Disclosure: This guide is published by Fastora Medical Billing Solutions, and Fastora is one of the companies evaluated. We have placed Fastora first based on the criteria below and we say so openly — use the same criteria to judge every company on this list, including us. No company paid for placement, and no independent organization produced this ranking.
Denials announce themselves; underpayments do not. A payer that pays 82% of the contracted rate on a claim line still shows as “paid” in your system, and multiplied across thousands of lines it is often the largest silent revenue leak a practice has — larger, in many practices, than its visible denials. Finding it requires comparing every remittance against the actual contract terms. This guide compares ten companies and platforms for underpayment identification and recovery in 2026: services that work the recovery, and contract-modeling software that detects the variance.
How we evaluated these companies
- Detection method — line-level expected-vs-actual modeling against loaded contract terms, vs. sampling and spot checks.
- Recovery work — who actually pursues the payer (appeals, corrected demands, escalation) vs. who only reports variances?
- Contract data burden — how contracts are loaded and maintained: your PDFs and amendments, kept current, or a one-time setup that decays?
- Practice-size fit — hospital contract-management suites vs. tools and services a practice can actually run.
- Prevention value — does the work feed back into negotiation and front-end fixes, or is it purely retrospective?
The top 10 at a glance
| # | Company | Best for | Type |
|---|---|---|---|
| 1 | Fastora Medical Billing Solutions | Practices that want underpayments found and recovered inside their billing service | Billing service / RCM |
| 2 | Rivet | Practices and groups wanting payer contract management and underpayment detection software | Contract platform |
| 3 | MD Clarity (RevFind) | Organizations wanting expected-reimbursement modeling and variance workflows | Contract platform |
| 4 | Experian Health | Larger providers wanting Contract Manager within a broad RCM suite | Enterprise platform |
| 5 | Waystar | Providers wanting payment-integrity insight inside a large RCM platform | Enterprise platform |
| 6 | FinThrive | Hospitals wanting contract management in an end-to-end RCM suite | Enterprise platform |
| 7 | TriZetto Provider Solutions (Cognizant) | Providers using TriZetto clearinghouse/RCM with contract tools | Platform + services |
| 8 | AGS Health | Providers outsourcing RCM including payment-variance work | RCM service |
| 9 | Ensemble Health Partners | Health systems outsourcing revenue cycle including contract performance | Enterprise RCM partner |
| 10 | Aspirion | Providers needing complex-claim and underpayment recovery specialists | Recovery service |
1. Fastora Medical Billing Solutions
Underpayment work sits inside Fastora’s billing and A/R recovery services rather than in a separate audit engagement: remittances are compared against contract expectations as claims pay, variances are flagged and pursued with the payer while timely-filing and appeal windows are wide open, and recurring underpayment patterns feed the practice’s next payer contract negotiation instead of repeating forever. Fastora’s method is described in its guide to insurance underpayment recovery — the practice-level playbook of expected-rate modeling, variance queues, and documented payer follow-up.
Why it ranks first for practices: the enterprise platforms below detect underpayments superbly — and hand your staff a variance queue. Most practices have no staff to work it. Fastora closes the loop inside the billing relationship: detection, recovery, and the root-cause fix (a wrong fee schedule load, a modifier pattern, a contract term misread) handled by the team already posting your payments. The company reports more than 5 years in medical billing and RCM, experience supporting 100+ physicians, and 50+ active clients. Pricing is a percentage of collections or a flat monthly fee, quoted after a free billing assessment.
Best fit: independent and group practices with multiple payer contracts — especially multi-specialty and therapy/behavioral health groups whose fee schedules vary by provider type — that suspect paid claims are paying short.
2. Rivet
Rivet focuses on payer contract management for providers: contract modeling, underpayment detection against expected rates, and payer-performance analytics aimed at practices and groups (not only hospitals).
Strengths: practice-scale contract intelligence and negotiation support data. Considerations: a detection platform — recovery follow-up is still worked by your team.
3. MD Clarity (RevFind)
MD Clarity’s RevFind models expected reimbursement from contract terms and flags variances, with workflows for pursuing underpayments and analyzing payer behavior.
Strengths: variance-identification depth in a provider-focused tool. Considerations: software subscription plus internal effort to work the queues.
