What Does a Medical AR Specialist Do? Accounts Receivable Career Guide

In medical billing, accounts receivable (AR) is the money a provider has earned by treating patients but has not yet been paid.

It stays on the books from the moment a claim goes out the door until the balance is paid, adjusted or written off.

AR work divides by who owes.

Insurance AR is claims and claim balances still sitting with payers.

Patient AR is what the remittance moves to the patient — an 835 flags that share with the PR (patient responsibility) group code.

Insurance AR is time-sensitive, because payers enforce filing deadlines.

Under 42 CFR 424.44(a)(1), a Medicare claim for services furnished on or after January 1, 2010 must be filed no later than 1 calendar year after the date of service, with limited exceptions.

Federal Medicaid rules set a maximum of their own: 42 CFR 447.45(d)(1) requires state Medicaid agencies to make providers submit all claims no later than 12 months from the date of service.

Commercial payer deadlines come from each payer's contract or state law, and our research verified no single window that covers them, so AR staff confirm each payer's rule instead of assuming one.

Money gets stuck in known places.

After a claim is submitted, the payer pays it, denies it, or rejects it as unprocessable.

CMS's Medicare Claims Processing Manual says a Medicare claim returned as unprocessable for incomplete or invalid information is not considered a claim, is not denied, and has no appeal rights — the fix is to correct it and resubmit.

A denial is the other outcome: the payer processed the claim and refused payment, which is what creates appeal rights.

Payment, when it comes, arrives on the ASC X12 835 electronic remittance advice, and every adjustment on it carries a group code — CO (contractual obligation), OA (other adjustment), PI (payor-initiated reduction) or PR (patient responsibility).

Those codes are how an AR specialist sees, line by line, who still owes what.

HFMA publishes a set of revenue-cycle metrics called MAP Keys.

They include net days in accounts receivable, aged A/R as a percentage of total and billed A/R overall and by payer group, denial write-offs, bad debt, net days in credit balance, and cost to collect.

Definitions are published; our research did not confirm an agreed industry target for any of them, so treat benchmark numbers with care.

Working the whole aging spectrum is the AR job; working only denied claims is the denial management specialist's.

The closest occupation BLS publishes for this work is billing and posting clerk (SOC 43-3021), a group that spans every industry.

BLS describes these clerks as workers who calculate charges, generate bills, review documents such as hospital records to calculate fees, and contact customers to get or give account information.

A medical AR specialist applies that job to unpaid insurance claims and patient balances.

Day to day, the work runs through a recognizable set of tasks:

• Work the insurance aging queue. Review unpaid claims oldest-first or by balance, check claim status in the practice-management system, on payer portals and by phone, and document every call with a reference number.
• Chase claims that are pending too long. Payers owe providers timing discipline too. For Medicare, contractors may not pay a clean claim before a payment floor of 13 days after receipt for electronic claims (26 days for paper claims), per Pub. 100-04, ch. 1, §80.2.1.2. Clean claims must then be paid or denied within 30 days under the Medicare Claims Processing Manual (Pub. 100-04, ch. 1, §80.2.1.1), with interest owed past that ceiling.
• Fix and resubmit rejected claims. Because a rejected claim never entered adjudication, a fast correction and resubmission is what protects the filing deadline.
• Track filing deadlines claim by claim. Medicare's window is 1 calendar year from the date of service; missing it is the outcome AR follow-up exists to prevent.
• Start the first appeal when a claim denies. For Medicare that is a redetermination: a written request on form CMS-20027 or by letter within 120 days of receiving the initial determination, with no minimum dollar amount required. Medicare presumes the determination arrived 5 calendar days after the notice date. Deeper appeal levels go beyond first-level follow-up — that is denial-management work.
• Act on what the remittance shows. Per CMS, group codes assign responsibility for the unpaid balance: PR to the patient, which moves it to the patient-statement side, and CO to the provider. A Medicare beneficiary may be billed only for adjustments carrying PR.
• Protect patient information while you work. HIPAA's minimum necessary standard (45 CFR 164.502(b)) requires covered entities and business associates to make reasonable efforts to limit protected health information to the minimum necessary when using, disclosing or requesting it. That is a live constraint every time you call a payer about a named patient.

In a smaller office this seat can blend into the medical biller's job, with one person building claims and working the AR that follows.

Larger organizations can split follow-up, denials and posting into dedicated seats — posting incoming payments is its own role, the payment poster.

Provider-side AR seats sit in physician practices and specialty groups, hospitals and health systems, ambulatory surgery centers, and medical billing companies and RCM vendors that run billing for many practices at once.

