Home Health CPT Codes (and the HCPCS G-Codes You Actually Bill)

The single biggest source of confusion in home health billing is that two different entities bill for the same episode of care, on different claim forms, with different code sets.

1. The home health agency (HHA). A Medicare-certified HHA is paid under PDGM as a bundled 30-day period payment, submitted on an institutional claim (UB-04 / 837I) with Type of Bill 32x. The G-codes the agency reports (G0299, G0151, etc.) are visit-tracking line items inside the bundle — they do not each generate a separate fee-for-service payment. The dollar amount comes from the PDGM case-mix grouping built from the OASIS assessment, not from adding up visit codes. The agency also files a one-time Notice of Admission (NOA) at start of care; a late NOA reduces payment day-for-day.

2. The physician or non-physician practitioner (NPP). A doctor, NP, PA, or CNS who visits the patient at home or oversees the plan of care bills on a professional claim (CMS-1500 / 837P) using true CPT codes — home/residence E/M (99341-99350), care plan oversight (99339-99340) — plus the HCPCS certification codes G0180 (initial certification) and G0179 (recertification). These pay fee-for-service under the Medicare Physician Fee Schedule and are entirely separate from the agency's PDGM payment.

In our home health audits the most common revenue leak is a physician practice that signs dozens of plans of care but never bills G0180/G0179 or care plan oversight — leaving legitimate, separately payable revenue on the table — while the agency side struggles with late NOAs and OASIS-driven LUPA shortfalls. Treat the two billing worlds separately and you stop confusing one set of denials for the other. For agencies, our hospital billing services team owns the institutional side; for physician home visits and certifications, physician billing services handle the professional claim.

Under PDGM the agency reports each skilled visit by discipline using a HCPCS G-code paired with the appropriate revenue code on the 32x claim. These codes track utilization, support the Low Utilization Payment Adjustment (LUPA) thresholds, and document that the plan of care was delivered — but the payment is the bundled period amount, not a sum of these lines.

The mechanics that actually move the money:

• OASIS drives payment, not the G-codes. The Outcome and Assessment Information Set (OASIS) the clinician completes at start of care feeds the PDGM clinical grouping, functional impairment level, and comorbidity adjustment. Inaccurate OASIS scoring — not a missing G-code — is the most common cause of underpayment.
• LUPA thresholds. If the number of visits in the 30-day period falls below a clinical-group-specific threshold, the period is paid per-visit (LUPA) instead of the full bundle. Each G-code visit counts toward avoiding a LUPA; tracking visit counts against the threshold mid-period is essential to protect the period payment.
• 30-day periods, not 60-day episodes. PDGM split the legacy 60-day episode into two 30-day periods, each separately grouped and billed. Period timing (early vs. late) and admission source (community vs. institutional) are case-mix variables.
• Notice of Admission (NOA). Replaced the old RAP. One NOA per admission; filing it late reduces the period payment for each day of delay.

When a physician or NPP physically visits a patient in their private residence (home, assisted living, group home, custodial care, but not a SNF), they bill the Home or Residence Services E/M codes. CPT consolidated the old "domiciliary/rest home" series (99324-99337) into this single family effective 2023, so 99341-99350 now covers all home and residence visits. Like office E/M, level selection is driven by medical decision making (MDM) or total time on the date of the encounter.

(CPT deleted 99343 in 2023; the new-patient series now runs 99341, 99342, 99344, 99345.)

Documentation and rate notes:

• Place of service. Use POS 12 (Home) for a private residence, or POS 13 (Assisted Living Facility) / POS 14 (group home) as applicable. Picking the wrong POS is a frequent denial driver — see our POS 13 billing guide.
• MDM or time, your choice. As with all 2021+/2023+ E/M, you select the level by either MDM or total time on the date of service; you do not need both. Document whichever you used.
• Reimbursement varies by MAC and locality. CMS publishes the national RVUs; the actual allowed amount is the RVU times your locality's conversion factor under the Medicare Physician Fee Schedule. Verify the current-year allowable for your MAC rather than quoting a fixed dollar — home/residence E/M values are recalculated annually. For the documentation discipline that keeps these levels defensible, see our medical billing audit checklist.

These are the codes a physician bills for overseeing the home health plan of care — distinct from a face-to-face visit. They are frequently un-billed, which is pure lost revenue, because they pay for non-visit cognitive work the physician is already doing.

The distinction that gets these paid:

• G0180 vs. G0179. G0180 is the initial certification of a brand-new home health episode. G0179 is the recertification for each continuing 60-day episode after the first. Billing G0180 when a recert was due (or vice versa) is a common denial.
• G0181 vs. 99339/99340. For a Medicare patient under a certified HHA plan of care, the CPO code is G0181 (≥30 minutes/month). The CPT codes 99339/99340 are for care plan oversight of a patient in the home or a domiciliary/rest home who is not under the home health/hospice CPO benefit — do not bill both for the same patient-month.
• The face-to-face encounter requirement. Before certifying (G0180), Medicare requires a documented face-to-face encounter related to the primary reason for home health, performed within 90 days before or 30 days after the start of care, by the certifying physician or an allowed NPP. Missing or undated F2F documentation is the leading cause of certification denials.
• Time is the gate on CPO. G0181/G0182 and 99340 require 30+ minutes of oversight in the calendar month; 99339 covers 15-29 minutes. The minutes must be totaled and documented — phone calls with the agency, reviewing reports, adjusting orders, coordinating care. Undocumented time means the code is unbillable.

Because PDGM pays a case-mix-adjusted bundle, the agency's revenue is determined long before the claim drops — at the assessment. The five PDGM case-mix variables tell you where money is won or lost.

