Orthopedic medical billing is shaped by the surgical global package more than by any other rule. Once a fracture is reduced or a joint is replaced, the visits that follow are already paid inside the procedure, and every claim sent during that window has to explain why it is different. Add comp carriers with their own fee schedules, braces supplied under separate standards and drugs that need an authorization the procedure does not, and the coding decision on the day of service decides whether the case pays once or denies in pieces.
Fracture care: global package or itemized visit
A closed distal radius fracture can be reported two ways. The fracture care code, 25600 without manipulation or 25605 with manipulation, is a surgical package that pays for the reduction, the first cast and routine follow-up through the global period. The alternative is the E/M visit plus the cast application (29075 for a short arm cast) and supplies, with later visits billed on their own.
The package fits when your surgeon will manage the fracture through healing. Itemizing fits when the patient was seen once and referred out. A recast inside the global is billable with the casting code while the E/M that day is not. We flag both paths at charge entry so the physician confirms the intent.
Modifiers 24, 25, 57, 58, 78 and 79 in the post-op window
The decision to operate, made at the visit before a major procedure, is billable with modifier 57 on the E/M. Before a minor procedure, the same visit carries modifier 25 and needs a documented problem beyond the decision itself. Swapping the two is the most common reason the visit is denied.
Inside the global, an E/M for an unrelated problem takes modifier 24 and a diagnosis that plainly differs from the surgical one. A planned second stage, like hardware removal, is modifier 58. An unplanned return to the operating room is modifier 78 and pays at the intraoperative portion. A procedure on an unrelated body part is modifier 79 and starts its own global. Our coders read the operative note against the original surgery date before choosing.
Laterality, multiple procedures and the seventh character
Almost every orthopedic code describes an extremity, so RT or LT belongs on the line, and a claim without it is the easiest duplicate denial to avoid. Bilateral work is modifier 50 on one line for most payers and two lines with RT and LT for others; we store the convention per payer. When several procedures share a session, the highest-valued one goes first and the rest carry modifier 51 or are reduced automatically, so line order decides how much of the second procedure is paid.
The diagnosis carries its own episode marker. Fracture codes end in a seventh character: A for active treatment, D for routine healing, S for a sequela such as malunion. The surgery claim takes A, the cast check takes D, and a claim that mixes them reads as a coding error.
Arthroplasty, arthroscopy and the NCCI bundling edits
Total knee arthroplasty (27447) and total hip arthroplasty (27130) are the highest-value professional claims in the practice and the ones most often held for authorization. Plans want conservative treatment and imaging documented, and the approval has to name the correct procedure, side and facility.
Arthroscopy is where the bundling edits bite. Medial and lateral meniscectomy in the same knee is one code, 29880, not two units of 29881. Debridement in the same compartment bundles into the meniscectomy under the NCCI pairs and cannot be separated with modifier 59 unless a different compartment is documented. In the shoulder, subacromial decompression 29826 is an add-on that pays only alongside a primary arthroscopy such as rotator cuff repair 29827.
Injections, viscosupplementation and in-office imaging
Large joint injections are reported with 20610, or 20611 when ultrasound guidance is used and a permanent image is saved to the record; 20611 without the stored image is the injection denial we see most on audit. The drug is billed on its own line with the J code and NDC.
Hyaluronan viscosupplementation, products such as J7325 and J7321, needs authorization for the drug even though the procedure code does not. Plans specify the covered product, injections per series and the interval between series, and a claim outside those rules denies for medical necessity. Office X-rays such as a knee series (73562) are billed globally when the practice owns the equipment and reads the film; when an outside radiologist reads, the practice bills TC and the reader bills 26.
Braces, casting supplies and workers' compensation billing
Dispensing a knee orthosis (L1832) or wrist orthosis (L3908) from the office makes the practice a DMEPOS supplier, with its own standards: a written order, proof of delivery, and no separate brace payment when the payer treats it as part of a same-day procedure. Casting supplies are reported with Q codes by body part and material; a fracture claim without the supply line leaves that work unpaid.
Workers' compensation and auto liability claims follow the state fee schedule rather than the payer contract, require the claim number, date of injury and employer, and often demand a separate form and utilization-review approval. We keep a per-state checklist so these claims are complete on first submission. An in-house therapy department follows our physical therapy billing rules.
How we take on orthopedic billing
We start with a free review of your accounts receivable, sorted by why claims are sitting: arthroplasty waiting on authorization, post-op visits missing a modifier and comp claims aging past the carrier's window each need a different remedy. We work inside your PM system and EHR, our coders hold AAPC or AHIMA credentials, and a BAA is executed before any chart is shared. The transition is a parallel run of two to four weeks in which your outgoing biller and our team code the same operative notes and every disagreement is settled on the record. After the initial term the agreement is month to month, with a named account manager who knows your surgeons and comp carriers.
