The GW modifier is a two-character HCPCS Level II code that tells Medicare a service is not related to a hospice patient’s terminal condition. It lets a Part B claim for unrelated care be paid in the normal way, even though the patient has elected hospice.
Adding the code takes seconds. The hard part is what stands behind it: a decision from the hospice, proof that you asked, and a claim built to match. This guide covers all three. It is written for any provider or supplier that bills for a hospice patient, not only physicians, and it explains who can use GW, how unrelated care is decided, how to build the claim, what to keep on file, and why claims fail.
GW Modifier at a Glance
| Item | Detail |
| Official descriptor | Service not related to the hospice patient’s terminal condition |
| Code type | HCPCS Level II modifier |
| Claim types | Part B professional and supplier claims. Facility claims may use condition code 07, depending on your MAC |
| Who can use it | Any physician, practitioner, therapist, laboratory, imaging provider, ambulance supplier, or DME supplier treating an unrelated condition |
| Who decides relatedness | The hospice, through its interdisciplinary group and plan of care |
| Effect on payment | None. Normal payment rules, deductible, and coinsurance apply |
| Filing limit | 12 months from the date of service |
| Hospice agency use | None. Hospices bill on their own institutional claims |
What Makes Care “Unrelated” to Hospice?
The Hospice Makes the Call
When a patient elects hospice, the hospice takes responsibility for the terminal illness and related conditions. Its interdisciplinary group develops the plan of care and determines which conditions fall under that responsibility. CMS has long expected hospices to provide virtually all the care a terminally ill patient needs, making unrelated care a narrow exception. This distinction also affects hospice modifier billing, particularly when determining whether the GV or GW modifier applies to a physician’s services. Neither the billing office nor an outside clinician independently determines which conditions are related to the terminal illness.
Why It Is Not Always Obvious
Three things blur the line. Chronic conditions such as diabetes, high blood pressure, and kidney disease may look separate, but hospices often treat them as related because they affect the patient as a whole. The list of related conditions can grow as the illness advances, so an answer that was true in spring may not hold in autumn. And the same event can go either way. A fracture from slipping on ice is often an accident, while a fracture from a fall caused by weakness from the illness may be related.
Some patterns help. Pain from the disease itself is related. Infections in patients with advanced lung or brain disease are often related. A new eye, skin, or injury problem with no link to the illness is often unrelated. These are patterns, not rules, and only the hospice can classify a condition for a specific patient.
The Election Statement Addendum
A patient or representative can ask the hospice for a written addendum to the election statement. It lists the conditions, items, services, and drugs the hospice considers unrelated, with its reasons, and CMS sets time limits for providing it. A copy in your file is the strongest proof you can hold.
When the Hospice Says It Is Related
If the hospice determines that a condition is related to the terminal illness, the GW modifier does not apply. The hospice generally arranges and pays for related care, and outside providers typically bill the hospice under an agreement. An exception applies to eligible services furnished by an independent attending physician, who may bill Medicare using the GV modifier.
A patient who disagrees can ask the Beneficiary and Family Centered Care Quality Improvement Organization (BFCC-QIO) for a review, or can revoke hospice and return to regular Medicare.
Which Providers and Suppliers Use the GW Modifier?
| Provider or supplier | What to know |
| Physicians, NPs, and PAs | Use GW for unrelated visits and procedures, including the attending’s unrelated care. |
| Emergency departments and hospitals | Professional claims use GW. Facility claims may need condition code 07, a line modifier, or both. Follow your MAC. |
| Ambulatory surgery centers | The surgeon and the facility fee both need the modifier for unrelated surgery. |
| Laboratories and imaging centers | They cannot see the patient, so the ordering provider must pass on the hospice status. Imaging lines may also carry 26 or TC. |
| Ambulance suppliers | Unrelated transport needs GW with the origin and destination modifier. Confirm the order with your MAC. |
| DME suppliers | GW goes with rental or purchase modifiers such as RR or NU. |
| Therapy providers | Add GW to the required therapy modifier, GP, GO, or GN. |
| Skilled nursing and home health | Institutional claims for unrelated care may use condition code 07. Coordinate with the hospice and your MAC. |
| Pharmacies | No GW on Part D claims. See the Part D note below. |
Confirming and Documenting Unrelated Care
Start by learning that the patient is in hospice. Ask at scheduling, check eligibility, and read the referral. Then call the hospice and ask a direct question about the condition you are treating. Here is a call you can adapt.
