Most OB-GYN practice managers who print an aging accounts receivable report for the first time have the same reaction: the over-90 bucket looks like a disaster. A quarter or more of the total AR appears to be aging past ninety days, the blended days-in-AR reads somewhere in the mid-fifties, and every instinct built from reading other specialties' reports says the billing is falling apart. Then a seasoned biller looks at the same report and shrugs. The difference is not optimism. It is that OB-GYN AR is structurally distorted by the way maternity care gets billed, and until you correct for that distortion you cannot tell the difference between a healthy report and a real crisis.
This is the trap of aging accounts receivable at a medical practice that runs a heavy obstetric caseload. The standard benchmarks everyone quotes, days-in-AR under 40 and an over-90 bucket under 15 percent, were built for practices that bill something every time a patient walks in. OB-GYN does not work that way, because the single largest revenue event in the practice, the delivery, is billed as one global package covering nine months of care. Read the report as if it were a family medicine practice and you will either panic over normal aging or, worse, feel reassured by a blended number that is quietly hiding a stalled gyn backlog underneath the maternity cycle. This piece walks through how to read the report correctly and when to actually worry.
Why the Global Maternity Package Bends Every Aging Bucket
The heart of the problem is the global obstetric package. Codes like 59400 for routine vaginal delivery with antepartum and postpartum care, 59510 for cesarean, 59610 for VBAC, and 59618 for cesarean after attempted VBAC each bundle roughly thirteen antepartum visits, the delivery itself, and postpartum care into one charge. Your practice provides that care across eight or nine months, but you cannot drop the claim until after the delivery. That means the entire first and second trimester of work produces no billable charge at all, and then a large charge, often three to five thousand dollars, posts all at once near the end of the episode.
Now think about what that does to an aging report. The report ages a charge from the date it hits AR. But the care that charge represents began months earlier. Even a perfectly clean global claim that is paid promptly after delivery will represent care that is, in a real-world sense, extremely "old," and if there is any hiccup, a coordination-of-benefits question, an eligibility mismatch because the patient changed plans mid-pregnancy, or a delayed postpartum visit that holds the package open, the global charge sits in the 60-plus and 90-plus buckets while it resolves. This is not a biller falling behind. It is the calendar of pregnancy expressed as an aging curve.
flowchart LR A[First prenatal visit] --> B[Antepartum care<br/>13 visits] B --> C[Delivery event] C --> D[Global charge<br/>drops to AR] D --> E[Postpartum care<br/>closes episode] E --> F[Payer adjudicates] F --> G[Payment posts<br/>day 55 blended] B -.no billable charge.-> H[Silent AR months 1-8] H -.inflates over-90 bucket.-> D
The practical consequence is that a blended days-in-AR of 50 to 58 is genuinely normal for an OB-GYN practice with a healthy obstetric volume, whereas the same number at a dermatology or ENT office would be a red flag. If you benchmark your practice against generic medical-practice AR targets, you will spend energy chasing a problem that is really just the shape of your business.
Splitting the Report Into Maternity-Global and Everything Else
The single most useful thing you can do before reading an OB-GYN aging report is to split it in two. Build one view that isolates the global maternity codes, 59400, 59409, 59410, 59510, 59514, 59515, 59610, 59612, 59614, 59618, and the antepartum-only and postpartum-only codes such as 59425, 59426, and 59430, and a second view for everything else. That second view is your true gyn business: well-woman exams, colposcopies, IUD and Nexplanon insertions and removals, endometrial biopsies, ultrasounds, problem visits, and surgical procedures.
Once the report is split, the two halves get judged by completely different rules. The gyn side should behave like any normal specialty. Days-in-AR under 40, the over-90 bucket under 15 percent of that segment, and denials worked within a week. There is no structural reason a well-woman exam or an IUD insertion should age, so if that side of the report is bloated, you have a genuine billing problem hiding in plain sight.
The maternity-global side gets measured on a different clock. Do not age a global from the first prenatal visit; age it from the delivery date, because that is when the billable event actually occurs. Measured that way, a global claim should be dropped within a few days of delivery and paid within your payer's normal cycle, so a delivered global that is still unbilled or unpaid 45 days after the delivery date is the thing that should get your attention, not the fact that the episode as a whole spanned nine months.
Reading the Non-Maternity Gyn Bucket Like Any Specialty
Here is where a lot of OB-GYN practices get quietly hurt. Because everyone expects OB AR to look old, the gyn backlog gets camouflaged. A biller who is behind on colposcopy denials or unposted surgical payments can point at the scary blended over-90 number and say "that's just the OB globals," and if nobody has split the report, the explanation holds. Months later the practice discovers that thirty or forty thousand dollars in perfectly collectible gyn claims aged past timely-filing while everyone assumed it was maternity.
