A practice billing professional visits, OPAT, infusion services, and drug charges across multiple payers has far more places for money to go missing than a typical office-based specialty. Denials alone are common: single-specialty practices had 8% of claims denied on first submission in 2022, according to MGMA's 2023 report. Add a drug claim with the wrong unit count or a missed authorization, and the trail gets harder to follow.
These two terms get used loosely in revenue-cycle conversations, often blurred together with "billing" or "collections." This article covers what each term actually means, how the workflow runs in an ID practice, the exceptions that trip practices up, and how to build a process that holds up to scrutiny.
Key Takeaways
- Payment posting applies money to accounts; reconciliation verifies it matches remittances, deposits, and the ledger
- ID practices should track payments, adjustments, denials, recoupments, and unapplied cash separately, not as one lump sum
- A reliable process depends on complete remittance data, clear ownership, and fast exception resolution
- A payment can post cleanly and still be wrong, with underpayments hiding behind a balanced batch
- Judge performance against your own claims and denial data, not industry averages
What Payment Posting and Reconciliation Mean
A few terms get used interchangeably but describe different steps:
- Payment posting records what a payer or patient paid, plus any contractual adjustment, against a specific claim
- Contractual adjustment is the gap between the billed charge and the contracted allowed amount, written off because of the payer agreement, not something the patient owes
- Patient responsibility is the deductible, coinsurance, or copay that transfers to the patient after the payer adjudicates
- Unapplied cash is money received but not yet matched to a claim, common with lump-sum EFTs covering several patients
- Reconciliation confirms that posted entries, bank deposits, remittance totals, and the general ledger all agree
Take a $1,200 infusion visit. The remittance shows a $700 contracted allowance, with the payer paying $560 and assigning $140 to patient coinsurance. The $500 gap between billed and allowed is a contractual adjustment, not a loss.
Posting records all three pieces: the payment, the write-off, and the patient balance. Reconciliation later confirms that $560 actually landed in the bank on the date the remittance says it did.
Posting and reconciliation aren't the same step:
- Posting updates individual accounts, closing out or adjusting a specific claim balance
- Reconciliation compares records across systems, remittance to deposit to ledger, and flags what doesn't match
Why ID Billing Has More Moving Parts
Infectious disease practices rarely bill one clean E/M code per encounter. A single OPAT episode might generate:
- A professional visit or consult charge
- Drug and supply charges tied to NDC and unit reporting
- Administration or infusion codes with time-based rules
- Secondary payer claims once the primary processes
Each line can adjudicate on a different timeline, sometimes across separate remittances. That's before counting OPAT coordination work like vascular access arrangement or weekly clinical review, which don't bill the same way a drug charge does. More claim lines mean more chances for one piece to post wrong while everything else looks fine.
Why Payment Posting and Reconciliation Matter
Bad posting doesn't just create messy books. It changes decisions. When payments post late or incorrectly:
- Accounts receivable reports overstate or understate what's actually collectible
- Patient statements go out for balances the patient doesn't actually owe
- Provider compensation tied to collections uses wrong numbers
- Service-line reporting misrepresents which part of the practice is actually carrying the revenue
Skip reconciliation, and these problems compound quietly:
- Deposits that don't match remittances, with no one checking why
- Duplicate payments posted twice, or payments missing from a batch entirely
- Contractual adjustments applied using the wrong fee schedule
- Credit balances sitting unresolved for months
- Underpayments that never trigger a rejection, so nobody looks twice
Overpayments carry a regulatory clock. Under 42 CFR 401.305, an identified Medicare overpayment generally must be reported and returned within 60 days, or by the next cost-report due date if later.
A good-faith investigation can pause that clock, but only up to 180 days after the overpayment was first identified. Miss the deadline, and a retained overpayment can become False Claims Act exposure.
That's a Medicare-specific rule, not a blanket standard for every payer. Commercial contracts set their own refund terms.
Current OIG compliance guidance (voluntary, not mandatory) typically recommends separating whoever reconciles money from whoever posts it. Confirm current requirements with compliance counsel before setting policy.
How Payment Posting and Reconciliation Work in an Infectious Disease Practice
The flow runs in a predictable sequence, even when the underlying claims are complicated. A service gets delivered and billed, the payer adjudicates, and an ERA or EOB comes back.
