Why it matters in orthopedics
Days in A/R is the quickest read on cash flow, and orthopedic practices have several ways to distort it. Workers’ compensation claims follow state rules, personal-injury balances held under a letter of protection wait for a judgment or settlement, and Medicare DME claims go to a separate contractor. A practice-wide number can look fine while one payer class ages past 120 days.
How to calculate it
Pick one method and use it every month:
Gross days in A/R: gross A/R ÷ (gross charges for the period ÷ days in the period). MGMA and AAOE divide total A/R by a year of gross charges divided by 365. The AAFP suggests a 3-, 6- or 12-month period, with credits subtracted from charges.
Net days in A/R: net A/R ÷ average daily net revenue. HFMA’s MAP Key FM-1 uses net A/R (after credit balances and expected contractual and bad-debt allowances) and the daily average of net patient service revenue for the most recent three months.
Never divide net A/R by gross charges; the result looks excellent and means nothing. For example, $3,800,000 of gross A/R against $100,000 of average daily gross charges is 38 days.
Track aging too. HFMA’s MAP Key AR-1 ages billed A/R from the date of service into 0–30, 31–60, 61–90, 91–120 and over-120-day buckets. The share of A/R over 90 and over 120 days shows what the average hides, which is why the AAFP recommends watching the over-120 figure.
Orthopedic benchmark
We found no public orthopedic median. MGMA’s DataDive and the AAOE Benchmarking Survey report specialty data to subscribers and participants. The AAFP gives the clearest published rule of thumb: below 50 days at minimum, with 30 to 40 days preferable.
Direction matters as much as level. In a July 28, 2026 MGMA Stat poll (203 responses), 32% of practice leaders said days in A/R were higher than a year earlier, 43% about the same and 22% lower. Our orthopedic RCM benchmarks guide shows how this metric fits with the other core KPIs.
What moves it
Charge lag from open encounters, unsigned operative notes and late charge entry.
Front-end errors in eligibility, registration and authorization.
Denials and rework; claims stay in A/R until they are resolved, so a rising denial rate shows up here.
Payer mix, especially workers’ comp, personal injury and Medicare Advantage.
Patient balances after insurance pays.
Unposted adjustments and credit balances, which distort the A/R balance itself.
How to improve it
MGMA suggests four checks: run A/R aging by payer, expect clinicians to close encounters within 72 hours and staff to post charges within two days, work denials daily starting with high-dollar claims and the nearest appeal deadlines, and request patient-responsibility amounts before the patient leaves.
Report workers’ comp and personal-injury A/R separately, and watch filing limits; Medicare requires claims within one calendar year of the date of service. Pair this metric with your net collection rate, because collecting the wrong amount quickly is not a win.
Frequently asked questions
What is the difference between gross and net days in A/R?
Gross days divide gross A/R, at full charge, by average daily gross charges. Net days divide net A/R, after expected contractual adjustments and allowances, by average daily net revenue, which is how HFMA’s MAP Key FM-1 works. Both are valid if the numerator and denominator match. Gross days need no estimate of expected adjustments, while net days better reflect the cash you expect to collect.
Should personal-injury balances count in days in A/R?
Include them in your total, because they are real receivables, but also report days in A/R without them. Under a letter of protection, payment is promised from a future judgment or settlement, so those balances can age for months by design. Mixing them into one number can hide problems with commercial or Medicare claims, or make a stable personal-injury book look like a billing failure.
How often should a practice calculate days in A/R?
Monthly, using the same formula and period every time. HFMA’s net method uses a rolling three-month daily average of net revenue, which smooths the swings that surgical scheduling creates. Review the result alongside the aging report and the denial trend in the same meeting, and break it out by payer at least quarterly so slow payers surface before contract talks.
Guides that cover this term
Orthopedic RCM Benchmarks for 2026: Days in A/R, Clean Claim Rate, Denial Rate and Net Collection Rate
Sourced 2026 targets for orthopedic days in A/R, clean claim rate, denial rate and net collection rate, with formulas and a worked example.
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In-House vs. Outsourced vs. AI-Automated Billing for Orthopedic Practices (2026)
A neutral 2026 comparison of in-house, outsourced and AI-automated orthopedic billing: cost, control, compliance, fit by size and vendor questions.
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Related terms
Sources
HFMA MAP Keys — Healthcare Financial Management Association, accessed October 2026
Indicators of Revenue Cycle Excellence, 2023 Edition (MAP Keys definitions) — Healthcare Financial Management Association, October 2023
Practice Finances and Revenue Cycle Management — American Academy of Family Physicians, accessed October 2026
MGMA DataDive Definitions — Medical Group Management Association, May 2025
AAOE Benchmarking Results: Report Overview and Formulas — AAOE, January 2024
Days in A/R holds steady for most practices, but payer pressure persists in 2026 — MGMA Stat, July 30, 2026
42 CFR 424.44, Time limits for filing claims — Electronic Code of Federal Regulations, current as of October 2026
Florida Statutes 768.0427, Admissibility of evidence to prove medical expenses in personal injury or wrongful death actions; disclosure of letters of protection; recovery of past and future medical expenses damages — Florida Legislature, 2025 Florida Statutes
This entry is educational and is not legal, coding-compliance or billing advice. Payer rules change often, so confirm requirements with the payer before you bill. CPT® is a registered trademark of the American Medical Association; code descriptions here are Rette’s plain-language summaries.