| Sample call to the hospice “This is [name] from [practice]. I am calling about [patient], who is on your service. We are treating [condition]. Does your team consider it related to the terminal illness? If it is unrelated, could you confirm by email, and may I note your name and today’s date?” |
If the answer is unrelated, put it where every biller downstream will see it. On an order or lab requisition, add a line such as: “Hospice patient with [hospice name]. Service is for [condition], confirmed unrelated to the terminal illness on [date].” In the visit note, record who you spoke with, when, and that the visit addresses only the unrelated condition.
Keep four records together: the call log, the addendum or written confirmation, your eligibility check showing the election date, and the visit note. If a reviewer asks how you knew the care was unrelated, those four items answer the question.
How to Bill the GW Modifier
Add GW to every line for the unrelated service, not just the first line. When a line carries other modifiers, list those that affect payment first and GW after them, in the order your MAC publishes. List the unrelated condition as the first diagnosis. If the terminal illness appears first, a reviewer will question the modifier.
GW does not change what Medicare pays. The patient still owes the Part B deductible and 20 percent coinsurance, which a Medigap plan usually covers, and the service must still meet normal coverage and medical necessity rules. File within 12 months of the date of service.
Sample Claim
A patient on hospice for end stage kidney disease has a changing skin lesion. The hospice reviewed it and confirmed it is not related to kidney disease. A dermatology practice examines the patient and takes a biopsy. A pathology lab reads the sample and bills separately.
| Billed by | Date of service | POS | CPT | Modifiers | Diagnosis |
| Dermatology practice | 10/05/2026 | 11 | 99203 | 25, GW | D49.2 |
| Dermatology practice | 10/05/2026 | 11 | 11102 | GW | D49.2 |
| Pathology laboratory | 10/07/2026 | 81 | 88305 | GW | D49.2 |
Unrelated Care in Practice: Three Short Cases
The Requisition That Stayed Silent
A nursing facility resident on hospice for advanced prostate cancer injures a foot against a wheelchair. The physician orders a portable x-ray. The order does not mention hospice, so the imaging supplier bills Medicare with no modifier and the claim is denied. The supplier sends a hospice call log back to the practice, receives the confirmation, and corrects the claim. A single line on the order would have prevented three weeks of rework.
The Infection That Was Not Unrelated
A patient with advanced dementia on hospice keeps developing urinary infections. A urology office assumes this is separate from dementia and prepares to bill with GW. The biller calls the hospice first. The hospice says recurring infections are part of the dementia plan of care and offers to arrange the visit itself. The office does not bill Medicare with GW and avoids a claim that could have been recouped.
The Lesion That Was Unrelated
The dermatology case above shows the clean version. The hospice answered in writing, the practice kept the email, the requisition told the lab, and all three claim lines carried GW. Every party along the chain had what it needed.
Special Situations That Affect GW Claims
Election, Revocation, and Discharge Dates
GW applies only on dates inside the election. A visit before the election, or after the patient revokes hospice or is discharged, is a normal claim with no hospice modifier. If the hospice’s notice posts late in Medicare’s system, a claim paid earlier can be adjusted, so recheck status when you bill and when you work older accounts.
Visits That Mix Related and Unrelated Problems
You generally cannot bill two evaluation and management services for one visit, so you cannot split it into a related line and an unrelated line. Document what you addressed and ask your MAC how it wants these visits reported.
