What Did OBGYN Underpayments Cost California Practices in the First Half of 2026?

California OBGYN practices lose 2 to 5 percent of collected revenue to underpayments that post as paid, not denied. The main causes are global maternity repricing, outdated fee schedules, modifier edits, and Medi-Cal plan reassignment. Recovery depends on filing the right dispute before payer-specific deadlines: Medi-Cal PDR (365 days), AB 72 (PDR plus 45 working days), and Medicare (120 days).

Key Takeaways

• California OBGYN groups lose 2 to 5 percent of collected revenue to underpayments that post as paid.
• Most underpayments come from global maternity repricing, old fee schedules, modifier edits, and plan changes.
• Check 25 to 50 paid claims per top payer against your contract to find the gaps.
• Each payer has its own dispute deadline: 365 days for Medi-Cal, 120 days for Medicare.
• AB 3275 requires plans to pay within 30 days or add 15 percent interest.
• Multi-site groups need payer-by-payer tracking, because blended reports hide the losses.

OBGYN underpayments cost California practices between 2 and 5 percent of collected revenue in the first half of 2026. That figure applies to groups collecting $1 million or more per month. Medi-Cal managed care variance and AB 72 out-of-network gaps drive more of that total than in most other states.

That range sits above the national figure for one structural reason. Specifically, California runs the most fragmented managed care landscape in the country. The same global maternity claim can process correctly at Health Net. It can then get repriced without explanation at Molina Healthcare or Anthem Blue Cross. However, neither event triggers a denial code a billing team would normally chase.

What OBGYN Underpayments Cost California Practices Actually Means

OBGYN underpayments cost California practices the gap between what a payer contractually owes on a claim and what it actually remitted. The payer may be Medi-Cal managed care, a commercial carrier, or Medicare. Kaiser, Anthem Blue Cross, Health Net, Molina Healthcare, IEHP, and L.A. Care each run distinct configurations across California’s counties. As a result, the same CPT and modifier combination can pay differently depending on which plan processed it.

DHCS expanded Medi-Cal managed care enrollment statewide earlier in 2026 and reassigned patients between these plans. The timely filing clocks moved with them, and most practices do not track those clocks at the patient level. A claim filed against an outdated plan assignment often pays at a reduced rate instead of triggering a claim denial.

Underpayment vs. Denial vs. Payment Variance

Billing teams use these three terms as if they mean the same thing. They don’t, and mixing them up sends recoverable dollars to the wrong work queue.

A payment variance is any gap between expected and actual payment. That gap can come from underpayments, overpayments, or contractual adjustments. A variance only becomes an underpayment once someone confirms that the contract or the statute supports the higher amount. A variance review flags the accounts where the math doesn’t match, but it does not decide whether a discrepancy is recoverable.

Industry estimates put underpaid claims at 3 to 11 percent of all insurance claims. For a California OBGYN group, nearly all of that volume sits in the bottom two rows.

The Pain Points California OBGYN Practices Face With Underpayments

Underpayments rarely announce themselves. The claim shows as paid, the balance closes, and the shortfall never reaches a work queue. For California OBGYN practices, that creates problems that feel unrelated until you trace them to the same source.

• Collections drift below production. Delivery volume and visit counts hold steady, yet net collections slip a little each quarter. Still, no single denial report explains why.
• Global maternity payments that do not match the contract. The package covers months of antepartum care, the delivery, and postpartum visits, yet it arrives as one payment. As a result, a repriced or partially paid global claim is hard to spot at posting.
• Staff time lost to manual checking. Comparing remittance against six plan fee schedules by hand is slow work. As a result, most teams only check the claims that deny.
• Deadlines that expire quietly. Each payer type runs its own dispute clock, and a missed window converts a recoverable variance into a permanent write-off.
• Aging balances nobody owns. Short-paid claims that do get flagged tend to sit in Legacy AR behind newer work until they age past recovery.
• Late payments with no interest attached. Since January 1, 2026, AB 3275 requires California health plans to pay a complete claim within 30 calendar days. In addition, late payments must include interest at 15 percent per year. Still, few practices audit whether the plan actually paid that interest.

Nationally, 41 percent of providers say payers deny their claims at least 10 percent of the time. That figure comes from Experian Health’s 2025 State of Claims survey. Denials at least get worked. In contrast, an underpaid claim carries the same revenue risk with none of the visibility.