Staff then post the payment and any adjustment. Secondary or patient billing follows if a balance remains. Reconciliation closes the loop by matching everything to the deposit and ledger.
That sequence needs several inputs:
- Claim detail and the original charge
- Remittance advice (ERA or paper EOB)
- EFT or check information
- Patient payment records
- Payer contract terms and fee schedules
- Denial codes, refund records, and prior balances
- Bank deposit reports and general ledger entries
Matching a remittance to the right patient, claim, and service line sounds simple until two patients share a similar name, a corrected claim replaces an earlier one, or a payment splits across service lines. Staff or software need safeguards: matching on claim number and date of service rather than patient name alone, and flagging anything that doesn't match cleanly instead of forcing it.
CMS's reassociation guide describes how a Trace Reassociation Number links an EFT payment to its matching ERA. That link is what makes automated matching possible. When the number is missing, delayed, or wrong, someone has to track down the payment manually—the kind of exception that slows everything down.
Step 1: Receive, Validate, and Organize Payment Information
- Confirm ERA or EOB files are complete for the batch, with no missing pages or truncated files
- Match EFT or check amounts to the bank deposit record
- Log paper remittances the same day they arrive, since they don't generate automatic alerts
- Run a batch control total before posting starts, so the end total has something to check against
Step 2: Post Payments, Adjustments, and Responsibility
Line-level detail matters most here. Posting should separate:
- The actual payment amount
- Contractual adjustments, per the payer contract, not a staff guess
- Noncovered amounts
- Patient responsibility
- Secondary payer balances
- Denials, routed for follow-up rather than written off automatically
- Refunds and unapplied cash, flagged rather than buried
Adjustment codes should reflect what the remittance and contract actually say. Guessing at a code because "that's usually what it is" is how incorrect write-offs creep into the books.
Step 3: Reconcile, Investigate, and Close the Batch
Reconciliation compares the remittance total against the EFT or check amount, the deposit record, the posted batch, and the accounting entry. When something doesn't match:
- Isolate the specific line causing the variance
- Check for timing differences first, since a deposit landing a day late isn't an error
- Assign an owner if it's a genuine discrepancy
- Document the correction and who approved it
- Close the batch once everything ties out, or the exception has an owner and a date
Don't force a match that isn't real. A fudged number just moves the problem downstream.
Key Controls, Exceptions, and Specialty-Specific Factors
A few inputs determine whether this process actually works:
- Payer contracts and current fee schedules
- ERA/EOB files and EFT or check data
- Patient payment records and claim forms
- Corrected-claim history
- Drug and supply charge detail, including NDC and unit data
Operating conditions change outcomes too. How often batches get posted, whether a payer is enrolled for electronic remittances, claim volume, and staffing coverage all affect how fast exceptions get caught. A practice posting weekly instead of daily will always carry a larger backlog.
Systems matter as much as process. The practice-management system, EHR, clearinghouse, payment gateway, bank portal, and accounting system all need to communicate. Interface failures and duplicate imports are a quiet source of reconciliation differences: a file imports twice, a payment posts twice, and nobody notices until the deposit total doesn't match.
For ID practices, scale shows up fast. Recurring OPAT or infusion visits, high-dollar drug charges, frequent corrected claims, and a mix of payer and patient payments all multiply the line items that need to reconcile cleanly each month.
Services like GrowInfectiousDisease's Payment Reconciliation and Underpayment Review exist specifically for this category, flagging short-pays, wrong fee schedule application, and unit or NDC mismatches that most batches don't catch on their own.
Compliance constraints apply regardless of volume:
- Role-based access, limited to what each staff member needs
- Segregation of duties between posting and approving refunds or write-offs
- Secure handling of remittance data, since it contains PHI
- Documented retention of correction history
Common Exceptions and Misconceptions
"Posted" doesn't mean "paid correctly." A payment can post cleanly and still be wrong. Common failures include underpayments, incorrect adjustment codes, duplicate payments, and payer recoupments buried in provider-level adjustments. The batch balances. The underlying payment is still off.
Common exceptions that need a defined path rather than ad hoc handling:
- Unapplied cash and unidentified EFTs
- Partial payments and payer takebacks
- Credit balances
- Zero-pay remittances
- Secondary-payer activity arriving weeks after the primary
- Patient payments that can't immediately be matched
A simple exception-queue framework helps:
- Log the issue and assign an owner
- Document what was done
- Escalate if unresolved within a defined window
- Record closure evidence
OIG's enforcement history includes a federally qualified health center that agreed to pay over $350,000 in 2024 after allegedly identifying overpayments and failing to report or return them. Unresolved credit balances are a compliance issue, not just an accounting one.
