Dermatology Underpayments: The Hidden Revenue Leaks That Denial Reports Miss

A paid claim doesn’t always mean a correctly reimbursed claim. From outdated fee schedules and multiple-procedure adjustments to specialty drug pricing and E/M reductions, dermatology underpayments can quietly erode revenue without triggering a denial. Discover how practices can identify reimbursement discrepancies, strengthen contract compliance, and turn payment data into actionable revenue recovery opportunities.

 

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Introduction: When Paid Claims Still Lose Revenue

A claim can be processed, paid, and closed in the billing system while still leaving a dermatology practice with less reimbursement than its contract allows. Unlike denials, underpayments rarely trigger an obvious warning. They can pass through routine payment posting, be recorded as contractual adjustments, and remain undetected long after the opportunity to recover the difference has narrowed.

For dermatology groups, where surgical procedures, pathology services, multiple-procedure encounters, and specialty medications create complex reimbursement patterns, the financial impact can accumulate across thousands of claims. Identifying these gaps requires more than monitoring denials or collection rates. It requires a systematic comparison of what payers actually reimburse against what they are contractually obligated to pay.

Why Dermatology Underpayments Go Unnoticed

Denials generate work queues, rejection notices, and follow-up activity. Underpayments often generate none of these.

When a payer reimburses a claim below the expected contracted amount, the remittance advice may show a paid claim with adjustments that appear routine. If the billing team does not compare the adjudicated payment against the applicable contract terms, the shortfall may be accepted as a legitimate adjustment.

The distinction matters. A contractual adjustment is not automatically an underpayment. It may be entirely appropriate under the agreement. The problem arises when the adjustment is accepted without validating whether the payer applied the correct fee schedule, reimbursement methodology, coding rules, and contractual provisions.

Several operational weaknesses allow these discrepancies to persist:

• Incomplete contract configuration: Fee schedules may be missing, outdated, or loaded without the modifiers and reimbursement rules needed to calculate expected payment accurately.
• Payment posting focused on closure: Teams may prioritize reconciling deposits and closing claims rather than investigating unexplained payment variances.
• Limited line-level visibility: Reviewing only the total payment for an encounter can conceal individual service lines that were reimbursed incorrectly.
• Fragmented accountability: Payment posting, denial management, contract administration, and appeals may operate as separate functions without a common revenue recovery process.
• Insufficient trend analysis: Small discrepancies across recurring procedures may never attract attention when each claim is evaluated in isolation.

The result is a gap between reported collections and the revenue a practice should have realized under its contracts.

Five Reimbursement Risks Dermatology Practices Should Investigate

1. Outdated or Incorrect Fee Schedules

Commercial payer contracts can use fixed rates, annual fee schedules, percentages of a Medicare benchmark, or other negotiated reimbursement formulas. Each arrangement creates a different risk when contract terms or fee schedules change.

For example, a contract tied to a percentage of the Medicare Physician Fee Schedule may require updated benchmark rates when the applicable schedule changes. If the payer or the practice's expected-reimbursement model uses an incorrect effective date or fee schedule, payment discrepancies may recur across affected services.

Dermatology practices should pay particular attention to frequently billed services, including skin biopsies (11102–11107) and destruction of premalignant lesions (17000, 17003, and 17004), while validating the applicable code definitions and reimbursement rules for the service date.

What to investigate: Compare actual allowed amounts against the contractually applicable rates, accounting for effective dates, geographic adjustments, modifiers, and any relevant payer-specific provisions.

2. Billed Charges That Trigger Lesser-of Contract Provisions

Some payer agreements reimburse the lesser of the provider's billed charge or the contracted allowable amount. Under these arrangements, a practice may receive less than its negotiated rate when its charge for a service falls below the applicable contractual allowable.

This can become a revenue integrity issue when charge schedules are not reviewed alongside contract changes.

Consider a hypothetical example: a contract allows $180 for a procedure, but the practice's billed charge is $150. If the agreement applies a lesser-of provision, the allowable payment may be limited to $150, subject to the contract's other terms.

The claim may be adjudicated correctly, meaning there is no payer underpayment to appeal. Instead, the opportunity lies in reviewing the practice's charge structure and understanding how it interacts with negotiated reimbursement.

For dermatology groups performing Mohs surgery, excisions, and repairs, this review should include relevant procedure families, such as 17311–17315 and 11600–11646, as applicable to the services performed.

What to investigate: Compare billed charges with contractual allowables, identify services affected by lesser-of provisions, and evaluate whether the charge schedule remains appropriate and compliant with applicable requirements.

3. Incorrect Multiple-Procedure and Claim-Line Adjudication

Dermatology encounters may involve multiple procedures, additional units, distinct anatomical sites, or combinations of evaluation and management services with procedures. These encounters can create complex reimbursement calculations.

Payers may apply multiple-procedure reductions, bundling edits, unit limitations, or modifier requirements. Some adjustments will be contractually correct; others may warrant investigation when the payer's processing conflicts with applicable coding guidance or the agreement.

