How to Bill G0179 and G0180: The Complete Guide to Home Health Certification Codes

When a home health agency sends you a plan of care to sign — usually on a CMS-485 form — reviewing and signing it is not free administrative labor. Medicare recognizes physician certification and recertification of home health services as billable work under two HCPCS Level II codes: G0180 for the initial certification and G0179 for each recertification.

Most physician offices either do not bill these codes at all or bill them inconsistently, leaving real revenue on the table for work they are already doing. This guide covers when each code applies, what documentation Medicare expects, how to submit the claim, and the mistakes that trigger denials.

What G0180 covers: initial home health certification

G0180 is defined as physician (or allowed practitioner) certification for Medicare-covered home health services under a home health plan of care, with the patient not present. It is billable when a patient begins a new episode of home health — specifically, when the patient has not received Medicare-covered home health services for at least 60 days.

The service bundled into G0180 includes more than the signature itself:

• Review of the initial or subsequent reports of patient status
• Review of the patient’s responses to the OASIS assessment
• Contact with the home health agency to ascertain the initial implementation of the plan of care
• Documentation of the review in the patient’s record

What G0179 covers: recertification every 60 days

G0179 applies when you sign a subsequent certification after the patient has received home health services for at least 60 days (one certification period). It may be reported only once every 60 days — the only exception is the rare case where the patient starts a new episode before 60 days elapse and requires a new plan of care.

The two codes are not interchangeable. Billing G0180 when the patient is already on service — or G0179 for a brand-new episode — results in a denial, and correcting it usually means a full resubmission. One simple rule of thumb: new episode after a 60+ day gap means G0180; everything after that, once per 60-day period, is G0179.

Who can bill these codes

Physicians, nurse practitioners, clinical nurse specialists, and physician assistants can all bill G0180 and G0179, provided they are the practitioner performing the clinical review and signing the plan of care. The claim goes out under the certifying practitioner’s own NPI. A countersignature on the agency’s form without evidence of actual clinical review is not sufficient.

Documentation Medicare expects

To support a clean claim — and survive a records request — your chart should contain:

• A signed and dated plan of care (commonly the CMS-485, though any format containing the required data elements is acceptable)
• Documentation of a face-to-face encounter within 90 days before or 30 days after the start of care (for initial certification)
• Evidence that you reviewed the patient’s clinical status — a brief note such as “Plan of care and patient chart reviewed; problems, medications, and treatments remain accurate; care plan approved” is sufficient
• Documentation of medical necessity and homebound status supporting the home health episode

How to submit the claim (CMS-1500 rules)

These codes have submission requirements that differ from ordinary E/M billing, and claims that ignore them are denied outright:

• Bill G0180 or G0179 with 1 unit of service — never both for the same certification event
• Enter the home health agency’s provider number in Item 23 of the CMS-1500 form (or the electronic equivalent)
• The date of service is the date you completed and signed the plan of care (for G0179, the date you completed the review) — never a span of dates
• The place of service should reflect where the plan development and review occurred — typically POS 11 (office)
• Do not bill other services on the same claim form
• The patient is not present for this service, and does not need to be

What they pay

Reimbursement varies by locality, but G0180 typically pays in the range of $50–65 and G0179 in the range of $40–55 under the Medicare Physician Fee Schedule. For an office managing 40–60 home health patients, that is meaningful recurring revenue for work already being performed. Both codes are also excluded from the global surgical package, so they remain separately billable during a global period.

Related codes worth knowing: G0181 covers home health care plan oversight when you spend 30 or more minutes in a calendar month supervising a patient’s home health care, and G0182 is the hospice equivalent. These are time-based and separate from certification.

The denials to avoid

The most common reasons G0180 / G0179 claims are denied:

• Billing G0180 for a patient already on service (should be G0179), or vice versa
• Billing G0179 more than once in a 60-day certification period
• Missing or invalid home health agency provider number in Item 23
• Using a date range instead of the single date the plan was signed
• No evidence of clinical review in the record — a bare signature is not enough
• Bundling the certification with other services on the same claim

How Klio makes this automatic

The hard part of billing these codes has never been the rules — it is the tracking. Which patients were certified last month? Which were recerts? Where is the signed evidence if an auditor asks?

Klio generates a timestamped, hashed evidence trail the moment a physician signs a certification or recertification, and delivers a monthly billing report listing every patient eligible for G0180 or G0179 with the supporting evidence PDF attached. Your billing team submits through your normal claims process. Offices that have never billed these codes are typically comfortable after one 15-minute walkthrough.