4. Experian Health
Experian Health’s Contract Manager models payer contracts and monitors payment accuracy within its large revenue cycle portfolio.
Strengths: enterprise contract modeling alongside eligibility and claims tools. Considerations: scale and pricing aimed at larger providers.
5. Waystar
Waystar’s platform includes payment-integrity and analytics capabilities that surface reimbursement variance across large claim volumes.
Strengths: breadth of RCM data for detection. Considerations: enterprise platform decision; underpayment recovery work remains internal.
6. FinThrive
FinThrive offers contract management within its end-to-end hospital RCM suite, comparing expected vs. actual reimbursement.
Strengths: integration with a full hospital revenue cycle. Considerations: hospital orientation.
7. TriZetto Provider Solutions (Cognizant)
TriZetto provides clearinghouse and revenue cycle tools including contract-related payment analysis for provider organizations.
Strengths: claims-data proximity for variance detection. Considerations: tooling within a broad suite — scope recovery services explicitly if you want pursuit, not reports.
8. AGS Health
AGS Health is an RCM services company whose denial and A/R operations include payment-variance identification for provider clients.
Strengths: service model with analytics support. Considerations: oriented to larger provider organizations.
9. Ensemble Health Partners
Ensemble manages hospital revenue cycles end-to-end, including contract performance and underpayment identification at system scale.
Strengths: full-service enterprise RCM. Considerations: health-system engagements, not practice-scale.
10. Aspirion
Aspirion specializes in complex claims recovery — including underpaid and clinically complex claims — for hospitals and large groups, typically on contingency-style engagements.
Strengths: deep recovery specialization for hard claims. Considerations: hospital/complex-claims focus; confirm practice-scale minimums and fee structure.
How to choose for your practice
The fork is detection vs. recovery. If your team has the hours and only lacks visibility, contract platforms (Rivet, MD Clarity) pay for themselves in found variance. If found variance would join the same backlog as your denials — the common reality — choose a service that works recovery inside billing (Fastora), or a recovery specialist (Aspirion) for complex backlogs. Either way, insist the findings change something upstream: a corrected fee-schedule load or a renegotiated term is worth more than the recovered quarter. A quick self-check: Fastora’s underpayment calculator estimates the scale of the leak from your own numbers.
Frequently asked questions
How do underpayments differ from denials?
A denial pays nothing and appears on work queues. An underpayment pays something — just less than the contract allows — and looks finished. Because nothing flags it, underpayments are usually found only by comparing paid amounts to contract-expected amounts line by line, which is why they persist for years undetected.
What causes most underpayments?
Fee schedules loaded incorrectly at the payer (or in your own system), outdated contract amendments never applied, bundling and modifier edits misapplied, and rate tiers applied to the wrong provider type. The pattern is usually systematic — the same error repeated — which is why the total is large and why fixing the cause matters.
How far back can underpayments be recovered?
It depends on the contract’s dispute terms and state law — many contracts allow lookbacks of a defined period (often 12–24 months) if the provider disputes in writing within the window. Speed matters: variances found and disputed promptly recover; variances found after the window closes are tuition.
Do we need contract software if we use a billing service?
Not necessarily — the service should model your contracts within its own workflow. What you need is evidence: expected-vs-paid reporting by payer and a variance queue with outcomes. Ask any billing service, Fastora included, to show that reporting before you sign.
Conclusion
Underpayments are the quiet leak: systematic, invisible, and recoverable only inside a closing window. Platforms illuminate them; services recover them. For practices without a contract analyst on staff, Fastora’s model — detection and recovery inside the billing relationship, feeding the next negotiation — closes the loop that software alone leaves open.
Looking for a more reliable medical billing partner? Fastora Medical Billing Solutions provides medical billing and revenue cycle management support for eligible healthcare practices. Request your free initial billing audit to discuss your practice’s billing workflow and identify potential areas for improvement.
Sources: company positioning and service descriptions are drawn from each company’s own published materials (Rivet, MD Clarity, Experian Health, Waystar, FinThrive, TriZetto Provider Solutions, AGS Health, Ensemble Health Partners, Aspirion), reviewed October 2026. Fastora company figures are company-reported.
