature.
Clinicians scoring functional items too conservatively (lower impairment than observed) reduce the functional impairment level and the resulting PDGM payment rate. Fix: conduct quarterly inter-rater reliability audits on OASIS functional items; provide staff training aligned with CMS OASIS Guidance Manual updates.
Discrepancies between the therapy minutes in the treatment records and those reported in assessments trigger claim adjustments and RAC audits. Fix: implement daily therapy visit logging with real-time verification against the treatment plan before OASIS lock; conduct monthly reconciliation.
Many certifying physicians do not know CPO codes exist, leaving legitimate monthly reimbursement on the table. Fix: VeriMedix proactively identifies eligible patients, generates monthly CPO documentation templates, and assists physician practices in submitting G0181 claims after the calendar month closes.
Verimedix works inside the systems home health practices already use, including:
PDGM (Patient-Driven Groupings Model) is CMS's home health payment methodology, effective January 2020. It classifies each 30-day payment period into one of 432 payment groups based on five factors: admission source (community vs. institutional), timing (early vs. late period), primary diagnosis clinical grouping, functional impairment level from OASIS, and comorbidity adjustment. The combination of these factors produces a HIPPS code that drives the base payment rate, adjusted for geographic wage differences.
The certifying physician (or, since COVID-era waivers, an approved NPP) must have seen the patient in person or via telehealth within 90 days before or 30 days after the start of care. The encounter must be documented with the date and a narrative supporting homebound status and need for skilled services. As of Palmetto GBA's May 2025 clarification, providers within the same practice as the certifying physician may conduct the face-to-face without requiring a separate collaboration note.
These codes are billed by the certifying physician, not the HHA. G0180 (certification, new episode) is billed when the patient has not received Medicare HH services for ≥60 days. G0179 (recertification) is billed every 60 days after initial certification. G0181 (care plan oversight) is billed monthly when the physician spends ≥30 minutes on care coordination activities—reviewing reports, contacting the HHA, adjusting the plan—and the patient has been seen face-to-face in the preceding 6 months.
Yes. Medicare home health does not restrict the patient from receiving separate physician office visits or other Medicare Part B services. The homebound requirement means leaving home requires considerable effort; it does not prohibit medical appointments. Office visits, outpatient therapy, and adult day programs are permissible without disqualifying homebound status.
A comorbidity adjustment increases the payment rate when a patient has qualifying secondary diagnoses. A 'low' comorbidity adjustment requires one qualifying secondary diagnosis from the approved subgroup interactions list. A 'high' adjustment requires two or more secondary diagnoses from two separate approved subgroups. Accurate ICD-10 coding of all active conditions on the OASIS and the claim is essential to capturing the full comorbidity adjustment.
RAPs were the advance payment mechanism under the old PPS system. CMS eliminated RAPs effective January 1, 2022, replacing them with a Notice of Admission (NOA). HHAs must submit the NOA within 5 calendar days of the start of care to avoid a per-day payment reduction (1/30 of the expected payment for each day late). The final claim is submitted after the 30-day period ends.
Leading platforms include Homecare Homebase (HCHB), Axxess Home Health, WellSky Home Health (formerly Brightree), Netsmart myUnity, and MatrixCare Home Health. Larger integrated health systems may use Epic or Cerner with home health modules. Choosing a platform with built-in OASIS guidance, HIPPS code generation, and NOA tracking is critical under PDGM.
Verimedix handles the entire home health revenue cycle — coding, submission, denials, and A/R — so your team can focus on patients.