Many practices still submit claims and post payments in-house. But limited specialty expertise, staffing gaps, delayed follow-up, or inconsistent reporting can let avoidable revenue slip through the cracks. According to MGMA's 2024 poll, 60% of practice leaders reported higher denial rates than the same period the year before — even among claims where authorization was already on file.
This article covers what medical billing outsourcing typically includes, when it may make sense for an infectious disease practice, how pricing is usually structured, and how to evaluate a potential partner — without relying on unsupported benchmark figures.
Key Takeaways
- Outsourcing transfers defined revenue-cycle tasks to an external partner; the practice keeps oversight and clinical documentation responsibility.
- Specialty experience with OPAT, infusion, buy-and-bill, and authorizations matters more than general billing credentials.
- The right decision depends on your own denial, A/R, and staffing data, not a generic revenue promise.
- Contracts should spell out scope, security obligations, reporting cadence, fees, escalation, and exit terms.
What Medical Billing Outsourcing Includes for an Infectious Disease Practice
The Core Revenue-Cycle Workflow
Outsourced billing means hiring an external company or team to perform some or all revenue-cycle tasks, while the practice stays accountable for documentation accuracy, clinical records, and vendor oversight. Per HFMA's RCM framework, the workflow runs from registration and eligibility verification through claim submission, payer follow-up, and final balance resolution.
For an ID practice, that typically includes:
- Eligibility verification and benefit checks
- Coding review and claim creation
- Submission and payer follow-up
- Denial management and appeals
- Payment posting and reconciliation
- Accounts-receivable work
- Patient-balance communication
Where Infectious Disease Adds Complexity
Professional-fee billing for consults isn't the same workflow as drug-heavy billing. Office infusion and buy-and-bill claims carry their own unit, NDC, and discard-reporting requirements. OPAT runs through a separate home-infusion supplier pathway with its own enrollment and documentation rules. A vendor that only handles E/M coding may not be equipped to manage drug claims or OPAT coordination. Ask specifically.
Selective vs. Full Outsourcing
Outsourcing isn't all-or-nothing. Practices can hand off:
- Denial follow-up only
- Credentialing and payer enrollment
- Coding audits
- Patient statements and balance communication
- Full revenue-cycle management
Documentation Still Drives the Outcome
No vendor can bill for a service that isn't documented. Medical necessity, service dates, diagnoses, procedure detail, place of service, and provider identity all need to be in the record before a claim goes out.
In buy-and-bill, sequence matters: authorization first, then drug purchase, then administration, then billing. Starting therapy before authorization is confirmed puts the acquisition cost at risk if coverage is later denied.
A capable outsourced team should flag a missing authorization or an incomplete note during intake review, before the claim is submitted, not after a denial letter arrives. Catching the gap early doesn't guarantee payment, but it preserves the window to fix it.
When Should an Infectious Disease Practice Consider Outsourcing Billing?
Warning Signs in the Revenue Cycle
Watch for these patterns, regardless of how hard your current team is working:
- A growing accounts-receivable backlog, especially past 90 days
- Repeated denials on the same claim types
- Underpayments that go unflagged because a short-pay doesn't trigger a rejection
- Missed timely-filing deadlines
- Inconsistent payment posting
- Physicians getting pulled into billing questions instead of seeing patients
That last point matters most. One denied drug claim can outweigh a month of office visits in dollar terms. A volume-based denial rate can understate how much exposure sits in infusion and OPAT claims specifically.
Staffing-Related Triggers
Billing often rests on one or two people. That's fragile. Consider outsourcing if:
- Recruiting experienced billers has been difficult
- Turnover keeps resetting institutional knowledge
- One employee's absence creates a coverage gap
- Staff split time between billing and front-desk or clinical-support duties
Growth and Service-Line Changes
Expansion changes the math. A practice may outgrow what the current team can absorb when it is:
- Adding providers
- Launching or expanding OPAT or infusion services
- Renegotiating payer contracts
- Taking on more complex patients
That is not a performance failure. Workload and complexity rose at the same time.
Build Your Own Baseline First
Before deciding anything, pull your own numbers:
- Claim volume by payer and service line
- Denial categories and dollar amounts (not just claim counts)
- Days in A/R, and the percentage over 90 days
- Aged balances and payments awaiting posting
- Staff time spent on billing versus other duties
- Unresolved patient-billing complaints
This baseline becomes the yardstick for comparing any outsourcing proposal. Without it, you're comparing a vendor's promises to a guess.
Benefits, Limitations, and Cost Considerations
What Outsourcing Can Offer
Done well, outsourcing can provide:
- Dedicated billing expertise without a long hiring and training cycle
- More consistent payer follow-up on aging claims
- Reduced administrative burden on clinical staff
- Better visibility into claim status through regular reporting
- Staffing that scales with volume instead of requiring a new hire for every growth spurt
For an ID practice, consistent workflows support OPAT coordination, infusion documentation, authorization tracking, and keeping professional-fee economics separate from drug-related economics. Those two halves of the business behave very differently. None of this is guaranteed; outcomes depend on execution, not the pitch deck.
How Pricing Is Typically Structured
| Model | What it typically includes | Watch for |
|---|---|---|
| Percentage of collections | Fee scales with what's actually collected | How "collections" is defined; carve-outs for certain payers |
| Flat fee | Predictable monthly cost regardless of volume | Whether scope expands without a fee adjustment |
| Per-claim | Charge per claim submitted | Whether denials and resubmissions cost extra |
| Hybrid | A mix of the above | Which activities fall under which tier |
No source supports a universal percentage or flat-fee range for infectious disease practices specifically. Ask any vendor to walk through their pricing model line by line before comparing numbers.
