CAQH vs PECOS: What's the Difference?

CAQH vs. PECOS: What's the Real Difference?

Two acronyms cause more confusion in provider enrollment than almost anything else: CAQH and PECOS. They both hold provider credentialing data. They both ask for nearly identical information — licenses, education, work history, malpractice coverage. And they don't talk to each other.

This leads to one of the most common and costly mistakes in credentialing: assuming that completing one system automatically covers the other. It doesn't. A provider can have a perfect, fully attested CAQH profile and still be completely unable to bill Medicare, because Medicare doesn't use CAQH at all. Understanding exactly where these two systems diverge — and where they need to stay in sync — is essential for any practice managing enrollment across commercial and federal payers.

The One-Sentence Version

CAQH ProView is a data repository used by commercial payers. PECOS is a legal enrollment system run by CMS specifically for Medicare. One stores your information for private insurers to review; the other is the actual gateway you must pass through to bill federal Medicare.

That distinction matters more than it sounds like it should, because it changes what each system requires from you, how often you have to touch it, and what happens if you get it wrong.

What Is CAQH?

CAQH (Council for Affordable Quality Healthcare) ProView is essentially a universal credentialing application — commonly described as the "Common App" of the medical industry. Almost all major commercial payers — Aetna, Blue Cross Blue Shield, Cigna, UnitedHealthcare, Humana, and many regional plans — use CAQH as their primary data source for credentialing.

Instead of filling out 15 or 20 nearly identical applications for 15 or 20 different insurers, a provider builds one CAQH profile containing their CV, licenses, malpractice certificate, education history, and work history. From there, the provider authorizes specific payers (or grants universal access) to pull that data directly.

Key characteristics of CAQH:

• It's a data repository, not an approval authority. Completing CAQH doesn't mean a payer has approved you — it just means the payer has the data they need to begin their own review.
• It requires re-attestation every 120 days, even if nothing has changed. Miss this deadline and your profile goes inactive, which can silently stall every commercial application relying on it.
• It's free for providers.
• It does not cover Medicare. This is the detail that trips up the most practices.

For a full walkthrough of how CAQH works, see our companion guide, <a href="/blog/what-is-caqh">What Is CAQH?</a>

What Is PECOS?

PECOS — the Provider Enrollment, Chain, and Ownership System — is the online portal run by the Centers for Medicare & Medicaid Services (CMS) that manages Medicare provider enrollment. If a provider wants to bill Medicare Part B, order durable medical equipment, or refer patients for Medicare-covered services, enrollment through PECOS is mandatory. There is no substitute and no alternative pathway.

Key characteristics of PECOS:

• It's a legal enrollment system, not just a data repository. PECOS links an individual provider's Type 1 NPI to a group practice's Type 2 NPI and Tax ID, and it's heavily focused on fraud prevention — asking detailed questions about ownership structure, adverse legal actions, and banking information for direct deposit.
• It's tightly integrated with NPPES. Data flows directly from the NPPES registry (which issues NPIs) into PECOS, so any mismatch in your NPI record — an outdated taxonomy code, a name discrepancy, an old address — will surface as a conflict during PECOS submission before your application can move forward.
• Processing is fast when the application is clean. According to Medicare Administrative Contractor (MAC) processing data, a complete PECOS web submission processes in about 7 days on average. Submit the same application with missing information, and that timeline stretches to roughly 35 days — a fivefold difference driven entirely by preventable errors.
• Providers must revalidate periodically (generally every 5 years) to maintain active Medicare enrollment status.
• No provider can bill Medicare until CMS approves the PECOS application and issues a Provider Transaction Access Number (PTAN). In limited circumstances, retroactive billing up to 30 days before the application's received date may be permitted, but this is the exception, not the rule.

CAQH vs. PECOS: Side-by-Side Comparison

Does Medicare Use CAQH?

No. This is worth stating plainly because it's the single most common point of confusion. Medicare does not access CAQH for credentialing or enrollment purposes. Providers must enroll directly through PECOS, and a complete, attested CAQH profile has no bearing on Medicare enrollment status whatsoever.

There's one nuance worth knowing: Medicare Advantage plans, which are commercial insurance products built on top of Medicare, are typically run by private insurers — and those private insurers often do use CAQH for their own credentialing process, separate from a provider's underlying PECOS/Medicare enrollment. So a provider participating in Medicare Advantage networks may still need both PECOS (for traditional Medicare) and a current CAQH profile (for the Medicare Advantage plan's own commercial credentialing).

Does Medicaid Use CAQH or PECOS?

Neither, exactly — Medicaid has its own separate lane, and it splits depending on the type of Medicaid program:

• State Medicaid Programs (Direct/Fee-for-Service): Enrollment is not handled through CAQH or PECOS. Providers must enroll through each state's own Medicaid portal.
• Medicaid Managed Care Organizations (MCOs): Most of these operate more like commercial payers and do rely on CAQH for credentialing, since MCOs function similarly to private insurance plans layered on top of the state Medicaid program.

