Orthopedic Billing Denials: The Ones That Cost the Most (and How an RCM Partner Cuts Them)

Denials are rising across the board, Kodiak Solutions put the average initial denial rate at 11.6% in 2025, up from 11.4% the year before, with prior-authorization and medical-necessity denials driving almost all of the increase. Orthopedics feels that more than most specialties, because orthopedic claims stack laterality modifiers, global-period edits, bundling rules and high-cost imaging and implants on top of each other.

1. Laterality and multiple-procedure modifiers

RT, LT and 50 tell the payer which side you operated on; 51, 59 and the X{EPSU} set tell it how multiple procedures in the same session relate. Miss the laterality modifier on a knee or shoulder procedure and the claim denies as a duplicate against the other side. Append modifier 50 when the payer wants two lines instead, and it denies for the opposite reason. Every payer has its own preference, and orthopedic schedules are full of bilateral and staged cases.

2. Global-period edits (modifiers 24, 25, 58, 78, 79)

Most orthopedic surgeries carry a 90-day global period. An office visit inside that window needs modifier 24 with a diagnosis unrelated to the surgery, or it bundles into the global fee. A planned staged procedure uses 58; an unplanned return to the OR uses 78; an unrelated procedure uses 79. Getting the return-to-OR modifier wrong is one of the most expensive orthopedic denial patterns because the underlying procedure values are high.

3. NCCI bundling on arthroscopy and injections

The CMS National Correct Coding Initiative bundles a large share of arthroscopy code pairs, a diagnostic scope into a surgical one, debridement into a definitive repair in the same compartment. Modifier 59 or the X{EPSU} modifiers unbundle a pair only when the services are genuinely separate (different compartment, different session). Used as a reflex, they trigger post-payment audits.

4. Prior authorization for imaging, DME and implants

Advanced imaging (MRI, CT), durable medical equipment and many implants sit behind prior authorization for most commercial plans. In the AMA's 2025 survey of 1,000 physicians, 95% said prior authorization delays necessary care and 79% said it leads patients to abandon treatment. In orthopedics that delay usually lands between the visit and the claim, the service is done, but it can't be billed clean until the auth is on file.

5. Site of service and medical necessity

The same procedure pays differently in an ASC, a hospital outpatient department and an office, and payers enforce LCD and NCD limits on injections, braces and imaging. A place-of-service mismatch or a diagnosis that doesn't meet the coverage policy is a clean denial every time.

How a dedicated RCM partner brings these down

A billing partner built for this scrubs every claim against payer-specific edit libraries before submission, so laterality, global-period and NCCI problems are caught while they're still fixable. Authorization status is tracked as its own step, so nothing goes out without it. Denials that do happen are root-caused by category and payer, and the fix is fed back into the scrub rules. AR is worked by recovery probability, so the high-dollar orthopedic claims most likely to pay get chased first. None of that requires new software for your staff, the partner works inside the system you already use.

Sources

Kodiak Solutions, 2025 Revenue Cycle Benchmarking analysis (initial denial rate and net revenue impact), kodiaksolutions.com.
American Medical Association, 2025 Prior Authorization Physician Survey, ama-assn.org.
Centers for Medicare & Medicaid Services, National Correct Coding Initiative Policy Manual, cms.gov.
AAPC coding resources, aapc.com.