Guide 13: Orthopaedic Surgery Coding | PhysicianCodingGuide.com

Orthopaedic clinical work is physically and cognitively demanding, and the providers doing it, surgeons, sports medicine physicians, and the APPs who keep these clinics running, deserve a billing picture that reflects that. Orthopaedic surgery coding has some of the most financially significant opportunities for accurate billing, and some of the most common patterns of missed revenue. The reasons are structural: the global surgery period bundles a significant amount of real clinical work into procedure codes without adequate physician awareness, and the fracture care code set is genuinely complex. This chapter focuses on the E/M and clinic side; fracture care gets its own dedicated treatment in Chapter 26.

E/M in Orthopaedic Clinic: The Basics

Orthopaedic clinic E/M coding follows the same 2021 MDM rules as every other outpatient specialty. The MDM framework is, if anything, well-suited to orthopaedic practice, because the complexity of a musculoskeletal problem maps cleanly onto the MDM table:

A new patient with an acute fracture, imaging review, and a surgical decision involves moderate-to-high complexity MDM.
An established patient with a progressing joint arthritis where you are adjusting the management plan (adding injections, discussing surgical timing, coordinating with PT) represents moderate complexity.
A routine post-operative follow-up for an uncomplicated case, where the patient is healing well and the plan is unchanged, may legitimately be low complexity, but that assumes it is not bundled into the global period.

Global Surgery Periods: What Gets Bundled

Every surgical CPT code has a global surgery period, a number of days following the procedure during which follow-up care is considered included in the procedure's payment. For major surgery (most procedures orthopaedic surgeons perform), the global period is 90 days. For minor procedures, it is typically 0 or 10 days.

During the global period, routine post-operative E/M visits related to the surgery are bundled. You cannot separately bill an E/M for a follow-up visit where you are simply checking how the patient is healing from their recent surgery, that work is already included in the surgical fee.

What Can Be Billed During the Global Period

The following can be billed separately even within the global period:

Unrelated problems: If the patient comes in during their post-op period and you address a completely unrelated medical issue, that visit can be billed with Modifier 24 (unrelated E/M service during post-op period).
Complications requiring significant additional work: If a complication arises that requires a clinical evaluation substantially beyond routine post-op care, that can be billed separately with Modifier 24. The documentation must be clear that the additional work was not routine.
Decision for return to OR: If you determine during a post-op visit that the patient needs a return to the operating room, that E/M service can be billed separately.

Modifier 24: The post-op period carve-out

Modifier 24 appended to an E/M code tells the payer that this service, performed during the global period, is unrelated to the original surgery. The documentation must clearly describe the unrelated problem being addressed. Without Modifier 24, any E/M billed during the global period will be automatically denied as bundled.

New Patient Consultations in Orthopaedic Practice

New orthopaedic patient visits are often high-complexity from the start: a new patient presenting with a complex injury, a complicated post-traumatic problem, or a surgical decision typically involves multiple problems, imaging review, and a significant risk decision. These visits frequently support a 99204 or 99205, yet many orthopaedic surgeons reflexively bill 99203.

For a new patient where you review outside records, interpret imaging, and make a surgical or non-surgical management decision, the MDM complexity is typically moderate to high. Document the problems addressed, the imaging you independently reviewed and interpreted, and the risk of the management decision you made. That documentation supports a higher-level new patient code.

You do not have to be the operating surgeon to get the credit

A point that helps non-operative physicians and APPs: the decision-making credit for discussing surgery does not require that you be the one who operates. If you evaluate a patient, review imaging, and have a genuine discussion of surgical options, including the risks, benefits, and alternatives, that decision making counts toward the visit's complexity even if the patient is ultimately referred elsewhere for the operation. A non-operative sports physician or an APP who works up a surgical candidate and documents that discussion is capturing real, creditable cognitive work.

Procedures and Same-Day E/M: Modifier 25 in Orthopaedics

As covered in Chapter 6, Modifier 25 applies when you perform a procedure and also conduct a separately identifiable E/M on the same day. In orthopaedic practice, this commonly arises when you see a patient, evaluate their condition fully (addressing the diagnosis, reviewing imaging, discussing options), and then proceed to perform an injection or other minor procedure. If the evaluation is genuinely separate from the procedure decision, if you evaluated things beyond the specific indication for the procedure, Modifier 25 applies.