Medical Billing and Credentialing Services: The Complete Guide for US Healthcare Practices

Most healthcare practices treat billing and credentialing as two separate problems handled by two separate teams. That's usually the first mistake. A provider can be the most skilled physician in their specialty. But if their credentialing file isn't active with a payer, every claim submitted on their behalf gets denied, no matter how clean the billing is. 

Medical billing and credentialing services exist precisely because these two functions have to move together, not in parallel silos. Practices that get this right don't just avoid denials; they get paid faster and spend far less time chasing down why a claim bounced back. 

What Are Medical Billing and Credentialing Services?

Medical billing is the process of translating patient encounters into claims, submitting them to payers, and following up until reimbursement is collected. It covers coding accuracy, claim scrubbing, denial management, and accounts receivable follow-up.

Credentialing, also called provider credentialing or payer enrollment, is the verification process that confirms a provider's qualifications, licenses, and background before an insurance company accepts their claims. This includes primary source verification, CAQH profile management, and enrollment applications submitted to Medicare, Medicaid, and commercial payers. Source: CAQH 

They're different processes, but one cannot function without the other. A practice can have a flawless coding and billing infrastructure and still collect zero dollars if a provider isn't properly enrolled with the payers that cover their patients.

Why Credentialing and Billing Are Connected

Here's the part most service providers gloss over: credentialing isn't a one-time administrative checkbox. It's the gatekeeper that determines whether your billing team's work has any chance of getting paid.

When a claim is submitted under a provider who isn't credentialed with that specific payer, it doesn't come back pending. It comes back denied. In most cases, it can't simply be resubmitted once credentialing catches up, and depending on the payer's timely filing rules, that revenue may be gone permanently.

This is why practices that separate billing and credentialing into disconnected vendors often see a pattern of unexplained denials that neither team takes ownership of.

What Happens If Credentialing Lapses Mid-Practice?

Credentialing isn't set it and forget it. Most payers require re-credentialing every 2 to 3 years, and CAQH profiles require periodic re-attestation, typically every 120 days. Miss a re-attestation window or a renewal deadline, and a provider can be quietly dropped from a payer's network without an obvious warning.

The practice keeps seeing patients, keeps billing, and keeps getting denials until someone finally traces the problem back to an expired credentialing status. By the time it's caught, weeks or months of claims may already be unrecoverable.

How Long Does Credentialing Really Take?

Ask ten companies this question, and you'll get ten vague answers like 30 to 90 days. The real answer depends entirely on the payer type, and practices deserve a clearer picture before they plan around it.

Medicare Enrollment Timeline

Medicare enrollment runs through the PECOS system and is generally the most standardized process, but incomplete applications or mismatched NPI data are the most common cause of delay. A clean, accurate submission the first time is what actually separates a 45-day approval from a 90-day one. Source: CMS PECOS 

Medicaid Enrollment Timeline

Medicaid credentialing varies significantly by state because each state manages its own enrollment portal and documentation standards. A provider credentialed in one state's Medicaid program doesn't automatically transfer that status to another, which matters for practices expanding across state lines. Source: Medicaid.gov 

Commercial Payer Enrollment Timeline

Commercial payers often take the longest because credentialing and network contracting happen as two linked but separate steps. Being credentialed doesn't always mean a provider is in-network yet; that distinction alone confuses a lot of practices.

The Real Cost of Delayed or Incorrect Credentialing

Let's put a number on this instead of speaking in generalities. Say a provider generates roughly $15,000 in monthly billable revenue. If their credentialing is delayed by 60 days beyond the expected timeline, that's approximately $30,000 in revenue sitting in limbo. Some of it may be recoverable through backdating, where payers allow it. The rest is often permanently lost due to timely filing limits.

Beyond the direct revenue impact, there's a hidden administrative cost. Every denied claim tied to a credentialing gap has to be identified, appealed, or written off. That consumes staff hours that could otherwise go toward clean, current claims. Incomplete or outdated credentialing files also carry compliance risk. Payer audits can flag lapsed re-attestations, and in worst-case scenarios, this can trigger broader network reviews. Source: NCQA

In-House vs. Outsourced Medical Billing and Credentialing

Practices weighing whether to keep this function in-house or hand it to a specialized partner usually underestimate the true cost of doing it internally.

