Podiatry Coding & Billing Alert

Learn how to identify fractures and treatment from the documentation.

Podiatrists frequently treat ankle fractures, and these injuries range from simple nondisplaced fractures treated conservatively to complex fractures that require open reduction and internal fixation. Because treatment varies widely depending on fracture severity and anatomy, podiatry coders like you must accurately capture both the diagnosis and the procedure performed.

Continue reading to learn how correct coding for ankle fractures requires a strong understanding of fracture anatomy, CPT^® procedure codes, and ICD-10-CM diagnosis coding rules.

Understand Ankle Fracture Anatomy

The ankle joint forms where the tibia and fibula meet the talus. The distal ends of the tibia and fibula create the malleoli, which stabilize the ankle joint. Fractures typically involve one or more of these structures, and providers classify them based on the number of malleoli involved:

• Unimalleolar fractures involve either the medial malleolus of the tibia or the lateral malleolus of the fibula
• Bimalleolar fractures involve both the medial and lateral malleoli
• Trimalleolar fractures include the medial malleolus, lateral malleolus, and posterior malleolus of the tibia

Note: Providers may describe the posterior malleolus as the “posterior lip” of the tibia in operative reports.

Ankle fracture coding relies heavily on documentation, which should include the fracture location, the number of malleoli involved, whether the fracture is displaced, and whether the patient received closed or open treatment.

Learn the Ankle Fracture ICD-10-CM Codes

The correct ICD-10-CM code for an ankle fracture will accurately reflect the fracture location, laterality, displacement status, open versus closed status, and encounter type. Most ankle fracture diagnoses fall within the S82.- (Fracture of the lower leg, including ankle) code category.

When both the medial and lateral malleoli fracture, select the appropriate code from the S82.84- (Bimalleolar fracture of lower leg) subcategory. If the injury involves three malleoli, assign a code from S82.85- (Trimalleolar fracture of lower leg). You should rely on physician documentation to determine the exact fracture pattern rather than assuming the number of fractures.

To identify the stage of care, ICD-10-CM fracture codes require a 7^th character. Assign the 7^th character “A” for an initial encounter when the patient receives active treatment, including surgical repair. Later visits during the healing process use different 7^th characters, such as:

• D: Subsequent encounter for routine healing
• G: Delayed healing
• K: Nonunion
• S: Sequela

Example: A patient presents with a displaced fracture of the lateral malleolus of the right fibula after a fall. The provider treats the patient surgically during the initial encounter, and documentation indicates the fracture is closed.

First, select the appropriate code range based on the fracture location. Because the fracture involves the lateral malleolus of the fibula, begin with S82.6- (Fracture of lateral malleolus). Then, consider laterality and displacement. In this scenario, the fracture occurs on the right side, which directs you to S82.61- (Displaced fracture of lateral malleolus of right fibula).

Because the documentation states that the fracture is closed and this is the first encounter for this injury, the correct code is S82.61XA (Displaced fracture of lateral malleolus of right fibula, initial encounter for closed fracture).

Know the Codes for Ankle Fracture Treatment

To code ankle fracture treatment procedures, start with the 27750 (Closed treatment of tibial shaft fracture (with or without fibular fracture); without manipulation) through 27848 (Open treatment of ankle dislocation, with or without percutaneous skeletal fixation; with repair or internal or external fixation) code range.

These codes distinguish between closed treatment and open treatment. Closed treatment occurs when the provider manages the fracture without surgically exposing the fracture site, while open treatment requires surgical exposure of the bone and often includes internal fixation.

Physicians often perform closed treatment for less severe fractures. For example, 27786 (Closed treatment of distal fibular fracture (lateral malleolus); without manipulation) describes closed treatment of a distal fibular fracture without manipulation; but if the provider manually realigns the fracture before immobilization, report 27788 (… with manipulation), which describes closed treatment of a distal fibular fracture with manipulation.

Closed treatment codes also exist for medial malleolus fractures. Code 27760 (Closed treatment of medial malleolus fracture; without manipulation) describes closed treatment of a medial malleolus fracture without manipulation, while 27762 (… with manipulation, with or without skin or skeletal traction) applies when the physician performs manipulation to restore alignment. In these situations, physicians typically stabilize the ankle with a cast or splint after the reduction.

When fractures require surgical repair, use open treatment codes. For example, 27792 (Open treatment of distal fibular fracture (lateral malleolus), includes internal fixation, when performed) describes open treatment of a distal fibular (lateral malleolus) fracture, and 27766 (Open treatment of medial malleolus fracture, includes internal fixation, when performed) describes open treatment of a medial malleolus fracture. Both of these codes include internal fixation when performed, so you shouldn’t report additional codes for plates, screws, or other fixation devices used during the procedure.

More complex injuries often involve multiple malleoli. Assign 27814 (Open treatment of bimalleolar ankle fracture (eg, lateral and medial malleoli, or lateral and posterior malleoli, or medial and posterior malleoli), includes internal fixation, when performed) for open treatment of a bimalleolar ankle fracture, which includes internal fixation when performed. Make sure to confirm that the surgeon repaired both malleoli surgically before assigning this code.

Trimalleolar fractures are even more complex, and the correct code for these injuries depends on whether the surgeon repaired the posterior malleolus. CPT^® code 27822 (Open treatment of trimalleolar ankle fracture, includes internal fixation, when performed, medial and/or lateral malleolus; without fixation of posterior lip) describes open treatment of a trimalleolar fracture without fixation of the posterior lip. However, if the surgeon also fixes the posterior malleolus, the proper code is 27823 (… with fixation of posterior lip), which includes the additional surgical work.

Some ankle fractures also disrupt the distal tibiofibular syndesmosis, a ligament complex that stabilizes the ankle joint. In these cases, surgeons may perform additional fixation to restore stability. Code 27829 (Open treatment of distal tibiofibular joint (syndesmosis) disruption, includes internal fixation, when performed) applies to open treatment of distal tibiofibular joint disruption with internal fixation. Surgeons may perform this procedure during fracture repair, and coders may report 27829 in addition to the fracture repair when documentation supports separate syndesmotic stabilization.

Avoid These Ankle Fracture Coding Pitfalls

Use caution to avoid these common errors:

• Do not assign bimalleolar or trimalleolar procedure codes without documentation confirming multiple fractures.
• Avoid reporting internal fixation devices separately, as most open fracture repair codes already include hardware placement.
• Do not report a subsequent encounter during an initial treatment.

Let’s review an example that avoids these common pitfalls: A patient presents with a displaced bimalleolar fracture of the right ankle following a fall and their surgeon performs open reduction and internal fixation of both the medial and lateral malleoli. You’ll assign 27814 to report the open treatment of the bimalleolar ankle fracture and S82.841A (Displaced bimalleolar fracture of right lower leg, initial encounter for closed fracture) as a diagnosis. If the surgeon also performs syndesmotic stabilization and documentation supports the additional procedure, report 27829 in addition to 27814.

Michelle Falci, BA, M Falci Communications LLC