Medicare Advantage Home Health: Authorizations, Rates and Denials That Do Not Work Like Traditional Medicare

Medicare open enrollment starts on October 15. By January, some of your traditional Medicare patients will be in Medicare Advantage plans, some MA patients will have switched plans, and a referral that would have been routine in December will need an authorization in January.

Medicare Advantage home health is the same benefit with a different gatekeeper. This guide covers the coverage rules MA plans must follow, what prior authorization can and cannot do, how rates work, why MA denials look different, and a pre-admission checklist.

How Big Medicare Advantage Home Health Has Become

In its March 2026 report, Medicare Advantage chapter, MedPAC reports that 55% of eligible Medicare beneficiaries were enrolled in MA in 2025, up from 54% in 2024 and 37% in 2018, about 34.9 million people. For most agencies, that means MA is no longer the exception in the referral queue. It is often half of it.

The timing matters too. Medicare.gov lists open enrollment as October 15 to December 7, with coverage starting January 1. A separate Medicare Advantage open enrollment period runs January 1 to March 31, when MA enrollees can switch MA plans or return to traditional Medicare. Coverage can change at the start of the year and again in the first quarter.

The Coverage Rules MA Plans Must Follow

Since the CMS-4201-F rule of April 2023, 42 CFR 422.101(b) requires MA plans to comply with national coverage determinations and with the general coverage and benefit conditions in traditional Medicare law. The regulation names home health services under 42 CFR part 409 as an example.

That has a direct consequence. The traditional Medicare eligibility tests, including being confined to the home and needing intermittent skilled services, apply to MA home health too. Plans apply those same tests; they cannot substitute a homebound definition of their own. The homebound status guide covers the two criteria and the evidence for each.

Plans may use internal coverage criteria only when Medicare criteria are not fully established, and those criteria must be publicly accessible, with the evidence and rationale behind them. If a plan denies home health using a criterion you cannot find in Medicare rules or in the plan's published criteria, ask for it in writing.

What Prior Authorization Can and Cannot Do

Under 42 CFR 422.138, coordinated care plans may use prior authorization only to confirm the presence of diagnoses or other medical criteria, to ensure a basic benefit is medically necessary under the standards in 422.101(c)(1), or to ensure a supplemental benefit is clinically appropriate.

Paragraph (c) is the one to remember. If the plan approved a service through prior authorization, it may not later deny coverage for lack of medical necessity, and may not reopen the decision except for good cause or reliable evidence of fraud or similar fault.

Decision timeframes are set in regulation:

• Standard requests subject to the prior authorization rules: beginning January 1, 2026, no later than 7 calendar days after the request, under 42 CFR 422.568(b). Other standard requests: 14 calendar days.
• Extensions: up to 14 more calendar days in specified circumstances, with written notice to the enrollee.
• Expedited requests: no later than 72 hours, under 42 CFR 422.572.

And under 42 CFR 422.566(d), a decision the plan expects to be partly or fully adverse on medical necessity must be reviewed by a physician or other appropriate health care professional with relevant expertise, including knowledge of Medicare coverage criteria, before it is issued.

Rates Are a Contract, Not a Default

For contracted agencies, payment follows the contract. Under 42 CFR 422.520(b), MA organizations pay contracted providers on the terms of their written agreement, which must include a prompt-payment provision. The rate might be per visit, per period or something else, and it may not resemble the home health PPS at all.

For non-contracted agencies, 42 CFR 422.214 requires a provider of services without a contract to accept, as payment in full, the amount it could collect if the beneficiary were in original Medicare. Under 422.520(a), the plan must pay 95% of clean claims from non-contracted providers within 30 days, and pay or deny other non-contracted claims within 60 calendar days.

Read every MA contract for five things before the first admission: how a "visit" or "unit" is defined, how authorization periods and reauthorizations work, timely filing limits, the appeal and dispute path, and whether rates are tied to a Medicare figure that changes each year.

Why MA Denials Look Different

OIG's 2022 report OEI-09-18-00260 reviewed a sample of MA denials. Among prior authorization requests that plans denied, 13% met Medicare coverage rules and likely would have been approved under original Medicare. Among denied payment requests, 18% met Medicare coverage and plan billing rules. OIG found causes including plan clinical criteria not contained in Medicare rules, requests for documentation when records were already sufficient, and human and system errors. Plans reversed some of these denials, often after the beneficiary or provider appealed.

The sample predates the 2023 rule, which addressed the criteria problem directly. The lesson still holds: an MA denial is a determination you can test against specific rules, not a final word.

A Worked Example: The Authorization That Ran Out

The figures are illustrative. A patient in an MA HMO is admitted on January 6 after a hospital stay. The plan approves eight skilled nursing visits from January 6 to February 4, and the plan of care orders two visits a week for four weeks plus PRN visits for a wound.

By January 22, two PRN wound visits have been added, so eight visits are used and the ninth is scheduled for January 26. Nobody requested more. The ninth and tenth visits are delivered, documented well and denied, because no authorization covered them.

The fix is a rule, not a better biller:

• Track authorized visits remaining on the schedule itself, next to the visit.
• Trigger a reauthorization request when 70% of approved visits are used, or 10 days before the end date, whichever comes first.
• Build in the plan's decision time. A standard request subject to the prior authorization rules can take up to 7 calendar days, plus up to 14 more if extended, so a request filed on day 21 of a 30-day authorization may not be decided before it expires.
• If the patient's condition makes waiting harmful, ask for an expedited decision and document why.

A Pre-Admission Checklist for MA Referrals

1. 1.Verify the plan at every admission, and again for every active patient in January.
2. 2.Confirm network status. Contracted, non-contracted, or out of network for an HMO enrollee.
3. 3.Confirm whether prior authorization is required, for which disciplines and how many visits or units.
4. 4.Record the authorization number, approved services, start and end dates, and the reauthorization date.
5. 5.Confirm traditional Medicare requirements are documented anyway: homebound status, skilled need, face-to-face encounter and the plan of care.
6. 6.Put authorized units where the scheduler can see them, so visits never run past the approval.

Working an MA Denial

1. 1.Read the reason and the cited criterion. If it is not a Medicare rule or a published plan criterion, say so in the appeal.
2. 2.Check for a prior approval. If the service was authorized, cite 422.138(c).
3. 3.Check who reviewed it. An adverse medical necessity decision should show review by an appropriate professional under 422.566(d).
4. 4.File on time. Under 42 CFR 422.582, a standard reconsideration request must be filed within 60 calendar days of receiving the written determination, and receipt is presumed 5 days after the notice date. Contracted providers should also follow any dispute process in their contract.
5. 5.Log the outcome by plan and reason. Patterns are leverage at contract renewal.

Where Systems Help

Most MA write-offs start upstream: a missed plan change, an authorization nobody could see, a visit scheduled past its end date. The denial guide explains why authorization denials are almost never billing errors. Nuraflow is being designed so that intake and referral management carries payer and authorization context into the case, and billing and revenue cycle management checks authorization before a claim leaves the agency.

This article is general information, not legal or billing advice. Confirm plan-specific rules with each MA organization, your contracts and your compliance advisor.