An AR specialist in medical billing works the space between a submitted claim and a paid claim. That gap costs practices real money when nobody owns it. Every day a claim sits unworked in a queue, the odds of collecting full payment drop and once an account passes 120 days, many practices write it off as a loss.
This role exists because claims do not pay themselves. Payers deny, underpay, request additional documentation, or simply sit on claims past their processing window. Someone has to notice, follow up and push each account toward resolution. That someone is the accounts receivable specialist.
What an AR specialist in medical billing does
An AR specialist manages the accounts receivable ledger for a medical practice, health system, or billing company. Their job starts after a claim leaves the practice and continues until the balance is either paid, adjusted, or exhausted through appeals.
Day to day, this means pulling aging reports, calling payers, reviewing explanation of benefits (EOB) documents, correcting and resubmitting rejected claims and documenting every touchpoint in the practice management system. The work is repetitive by design. Consistency is what keeps AR from drifting upward.
A medical billing accounts receivable specialist typically does not perform original coding or initial claim submission. Those tasks usually sit with coders and front-end billers. The AR specialist picks up the account once it stalls, whether that means a payer processing delay, a coding-related denial, or a balance transferred to patient responsibility.
Medical billing AR specialist job description
Job postings for this role vary by employer size, but core expectations stay consistent across practices, billing companies and hospital systems.
Core daily responsibilities
- Reviewing AR aging reports and prioritizing accounts by dollar value and age
- Contacting payers by phone or through payer portals to check claim status
- Analyzing denial codes and determining whether a claim needs correction, appeal, or write-off
- Resubmitting corrected claims within payer-specific timely filing limits
- Posting adjustments and documenting account notes for audit purposes
- Escalating systemic denial patterns to billing management or coding staff
- Communicating with patients regarding outstanding balances when accounts move to self-pay
Required skills and certifications
Employers generally look for at least one to three years of medical billing experience, working knowledge of CPT, ICD-10 and HCPCS codes and familiarity with payer portals such as Availity or payer-specific systems. Job postings for AR-focused roles commonly ask for a strong working knowledge of medical billing, ICD-10/CPT coding and AR follow-up experience.
Certification is not legally required to work in medical billing, but it strengthens a candidate’s standing.
Certified Professional Biller (CPB)
The Certified Professional Biller (CPB) credential from the American Academy of Professional Coders covers billing processes, revenue cycle management and compliance, including claim submission, reimbursement and appeals.
Certified Medical Reimbursement Specialist (CMRS)
The Certified Medical Reimbursement Specialist (CMRS) credential, awarded by the Certifying Board of the American Medical Billing Association, recognizes competency across the claims paying process from the point of service through final balance resolution. Neither the CPB nor CMRS exam has a hard education requirement, though AAPC recommends an associate degree for CPB applicants.
Tools and software AR specialists use
Most AR specialists work inside a practice management system (Athenahealth, eClinicalWorks, Kareo, or similar) alongside a clearinghouse for claim status checks. Payer portals fill in gaps the clearinghouse cannot answer, particularly for prior authorization status and appeal deadlines. Larger operations often layer in AR-specific dashboards that flag aging buckets automatically instead of relying on manual report pulls.
Where the AR specialist fits in the revenue cycle
Revenue cycle management runs front to back: patient registration and eligibility verification, coding, claim submission, payment posting and finally, accounts receivable follow-up. The AR specialist sits at the back end, but their findings feed backward into the whole system.
When an AR specialist notices a payer repeatedly denying a specific CPT code for missing modifiers, that pattern needs to reach the coding team, not just get corrected claim by claim. A practice that treats AR as an isolated cleanup function misses this feedback loop and keeps generating the same denials month after month.
How an accounts receivable specialist in medical billing tracks aging claims
Reading an AR aging report (30/60/90/120-day buckets)
Aging reports group outstanding balances into buckets, typically 0 to 30 days, 31 to 60, 61 to 90, 91 to 120 and 120 plus. Every denied claim adds roughly 15 to 30 days to AR on average, which is why unresolved denials are the fastest way for a clean aging report to deteriorate.
A basic benchmark is for more than half of total accounts receivable to sit in the 0-30 day bucket, with each older category holding a progressively smaller share. The MGMA benchmark for AR older than 90 days runs around 13.5%, while HFMA guidance holds AR over 90 days below 10% of the total. Once an account crosses 120 days, the likelihood of collecting drops sharply and many practices write the balance off as uncollectible.
Prioritizing high-value and time-sensitive claims
Claim prioritization strategy
Not every account gets equal attention. AR specialists typically triage by two factors: dollar amount and how close a claim sits to its timely filing or appeal deadline. A $3,000 balance approaching a 90-day appeal window outranks a $40 balance with months of runway left, even if the smaller claim is older.
