Days in Accounts Receivable

Days in Accounts Receivable and Provider Liquidity

Days in accounts receivable, often shortened to AR days or DAR, expresses the money a health care provider is owed by payers and patients as a number of days of revenue, so that a large hospital and a small clinic can be compared on one scale. It sits where hospital finance meets provider payment design. When a provider is paid claim by claim, every episode of care becomes a receivable that has to be coded, billed, adjudicated and collected, and the delay ties up cash. The standard formula is the one defined by the Healthcare Financial Management Association (HFMA), and the figure means little for providers funded by block or capitated payments, such as NHS trusts in England.

The formula as a balance-sheet stock over a daily revenue flow

The measure divides a stock by a flow. The numerator is the receivables balance on a given date, taken from the balance sheet. The denominator is the average revenue earned per day over a recent period, taken from the income statement.

$$DAR = \frac{AR}{R / D}$$

where $DAR$ is days in accounts receivable, $AR$ is the patient receivables balance at the end of the period, $R$ is net patient service revenue earned over the period and $D$ is the number of days in that period, so that $R / D$ is average daily net revenue. The result reads as the number of days of revenue that are billed or earned but not yet collected.

The HFMA standard version is its MAP Key FM-1, net days in accounts receivable. It uses the net patient receivable on the balance sheet as the numerator and, as the denominator, a daily average of net patient service revenue over the most recent three months, counting the actual calendar days, so a quarter ending 30 June uses 91 days. HFMA defines net patient service revenue as gross patient service revenue minus contractual allowances, minus the charity care provision, then minus the provision for doubtful accounts. Its guidance also illustrates the change brought by the revenue recognition standard ASC 606, under which the amount a hospital does not expect to collect from patients is recorded as an implicit price concession that reduces revenue, rather than as a separate provision for bad debt.

Gross and net receivables

Hospitals in the United States bill at list charges that most insurers do not pay in full, so the choice between gross and net figures matters more than in most industries. Gross receivables are outstanding balances valued at full charges. Net receivables are the amounts the provider expects to collect, after deductions for contractual allowances agreed with third-party payers, discounts for charity care and allowances for accounts expected to be uncollectible. HFMA's net receivable also nets off credit balances, which arise when a payer or patient has paid more than is owed.

Net days are the usual liquidity measure because both numerator and denominator are stated in expected cash. Charges are far from costs, as the cost-to-charge ratio makes clear, so a gross figure weights each payer by its list charges rather than by the cash or resources involved. The rule in practice is consistency, meaning gross receivables over gross revenue, or net over net, and never one mixed with the other.

What lengthens collection time in health care

A receivable passes through several stages before it becomes cash, and delay at any stage adds days. The account is registered and the care is coded, a claim is produced and submitted, the payer adjudicates it and pays, denies or partly pays it, and any balance left to the patient is billed and pursued. HFMA's MAP Keys, a set of 29 revenue cycle indicators, follow this sequence with groups for patient access, pre-billing, claims, account resolution and financial management, so a long figure can be traced to the stage that caused it.

Payer mix

Different payers pay at different speeds. The overall figure is a revenue-weighted average of the payer-specific figures. Splitting receivables and daily revenue by payer group shows this.

$$DAR = \frac{\sum_j AR_j}{\sum_j r_j} = \sum_j w_j \, DAR_j$$

where $AR_j$ is the receivables balance owed by payer group $j$, $r_j$ is average daily net revenue from that group, $DAR_j = AR_j / r_j$ is the group's own days figure and $w_j = r_j / \sum_k r_k$ is its share of daily revenue. A shift in payer mix towards slower payers therefore raises the overall figure even when no payer changes its behaviour and the billing office performs exactly as before.

Claim denials and coding and billing lags

A denied claim returns to the start of the cycle, where it has to be corrected, resubmitted or appealed, and the receivable ages in the meantime. HFMA tracks this with a remittance denial rate, the share of remitted claims that carry a denial, counting only denials that the provider can address and correct, and leaving out denials for services the plan does not cover. Lags before a claim is ever sent, such as incomplete clinical documentation, coding backlogs and claims held for edits, add days in the same way.

