Streamlining Accounts Receivable in Nephrology Practices
- Sirius solutions global
- Mar 23
- 8 min read
Your Nephrologist Saw 18 Patients Today. Your Billing Team Collected Money for 14 of Them.
The other four? Still in the system somewhere. Aging.
That is not a rough estimate. It is the average collection gap in nephrology practices that do not have an optimized AR workflow. Roughly 20 to 25 percent of earned nephrology revenue does not collect on time and a meaningful portion of it does not collect at all.
The clinical work happened. The documentation exists. The claims were submitted. Somewhere between submission and payment, the money got stuck. And the practice moved on to the next day of seeing patients, not realizing that every day it moves forward without working out what is behind it, the recovery probability drops.
Imagine a claim for an ESRD capitation visit. It was submitted 47 days ago. It is not denied. It is not paid. It is sitting in a payer system in "pending" status, waiting on a face-to-face documentation request that the payer sent to a fax number that is no longer monitored. Nobody at the practice knows the request exists. In 43 more days, that claim hits the timely filing window. Then it is gone.
Now imagine 12 of those claims, across three payers, in different stages of the same invisible failure.
That is a normal month for a nephrology practice without active AR follow-up.
Here is what separates the practices collecting 92 cents on the dollar from the ones collecting 78 cents: not the codes they use, not the volume of patients they see, not the payer mix they work with, how aggressively and how systematically they go after the money that is already in the pipeline.
The practices losing that revenue are not losing it to bad luck. They are losing it to the absence of a daily, weekly, monthly discipline around AR that treats outstanding claims as active work, not background noise.
"AR management is not about preventing problems. It is about refusing to accept them once they exist. The practices that win on collections are the ones who treat every aging claim like a conversation that has not been finished yet."
There is no alert in the billing software when revenue quietly stops moving. These three patterns drain nephrology AR consistently and they do it silently.
Leak One: The Capitation Lag That Nobody Owns
ESRD monthly capitation billing works on a 30-day billing cycle. The claim for January services goes out in early February. The payer takes 20 to 30 days to adjudicate. If it denies, for a visit count mismatch, a documentation gap, a classification error, the denial lands in late February or early March. By then, the billing team had moved on to February and March patients. The January denial sits untouched for two weeks while the team processes current volume. Then another two weeks pass. The appeal window is 60 days. They have now used 30 of them doing nothing.
The capitation cycle creates a built-in lag between denial and urgency that swallows recoverable revenue in plain sight.
The fix is not more staff. It is a denial calendar, a system that triggers a mandatory review action the moment a denial arrives, regardless of what month's services it covers.
Leak Two: The Secondary Claim That Never Followed the Primary
ESRD patients frequently carry Medicare as primary with a secondary payer, Medicaid, a Medigap plan, or an ESRD-specific supplemental. When the primary adjudicates and pays, the secondary claim needs to submit within the secondary payer's timely filing window, which in many cases is 90 days from the primary EOB date.
Most billing teams submit the secondary eventually. The ones losing money are the ones submitting it at day 75, 80, or 85, after the primary EOB sat in a queue for six weeks before anyone processed it. Or worse: the primary pays, the billing team marks the claim resolved, and the secondary claim never gets filed at all because the practice does not have a reliable secondary claim trigger in its workflow.
The secondary claim is not new revenue. It is cost-sharing and supplemental coverage the practice is owed. It is also the revenue category most easily lost to timing failures because the primary payment creates a false sense that the claim is closed. It is not closed. It is half-paid.
The fix: Secondary claims submitted within 48 hours of primary EOB receipt, automated or manually assigned, but tracked with the same urgency as a primary claim. Every ESRD patient with dual coverage has an open secondary claim on file until the secondary pays or explicitly denies. Not until someone gets around to it.
Leak Three: The Underpayment Everyone Accepted
A payer pays $162 on a claim where the contracted rate or expected Medicare allowable is $194. The payment posts. The claim closes. Nobody flags it because $162 looks like a payment, not a problem.
Multiply that across a nephrology practice billing 300 to 400 claims per month even if only 15 percent of claims carry underpayments, and even if the average underpayment is only $28, that is approximately $1,680 to $2,240 per month in revenue that posted as correct and was never disputed.
Over a year: $20,160 to $26,880. Gone. Not denied. Not written off. Just accepted.
Most nephrology practices do not audit for underpayments. Most do not even know their contracted rate by payer well enough to identify when one has been shorted. That is precisely why this leak continues unchallenged month after month.
Two nephrology groups in the Dallas-Fort Worth area. Both seeing ESRD and CKD patients. Both billing Medicare, Medicaid, and commercial. Both running three physicians and one APP.
