Medicare Advantage credentialing — why it takes longer than traditional Medicare and what to do about it

Medicare Advantage has been eating traditional Medicare’s market share for a decade. In most metropolitan markets, 40 to 60 percent of Medicare beneficiaries are now enrolled in an MA plan. For a practice that sees Medicare-aged patients, that split is not academic — it determines whether you can bill for the patients in front of you.

Here is the part that surprises most providers and practice managers: being enrolled in traditional Medicare via CMS does not enroll you in any Medicare Advantage plan. Not one. PECOS credentialing and MA credentialing are separate processes with separate timelines and separate approval loops.

How the credentialing split works

Traditional Medicare is administered by CMS. When you enroll via PECOS and receive a PTAN, you’re approved to bill CMS directly for fee-for-service Medicare patients.

Medicare Advantage plans are administered by private insurers — UnitedHealthcare, Humana, Aetna, CVS/Aetna, Cigna, Elevance, and dozens of regional and DSNP plans. Each plan holds a contract with CMS to serve Medicare beneficiaries, but each plan credentials its own provider network independently.

When an MA beneficiary comes to your office, their card says the plan name, not “Medicare.” The claim goes to UnitedHealthcare or Humana, not to CMS. If you’re not credentialed with that plan, the claim is out-of-network — or denied entirely.

This creates a credentialing sequencing problem that practices routinely underestimate.

The timeline compounding problem

Traditional Medicare via PECOS: 60 to 90 days.

Each Medicare Advantage plan: an additional 30 to 90 days on top of that, starting from when you submit the application to that specific plan.

In a typical market, there are 5 to 15 MA plans with meaningful patient volume. The largest plans — UnitedHealthcare and Humana — run the longest credentialing timelines, sometimes 90 days or more. Regional plans can be faster, but some run slower because their credentialing staff is smaller.

If you’re joining a practice in a market where 50% of Medicare patients are in MA plans, and you start the MA applications after PECOS clears, your timeline looks like this:

• Month 0: PECOS submitted
• Month 2–3: PECOS approves, PTAN issued
• Month 2–3 (same time): Submit MA applications to the top 5 plans
• Month 4–5: First MA approvals come back (the faster plans)
• Month 5–6: Larger plan approvals (UHC, Humana)

That’s 5 to 6 months before you can bill the majority of your Medicare-aged patient panel in-network. If you wait to submit MA applications until PECOS clears, add 60 to 90 days.

The right move: submit MA applications in parallel with PECOS

Most MA plans will accept a credentialing application before PECOS is approved. They will verify the NPI and check the CMS enrollment status as part of their process. If PECOS approves before the MA application is processed, the plan’s credentialing team picks it up from there.

This means you can — and should — submit MA applications at the same time you submit PECOS. The MA plans don’t move faster because PECOS is done. Submit early, and PECOS approval lands while the MA applications are already in motion.

The payer-directory problem

Here is a failure mode that’s less obvious than the timeline: Medicare Advantage plans maintain their own provider directories, and CMS audits those directories for accuracy. When a plan’s directory is inaccurate — listing providers who aren’t credentialed — CMS issues compliance notices.

What this means for providers: the MA plan has a strong incentive to process credentialing applications accurately, but in periods of high application volume, some plans have been known to show providers in their directory before credentialing is fully complete. A patient scheduling based on that directory listing, seeing the provider, and then receiving an out-of-network denial is a billing and compliance event.

Verify, in writing, that your credentialing is approved and your effective date is confirmed before billing MA claims. Don’t assume directory listing equals approved.

Special-needs plans and DSNP credentialing

Dual Special Needs Plans (D-SNPs) serve beneficiaries who qualify for both Medicare and Medicaid. These plans have their own credentialing requirements layered on top of MA requirements, and their populations skew toward complex, high-utilization patients.

If your specialty or patient population includes a high proportion of dual-eligible beneficiaries — geriatrics, nephrology, behavioral health — you’ll need to credential separately with the DSNP products, not just the MA products. Some carriers run DSNP and MA credentialing through the same channel. Others run them separately.

Ask the plan explicitly: “Does my MA credentialing cover your DSNP product?” and get the answer in writing.

Recredentialing cadence on MA plans

Traditional Medicare recredentialing runs on a CMS-set cycle. Medicare Advantage plans set their own recredentialing cycles — typically every 2 to 3 years, but the dates vary by plan.

Practices that handle their own credentialing often lose track of MA recredentialing deadlines because there’s no single authority tracking them. The payer sends a notice; the notice goes to the billing email or the front desk; nobody follows up. The recredentialing lapses, and the next claim gets rejected.

Tracking MA recredentialing deadlines requires knowing every plan the provider is credentialed with and every plan’s cycle. For a practice with 5 providers across 8 MA plans, that’s 40 deadlines at staggered intervals.

What to do this week

If you’re onboarding a new provider or assessing your current MA coverage:

1. Pull your patient panel data. What percentage of your Medicare patients are in MA plans? Which plans? That’s your target list.
2. Check your current MA credentialing status. For each provider, log into each plan’s portal and verify active status with a current effective date.
3. Submit MA applications in parallel with PECOS, not after. Don’t wait for the PTAN.
4. Ask each plan specifically about DSNP coverage if your patient population includes dual-eligibles.
5. Map every MA recredentialing deadline for every provider on a single calendar. This is the thing that falls through the cracks most often.

If the MA patchwork is too large to manage internally, that’s the kind of credentialing maintenance we run on Metolius — tracking plans, deadlines, and status across a full roster. Talk to us and we’ll show you what the coverage map looks like for your practice.

— Medical Credentialing Services