Prompt-payment rules

Public payers in the United States work within payment windows set in law, and for Medicare the statute fixes both a floor and a ceiling on how fast clean claims are paid. A clean claim is one with no defect or special circumstance that prevents timely payment. For Medicare Parts A and B, contractors must pay at least 95 per cent of clean claims within 30 calendar days of receipt, and must not pay any claim within 13 days of receipt if it was submitted electronically, or within 28 days otherwise. Interest is owed on clean claims paid late, at the rate used for federal prompt-payment penalties. Receivables from Medicare can therefore only shrink so far, and much of the scope for improvement lies in the share of claims that are not clean.

Where the measure sits among hospital financial ratios

Days in accounts receivable is usually read alongside liquidity measures such as days cash on hand and the current ratio, two of the liquidity ratios drawn from a provider's accounts. The current ratio divides current assets by current liabilities, and days cash on hand divides cash and short-term investments by average daily cash operating expenses, usually operating expenses less depreciation divided by 365, giving the number of days the provider could keep operating with no further income.

The three measures respond differently to slower collection, which is why they are read together. When payers take longer to pay, value moves from cash into receivables. Days cash on hand falls and days in accounts receivable rises, but as long as the gap is met from cash the current ratio does not move at all, because cash and receivables are both current assets; the related quick ratio is unaffected for the same reason. If the gap is instead financed by short-term borrowing or slower payment of suppliers, current liabilities rise and the current ratio falls.

The economics of cash tied up in receivables

A receivable is an interest-free loan from the provider to the payer or patient for as long as the bill stays unpaid. The money has to be financed in the meantime, from cash reserves, borrowing or slower payment of suppliers. The cost of carrying receivables is therefore an opportunity cost, set by the return those funds could otherwise earn.

$$C = i \times \bar{r} \times DAR$$

where $C$ is the annual cost of carrying the receivables balance, $i$ is the provider's annual cost of capital or the rate of return on the best alternative use of the funds, $\bar{r}$ is average daily net revenue and $DAR$ is days in accounts receivable, so that $\bar{r} \times DAR$ is the receivables balance. The cost rises with interest rates, which links the measure to the time value of money.

From a health-system perspective, much of this cost is a transfer, since a payer that delays payment gains the use of the money and the provider loses it, and statutory interest on late claims shifts part of that cost back. The resource cost lies in the administrative effort spent producing, correcting and chasing claims, and in any care cut or delayed because a provider short of working capital cannot pay staff or suppliers on time. A lengthening collection period can create a cash shortfall even while the income statement shows a surplus, since revenue is recognised when care is delivered and cash arrives later.

How payment systems change what the measure means

The measure is built for providers paid per claim. Under fee-for-service payment, and under case-based payment per admission, every episode creates a receivable whose size and age depend on the revenue cycle, so the measure tracks how quickly delivered care turns into cash. Under capitation, the provider is paid a fixed amount per enrolled person for a period, usually without a claim for each service, and receivables have little to do with activity. HFMA's own definition reflects this, and capitation and premium revenue related to value-based or risk-based payer contracts are excluded from both the receivables and the revenue used in its calculation.

NHS trusts in England are the clearest case where the measure means little for the main income stream. Under the 2026/27 NHS Payment Scheme, almost all commissioner relationships with NHS providers worth more than £1.5 million a year follow the aligned payment and incentive rules, under which the two sides agree in advance a fixed element for secondary care, based on a forward-looking assessment of activity and an agreed plan. Smaller relationships are normally paid through a low volume activity block payment. The NHS Standard Contract requires each commissioner to pay an NHS trust or foundation trust, on the fifteenth day of each month, one twelfth of the agreed expected annual contract value, unless another day or proportion is agreed. These payments on account do not wait for claims, so a trust's receivables from its main commissioners reflect contract timing and in-year adjustments rather than the speed of coding and billing, and comparison with US hospitals paid claim by claim is not meaningful.

Worked example with one hospital quarter and three payer groups

The figures below are illustrative. A hospital paid mainly per claim reports for the quarter April to June, which has 91 days, net patient service revenue of USD 91.0 million and net patient receivables of USD 55.0 million at 30 June. Its receivables and revenue split across three payer groups as follows.

