What days in A/R actually measures
The formula is simple: total outstanding A/R ÷ average daily charges. If a practice carries $450,000 in receivables and generates an average of $15,000 in charges per day, its days in A/R is 30. The metric answers a single question: if no new charges were created, how many days would it take to collect everything currently outstanding?
Two clarifications matter. First, use charges in the denominator — some versions use revenue, which distorts comparisons across practices with different contractual write-off profiles. Second, keep patient balances in scope. A practice can run tight insurance A/R and still be slow overall because patient balances age quietly; MGMA has documented practices holding insurance A/R near 28 days while patient balances pulled the overall result past 30.
The benchmarks: what good actually looks like
Commonly cited HFMA MAP Keys-aligned guidance puts days in A/R at 30–40 days for most outpatient practices, with under 35 considered best-in-class and up to 50 tolerable for some small or specialty practices. The same benchmarking family holds that no more than 10–15% of receivables should sit in the 90+ day buckets.
Direction matters as much as level. MGMA's 2026 polling found days in A/R holding roughly steady for most practices — but with payer pressure rising underneath, meaning flat results now take more work than flat results did two years ago. The practices staying flat described the same disciplines: clean claims, next-day submission, experienced staff, consistent denial follow-up, and time-of-service collections.
“48% of leaders named denials and appeals their practice's largest source of revenue leakage, compared with 23% who cited front-end issues.”
Why A/R ages: the four leaks
Receivables age from four predictable sources, and each has a distinct fix:
- Charge lag: the gap between the date of service and the date charges are posted. MGMA describes sector charge lag running 3–7 days from visit to submitted claim; same-day charge entry resets the clock at its source.
- Rejection loops: claims that bounce at the clearinghouse and sit in an unworked queue. Each cycle adds a week or more before adjudication even begins.
- Unworked denials: adjudicated non-payments that enter a pile instead of a queue. With fewer than 1% of denied claims ever appealed (KFF, 2026), most denied revenue is simply written off.
- Patient balances: responsibility amounts that never get a structured billing cadence and drift into the oldest buckets.
The 90-day cliff
Age is not linear in recovery terms. A claim at 45 days is a normal work item. A claim at 100 days is a different financial object: appeal deadlines are closer or gone, timely-filing windows are near their end for many payers, and the operational cost of recovery rises with every touch.
Medicare's outer boundary is one calendar year from the date of service under 42 CFR § 424.44, but commercial windows commonly run 90–180 days per contract — shorter, stricter, and easy to miss at scale. An MGMA Stat poll of medical groups found most practices wait 91–120 days before sending bills to collections at all, which is precisely when recovery odds are already collapsing. The lesson is structural: A/R work must happen while claims are young, because the alternative is chasing money that can no longer be collected.
How to reduce days in A/R: the six levers
Every point of improvement comes from one of six levers, and they compound:
- Same-day charge entry: close encounters within 72 hours and post charges within two days.
- Next-day claim submission: scrub and transmit within 24–48 hours — the age clock starts ticking at submission, not at the visit.
- Daily rejection triage: correct clearinghouse rejects the day they appear.
- Daily denial work: classify and appeal within 48 hours; never let denials age in a pile.
- Time-of-service collections: collect copays and verified patient responsibility before the visit ends — MGMA Better Performers data shows top practices collect time-of-service copays at rates 16–36.5% higher than peers.
- Monthly aging review: read the A/R aging report by payer, not just in aggregate, and hold the 90+ day buckets to under 10–15%.
What healthy aging looks like by bucket
Total days in A/R hides where the money is stuck. The aging distribution tells you whether you have a submission problem, an adjudication problem, or a collection problem.
| Aging Bucket | Healthy Target | What It Signals |
|---|---|---|
| 0–30 days | The largest share of A/R | Claims moving normally through adjudication |
| 31–60 days | Shrinking steadily | Payer processing or first-level follow-up |
| 61–90 days | Small and actively worked | Denial/underpayment recovery territory |
| 90+ days | Under 10–15% of total A/R | Recovery risk zone — appeal and filing deadlines |
Targets reflect commonly cited HFMA MAP Keys-aligned ranges for outpatient practices.
Making the number move — and keep moving
Days in A/R improves when the daily cadence improves: charges posted same day, claims out in 24–48 hours, rejections triaged immediately, denials appealed in 48 hours, and patient balances billed on a structured cadence. That is the operating loop EntireRCM runs inside your EHR — and it is why client practices average 22 days in A/R against a 30–40 day benchmark.
If your own number has been drifting, the free audit starts with an A/R aging analysis by payer: where the balance sits, which claims are still recoverable, and which are approaching a filing wall. See practice analytics for the reporting side, or request the audit to get your practice-specific numbers.