What Causes OBGYN Underpayments in California

OBGYN underpayments cost California practices money through a small number of repeatable causes. Knowing which one produced a given variance decides which document gets filed and where it goes.

Payment and Coding Causes

• Global maternity package repricing. Global codes such as CPT 59400, 59510, and 59610 bundle antepartum care, delivery, and postpartum care into one payment. A patient may change plans mid-pregnancy, or a plan may split the package on its own logic. The pieces then often add up to less than the contracted global rate.
• Outdated fee schedules in the payer’s system. A renegotiated rate that the plan never loaded pays every claim at last year’s amount. Each one still posts as paid in full.
• Modifier and bundling edits. Payer edits often target modifier 25 on a separately identifiable evaluation visit and modifier 22 on an unusually complicated delivery. Multiple-procedure reductions on gynecologic surgery are another common target. Each edit can cut payment without issuing a denial.

Plan, Network, and Enrollment Causes

• Plan reassignment and eligibility mismatches. The state may move a Medi-Cal member between managed care plans. A claim sent under the old assignment can then pay at a reduced rate. It can also stall until the timely filing window has narrowed.
• Out-of-network default rates under AB 72. AB 72 covers non-emergency services by a noncontracted provider at an in-network facility. It sets payment at the greater of the plan’s average contracted rate or 125 percent of the Medicare rate. Plans calculate that figure themselves, and it stands unless the practice disputes it.
• Capitation and carve-out confusion. Some services belong outside an IPA capitation arrangement and should pay fee-for-service. Instead, the IPA sometimes absorbs them into the capitated payment and never reimburses them separately.
• Credentialing gaps. A newly added physician may not be fully enrolled with every plan. Those plans can pay a default or out-of-network rate for weeks before anyone notices.

None of these causes generates a rejection. Each produces a payment that looks routine, which is why they persist for months across hundreds of claims.

How to Calculate What Underpayments Cost Your California Group

To see what OBGYN underpayments cost your California group, start with your top three payers by volume. Pull the contracted fee schedule for each one. That usually means two Medi-Cal managed care plans plus your leading commercial carrier. Then compare each schedule against actual remittance on 25 to 50 claims per payer from January through June.

Escalate to a full remittance review if more than 8 percent of sampled claims show variance. Do the same if any single variance exceeds 5 percent of the allowed amount. The sample tells you where variance concentrates. However, it does not tell you whether the recovery window on those claims is still open. Medi-Cal, AB 72, and Medicare each run separate clocks that start the moment the claim posts.

First Half 2026 Underpayment Cost Formula

Here is an illustration. A group billed 4,000 claims to one payer in the first half. Its sample showed variance on 8 percent of claims, averaging $62 short per affected claim. The math is 4,000 x 0.08 x $62, or $19,840, from that single payer. Run the same calculation for each top payer to see what OBGYN underpayments cost your California practice overall. These numbers are an example only. Your own sample supplies the real inputs.

Step-by-Step: How to Calculate Your Underpayment Cost

How to Prioritize Which Underpayments to Recover First

No internal team can chase every short-paid line. Recovery capacity is limited even in well-run clinics, so underpayments need to be ranked by the size of the shortfall and the likelihood of recovery.

For California OBGYN groups, rank in this order:

1. Deadline proximity. Medicare claims nearing day 120 come before Medi-Cal claims at day 90.
2. Systemic patterns. One fee schedule error repeating across 300 claims beats one large one-off variance.
3. Dollar value per line. Global maternity codes 59400, 59510, and 59610 carry the highest per-claim exposure.
4. Evidence strength. Claims with a clear contract clause or a DHCS fee schedule line win faster.

Zero-balance accounts belong on this list. A claim that closed at an incorrect allowed amount still holds recoverable revenue. Most practice management systems simply stop showing it once the balance reads zero.

What California Law Requires Health Plans to Pay

California gives OBGYN groups stronger leverage than most states, but only if the practice knows which rules it can enforce.

• Unfair payment pattern. Under DMHC rules, a plan that fails to pay at least 95 percent of complete claims correctly, including interest and penalties, over any three-month period is engaging in an unfair payment pattern.
• Mandatory PDR process. Plans must acknowledge each provider dispute within two working days of receiving an electronic dispute, and within 15 working days for a paper dispute.
• Enforcement is real. DMHC fined Molina Healthcare of California $1 million for failing to promptly pay $80.3 million to providers. Separately, Anthem Blue Cross reached a $3.2 million settlement over underpaid interest on late provider claims.

