The short answer
Accounts receivable days is an operational estimate of how much receivable balance exists relative to a chosen daily revenue or charge denominator. The formula, balance scope, adjustment treatment, patient responsibility, date basis, and lookback window must be defined consistently; otherwise comparisons are misleading. There is no universal healthy number. Review the trend with aging, payer, service, denial, underpayment, and cash-collection data before choosing a corrective action.
What are accounts receivable days?
Accounts receivable (AR) days — sometimes called days in AR or days sales outstanding — measure the average time it takes a treatment center to collect payment after a claim is billed. The formula is straightforward:
AR Days = Total Accounts Receivable ÷ Average Daily Charges
The denominator may use billed charges or a net-revenue measure over a defined trailing window. Those choices can materially change the result, especially when contractual adjustments or payer mix shift. Document the calculation and use the same definition across periods and sites.
AR days is not cash flow, collectability, or profitability by itself. Review it alongside cash collections, aging, expected reimbursement, contractual adjustments, credit balances, patient responsibility, denial status, and operating costs.
Why behavioral health organizations examine the components
Depending on the organization's services and contracts, the calculation may be influenced by factors such as:
- Authorization requirements. Some services require initial or continuing authorization, and a level-of-care change may change the terms.
- Medical-necessity review. Some payers request clinical evidence under plan-specific criteria in addition to claim codes and other conditions.
- Payer mix is often mixed and complex. Many programs bill a combination of commercial payers, Medicaid, and self-pay, each with different timelines, portals, and documentation standards.
- Credentialing delays ripple downstream. A clinician who isn't fully credentialed with a payer can hold up an entire batch of claims tied to their sessions.
None of this means AR days will always run high — it means the practices that keep it in check have to be deliberate, not incidental.
What's a healthy AR days number?
There is no single benchmark that applies across every program, payer mix, and level of care, and treatment centers should be cautious of any number presented as a universal target. What matters more is:
- Trend over time. Is AR days rising quarter over quarter, or holding steady?
- Aging distribution. What share of AR is current (0–30 days) versus aging past 90 or 120 days? A growing tail of old AR is a stronger warning sign than the headline average.
- Payer-by-payer variance. Averages can hide a specific payer or claim type that is dragging the whole number up.
Tracking the trend and the aging buckets — rather than chasing a single external number — gives leadership a more actionable view of collections health.
The levers that move AR days
AR days is a lagging indicator influenced by upstream and downstream revenue-cycle work. When the number moves, examine three areas first:
| Lever | What it addresses | Typical failure mode without it |
|---|---|---|
| Clean-claim submission | Getting claims accepted and adjudicated on the first pass | Missing authorization numbers, coding mismatches, eligibility not verified at time of service |
| Denial management | Reworking and appealing denied claims promptly | Denials sit unworked past timely-filing or appeal deadlines |
| Follow-up cadence | Systematic outreach on unpaid claims before they age out | Claims fall through the cracks once submitted, with no scheduled recheck |
| Enrollment and credentialing upkeep | Tracking payer-specific effective dates and requirements for billed services | A status or effective-date problem may affect a group of claims |
| Eligibility and VOB accuracy | Confirming coverage and benefit levels before or at admission | Claims billed against inaccurate coverage assumptions get denied downstream |
Validate claims before submission
Pre-submission checks can reduce selected avoidable errors, but the required checks depend on the payer, service, provider, and contract. Eligibility, authorization, coding, documentation, and claim acceptance also do not guarantee payment.
Denial management as a discipline, not a fire drill
Use actual remittance and denial data to decide whether denial follow-up is a material AR driver. Categorize reason codes, validate root causes, route ownership, and follow the payer's corrected-claim or appeal instructions and deadlines.
A follow-up cadence that doesn't rely on memory
Unresolved claims can contribute to aging AR. Use payer-specific status, timely-filing, reconsideration, and appeal rules to define work queues; record the source and current deadline rather than relying on a universal follow-up cadence or age threshold. Analyze actual disposition data before labeling an item preventable or unrecoverable.
Where AR days meets your RCM workflow
AR days reflects a chain of eligibility, authorization, claim, remittance, denial, follow-up, and collection activity—not a number to manage in isolation. Sunwave's current revenue cycle management page describes eligibility and VOB, claims status, error detection, remittance matching, utilization-review management, and financial dashboards. Ask the team to demonstrate the exact data sources, calculation, aging logic, automation, exceptions, and implementation scope, then validate performance against your own baseline.
Frequently asked questions
What is a good accounts receivable days number for a behavioral health program?
There is no single benchmark that fits every program. First define the calculation, date basis, denominator, payer segments, credits, self-pay, and exclusions. Then compare the organization's own trend and aging distribution with claim status, denial, appeal, payment, adjustment, and data-quality detail rather than treating one threshold as universally good or bad.
How do you calculate AR days?
A common approach divides a defined AR balance by average daily charges or net revenue over a documented trailing period. Different denominators and adjustment policies produce different results, so record the exact formula and avoid comparing unlike calculations.
What causes AR days to increase at a treatment center?
Common drivers include claims submitted with errors or missing authorizations, slow or inconsistent follow-up on unpaid claims, denials that are never reworked, and payer-side delays tied to verification of benefits or level-of-care documentation.
Does AR days include self-pay balances?
Programs vary in how they track this. Many track insurance AR and self-pay/patient-responsibility AR separately, since the collection dynamics — and the levers that improve each — are different.
Sources
This article is educational and describes software capabilities and general industry practices; it is not legal, clinical, financial, or billing advice. Requirements vary by organization, payer, program, and jurisdiction. Sunwave Health is a behavioral health software platform. Schedule a demo.