So work the gyn view aggressively. The denial patterns on the gyn side have their own fingerprint. Preventive well-woman visits denied because a problem-oriented code and a preventive code were billed together without the right modifier. IUD and implant claims where the device J-code, such as J7297 or J7298 for the levonorgestrel systems, or J7307 for the implant, was billed without the insertion code or without documenting the exact units. Colposcopy and biopsy claims denied for medical necessity when the diagnosis code did not support the procedure. Screening versus diagnostic confusion on Pap and HPV testing. These are recurring, addressable denials, and when they stack up unworked, that gyn over-90 bucket grows for reasons that have nothing to do with pregnancy.
The discipline that keeps this segment clean is old-fashioned: clean claim within 48 hours of the visit, denials touched within a week, payments posted the day they arrive, and a weekly look at the gyn-only days-in-AR trend. If that number is climbing week over week, your practice has a real problem regardless of how the OB side looks. This is exactly the kind of denial management for a small practice that gets neglected when one or two billers are also trying to babysit the slow global cycle.
The Three OB-GYN Warning Signs That Actually Matter
Once the report is split, three specific signals tell you whether to worry, and none of them is "the over-90 bucket is big."
First, a growing over-120 bucket on non-global claims. Aging past 120 days on a gyn claim means it has already blown through most commercial timely-filing appeal windows and is drifting toward permanent write-off. A little over-90 on the gyn side happens; a swelling over-120 bucket is money you are about to lose.
Second, repeating denials on the same CPT families with no evidence anyone is working them. If you see the same modifier-25 preventive denials, the same IUD J-code rejections, or the same medical-necessity bounces month after month, the problem is not the individual claim, it is that nobody has fixed the root cause and nobody is resubmitting. A denial rate above 10 percent on the gyn side, with the same reasons recurring, is a backlog announcing itself.
Third, and most specific to OB-GYN, delivered globals that were never dropped. This is the silent killer. A patient delivers, the episode should close, the global should bill, but the encounter never got finalized, the postpartum visit is holding it open past the point it should, or the charge is stuck in a work queue. Because the practice expects OB claims to age, an undropped global can sit invisible for months. Run a monthly reconciliation of deliveries against dropped global charges; every delivery on the L&D log should have a matching billed global within a couple of weeks, and any gap is real money sitting still.
flowchart TD
A[OB-GYN aging report] --> B{Split by segment}
B --> C[Maternity global view]
B --> D[Gyn everything else view]
C --> E{Delivered global<br/>unbilled past 45 days}
E -->|Yes| W[Worry - close episode]
E -->|No| OK1[Normal cycle]
D --> F{Over-120 growing<br/>or denials repeating}
F -->|Yes| W
F -->|No| OK2[Healthy gyn AR]
W --> G[Rescrub - resubmit - follow up]
G --> H[Days in AR falls]How Automated Billing Keeps the Global Cycle From Hiding a Backlog
The reason these problems fester in small and mid-size OB-GYN practices is almost always staffing. One or two billers are carrying the entire revenue cycle, and the maternity globals demand a kind of long-horizon attention, tracking episodes across months, that competes directly with the day-to-day work of scrubbing gyn claims and chasing denials. When the biller is out sick, quits, or simply runs out of hours, the slow OB cycle provides perfect cover for a growing gyn backlog, and nobody notices until the cash gap arrives.
This is where automating the mechanical parts of the revenue cycle changes the math. CallSphere Health's billing and claims workflow scrubs every claim before submission against payer-specific edits, so the recurring OB-GYN denial patterns, the modifier-25 preventive collisions, the IUD J-code and unit errors, the screening-versus-diagnostic Pap mismatches, get caught before they ever become an aged claim. Denials that do come back are worked automatically with same-week resubmission instead of sitting in a queue waiting for a human who is already underwater. And because the system tracks each obstetric episode from delivery date rather than from the first prenatal visit, a delivered global that has not dropped surfaces as an exception the week it happens, not the quarter after.
Just as importantly, the reporting stays split by design, so the maternity cycle and the gyn cycle each get measured against the right benchmark and neither can hide behind the other. The practice manager sees a true gyn days-in-AR and a true maternity cycle time, side by side, without exporting to a spreadsheet at midnight. For a practice weighing whether to add a billing seat it cannot reliably staff or hand the mechanical work to a system, the pricing math usually favors automation well before the second full-time biller, especially once you count the recovered timely-filing write-offs the old blended report was hiding.
What to Do Monday Morning
You do not need new software to start reading your report correctly. Pull your aging accounts receivable, filter the global maternity CPT codes into their own view, and look at the two halves separately. Age the globals from delivery date and flag any delivered episode that has not billed within 45 days. On the gyn side, sort the over-120 bucket and the recurring denial reasons, and pick the biggest repeating pattern to fix at the root this week.
If the gyn side is clean and only the maternity cycle looks old, breathe: that is the shape of OB-GYN, not a crisis. If the gyn over-120 bucket is growing or the same denials keep coming back untouched, that is your signal that the revenue cycle is behind and the slow global cycle has been covering for it. Either way, the report only tells the truth once you stop reading OB-GYN AR as if it were any other specialty, and start measuring the two clocks that actually run your practice.