California OBGYN Underpayment Recovery Checklist by Payer Type

CMS official Medicare billing and claims-processing resources for physicians and suppliers are available here: CMS Medicare Billing and EDI Resources .

What to Include in a California Underpayment Dispute Package

Most PDRs fail because they are incomplete, not because they are wrong. A strong dispute package mirrors what top recovery teams send. That means the contracted rate, the actual payment, the dollar variance, the specific contract section governing reimbursement, and supporting documentation.

For California OBGYN disputes, add:

• The plan’s PDR form, with the claim number, member ID, and date of service
• The DHCS fee schedule line for Medi-Cal, or the AB 72 rate calculation for out-of-network disputes
• The ERA/835 remittance line showing the CARC and RARC codes applied
• For global maternity splits, the antepartum visit log and the dates of plan eligibility
• An AB 3275 interest calculation when the payment arrived after 30 calendar days

Batch disputes by root cause wherever the plan allows it. Fifty claims sharing one fee schedule error belong in one argument, not fifty separate filings.

Why Finding the Variance Is Only Half the Work

Running the sample above tells a practice where the problem lives. Recovering the money means filing the correct document with the correct department. Meanwhile, the deadline is already running by the time you identify the claim. A Health Net Medi-Cal underpayment and an IEHP underpayment on the same CPT code use different PDR mailboxes. An AB 72 dispute cannot go to DMHC until the payor’s own 45-working-day PDR window has run its course. Practices that find the variance but miss the sequencing lose the recovery anyway. They just lose it later, with more staff hours spent.

Why This Requires More Than a Denial Management Process

A strong denial management workflow catches claims rejected outright, not claims paid below the contracted or statutory rate. Finding these underpayments means comparing remittance against plan-specific fee schedules on claims already closed. That is a different discipline than working a claim denial queue built for rejection codes.

Generalist Medical Billing Services rarely track each plan’s configuration closely enough. That covers Health Net, Molina, Anthem Blue Cross, Kaiser, IEHP, and L.A. Care. Moreover, they are even less likely to track the separate PDR, AB 72, and Medicare clocks.

Specialty-trained OBGYN Billing Services in California rest on the same OBGYN Billing Services discipline applied nationally. They build payer-specific variance checks and deadline tracking into standard Revenue Cycle Management, not a once-a-year audit.

See MBC’s guidance on billing global maternity packages correctly in California for the coding side.

Practices with unworked Legacy AR or old AR recovery balances face a compounding issue. In short, staff already chasing aged claims have little bandwidth left to track six dispute clocks.

Any physician added without airtight credentialing risks claims paid at default rates across several plans at once.

Manual Sampling vs. Contract Modeling vs. Automated Variance Detection

The 25 to 50 claim sample in Section 5 tells a group whether it has a problem. It cannot run the recovery program, because payers also apply new NCCI edits or LCDs retroactively, which creates fresh variance every month.

Software only flags the variance. Someone still has to classify the root cause, choose the filing track, and file before the window closes.

How MBC Resolves OBGYN Underpayments for California Practices

MBC treats underpayment recovery as a standing process, not a one-time cleanup. The aim is to shrink what OBGYN underpayments cost California groups every month. The work runs in six steps, and each one closes a gap described above.

1. Load the contracts. MBC loads every payer contract and plan-specific fee schedule, then maps each one by CPT code and modifier. The team knows the expected payment for each claim line before the remittance arrives.
2. Compare every remittance line. The team does not rely on a 25 to 50 claim sample. Instead, it checks paid claims against the expected amount line by line and flags any variance at posting.
3. Classify the root cause. The team tags each variance by cause, because the cause determines the remedy. Tags include global package repricing, a fee schedule error, a modifier edit, an AB 72 rate, or a credentialing default.
4. File on the right track, inside the deadline. Medi-Cal managed care disputes go through the plan’s PDR process. AB 72 disputes move from PDR to the DMHC independent dispute resolution process. Finally, Medicare variances go to Noridian as redetermination requests. Every claim carries its own deadline from the day the team flags it.
5. Fix the source. MBC corrects recurring causes upstream. The fixes include coding edits, eligibility checks at scheduling, fee schedule corrections with the payer, and enrollment for new physicians.
6. Report by payer and county. Monthly reporting shows variance found, disputes filed, dollars recovered, and windows still open. As a result, leadership sees underpayment exposure as its own line, not inside a blended collections number.