The payer side of the table is its own job — claims processors work for insurers, not for the practice waiting on payment.

BLS's Employment Projections put 178,100 of the 418,000 billing and posting clerk jobs in 2025 in healthcare and social assistance — 42.6% of the occupation.

Healthcare employment of these clerks is projected to grow 6.6% to 190,000 by 2035, even as the occupation overall stays flat.

Those counts cover the whole occupation in every industry, so read them as the shape of the field, not a headcount of AR specialists.

The setting changes the shape of the seat.

A physician practice gives you a smaller portfolio and most of the cycle in one chair.

A hospital AR team is larger, with work divided by payer or account type.

A billing company portfolio spans many practices and payer mixes, which is a fast way to learn how differently payers behave.

The job's raw materials — a queue, a phone, a payer portal and a practice-management system — travel well.

What our research did not verify is the share of AR postings that are remote, so judge each listing on what it says about location.

BLS lists communication skills, math skills and organizational skills as the important qualities for financial clerks, the group that includes billing and posting clerks.

AR follow-up leans on all three at once: you explain a claim problem to a payer rep in plain language, reconcile a balance to the penny, and keep a queue of open accounts moving without losing track of one.

• Insurance literacy. Eligibility, benefits, coordination of benefits, and reading a remittance accurately — the vocabulary payer conversations run on.
• Payer phone craft. Calling about one specific claim, getting a reference number, and writing down what the payer promised and by when.
• Deadline discipline. Filing windows, appeal windows and resubmission timing, tracked claim by claim.
• Systems fluency. Practice-management systems, clearinghouse rejection reports and payer portals are where the work actually happens.
• Composure. Unpaid money frustrates people on both ends of the call — clinical staff who want answers and payer reps working their own queues.

On education, BLS says financial clerks typically need a high school diploma or equivalent and learn their duties through on-the-job training.

Postings are where the rest shows up — the systems, the payer mix and the experience a specific employer wants.

Two credentials from the billing side cover overlapping ground.

Per AAPC's outline, its Certified Professional Biller (CPB) covers claim submission for commercial payers, Medicare and Medicaid; coordination of benefits, medical necessity and prior authorization; denials, appeals, payment posting, reconciliation and collections; and HIPAA and fraud-and-abuse compliance.

HFMA describes its Certified Revenue Cycle Representative (CRCR) as a national-level certification on the patient-centric revenue cycle.

A credential is not a license.

BLS has no separate code for medical billers, so the closest published group for this work is billing and posting clerks (SOC 43-3021, all industries).

In the BLS Occupational Employment and Wage Statistics for May 2025, that group's median annual wage was $48,500, and the median hourly wage was $23.32.

Read it as an umbrella over billers, AR staff, payment posters and charge-entry staff in every industry — not as a medical-AR-specific figure.

The full national spread for the group is wider.

Annual wages ran $37,290 at the 10th percentile, $42,840 at the 25th, $58,290 at the 75th and $67,710 at the 90th in the same May 2025 OEWS data.

The projected outlook is flat overall but warmer where you would sit.

BLS projects billing and posting clerk employment to be essentially flat from 2025 to 2035: 418,000 jobs in 2025 against 417,700 in 2035.

BLS expects employment to rise in fast-growing healthcare industries, while automated invoice processing software raises productivity and reduces overall growth for the occupation.

From this seat the path runs toward denial management work, then billing supervision and revenue-cycle management.

BLS notes that some medical and health services managers begin their careers as medical records specialists, administrative assistants or financial clerks in a healthcare office.

No pay survey specific to medical AR specialists appears in this page's sources, so the honest picture is the labeled group median above plus whatever a specific posting discloses.

Search under the titles employers actually post: accounts receivable specialist, AR specialist, AR follow-up specialist, and insurance follow-up specialist.

On this board those spellings route to one role page, so you can browse medical AR specialist jobs without guessing which title a practice used.

Before you apply, refresh the specifics interviewers probe: the Medicare filing and redetermination windows from this page, your state's Medicaid rule, and the story of one aged claim you worked to resolution.

That specificity is what an AR interview is built to find.

On the employer side?

Hiring AR staff? Post a job and put the opening in front of the billers, coders and revenue-cycle staff who browse this board.

Career information, not coding, billing-compliance, legal or tax advice — confirm filing deadlines, appeal windows, payment rules and credential details with CMS, your Medicare Administrative Contractor, the payer or the credentialing body named.