Drugs Under Part D
Pharmacy claims do not carry GW. Part D plans review drugs for hospice enrollees to decide whether a drug is related, and they may require prior authorization for certain types. If a prescription for an unrelated condition is rejected, the prescriber may need to request a coverage review and share what the hospice said.
Medicare Advantage, Medicaid, and Commercial Plans
When a Medicare Advantage member elects hospice, Original Medicare generally pays for the hospice and related care, while the plan may still handle unrelated care. Your claim may go to the plan under its own rules, not to your MAC. Medicaid and commercial plans have their own hospice policies, and some do not use GW. Call before you bill and save the answer.
GW or GY?
GY marks an item or service that is statutorily excluded or is not a Medicare benefit, and providers often use it to get a denial that a secondary payer needs. GW is for covered services where hospice status is the only issue. Using GY for covered unrelated care slows payment.
Why GW Claims Deny or Get Recouped
Work backward from the remittance advice. When a denial identifies hospice enrollment, review each claim line for a missing modifier and verify that the date of service falls within the hospice election period. A paid professional claim alongside a denied facility claim may indicate that the facility omitted condition code 07 or the required line modifier. Similarly, a denied lab or supplier claim may point to a missing hospice reference on the order. In cases where Medicare initially pays a claim but later recoups the payment, investigate whether the documentation supports the services as unrelated to the terminal illness.
Check the group code first. Denials from a missing or wrong modifier usually carry a CO group code, which puts the liability on the provider, so you cannot bill the patient. For a clerical fix, ask your MAC whether it prefers a corrected claim or a reopening. For a disagreement, request a redetermination within 120 days of the initial determination. If you still disagree, request a reconsideration by a Qualified Independent Contractor within 180 days of the redetermination.
Track GW denials as a category of their own. When most come from missing modifiers, your front end needs attention. When most come from relatedness, your hospice communication needs it. Strong revenue cycle management services build this tracking in, so each cause gets its own fix.
How Reviewers Look at GW Claims
Reviewers compare three things: your claim, the hospice record, and your note. They check whether your diagnosis matches the terminal diagnosis, whether the service sounds like palliative care, whether the date falls inside the election, and whether you can show the hospice agreed. Federal oversight reports have found Medicare payments for hospice patients that should have been covered by the hospice, so this area gets attention.
Patterns draw questions faster than single claims. Using GW on nearly every hospice claim, or on claims whose lead diagnosis matches the terminal illness, invites a closer look. A short quarterly check helps. Regular medical billing audits can be small: pull the quarter’s GW claims, confirm the call is logged, the diagnosis is unrelated, GW sits on every line, the date is inside the election, and payment is posted correctly. Then look for hospice patients’ claims with neither GV nor GW, which point to missing modifiers or the wrong payer. Return any overpayment within the period Medicare requires.
Five GW Myths Worth Dropping
| Myth | Fact |
| Every claim for a hospice patient needs GW | Only unrelated care does. Related care from the attending uses GV, and related care from others goes to the hospice. |
| The treating clinician decides what is unrelated | The hospice decides. Your clinical view helps the conversation but does not override it. |
| GW changes how much Medicare pays | It does not. It lets the claim process correctly. |
| Once unrelated, always unrelated | Relatedness can change as the illness changes. Reconfirm for care that continues. |
| A paid claim is a correct claim | Medicare can recoup payment later if relatedness or records do not hold up. |
Key Takeaways for Your Billing Team
The GW modifier is a short code that carries a long chain of facts: the patient is in hospice on that date, the hospice agrees the care is separate from the terminal illness, and your claim and records say so. Get the answer before you bill, put it in writing, and let it travel with the patient to every lab, supplier, and facility involved.
Let PHCS Help You With Hospice Claims for Unrelated Care
Proactive Healthcare Services (PHCS) is a medical billing company that helps practices, labs, and suppliers keep hospice claims clean. Our hospice medical billing support includes hospice status checks, calls to confirm relatedness, correct use of GW and GV, and follow up on every denial.