Codes and Modifiers We Watch in Orthopedics
The codes that most often decide whether a orthopedics claim pays.
| Code | What it is | What goes wrong |
|---|---|---|
| 25600 / 25605 | Closed treatment of distal radius fracture, without / with manipulation | A global package covering reduction, first cast and follow-up. An E/M for a cast check inside the global denies as included. |
| 29075 / 29125 | Application of short arm cast / short arm splint | Billable with an E/M when fracture care is not packaged, and for a replacement cast inside a global. |
| Modifier 57 / Modifier 25 | Decision for surgery / separately identifiable E/M | 57 before a major procedure, 25 before a minor one. Swapping them bundles the visit. |
| Modifier 24 / 58 / 78 / 79 | Unrelated E/M, staged procedure, return to OR, unrelated procedure in the global | Each must line up with the original surgery date and diagnosis. |
| Modifier 50 / RT / LT / 51 | Bilateral procedure, right, left and multiple procedures | Laterality on every extremity code. Payers differ on 50 versus two lines; 51 is applied by most payers automatically and by some only when sent. |
| 27447 / 27130 | Total knee arthroplasty / total hip arthroplasty | Nearly always needs prior authorization matching procedure, side and facility. |
| 29881 / 29880 | Knee arthroscopy with meniscectomy, one compartment / both | Debridement in the same compartment bundles under NCCI. Two units of 29881 for both menisci is a coding error. |
| 20610 / 20611 | Major joint injection without / with ultrasound guidance | 20611 requires a permanently recorded image. The drug goes on a separate line. |
| J7325 / J7321 | Hyaluronan viscosupplementation, per dose | Product, injections per series and interval are plan-specific and usually need authorization. |
| L1832 / L3908 | Knee orthosis, adjustable / wrist orthosis, prefabricated | Requires DMEPOS supplier standing, a written order and proof of delivery. |
Common Orthopedics Denials and How We Fix Them
- CO-97
A post-operative visit or cast check is denied as included in the surgery because it fell inside the global period without a modifier.
FixConfirm from the note whether the visit was unrelated (modifier 24) or routine post-op care to be written off. Resubmit only when documentation supports the modifier.
- CO-4
The procedure code is inconsistent with the modifier, typically 59 on a bundled arthroscopy pair, 25 where 57 was required, or 50 on a code the payer wants as RT and LT lines.
FixRe-read the operative note against the NCCI pair, the global indicator and the payer’s bilateral convention, correct the modifier, and submit a corrected claim.
- CO-197
Arthroplasty, advanced imaging or a viscosupplementation series is denied for missing or non-matching prior authorization.
FixRequest retro-authorization where the plan permits it, otherwise appeal with the surgical indication and conservative treatment record.
- CO-50
A hyaluronan injection, brace or repeat imaging study is denied as not medically necessary because the diagnosis or interval fell outside the plan’s policy.
FixAppeal citing the plan’s own criteria, and correct the injection calendar so the next series lands inside the covered window.
- CO-16
A workers’ compensation or auto liability claim is returned for missing information, usually the claim number, date of injury or employer.
FixComplete the claim from the intake record and resubmit on the carrier’s form with the utilization-review approval attached.
| Major surgery global period | 90 days following the procedure, with the day before included for major proceduresSource: CMS, Physician Fee Schedule global surgery rules |
|---|---|
| Bundling edits applied | NCCI procedure-to-procedure pairs and medically unlikely editsSource: CMS, National Correct Coding Initiative |
Orthopedics Billing: Common Questions
It depends on who manages the fracture through healing. When your surgeon follows the patient through the global period, the fracture care code usually captures the work better. When the patient was seen once and referred out, itemizing is the accurate choice.
Because the visit went out without modifier 24, or with a diagnosis that matched the surgical one. An unrelated E/M inside the global needs both the modifier and a clearly different diagnosis. We check every visit dated inside an open global before release.
Yes. Arthroplasty approvals are tracked against the surgery schedule with procedure, laterality and facility confirmed. Hyaluronan series are tracked by product and interval so each injection falls inside the plan’s covered window.
These claims follow the state fee schedule instead of your payer contract, require the claim number, date of injury and employer, and often need a state-specific form and utilization-review approval. We keep a checklist per state and carrier so the claim is complete the first time.
Because it tells the payer where the patient is in the episode. The initial-encounter character belongs on the visit where the fracture is actively treated, the subsequent-encounter character on routine healing visits, and a sequela character on late effects. A subsequent-encounter code on a surgery claim, or an initial one on a cast check, is a mismatch that draws a medical necessity review.