Days in A/R formula and target
Days in A/R = Total Accounts Receivable / Average Daily Charges (where Average Daily Charges = Total Charges over the trailing period / Number of days in that period). MGMA's better-performing practice benchmark is 35 days. HFMA's published target is under 40 days. Above 50 days indicates a structural collection problem — usually denial rework backlog, aged self-pay, or front-end eligibility gaps producing rejections.
- Formula: Total A/R / Average Daily Charges
- MGMA better-performer median: 35 days
- HFMA target: under 40 days
- Above 50 days: structural collection issue
Days in A/R: Formula, Benchmark, and the Four Levers
By MedPrecision Operations Team · Published
Days in Accounts Receivable measures how long it takes a practice to collect what it has billed. It is the single most diagnostic revenue cycle metric — a single number that tells you whether your billing process is healthy or broken. The MGMA Cost and Revenue Survey reports the median across better-performing practices at 35 days; the worst-performing quartile sits above 60 days. This guide covers the formula, the source benchmarks, and the four specific levers that reduce the number.
The Formula
Days in A/R = Total Accounts Receivable / Average Daily Charges. Average Daily Charges = Total Charges over the trailing measurement period (typically 90 days) / Number of days in that period (90). The reason for using a trailing 90-day window for the denominator rather than a single month is to smooth the month-over-month variance from holiday weeks, seasonal volume, and payer cycle effects. A practice with $900,000 in trailing-90-day charges has $10,000/day in average daily charges; if total A/R is $350,000, days in A/R = 35. The formula is published in this form by HFMA in the MAP Keys methodology and by MGMA in its annual Cost and Revenue Survey methodology.
Benchmark Sources
MGMA's 2024 Cost and Revenue Survey reports the median Days in A/R at 36 days for better-performing physician practices and 47 days for the broader sample. HFMA MAP Keys lists the standard target as under 40 days. AAPC's 2023 medical billing salary and workplace survey reports an industry mean closer to 42 days when including all practice sizes. By specialty: primary care typically runs 28-35 days, mental health 30-40 days, surgical specialties 40-55 days (longer because of pre-authorization and case rate adjudication delays), and DME/home health 50-70 days because of the extensive documentation cycles and recurring claim structure. Specialty drift matters when interpreting a single number — a 50-day Days in A/R is elevated for primary care and normal for an orthopedic surgical group.
Aging Bucket Interpretation
Days in A/R is a single rolled-up number; the aging bucket distribution under it reveals the underlying health. Standard buckets are 0-30, 31-60, 61-90, 91-120, and 121+ days. A healthy practice keeps roughly 65-75% of total A/R in 0-30 days, 12-18% in 31-60, 6-10% in 61-90, and under 12-15% combined in 91+. A practice with the same 38-day average but 25% of A/R sitting over 90 days has a denial rework backlog masked by recent charge volume — the average looks fine because new claims are paying, but the aged tail is unrecovered. Conversely, a practice with 44 days but only 8% over 90 has a slower payer mix (more Medicaid, more secondary COB) but no actual collection failure.
The Four Levers That Reduce Days in A/R
Lever 1: Clean claim rate. Every percentage point of CCR improvement removes about 0.3-0.5 days from the average because rework adds 30-60 days to a touched claim's collection cycle. Lever 2: Days from charge to submission. The HFMA target is under 5 days; many practices run 8-12. Reducing charge-to-submission lag from 10 to 4 days takes 6 days off Days in A/R directly. Lever 3: First-pass appeal velocity on denials. Denials over 60 days old recover at half the rate of denials worked within 14 days. Lever 4: Self-pay collection process. Self-pay balances over 90 days drag the average up sharply because the underlying recovery rate is in the 18-22% range without active collection. A patient statement cycle issued on day 5 post-EOB with a 30-day follow-up cadence reduces self-pay aging materially.
Days in A/R by Payer Class
Average payment turnaround varies sharply by payer class and is built into the achievable Days in A/R floor. Commercial payers (UnitedHealthcare, Aetna, Cigna, BCBS plans) average 15-22 days from clean submission to payment. Medicare Fee-for-Service averages 14 days under the 14-day Medicare prompt-pay rule (electronic claims). Medicaid varies by state — California Medi-Cal averages 30-45 days, New York Medicaid 25-35 days, Texas Medicaid 21-28 days, with some state programs (Tennessee TennCare MCOs) under 21 days. Workers' comp claims often run 60-120 days because of fee schedule disputes and documentation requirements. Self-pay balances follow a different curve entirely — the average self-pay balance over 60 days collects below 35% under standard internal collection workflows.
Common Diagnostic Patterns
Pattern 1: A/R is rising, charges are flat. This indicates a denial backlog or appeal queue not being worked. Compare 90+ day A/R as a percentage of total A/R against the prior period — a rising 90+ percentage with flat charges is a denial recovery failure. Pattern 2: A/R is rising in proportion with charges. This is volume growth, not a process problem; the absolute dollar number rises but the days metric stays flat. Pattern 3: Days in A/R drops sharply month-over-month. Usually indicates either large lump-sum capitation or risk payment, large recoupment offset, or large write-off cleanup — none of which reflect operational improvement. Pattern 4: Days in A/R rises after a payer policy change (e.g., new prior authorization requirement). Drill into denial codes — CARC 197 spike confirms the cause.