Denial follow-up and resubmission workflow
A structured follow-up cadence, often built around 7, 17 and 30-day check-ins on open claims, keeps accounts from aging silently. Without that structure, claims can drift from 30 days to 60 to 90 or more before anyone contacts the payer. MBW RCMMBW RCM
When a denial comes back, the AR specialist reads the denial code, determines the root cause (eligibility, coding, missing documentation, timely filing), corrects what can be corrected and either resubmits or appeals. Appeals require supporting documentation and a clear explanation of why the original decision was incorrect. Payers set their own appeal windows, commonly 60 to 180 days from the denial date depending on the contract, so tracking these deadlines is part of the job, not an afterthought.
Working with payers on underpayments and delayed claims
Denials are visible. Underpayments often are not, which makes them easy to miss. Practices that run quarterly payer variance reviews, comparing actual payments against contracted rates, collect 8 to 12% more per claim than those that skip this step and many recover $80,000 to $180,000 annually in underpayments once the process is in place.
An AR specialist flags these discrepancies by comparing the explanation of benefits against the practice’s fee schedule for that payer. A $15 gap on a single claim looks trivial. Across a thousand claims a year with the same payer, it is not.
How AR specialists reduce days in AR (DSO)
Days in AR, sometimes called days sales outstanding, measures the average time between billing a service and collecting payment for it. The industry benchmark for days in AR is under 40 days according to MGMA and top-performing practices operate at 30 to 35 days, with elite revenue cycle operations closer to 25 to 30 days. MGMA specifically identifies 45 days or less as an ideal DSO benchmark.
Benchmarks shift by setting. Physician groups typically run 30 to 40 days at best practice level with a 30 to 60 day range, multi-specialty clinics run 28 to 40 days and hospitals or health systems commonly land at 35 to 50 days with a range up to 70. Payer mix explains much of this spread; hospital-owned practices tend to carry more Medicaid patients and Medicaid processes claims more slowly than most commercial payers, which lengthens collection time.
AR specialists move this number by closing accounts faster rather than by working harder on any single claim. Submitting claims within 24 to 48 hours of service, resolving denials on the first follow-up attempt instead of the third and catching coding errors before resubmission all shave days off the average, even though no single action looks dramatic on its own.
Common challenges medical billing accounts receivable specialists face
AR specialists run into the same handful of obstacles across most practice types:
- Payers changing denial reasons between calls, which restarts the investigation
- Inconsistent documentation from providers that weakens appeal cases
- Timely filing deadlines that vary by payer and are easy to miss without a tracking system
- Patient balances that go uncollected because contact information is outdated
- High claim volume relative to staffing, which pushes lower-dollar accounts to the bottom of the queue indefinitely
That last point matters more than it looks. A practice with 5,000 open accounts and two AR staff members will always have a backlog. The accounts that never get worked are the ones that eventually get written off, not because they were unrecoverable, but because nobody had time to call.
AR specialist vs. medical biller vs. collections specialist
| Role | Primary focus | When they get involved |
|---|---|---|
| Medical biller | Claim creation and initial submission | Before the claim reaches the payer |
| AR specialist | Claim follow-up, denial resolution, payer negotiation | After submission, through final resolution |
| Collections specialist | Patient balance recovery, payment plans | After insurance processing, on patient-owed balances |
These roles overlap at smaller practices, where one person might handle all three. At larger operations, the separation lets each person build depth in their piece of the cycle instead of splitting attention across the entire process.
Metrics used to measure AR specialist performance
Practices typically evaluate AR staff and the broader AR function against a consistent set of numbers:
- Days in AR: under 40 days industry-wide, with top performers under 35 Ibntech
- Net collection rate: 96 to 97% indicates effective collection; 95% or below signals room for improvement Qualigenix
- AR over 90 days: kept below 10 to 15% of total receivables AMPM Billing
- Denial rate: an 8% denial rate benchmark, with lower considered optimal WhiteSpace Health
None of these numbers means much in isolation. A practice with a low denial rate but a high percentage of AR over 90 days likely has a follow-up problem, not a coding problem. Reading the metrics together points to where the actual breakdown sits.
When practices should outsource AR management
Outsourcing makes sense when in-house staff cannot keep pace with claim volume, when AR over 90 days consistently exceeds benchmark despite adequate staffing, or when a practice lacks the specialized payer knowledge needed for complex appeals. It makes less sense for practices with low claim volume and a well-functioning in-house process, since outsourcing adds a percentage-based cost that only pays off when it recovers more than an internal team would. Some practices split the difference, keeping routine follow-up in-house and sending aged accounts over 90 or 120 days to a specialized recovery vendor. This limits outsourcing costs to the accounts most likely to need outside leverage.
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