This means a provider serving Medicaid patients may need to navigate a state-specific portal, a CAQH profile, or both — depending on whether they're contracting directly with the state program or with a managed care plan.

Why the Two Systems Don't Sync — and Why That Matters

CAQH and PECOS were built by entirely different organizations for entirely different purposes, and they were never designed to communicate with each other. This means:

• Updating your address in CAQH does not update it in PECOS, and vice versa. Each system has to be maintained separately.
• A lapsed CAQH profile can cause problems even outside of commercial credentialing. An expired CAQH attestation at the time of a PECOS submission is cited as one of the most common and entirely preventable causes of a MAC "development request" — an additional-information request from CMS that adds weeks to processing.
• Name, taxonomy, and address mismatches between NPPES, CAQH, and PECOS are one of the leading causes of processing delays and claim denials across the board. If your legal name reads differently across the three systems — even a missing middle initial — expect a manual review flag somewhere down the line.

The practical implication: treat CAQH and PECOS as two separate, ongoing maintenance tasks, not a single task that gets marked "done" once. Both need to be checked, updated, and kept internally consistent with each other and with your core NPPES/NPI record on an ongoing basis — not just during initial onboarding.

A Simple Way to Think About It

If you're billing a commercial insurance plan — Aetna, Cigna, a regional Blue Cross plan — think CAQH.

If you're billing traditional Medicare — Part B, DME orders, referrals for Medicare-covered services — think PECOS.

If you're dealing with Medicaid, check whether you're enrolling directly with the state (its own portal) or with a Medicaid Managed Care plan (likely CAQH).

Most practices with a mixed payer base end up maintaining all three simultaneously: a current CAQH profile, an active PECOS enrollment, and one or more state Medicaid enrollments — and all three need to stay internally consistent to avoid delays and denials.

Frequently Asked Questions About CAQH vs. PECOS

Is CAQH the same as PECOS?

No. CAQH is a data repository used primarily by commercial payers for credentialing. PECOS is a CMS-run legal enrollment system used specifically to enroll providers in Medicare. They serve different purposes, are run by different organizations, and do not share data with each other.

Do I need both CAQH and PECOS?

Most providers who bill both commercial insurance and Medicare need both. A CAQH profile alone does not enroll you in Medicare, and PECOS enrollment alone does not satisfy commercial payer credentialing requirements.

Does completing PECOS also complete my CAQH profile?

No. The two systems are entirely separate and don't sync automatically. Updating information in one does not update the other — each must be maintained independently.

How often do I need to update CAQH vs. PECOS?

CAQH requires re-attestation every 120 days, regardless of whether anything has changed. PECOS generally requires revalidation on a longer cycle — typically every 5 years — though providers should update PECOS immediately any time key details change, such as practice address or ownership.

Does Medicare use CAQH for credentialing?

No, traditional Medicare does not access CAQH. However, Medicare Advantage plans — which are privately run commercial products layered on top of Medicare — often do use CAQH for their own credentialing process, separate from standard Medicare/PECOS enrollment.

How long does PECOS enrollment take?

A complete, accurate PECOS web submission processes in about 7 days on average, according to MAC processing data. An incomplete submission can stretch that to roughly 35 days, since missing information typically triggers a development request that adds significant delay.

Can a mismatch between CAQH and PECOS cause claim denials?

Yes. Discrepancies in name formatting, taxonomy codes, or addresses across NPPES, CAQH, and PECOS are a well-documented source of processing delays and denials. Keeping all three systems consistent with each other is essential.

Does Medicaid use CAQH or PECOS?

Neither directly. Medicaid enrollment depends on the specific program: state-run fee-for-service Medicaid typically requires its own state-specific portal, while Medicaid Managed Care Organizations (MCOs) generally use CAQH, similar to commercial payers.

Is there a cost to use CAQH or PECOS?

No, both are free for providers to register and maintain.

What happens if my CAQH profile lapses right before a PECOS submission?

An expired CAQH attestation at the time of PECOS submission is cited as one of the most common, avoidable causes of a MAC development request — meaning your Medicare enrollment can be slowed down by a completely separate system simply because it wasn't kept current.

Key Takeaways

• CAQH = commercial payer data repository. PECOS = Medicare's legal enrollment system. They are not interchangeable.
• Completing one does not complete or substitute for the other — they must be maintained independently and simultaneously for providers who bill both commercial insurance and Medicare.
• The two systems don't sync, so keeping your name, address, and taxonomy code consistent across NPPES, CAQH, and PECOS is essential to avoiding delays and denials.
• CAQH needs re-attestation every 120 days; PECOS needs periodic revalidation, generally every 5 years.
• Medicaid sits outside both systems in most cases — direct state Medicaid programs use their own portals, while Medicaid Managed Care Organizations typically use CAQH.

Juggling CAQH re-attestations, PECOS revalidations, and state Medicaid requirements across multiple providers is one of the most common points of breakdown in a practice's revenue cycle. If your team needs help keeping all three systems aligned and current, a dedicated credentialing partner can manage the entire process so nothing quietly lapses.