For example, a practice performing multiple eligible procedures during one encounter should verify whether the payer applied the correct reduction methodology to each service line. It should also confirm that separately reportable services were not incorrectly bundled or reduced.

Mohs surgery, associated repairs, and other surgical services deserve careful review because their reimbursement may depend on code combinations, documentation, anatomical considerations, and payer-specific rules.

What to investigate: Reconcile each service line against the applicable coding conventions, payer policies, contract provisions, and documented services. Avoid treating every reduction as an underpayment simply because the total reimbursement is lower than expected.

4. Specialty Medication Reimbursement and Pricing Updates

Dermatology practices that administer or dispense specialty medications may face a different set of reimbursement risks from those associated with professional services.

Certain physician-administered drugs are reimbursed using formulas tied to Average Sales Price (ASP), a specified percentage or add-on, or another contractual methodology. When applicable, the formula may depend on the relevant drug code, dosage units, billing units, date of service, and pricing period.

A mismatch between the pricing benchmark used in the reimbursement calculation and the one required by the applicable agreement can produce recurring discrepancies.

For example, practices administering biologic therapies should review drug reimbursement separately from administration services. The correct payment methodology may differ by payer, product, setting, and contract. Drug-code selection, unit conversion, and documentation must also be validated.

What to investigate: Reconcile drug-specific payments against the applicable pricing methodology and effective period. Review units billed versus units reimbursed, the correct HCPCS code, contractual add-ons, and any separately payable administration services.

5. Evaluation and Management Reductions and Modifier 25

Dermatology visits frequently involve an evaluation and management (E/M) service on the same date as a separately reportable procedure. When the documentation and applicable rules support reporting both services, modifier 25 may be appropriate.

However, payer edits and reimbursement policies can affect how these claims are adjudicated. A paid claim does not necessarily mean the E/M service received the expected reimbursement.

The key is to distinguish between a legitimate adjustment under the applicable rules and an incorrect reduction. Practices should not assume that every lower E/M payment represents a contractual violation, nor should they accept an unexplained reduction without review.

What to investigate: Track E/M services billed with modifier 25, compare the adjudicated service and payment with the expected result, and review documentation, coding requirements, and payer-specific policies before initiating an appeal.

How Underpayments Appear in Remittance Data

Electronic remittance advice (ERA) provides important clues, but adjustment codes must be interpreted in context. A code alone does not establish that a payer has underpaid a claim.

For example, CO-45 generally represents an adjustment because the billed charge exceeds the fee schedule or maximum allowable amount. It can be entirely appropriate. A discrepancy becomes an underpayment concern when the resulting reimbursement does not align with the applicable contractual terms.

The following table illustrates how dermatology practices can structure their investigations.

Reimbursement risk	Potential remittance pattern	Examples to review	Recommended detection method
Fee schedule mismatch	Allowed amount differs from expected rate	Biopsies, lesion destruction	Compare allowed amounts with effective-dated fee schedules
Lesser-of provision	Payment limited to billed charge	Surgical procedures and excisions	Audit billed charges against contract allowables
Multiple-procedure processing	Unexpected reduction on one or more lines	Eligible surgical code combinations	Validate line-level reductions against contract and coding rules
Drug reimbursement discrepancy	Drug line paid below expected amount	Applicable biologic HCPCS codes	Reconcile drug units, pricing methodology, and contractual terms
E/M payment discrepancy	E/M line reduced or processed differently than expected	E/M services with modifier 25	Compare adjudication with documentation, coding, and payer policy

The purpose of this analysis is not to flag every adjustment as an error. It is to separate legitimate contractual adjustments from discrepancies that deserve recovery action.

Building an Underpayment Detection and Recovery Process

Identifying reimbursement gaps consistently requires a repeatable workflow rather than occasional spot checks.

Step 1: Establish Contractual Expected Reimbursement

Maintain a centralized, current record of payer agreements and their applicable reimbursement terms. Where supported by the contract, the expected-payment model should account for CPT or HCPCS codes, modifiers, units, place of service, effective dates, multiple-procedure rules, and other relevant conditions.

Not every agreement can be represented by a simple fee schedule. Percentage-based arrangements, bundled payments, and other methodologies may require additional calculation logic.

Step 2: Compare Expected and Actual Payments

Compare adjudicated reimbursement with expected reimbursement at the service-line level whenever the available data supports it.

The comparison should account for legitimate adjustments, patient responsibility, coordination of benefits, bundling, contractual limitations, and other relevant factors. Otherwise, the system may produce a large volume of false-positive exceptions.

A variance should be treated as an investigation trigger, not automatic proof of payer error.

Step 3: Create a Dedicated Underpayment Work Queue

Potential underpayments should be routed into a workflow distinct from routine denial management.

Each item should include:

• Payer, claim number, date of service, and affected service line.
• Expected reimbursement and actual adjudicated amount.
• The suspected reason for the discrepancy.
• Relevant contract provisions and supporting remittance details.
• The next action, responsible owner, and applicable filing or dispute deadline.