Computing Days in A/R the Wrong Way
Three common errors distort reported Days in A/R. First, using a 30-day denominator rather than a 90-day rolling window — this makes the metric whipsaw on monthly volume changes and produces meaningless month-over-month comparisons. Second, including credit balances (negative A/R from overpayments awaiting refund or recoupment) in the numerator without netting them out — credit balances are not collectable A/R and including them understates the true number. Third, using gross charges rather than net charges as the denominator. The HFMA-aligned method uses gross charges in both numerator and denominator (so the ratio is consistent), but some systems mix gross charges in the denominator and net A/R in the numerator, distorting the result by 5-15%.
Common Questions
Common questions about days in a/r: formula, benchmark, and how to reduce it.
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Get a Free Billing Audit arrow_forwardWhat is the formula for days in accounts receivable?
Days in Accounts Receivable equals Total Accounts Receivable divided by Average Daily Charges, where Average Daily Charges equals Total Charges over the trailing 90 days divided by 90. The trailing 90-day window in the denominator smooths month-over-month volume variance. A practice with $900,000 in trailing-90-day charges averages $10,000 per day in charges; if the current total A/R balance is $350,000, Days in A/R equals 35. HFMA publishes this formula as the standard methodology in the MAP Keys revenue cycle KPI definitions, and MGMA uses the same formula for its Cost and Revenue Survey benchmarks. Computing it with a 30-day denominator rather than 90 produces a more volatile number that is harder to compare period-over-period.
What is a good days in A/R benchmark?
MGMA's 2024 Cost and Revenue Survey reports the median Days in A/R at 36 days for better-performing physician practices and 47 days for the broader sample. HFMA MAP Keys publishes a target of under 40 days. The benchmark varies by specialty — primary care typically runs 28-35 days, surgical specialties 40-55 days because of pre-authorization and case-rate adjudication delays, mental health 30-40 days, and DME or home health frequently 50-70 days. A practice operating consistently above 50 days in a specialty whose benchmark is 35 has a structural collection problem — usually a combination of low clean claim rate, slow charge-to-submission cycle, and unworked aged denials sitting in the 90+ bucket.
How does aging bucket distribution affect days in A/R?
Days in A/R is the rolled-up average; the aging bucket distribution shows whether the average is healthy or hides an aged tail. A practice with 65-75% of A/R in 0-30 days, 12-18% in 31-60, 6-10% in 61-90, and under 15% combined in 91+ days has a healthy distribution. Two practices can both report 38 Days in A/R while one has 70% in 0-30 (healthy) and the other has 25% in 91+ (denial backlog masked by recent volume). Always read aging distribution alongside the headline number. The 91+ bucket as a percentage of total A/R is the most diagnostic single secondary metric — HFMA's MAP Keys list the target at under 12% for that bucket.
Why does Medicare days in A/R run lower than commercial?
Medicare Fee-for-Service is bound by the 14-day clean claim payment rule for electronic claims, meaning a Medicare claim that adjudicates clean is paid within 14 calendar days. Commercial payers operate under varying prompt-pay laws by state, generally 30-45 days for clean claims. The result is that Medicare's payment turnaround anchors the lower end of average payer-class A/R (around 14-18 days from submission to ERA receipt), while commercial averages 18-25 days. In a practice with a heavy Medicare patient mix, this naturally pulls Days in A/R toward the lower benchmark; in a commercial-heavy mix, the natural floor is 25-30 days regardless of process improvement.
Should I include patient balances in days in A/R?
Yes — the HFMA MAP Keys formula includes total accounts receivable (insurance plus patient) in the numerator. However, segmenting A/R into insurance A/R and patient A/R and tracking each separately is operationally more useful because the recovery curves differ sharply. Insurance A/R recovers at a much higher rate within 30 days. Patient A/R follows a different curve — the AHA and HFMA both report self-pay collection rates dropping below 35% once balances pass 60 days. A high overall Days in A/R with healthy insurance aging and aged self-pay is a different problem than a high overall Days in A/R with aged insurance denials. Track both, and resolve them with different workflows.
How quickly can days in A/R be reduced?
Most practices see 5-10 days of improvement within 60-90 days when they execute three changes in sequence. First, reducing charge-to-submission lag from 10 days to 4 takes 6 days off the metric directly. Second, working denials within 14 days of receipt instead of letting them age recovers more dollars from the 31-60 day bucket and prevents migration to 90+. Third, lifting clean claim rate from 90% to 95% removes 1.5-2.5 days through reduced rework cycles. A practice starting at 55 days can typically reach 42 within a quarter and 38 within two quarters. Reaching the MGMA top-quartile benchmark of 28-32 days requires sustained discipline on aged A/R cleanup and self-pay collection cadence — usually 6-9 months of work after the initial gains.
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