Building a Reliable Payment Posting and Reconciliation Process
Clear ownership prevents most of the problems above:
- Payment posters post daily and flag anything that doesn't match cleanly
- Billing staff review posted claims weekly, chasing denials and unapplied cash
- Practice administrators review reconciliation reports weekly and approve refund or write-off requests
- Physician owners or group leaders get a monthly summary covering variance, open exceptions, and denial trends
- Accounting personnel tie posted totals to the general ledger monthly, independent of whoever posts payments
A written standard operating procedure should cover:
- Remittance intake and batch numbering
- Posting rules and which adjustment codes apply when
- Exception escalation and refund handling
- Sign-off authority before a batch closes
Metrics Worth Tracking
- Posting turnaround time: how long between remittance receipt and posting
- Unapplied cash balance and age: a growing balance usually signals a matching problem
- Reconciliation variance: the dollar gap between remittance, deposit, and ledger
- Payment variance by payer: actual payment against the contracted rate
- Denial-to-payment trends: by category and dollar amount, not just claim count
Published benchmark ranges exist from sources like MGMA and HFMA's MAP program, but treat them as reference points rather than targets. Cohort size, payer mix, and specialty focus vary too much between those studies to apply them as a fixed goal for an ID practice.
The most useful monthly review compares expected reimbursement under your actual contracted rates against what was paid, line by line, for your highest-dollar drug and infusion claims. That's how recurring underpayments get caught instead of absorbed quietly.
The same review separates genuine payer variance from coding or documentation problems on your side, so you know whether the fix belongs with the payer or with your own claims process.
To see how expected reimbursement, staffing, and drug costs interact at a practice level, GrowInfectiousDisease's Independent ID Practice Economics Calculator models office, hospital, APP, and infusion revenue against those costs using your own numbers rather than published averages.
When the Process May Not Hold Up as Designed
Manual posting and reconciliation start to break down with:
- High transaction volume across multiple payers
- Several ERA formats and inconsistent electronic enrollment
- Multiple disconnected systems across PM, EHR, clearinghouse, and accounting
- Frequent recurring service-line claims, like weekly infusion visits
Automation can help, but only if it preserves reviewability. An automated match still needs an audit trail and a human checkpoint for anything that doesn't match cleanly.
Watch for these signals that the process is running by default, not by design:
- Unapplied cash that keeps growing instead of shrinking
- The same unexplained variance showing up month after month
- Adjustments forced to make totals balance
- Exceptions sitting open for months with no owner
- Reports from different systems that never quite agree
Any of these is a reasonable trigger to bring in an accounting, compliance, or revenue-cycle specialist before the problem compounds further.
Conclusion
Payment posting puts money and adjustments against the right accounts. Reconciliation confirms those records actually reflect what got remitted and deposited. Treat them as the same task, and underpayments, unapplied cash, and credit balances pile up quietly in the gap between the two.
Infectious disease practices carry more of that gap than most specialties. OPAT coordination, infusion billing, drug and supply charges, recurring treatment episodes, and multiple payers all add claim lines that need to reconcile correctly, not just post cleanly.
None of this requires more software as a first move. It requires verified payer terms, your own practice data, documented controls, clear ownership, and exceptions that get resolved instead of ignored. Get those right, and the revenue-cycle numbers your practice relies on actually mean something.
Frequently Asked Questions
What are the requirements to open a private clinic?
Requirements vary by state, entity structure, specialty, services offered, payer participation, facility type, and applicable licensing, credentialing, privacy, and infusion or laboratory rules. Confirm current requirements with qualified legal, regulatory, and professional advisers before proceeding.
What does a physician consultant do?
A physician consultant typically advises on clinical operations, documentation, service-line design, quality, or practice economics. That's different from the day-to-day work of billing, payment posting, and reconciliation staff, who handle transaction-level processing rather than strategic advisory work.
How much do medical consultants charge per hour?
Rates vary widely by expertise, scope, geography, and engagement structure, so there's no reliable universal figure to quote. Request a written scope, deliverables, assumptions, and fee structure before engaging any consultant.
