Quick answer
If you have both Medicare and CHAMPVA, Medicare generally pays first and CHAMPVA pays second. But there are two separate questions to keep straight:
- Are you still eligible for CHAMPVA once Medicare applies to you?
- In what order should your medical claims be billed?
For most current beneficiaries who are entitled to Medicare Part A, keeping CHAMPVA requires Medicare Part B as well. VA's current CHAMPVA benefits page states that people who qualify for Medicare generally need Parts A and B to get or keep CHAMPVA, and a Medicare Advantage plan (Part C) meets that requirement. Medicare Part D is not required for CHAMPVA eligibility.
The governing rule in 38 CFR § 17.271 contains important exceptions based on age, Part A entitlement, and whether the beneficiary was already age 65 before June 5, 2001. So the simple public-facing rule should not be used to erase those regulatory exceptions.
Once Medicare and CHAMPVA are both active, the ordinary claim sequence is:
Medicare → any applicable Medicare supplement or other payer → CHAMPVA
VA's current CHAMPVA Guidebook says Medicare should be billed first and that Medicare electronically forwards processed claims for CHAMPVA beneficiaries to VA. If another plan such as Medigap must pay before CHAMPVA, CHAMPVA processes after that plan as well.
Eligibility and claim order are different rules
A common source of confusion is treating Medicare enrollment and Medicare billing as the same issue.
Eligibility asks whether you meet the conditions to keep CHAMPVA. Medicare Part B can be an eligibility condition when you are entitled to Part A.
Coordination of benefits asks which payer processes a particular claim first. Under 38 CFR § 17.276, CHAMPVA is the last payer to other health insurance and is specifically secondary to Medicare under § 17.271(b).
That means having Part B is not simply a way to reduce your bill. For many CHAMPVA beneficiaries, Part B is part of the legal eligibility framework itself.
Which Medicare parts matter for CHAMPVA?
| Medicare status | General CHAMPVA effect |
|---|---|
| Under age 65 and entitled to Part A | Part B enrollment is required to retain CHAMPVA. Medicare pays first and CHAMPVA is secondary. |
| Age 65 on or after June 5, 2001, entitled to Part A | Part B is required to retain CHAMPVA. Medicare pays first and CHAMPVA is secondary. |
| Age 65 or older and not entitled to Part A | The regulation allows CHAMPVA eligibility to continue. VA requires proof of the Medicare status, including an SSA Notice of Disallowance when applicable. |
| Age 65 or older before June 5, 2001 | Special grandfather rules apply. Part B requirements depend on the beneficiary's Medicare status on that date. |
| Medicare Advantage (Part C) | VA says Medicare Advantage meets the Parts A and B requirement. The Medicare Advantage plan pays first and CHAMPVA is secondary. |
| Medicare Part D | Part D is not required to get or keep CHAMPVA. Prescription coordination has separate rules. |
If Medicare started before age 65, use the more detailed CHAMPVA and Medicare Before Age 65 guide.
If you are turning 65 or already 65+, use CHAMPVA and Medicare at Age 65 for the Notice of Disallowance, grandfather, and Part A edge cases.
For prescription coverage, see CHAMPVA and Medicare Part D.
How Medicare and CHAMPVA claims should flow
For ordinary Medicare-covered medical care, use this sequence.
1. Give the provider both Medicare and CHAMPVA information
Make sure the provider has your current Medicare information and your CHAMPVA information. If your Medicare coverage is new or changed, also make sure CHAMPVA has the same current coverage information.
VA says enrolled beneficiaries can update other insurance by submitting VA Form 10-7959C and a copy of the front and back of the Medicare card. ValorWell's step-by-step resource is How to Report Other Health Insurance to CHAMPVA.
2. The provider bills Medicare first
VA's current CHAMPVA care guidance says a provider should bill other health insurance first. For a Medicare beneficiary, that means Medicare or the Medicare Advantage plan processes the claim before CHAMPVA.
Do not ask a provider to send the same service to CHAMPVA as primary merely because CHAMPVA may cover costs Medicare leaves behind.
3. Medicare processes the claim
Medicare applies its own coverage and payment rules. A Medicare payment or denial does not by itself determine what CHAMPVA will do next. CHAMPVA still applies its own covered-benefit, allowable-amount, authorization, and exclusion rules.
4. The claim moves to CHAMPVA
The CHAMPVA Guidebook says Medicare electronically forwards processed claims for CHAMPVA beneficiaries to VA. This can reduce the need to file a separate secondary claim.
Still, do not assume every claim successfully crossed over just because Medicare finished processing it. Review the Medicare notice and watch for the CHAMPVA EOB. If CHAMPVA never receives the claim, you or the provider may need to submit the required billing information and the primary payer's EOB.
5. CHAMPVA determines any secondary payment
CHAMPVA then considers the remaining covered amount under its own rules. VA's current care page says CHAMPVA may cover costs that remain after Medicare pays, and it may cover some or all of the Medicare Part B deductible for outpatient care.
“Secondary” does not mean CHAMPVA automatically pays every dollar Medicare leaves behind. A service can still be noncovered under CHAMPVA, exceed the CHAMPVA allowable amount, require authorization, or otherwise fail a CHAMPVA payment rule.
What if you also have Medigap?
A Medicare supplement, usually called Medigap, changes the sequence.