The in-house route can work for very large practices with the budget for a full administrative department. For most independent practices and small-to-mid-size groups, the math tends to favor outsourcing. Once you account for turnover, training time, and the cost of even a handful of preventable denials, outsourcing usually wins out.

Credentialing Needs by Specialty

Credentialing isn't one-size-fits-all. Different specialties carry different documentation and payer requirements.

• Behavioral health providers often face additional licensure verification steps. Payer-specific behavioral health network requirements can also extend timelines beyond the standard range.

• Telehealth providers need credentialing that accounts for multi-state licensure. Delivering care across state lines may require separate enrollment in each state where patients are located.

• Surgery centers and ambulatory facilities typically require facility-level credentialing in addition to individual provider credentialing. This is a layer most generic guides don't mention.

• Solo practitioners usually move faster through credentialing than large group practices. There's simply a single file to manage, rather than dozens moving through the pipeline at once.

How to Choose a Medical Billing and Credentialing Company

Not every company that offers credentialing services actually handles the full scope well. Before signing a contract, get clear answers to the following:

• Is pricing transparent? Flat fee, per-provider fee, or percentage of collections, and does it include re-credentialing, or is that billed separately later?

• Is there a dedicated account manager? Or will you be routed through a general support queue every time you have a question?

• Is there real-time visibility? A portal or dashboard where you can actually see application status beats waiting on email updates.

• Do they have state-specific expertise? Medicaid rules differ enough by state that generic, one-size-fits-all processes cause delays.

• Do they handle billing and credentialing together? A single team that owns both reduces the finger-pointing that happens when two vendors blame each other for a denial.

Questions to Ask Before Signing a Contract

Ask directly: What's your average enrollment turnaround by payer type? What happens if an application is rejected? Do you resubmit at no extra cost? How do you track re-credentialing deadlines so nothing lapses? A vendor that can answer these specifically, rather than with a generic timeline, is one that actually has a repeatable process behind it.

How MI MedCare Handles Billing and Credentialing Together

At MI MedCare, credentialing and billing aren't handled by disconnected teams working off separate assumptions. The process starts with gathering complete provider information: licenses, DEA certificates, board certifications, and work history.

Next comes accurate application completion and submission to Medicare, Medicaid, and commercial payers. From there, primary source verification confirms every credential against the original issuing source. The team also proactively follows up with payers instead of waiting for a response.

Once a provider is active, that credentialing status feeds directly into the billing workflow, so claims aren't submitted against a provider whose enrollment is incomplete or lapsed. Ongoing CAQH management and re-credentialing tracking keep that status current for the long term, not just at onboarding.

The numbers behind this process: 1,000+ providers credentialed, hundreds of payers networked with, and a 30-day average enrollment time. These figures hold up because credentialing and billing are managed as one connected workflow, not two separate hand-offs.

How much do medical billing and credentialing services cost?

Pricing typically falls into one of three models: a flat monthly fee, a per-provider credentialing fee, or a percentage of collections for billing (commonly in the 4–8% range, depending on specialty and claim volume). Ask whether re-credentialing and CAQH maintenance are included or billed as add-ons.

Can billing and credentialing be handled by the same company?

Yes, and it's generally the better approach. When one team manages both, credentialing status is directly visible to the billing side, which prevents claims from being submitted against providers who aren't yet active with a given payer.

How long does provider credentialing take?

On average, 30 to 120 days depending on the payer. Medicare tends to move fastest through PECOS, while Medicaid and commercial payers vary more, often due to state-specific rules or network contracting steps.

What happens if a provider isn't credentialed yet but sees patients?

The provider can still see patients, but claims submitted under their name to a payer they aren't credentialed with will be denied. Some payers allow retroactive billing back to the application date once credentialing is approved, but this isn't guaranteed and varies by payer and state.

Conclusion

Billing and credentialing aren't two separate line items to manage. They're one continuous process that determines whether your practice actually gets paid for the care it provides. Practices that treat them as connected, rather than outsourcing them to different vendors with no shared visibility, consistently see fewer denials and faster reimbursement.