1. Timing — early (first 30-day period of a sequence) vs. late (any subsequent contiguous period); early periods generally group to higher weights.
2. Admission source — community (home/physician referral) vs. institutional (discharged from an acute or post-acute facility within 14 days); institutional carries higher weights.
3. Clinical grouping — the principal diagnosis maps the period into one of 12 clinical groups (MMTA, wound, neuro rehab, complex nursing, etc.). A non-specific principal diagnosis can land the claim in return-to-provider (RTP) status.
4. Functional impairment level — low / medium / high, derived from specific OASIS functional items (dressing, bathing, transferring, ambulation, prior functioning).
5. Comorbidity adjustment — none / low / high, based on secondary diagnoses that map to PDGM comorbidity subgroups.

These five combine into one of hundreds of HHRG / HIPPS case-mix groups, and the HIPPS code on the claim is what the Medicare Administrative Contractor prices.

Where agencies lose money:

• OASIS coding errors. Under-scoring functional items pushes the period to a lower functional level and a smaller payment; the OASIS, not the visit notes, drives the weight.
• Non-specific principal diagnosis. A symptom code or unacceptable principal diagnosis triggers an RTP — the claim is returned and cannot group until corrected, delaying cash for that period.
• LUPA. Falling below the clinical-group LUPA visit threshold flips the period to per-visit pricing, far below the bundle. Visit planning against the threshold protects the payment.
• Late NOA. A Notice of Admission filed after the 5-calendar-day window reduces the period payment for each day late — fully preventable.

The fix is upstream: accurate OASIS, a specific ICD-10 principal diagnosis, NOA on time, and visit utilization tracked against the LUPA threshold. This is the same first-pass discipline that drives a high clean claim rate, applied to the institutional side. Our revenue cycle management services own this loop end to end for agencies.

Home health denials split along the same agency-vs-physician line as the codes. The table maps the denial codes you will see most to the specific home health root cause and the fix.

Two home-health-specific patterns worth calling out:

• The F2F documentation denial. More certification (G0180) denials trace to face-to-face encounter documentation than to anything else — the encounter happened but was not dated, not tied to the home health primary reason, or not signed by the certifying provider. Build an F2F checklist into the certification workflow.
• The LUPA "denial" that is not a denial. A LUPA period is not denied — it is correctly paid per visit because the visit count was below threshold. The fix is operational (visit planning), not an appeal. Treating LUPAs as denials wastes appeal effort.

For a structured walk-through of categorizing and reworking these by code, see denial management in healthcare explained and how to reduce claim denials.

Clean home health billing depends on documentation that exists at the point of care, not retrofitted at the appeal. Use this as a pre-submission gate for both the agency and physician sides.

Agency (PDGM period claim):

• ☐ OASIS completed and accurate — functional items scored to reflect the patient's actual status; the assessment drives the case-mix weight.
• ☐ Specific principal diagnosis — an acceptable, specific ICD-10 that maps to a PDGM clinical group (not a symptom or unacceptable code that triggers RTP).
• ☐ Comorbidities captured — secondary diagnoses that qualify for the PDGM comorbidity adjustment reported on the claim.
• ☐ Notice of Admission filed within 5 days of start of care.
• ☐ Plan of care signed by the certifying physician/NPP; orders match the visits delivered.
• ☐ Visit utilization tracked against the LUPA threshold for the clinical group, with G-codes (G0299/G0300, G0151-G0153, G0155, G0156) reported per discipline.
• ☐ Homebound status documented — the patient meets Medicare's homebound criteria and the record shows why.

Physician / NPP (professional claim):

• ☐ Face-to-face encounter documented within 90 days before or 30 days after start of care, tied to the home health primary reason, by the certifying provider or allowed NPP — required before G0180.
• ☐ Correct certification code — G0180 for a new cert, G0179 for a recert, billed in the right window.
• ☐ Home E/M level supported by MDM or time on the date of service, with the correct POS (12, 13, or 14).
• ☐ CPO time totaled and documented — 30+ minutes for G0181/99340, 15-29 minutes for 99339, with the specific oversight activities logged.
• ☐ No double billing — the physician's separately payable services are not also reported by the agency inside the bundle.

We typically run this exact checklist as a pre-bill scrub during onboarding; the F2F line and the OASIS line catch the majority of preventable home health denials before the claim leaves. A periodic medical coding audit on the OASIS-to-diagnosis mapping protects the case-mix weight over time.

Three settings get conflated under "home" billing. Keeping them straight prevents the most common coding errors.

• Home health (this guide). Skilled, intermittent care for a homebound patient under a physician-certified plan of care, paid to the agency as a PDGM 30-day bundle (G-codes, TOB 32x) and to the physician for certification/oversight (G0180/G0179/G0181) and any home visits (99341-99350).
• Hospice. A separate Medicare benefit with its own per-diem levels and revenue codes; the physician CPO code is G0182, not G0181. A patient generally cannot have home health and hospice paying for the same condition at once.
• Office / clinic visit. Standard outpatient E/M (99202-99215) on the professional claim — not a home visit. Billing 99349 for an office encounter, or 99214 for a home visit, is a POS/E/M mismatch denial waiting to happen.

One more boundary: a physician visiting a patient in a skilled nursing facility does not use 99341-99350 — SNF visits have their own E/M family. The home/residence codes are strictly for private residences, assisted living, group homes, and custodial settings.

Where a practice straddles these settings, the cleanest model is to route institutional (agency) and professional (physician) claims to teams that own each code set, with a shared rule that no service is billed twice. That separation, plus the OASIS and F2F discipline above, keeps both halves of a home health episode fully and compliantly paid. Our home health billing services cover both the PDGM period claim and the physician certification/oversight revenue.