This structure prevents valid claims from being closed prematurely simply because a payment has been received.

Step 4: Prioritize by Recoverability and Financial Impact

Not every discrepancy deserves the same level of effort. Prioritization should consider the dollar value, recurrence, strength of the contractual evidence, likelihood of recovery, and time remaining under the applicable dispute process.

A small recurring variance affecting a high-volume procedure may be more significant than an isolated discrepancy on a single claim.

Similarly, a large payment difference may require immediate attention when a contractual deadline is approaching.

Step 5: Resolve Root Causes, Not Just Individual Claims

When multiple claims show the same pattern, investigate the underlying cause.

A recurring discrepancy may originate from a payer's processing configuration, an outdated internal fee schedule, incorrect coding, a misunderstanding of contract terms, or a charge-master issue. The resolution will differ depending on the cause.

Where appropriate, group substantiated discrepancies by payer, procedure family, and time period. A well-supported pattern can help the practice pursue a broader correction through payer relations rather than repeatedly treating each claim as an isolated incident.

Step 6: Measure Recovery and Prevent Recurrence

A mature process measures more than the number of claims appealed.

Useful indicators include:

• Potential underpayment value identified.
• Value substantiated after review.
• Amount recovered and recovery rate.
• Average time from identification to resolution.
• Recurring discrepancies by payer and procedure family.
• Dispute deadlines missed.
• Repeat errors after corrective action.

These indicators help management distinguish between a detection process that produces activity and one that improves realized revenue.

Turning Underpayment Data into Contract Negotiation Leverage

Underpayment analysis has value beyond recovering individual claims. It can reveal whether a payer relationship is performing as expected and where contract discussions may deserve attention.

Consider a dermatology group that repeatedly identifies reimbursement discrepancies involving the same procedure family. Before approaching the payer, the group can separate genuine contractual underpayments from valid adjustments, quantify the affected claims, and document the relevant contract language.

If the investigation confirms that the payer is applying the contract incorrectly, the practice has a stronger basis for requesting correction and evaluating whether similar claims require review.

If the payments are correct but the negotiated rates are no longer commercially attractive, the same analysis can support a different conversation: contract renegotiation.

This distinction is important. Contract enforcement recovers reimbursement already owed; contract negotiation seeks to improve the reimbursement terms themselves. Both benefit from accurate, payer-specific data, but they require different strategies.

What to Ask Your Medical Billing Partner

Dermatology practices should evaluate whether their revenue cycle management (RCM) partner actively monitors reimbursement accuracy after claims are paid.

Useful questions include:

• Are our commercial payer contracts and fee schedules maintained with appropriate effective dates and reimbursement rules?
• Do you compare expected and actual reimbursement at the service-line level, or primarily monitor whether claims were paid?
• How do you distinguish legitimate contractual adjustments from potential underpayments?
• Do you maintain a separate underpayment queue with ownership, supporting documentation, and deadline tracking?
• How much reimbursement was identified as potentially underpaid, how much was substantiated, and how much was ultimately recovered during the last reporting period?
• Can you identify recurring discrepancies by payer, procedure family, and reimbursement methodology?
• How do you verify that resolved issues do not continue to affect subsequent claims?

A partner that reports only denial rates, clean claim rates, or total collections may not provide sufficient visibility into contractual reimbursement accuracy. Those metrics remain valuable, but they do not independently establish whether paid claims were reimbursed correctly.

Bristol's Perspective: Revenue Integrity Beyond Claim Payment

At Bristol Healthcare, we view dermatology underpayments as part of a broader revenue integrity challenge. A successful revenue cycle is not defined solely by how many claims are submitted or paid. It also depends on whether reimbursement aligns with the applicable contractual terms and whether discrepancies are identified early enough to address them.

An effective approach combines accurate contract configuration, disciplined payment analysis, specialty-specific coding knowledge, and a clearly owned recovery workflow. For dermatology groups, this means paying particular attention to surgical services, multiple-procedure encounters, E/M reimbursement, and specialty medication claims where applicable.

It also means looking beyond individual claims. Recurring discrepancies can expose weaknesses in payer processing, internal billing configuration, or contract performance. When these patterns are documented and analyzed consistently, practices gain a stronger foundation for both reimbursement recovery and future payer negotiations.

The objective is not to challenge every adjustment. It is to ensure that legitimate adjustments are accepted, incorrect payments are investigated, and recurring problems are addressed at their source.

A paid claim should represent a completed reimbursement obligation—not an assumption that the right amount was paid.

For dermatology practices seeking greater visibility into their revenue cycle, a payer-by-payer reimbursement review can help establish where payment discrepancies exist, which ones are recoverable, and what operational changes could help prevent them from recurring.

Request a Revenue Cycle Diagnostic from Bristol Healthcare to explore opportunities to strengthen payment accuracy, improve reimbursement visibility, and protect the revenue your dermatology practice has earned.