Practice A — AR days averaging 68. Monthly write-offs at 4.2% of net revenue. Denial rate at 17%. The billing team says the payers are difficult. The physicians say the billing seems fine because the claims are going out. Nobody has pulled a payer-by-payer breakdown of denial categories in the last 12 months. Nobody has checked whether capitation codes are being reconciled to actual visit counts. Nobody knows what the underpayment rate is because underpayments post as payments and nobody looks twice.
Practice B — AR days averaging 39. Monthly write-offs at 1.1%. Denial rate at 6.8%. The billing team reviews AR aging weekly. Every denial has a category tag and a due date. Underpayment disputes are filed within 30 days of identification. Capitation codes are reconciled to documented visit counts before submission.
Same patients. Same payers. Same services.
The revenue difference between these two practices, expressed as a percentage of net patient revenue collected, is approximately 9 to 11 percentage points. At $2.8 million in annual billing, that gap is between $252,000 and $308,000 per year.
Practice A does not have a revenue problem. It has a workflow problem.
"The gap between what nephrology practices bill and what they collect is almost never a payer problem. Payers adjudicate by rules. The practices that understand those rules collect what they bill. The ones that do not, write it off and blame the system."
Not frameworks. Not checklists. The actual daily operations of a nephrology practice running AR correctly.
Monday morning: AR aging is pulled. Every claim crossing 60 days since last week's review is individually opened and status-checked against the payer portal. Any claim with a pending documentation request that has not been responded to gets flagged for immediate action because a documentation request the practice never answered is not a payer hold. It is a payer waiting to deny. Claims entering the 90-day window get emergency priority: filing window calculated, appeal status confirmed, every document on file reviewed.
Throughout the week: Every denial that lands gets logged, categorized, and assigned within 24 hours. The category determines the action, not the billing team's discretion. Medical necessity denial on a CKD management visit? Clinical documentation gathered, appeal drafted using the payer's specific medical necessity criteria language, not a cover letter restating the claim. Capitation code mismatch? Actual visit count pulled from the clinical record, correct code identified, resubmission with chart documentation attached. Authorization denial? Retro-auth requests are filed immediately, not when someone gets to it, immediately, because retro-auth windows close and most practices miss them.
Monthly: Every paid claim over $150 is compared against the expected payment, contracted fee schedule for commercial payers, Medicare allowable for Part B claims. Any claim paying below 95% of the expected rate gets a formal payment dispute filed. Not a call. A written dispute with the contract language or fee schedule attached. The overturn rate on underpayment disputes is tracked. The recovered dollar amount is reported. The total across 12 months is not a rounding error.
Quarterly: Every write-off from the prior quarter is categorized, contractual adjustment, bad debt, or non-contractual. The non-contractual category gets a root cause review. If the same root cause appears more than three times, it becomes a process change, not an absorbed cost. Write-offs that stop being tracked stop being prevented.
This is not extraordinary operational performance. It is what discipline looks like when it is applied to AR consistently, not heroically, consistently.
Most nephrology practices frame AR management as a cost center, staff time, software, processes that generate overhead without directly producing revenue.
Flip that frame.
What are your current AR days? Subtract 38 from that number. Multiply the result by your daily net revenue.
That number, right there, is the working capital currently tied up in your AR system beyond where it should be. Not lost. Not written off. Just sitting in the pipeline waiting for someone to move it.
For a $2.5 million practice with AR days of 65, that calculation looks like this:
(65 – 38) × ($2,500,000 ÷ 365) = 27 × $6,849 = $184,932
Nearly $185,000 in working capital that the practice has earned but does not yet have access to because the AR system is not moving it fast enough.
AR management is not overhead. At that scale, it is the most high-return operational investment the practice can make.
There is a version of this that involves hiring, training, software licenses, and workflow redesigns that take 6 months to show results. And there is the version where you partner with a team that already built all of that for nephrology specifically.
At Sirius Solutions Global, nephrology AR is not a billing add-on. It is a specialty function, built on real knowledge of ESRD capitation cycles, dual-payer coordination, Medicare allowable comparison, and denial category triage specific to nephrology payer policies.
Our nephrology clients do not wonder what is in their 90-day bucket. They know because we tell them before the claim ages, not after the window closes.
What working with Sirius looks like for nephrology practices:
AR days averaging 37 to 42 for Medicare claims
Underpayment identification and dispute on every paid claim below contracted rate
Capitation code reconciliation every billing cycle, no surprises on audit
Secondary claim submission within 48 hours of primary EOB receipt
Write-off authorization required and tracked non-contractual write-offs reviewed for root cause every quarter
The $185,000 sitting in that working capital calculation above? Most of it is recoverable. We know how to move it because we have done it for nephrology practices running the same denial patterns, the same capitation miscodes, the same secondary claim abandonment issues that are sitting in your system right now. The path from where your AR is to where it should be is not mysterious. It just requires the right workflow, applied without exception.
We pull your current AR aging, run the working capital calculation against your actual billing volume, and show you specifically what is recoverable and on what timeline. Thirty minutes. No commitment.