1. Daily revenue and net days. Dividing the quarter's revenue by its 91 days, then the receivables balance by the result, gives the measure.

$$\bar{r} = \frac{91.0}{91} = 1.0, \qquad DAR = \frac{55.0}{1.0} = 55.0$$

where $\bar{r}$ is average daily net patient service revenue in USD millions and $DAR$ is net days in accounts receivable. The hospital holds 55 days of net revenue as receivables.

2. The same figure as a payer-weighted average. Each group's days figure is weighted by its share of revenue.

$$DAR = 0.5 \times 35 + 0.3 \times 60 + 0.2 \times 97.5 = 55.0$$

where the weights are the revenue shares and the multipliers are the group days from the table. Patient balances bring 20% of revenue but account for 19.5 of the 55.0 million in receivables.

3. A change in payer mix alone. If total daily revenue stays at USD 1.0 million but the public payer's share falls to 40% and the patient share rises to 30%, with every group collecting exactly as fast as before, the figure rises.

$$DAR' = 0.4 \times 35 + 0.3 \times 60 + 0.3 \times 97.5 = 61.25$$

where $DAR'$ is the overall figure after the change in mix. The hospital appears to have lost more than six days of collection performance, although no part of its billing process has changed.

4. The value of shorter collection. If better coding and fewer denials bring net days back from 55 to 45 at the same revenue, the receivables balance falls by USD 10.0 million.

$$\Delta AR = 1.0 \times (55 - 45) = 10.0$$

where $\Delta AR$ is the reduction in receivables in USD millions. The released cash can be used in one of two ways, and the gains below are alternatives, not additions. If it repays borrowing or is invested at an illustrative 6% a year, the annual saving in carrying cost is as follows.

$$\Delta C = 0.06 \times 10.0 = 0.6$$

where $\Delta C$ is the annual saving in USD millions, or USD 600,000 a year. If instead it is held as cash or short-term investments, and the hospital's cash operating expenses are USD 0.95 million a day, it adds to days cash on hand.

$$\Delta DCOH = \frac{10.0}{0.95} \approx 10.5$$

where $\Delta DCOH$ is the increase in days cash on hand. In that case the current ratio is unchanged, because USD 10.0 million has moved from receivables to cash within current assets.

Limits and common errors in reading the figure

The measure is easy to misread. Its numerator is a single date and its denominator a trailing average, so revenue growth inflates it. When activity is rising, the three-month average understates current daily revenue and the ratio overstates the true collection period, and falling activity has the opposite effect. HFMA describes its measure as a trending indicator, to be followed over time rather than read as a single score.

Net days can also fall without any cash being collected. Raising the allowance for uncollectible accounts, or netting growing credit balances against debit balances, shrinks net receivables; writing balances off reduces gross receivables, and net receivables only where the balance had not already been provided for. HFMA tracks net days in credit balance as a separate measure, and its AR-1 measure groups billed receivables by ageing category (0 to more than 120 days), which shows whether a fall in the average came from collecting old accounts or from removing them.

The measure describes the timing of cash, not the quality of care or the efficiency with which care is produced, so it is distinct from productivity measures such as bed turnover and from quality indicators. Comparisons across providers are valid only when they share a payment system, the same definitions of numerator and denominator, and a similar payer mix.

Sources

• Healthcare Financial Management Association. HFMA MAP Keys: industry-standard revenue cycle KPIs (FM-1 net days in accounts receivable; AR-1 aged A/R as a percentage of total billed A/R; AR-5 remittance denial rate; AR-9 net days in credit balance). HFMA; accessed 2 October 2026. https://www.hfma.org/topics/hfm/2022/map-keys/
• NHS England. 2026/27 NHS Payment Scheme: August 2026 update (PRN02348). London: NHS England; 2026. Section 1 (Table 1) and Section 4 (paragraph 81, rule 2).
• NHS England. 2026/27 NHS Standard Contract: Service Conditions (Full Length) (PRN02123). Version 1. London: NHS England; November 2025. SC36.12 to SC36.13.
• Reiter KL, Song PH. Gapenski's Healthcare Finance: An Introduction to Accounting and Financial Management. 7th ed. Chicago: Health Administration Press; 2020.
• United States Code. Title 42, section 1395h(c), prompt payment of claims under Medicare Part A (Social Security Act section 1816(c)), and section 1395u(c), prompt payment of claims under Medicare Part B (Social Security Act section 1842(c)). Text as current in 2026.