The CHAMPVA Guidebook says CHAMPVA processes after the Medicare supplemental plan. The usual order is therefore:
Medicare → Medigap → CHAMPVA
VA also warns that a beneficiary with a Medicare supplemental plan may have to file a CHAMPVA claim with the required EOB information after the supplement has processed.
This is different from a policy purchased specifically to supplement CHAMPVA. Under CHAMPVA's general other-health-insurance rules, a CHAMPVA supplemental policy pays after CHAMPVA.
For the broader payer-order framework, see How CHAMPVA Works With Other Health Insurance.
What providers should know about billing Medicare first
A provider office handling a Medicare-and-CHAMPVA patient should treat the coverages as coordinated payers, not as interchangeable insurance cards.
A practical workflow is:
- Verify the patient's Medicare and CHAMPVA information.
- Bill Medicare or the Medicare Advantage plan first.
- Confirm the primary payer has adjudicated the claim.
- Confirm whether the claim crossed over to CHAMPVA.
- If it did not, submit the required claim information and primary EOB to CHAMPVA.
- If Medigap or another applicable plan is between Medicare and CHAMPVA, let that plan adjudicate before CHAMPVA.
- Do not bill the patient as though CHAMPVA had no secondary role until the applicable payers have processed the claim.
Provider acceptance is a separate question from payer order. VA says CHAMPVA has no general provider network and beneficiaries should ask whether a provider accepts CHAMPVA assignment. VA also states that hospitals and hospital-based providers that accept Medicare must accept CHAMPVA; the special legal rule is particularly important for inpatient hospital services. See When Medicare-Participating Hospitals Must Accept CHAMPVA for the scope of that rule.
What to report to CHAMPVA when Medicare starts or changes
Do not rely on claims crossover as a substitute for keeping CHAMPVA's insurance record current.
VA's current benefits page tells enrolled beneficiaries updating other health insurance to submit:
- a completed VA Form 10-7959C, CHAMPVA Other Health Insurance Certification; and
- a copy of the front and back of the Medicare card.
If Part D coverage applies, VA also requests the Part D card information.
Keeping the record current matters because VA says CHAMPVA reviews claims for OHI information and can stop payment when required OHI information is missing or when a new plan has been reported but not fully documented.
Common Medicare-and-CHAMPVA claim problems
Part B is missing or has ended
For a beneficiary whose CHAMPVA eligibility depends on Part B, a lapse can be more than a billing inconvenience. It can affect CHAMPVA eligibility itself.
If you are entitled to Part A and rely on CHAMPVA, do not cancel or decline Part B without first checking the rule that applies to your age and Medicare history.
CHAMPVA has outdated Medicare information
If CHAMPVA does not have current OHI information, claims can be stopped or denied while VA waits for the coverage details. Submit the current 10-7959C and Medicare card rather than assuming the programs will synchronize automatically.
CHAMPVA is billed before Medicare
When Medicare is primary, CHAMPVA generally cannot determine the secondary payment until the primary payer has adjudicated the claim.
The beneficiary assumes electronic crossover happened
Medicare crossover is helpful, but the safest practice is to review both payers' notices. If Medicare processed the claim and no CHAMPVA EOB follows, investigate rather than allowing the bill to age.
A Medigap EOB is skipped
If Medigap is part of the payer sequence, CHAMPVA processes after that plan. Sending the claim to CHAMPVA before the supplement has finished can leave the coordination incomplete.
A Medicare denial is treated as automatic CHAMPVA approval
CHAMPVA makes its own coverage determination. A Medicare denial can still be followed by CHAMPVA payment when the service is a CHAMPVA-covered benefit, but the denial itself does not create CHAMPVA coverage.
The office assumes every Medicare provider has the same CHAMPVA obligation
CHAMPVA assignment and Medicare participation are not identical concepts. The special Medicare-participating-hospital rule should not be turned into a blanket assumption about every independent outpatient physician. Confirm CHAMPVA acceptance with the provider.
A Medicare-and-CHAMPVA checklist
When both coverages apply, verify these items:
- I know whether I am entitled to Medicare Part A.
- I know whether Medicare Part B is active and whether my CHAMPVA eligibility requires it.
- CHAMPVA has my current Medicare information.
- My provider has both my Medicare and CHAMPVA information.
- Medicare or my Medicare Advantage plan is billed first.
- If I have Medigap or another payer, I know where it falls before CHAMPVA.
- I review the Medicare notice and CHAMPVA EOB rather than assuming crossover worked.
- I know that CHAMPVA applies its own coverage and allowable-amount rules after Medicare.
- I have not confused Medicare Part D with the Part A/Part B eligibility requirement.
If the records or payer order do not match
When Medicare, the provider, and CHAMPVA appear to have different information, collect the documents that show the actual coverage and claim history:
- Medicare card and effective dates;
- CHAMPVA ID information;
- any recent VA Form 10-7959C submission;
- Medicare or Medicare Advantage EOB/notice;
- any Medigap or other-insurance EOB;
- the provider's itemized bill; and
- the CHAMPVA EOB, if one was issued.
Then determine where the process stopped: eligibility record, primary adjudication, crossover, secondary-plan adjudication, or CHAMPVA processing. Fixing that specific handoff is usually more useful than resubmitting the same claim blindly.
If the issue is whether Part B is legally required for your situation, use the age-specific Medicare resources above and the current version of § 17.271 before making a coverage change.