Start With a Revenue Diagnostic

The engagement starts with a Revenue Diagnostic. This review compares first-half remittance against your contracts, sizes the exposure, and identifies which filing windows are still open. From there, recovery and prevention run side by side. The practice recaptures what is still recoverable while the same variance stops recurring on new claims.

Why This Is an EBITDA Problem for Multi-Site California Groups

For a single-site practice, the checklist above is workable with disciplined internal tracking. However, multi-site groups and PE-backed platforms span counties with different plan mixes. As a result, their consolidated collections report blends payer-level variance into one number. A systemic underpayment in one county’s dominant plan then sits invisible inside an otherwise healthy statewide figure. It stays there until a quality-of-earnings review finds it. At that point it lands as a downward adjustment to net realized revenue, not a correctable finding. Protecting Yield EBITDA from this leakage is an Enterprise Revenue Integrity and Revenue Cycle Management function. It requires county-by-county, payer-by-payer visibility, with a dedicated account manager tracking every deadline in parallel. In contrast, a once-a-year spot check only catches variance after the filing windows have closed.

Underpayment KPIs California OBGYN CFOs Should Track Monthly

Leadership cannot manage what reports blend away. Track these five metrics by payer and by county:

• Variance incidence rate: percentage of paid lines below the contracted rate
• Underpayment dollars identified: gross exposure found in the month
• Recovery rate: dollars recovered divided by dollars disputed
• Open window exposure: disputed or undisputed dollars still inside their filing deadline
• Expired write-offs: variance lost because a window closed, which should trend toward zero

A rising expired write-off figure points to a capacity problem. A rising variance rate at one plan points to a contract or configuration problem.

Using Underpayment Data to Renegotiate Payer Contracts

Underpayment recovery fixes the past. Contract strategy protects the next 12 months. Variance analysis can uncover insights that feed future payer contract negotiations.

Walk into renegotiation with three things: the plan’s variance rate against your peer plans, the dollar value of its recurring short-pay patterns, and its average PDR resolution time. A plan that repeatedly misloads your fee schedule has a weaker case for holding rates flat. Clean, payer-level evidence turns a rate request into a documented performance discussion.

Why California OBGYN Practices Choose MBC

Recovering underpayments in California takes specialty coding knowledge, payer-specific rules, and enough capacity to track every deadline at once. MBC brings all three.

• 25+ years in medical billing. MBC supports physician practices across all 50 states and more than 32 specialties, with OBGYN as a dedicated specialty.
• OBGYN-trained coders and billers. The team works global maternity packages, high-risk and MFM co-management, gynecologic surgery, and in-office procedures every day.
• California payer knowledge. Medi-Cal managed care plans and DMHC-regulated commercial plans each have their own rules. So do AB 72, AB 3275, CalAIM encounter reporting, and Noridian. The team works within all of them.
• Measurable results. A 97 percent clean claim rate and a 30 percent reduction in A/R within 90 days.
• A dedicated account manager. One point of contact tracks your payers, your deadlines, and your reporting.
• Custom-quoted engagements. Scope is built around your payer mix, claim volume, and number of sites.

The difference shows up in what leadership can see. The practice no longer learns about a payer’s short-pay pattern months later in a year-end review. It gets payer-level variance reporting while it can still file disputes. It also gets a clear record of what MBC recovered and what it fixed at the source.

Conclusion

The first half of 2026 is closed. What OBGYN underpayments cost California practices in that period is now fixed. However, much of it is still recoverable. For California OBGYN groups, the clock on Medi-Cal PDR filings, AB 72 disputes, and Medicare redeterminations is already running. A practice that identifies its exposure now still has time to file correctly against most of that window. However, a practice that waits for a year-end audit does not. MBC’s OBGYN Billing Services in California bring 25+ years of specialty experience. In addition, clients see a 97% clean claim rate and a 30% A/R reduction within 90 days. That experience helps groups handle this sequencing problem across multiple payers at once. Request a Revenue Diagnostic to see what your first half actually cost and which filing windows are still open.

Frequently Asked Questions