Calculate Your True In-House Cost
Before comparing proposals, total your actual current cost of billing in-house:
- Wages and benefits for billing staff
- Recruiting and training expenses
- Billing software and clearinghouse fees
- Management time spent overseeing billing
- Rework from errors or resubmissions
- Opportunity cost of clinicians or administrators fielding billing questions
Trade-Offs to Weigh
Outsourcing also means giving up some control. Common drawbacks include:
- Reduced day-to-day visibility into billing operations
- Communication delays between practice and vendor
- Less flexibility with patient payment arrangements
- Vendor errors and fees that weren't obvious upfront
- Transition disruption and dependence on a third party's systems
There's no universal price or ROI figure that applies across practices. Compare any proposal against your own volume, payer mix, service lines, staffing model, and historical performance.
How to Evaluate an Outsourced Medical Billing Partner
Specialty Experience and Scope Questions
Ask candidates directly:
- Have they billed infectious disease consults, OPAT, infusion, and buy-and-bill claims before?
- Who handles eligibility checks, authorizations, and coding reviews?
- Who manages denials, appeals, payment posting, and patient calls?
- Who handles refunds and credit balances?
Vague answers here are a red flag. Specialty experience isn't optional for this workload.
Reporting You Should Expect
Request reporting on a fixed schedule. At minimum, it should cover:
- Claim status and denial categories
- Aging by payer
- Unresolved accounts
- Payments posted versus expected
Reporting should be actionable, not just a dashboard of totals. If a vendor can't describe what you'll receive and how often, resolve that before signing anything.
Security, Compliance, and Contract Terms
Any vendor touching patient data is a business associate under HIPAA. Per HHS's sample provisions, a business associate agreement should address safeguards, breach reporting, subcontractor obligations, and data return or destruction at termination.
Beyond the BAA, review:
- Fee basis and implementation charges
- Termination rights and notice periods
- Data ownership and return process
- Audit rights and insurance coverage
- Responsibility for vendor-caused errors
Ask for references from practices of similar size and complexity, but treat any specific performance figures they share as unverified until you confirm them independently.
How to Prepare for and Manage the Transition
What to Gather Before Implementation
Assemble before day one:
- Payer contracts and fee schedules
- Provider enrollment details
- Coding policies and claim history
- Denial reports and aged A/R
- Patient-balance procedures
- Service-line documentation requirements for OPAT, infusion, and buy-and-bill
Define Responsibilities in Writing
Document in writing who handles:
- Clinical documentation queries
- Authorization tracking
- Coding clarifications
- Patient communication
- Appeals, refunds, and legacy accounts that predate the transition
Ambiguity here is where work falls through the cracks.
A transition plan should also cover:
- System access and data migration
- Open claims and existing denials
- Payer enrollment updates and patient notices
- Staff roles and a short parallel-review period before full handoff
Name a practice contact, schedule recurring performance reviews, and document an escalation path.
Run a Phased Transition
Rather than handing off the full billing cycle at once, some practices start narrower, with denial management or A/R follow-up on aging claims, before expanding scope. It's a lower-risk way to see a vendor's actual work before committing fully.
For practices working through this math first, GrowInfectiousDisease publishes free, ungated explainers and browser-based calculators covering practice economics, OPAT and infusion revenue, and revenue-cycle workflows. They're planning tools meant to help organize baseline numbers before a transition conversation starts, not a billing service, and they don't promise a specific financial outcome.
Next Steps for an Infectious Disease Practice
Compare your current in-house process against at least one clearly scoped outsourcing proposal, using your own claim volume, staffing costs, denial patterns, and A/R data, not a vendor's generic pitch.
Build a short scorecard to compare vendors side by side:
- Specialty experience with ID, OPAT, and infusion billing
- Services included and excluded
- Reporting frequency and content
- Security and compliance posture
- Pricing model and total cost
- Implementation timeline and exit terms
Have physician leaders and administrators review OPAT, infusion, buy-and-bill, and revenue-cycle workflows together. Outsourcing decisions touch both clinical operations and practice finances, so they shouldn't be made by one side without the other.
Outsourcing is a management decision, not a substitute for accurate documentation, sound payer strategy, or ongoing financial analysis. Whoever handles the claims, the practice still owns the outcome.
If part of that work involves specialty-specific billing support, Persistex Medical Billing & Coding (the service arm behind GrowInfectiousDisease) can help. The team provides medical billing, coding, and revenue-cycle management built around infectious disease workflows, including OPAT, infusion, and buy-and-bill claims, for independent practices across New England and nationwide.
Frequently Asked Questions
How much does it cost to outsource medical billing?
Pricing varies by service scope, claim volume, payer mix, specialty complexity, and the pricing model used — percentage of collections, flat fee, per-claim, or hybrid. Compare the full fee structure against your internal costs rather than a generic rate.
What is outsourced billing?
Outsourced billing means assigning some or all revenue-cycle tasks to an external company or team. The practice retains oversight and responsibility for clinical documentation.
Is outsourcing medical billing a good idea?
It can help when staffing gaps, denials, follow-up delays, or specialty complexity exceed internal capacity. The decision should rest on your own data and thorough vendor due diligence, not a general assumption.
What is the difference between billing and collection?
Billing covers coding and claim submission. Collection covers payer follow-up, denial appeals, payment posting, accounts-receivable work, and patient-balance communication after the claim goes out.
What should an infectious disease practice look for in a medical billing company?
Look for infectious disease or closely related specialty experience, familiarity with OPAT and infusion workflows, authorization and denial expertise, transparent reporting, HIPAA safeguards, clear fees, and defined accountability.
How can an infectious disease practice prepare to outsource billing?
Document current workflows, gather baseline denial and A/R data, define responsibilities in writing, review contract terms carefully, prepare system access, and set up transition and ongoing oversight procedures before handoff.
