CPT code 20697: Strut exchange billing guide

Key takeaways

CPT code 20697 covers the exchange of a strut, meaning its removal and replacement, and the unit of service is each strut exchanged.

The code belongs to the stereotactic external fixation family led by CPT 20696. It is not an application code, and not an alternative to CPT 20692.

CPT 20697 carries a 0-day global period and 0.00 work RVUs, and it is exempt from modifier 51.

Practice management software like Pabau helps surgical billing teams document each exchange, report the right units, and track global period windows.

According to the American Medical Association’s CPT code set, CPT code 20697 covers the exchange of a strut, meaning its removal and replacement. The descriptor ends with the word “each,” so one strut is the unit of service.

The code sits in the external fixation range of the Musculoskeletal System section, next to CPT 20696. That code covers application of a multiplane, unilateral, stereotactic computer-assisted external fixation system, such as a spatial frame.

That relationship is the point of 20697. It reports the strut swaps performed on a stereotactic frame during a correction. It is not a frame application code, and it is not a head-to-head alternative to CPT 20692.

These CPT billing reference guides follow the same structure: official descriptor, clinical context, billing rules, and reimbursement data. Use them together as a coding library for musculoskeletal procedures.

Procedure overview: What a strut exchange involves

A strut exchange is the removal of one adjustable strut from an external fixation frame and the fitting of a replacement. On a hexapod frame, six struts connect two rings and set the position of the bone segments in three dimensions.

Each strut has a fixed range of travel. As a deformity corrects, a strut can run out of that range, or the software-generated schedule can call for a different length. The surgeon then swaps that strut for one sized to the next stage of the correction.

The situations that lead to a strut exchange include:

• A strut reaches the end of its adjustment range partway through the correction
• The recalculated adjustment schedule calls for a longer or shorter strut
• A strut is bent, damaged, or no longer holding its setting
• The correction moves into a new plane and needs a different strut configuration
• New imaging changes the residual deformity calculation and the strut lengths that go with it

Most exchanges happen at an outpatient visit during the correction phase, with the ring construct left in place. When the frame instead needs adjustment or revision under anesthesia, check whether CPT 20693 describes the service more accurately than a strut exchange.

CPT 20697 billing guidelines and documentation requirements

Report one unit of 20697 for each strut you remove and replace, and record which struts were exchanged and why. A note that says only “struts changed” supports one unit at best, and it will not survive an audit.

The AAPC’s CPT code lookup places 20697 in the surgical section, which means the claim needs a procedure note and a linked diagnosis code. The note for a strut exchange should capture:

• The frame type and manufacturer, and the application date of the frame
• The strut positions exchanged, identified individually
• The length or size removed and the length or size installed
• The clinical reason for each exchange, such as end of travel range or hardware failure
• Any imaging performed and the recalculated adjustment schedule that followed

Practices that rely on shorthand in the visit note lose units they earned. Use digital intake and documentation forms to capture strut positions and reasons as structured fields. The coder can then count units without reading between the lines.

How many units of CPT 20697 can you report?

Report one unit for each strut you exchange, because the descriptor is written per strut. Exchange three struts at one visit and the claim carries three units of 20697, provided the note documents all three.

Unit limits still apply. Check the CMS Medically Unlikely Edits table for the current per-day maximum on 20697, and confirm how your payer wants multiple units presented. Some payers want a single line with a unit count, while others want separate lines.

Strong claims management software flags unit and bundling conflicts before submission, which cuts the back-and-forth with payers on these claims. Good HIPAA compliance for medical offices also means the supporting notes stay secure and retrievable when a payer asks for them.

Applicable modifiers for CPT 20697

CPT 20697 is exempt from modifier 51, so never append it, even when the exchange is reported with another procedure on the same day. Exempt codes are listed in CPT Appendix E and carry a matching indicator on the Medicare fee schedule file.

• Modifier 51: Not applicable. CPT 20697 is modifier 51 exempt.
• Modifiers RT and LT: Many payers want laterality on the claim, so add the side that carries the frame.
• Global period modifiers: The exchange often falls inside the post-op window of the frame application code. Confirm with the payer whether a modifier such as 58 or 79 is required on that claim.
• Units instead of repeat modifiers: Multiple struts at one visit are reported as units of 20697, not as a repeat procedure.

Medicare reimbursement for CPT code 20697

CPT 20697 carries 0.00 work RVUs, so the Medicare fee schedule assigns no physician work value to a strut exchange. Any payment therefore comes from the practice expense and malpractice components, and it will not resemble a surgical fee.

That surprises billing teams who expect a hexapod strut change to pay like a procedure. Check the code’s payment status and RVU components in the current fee schedule file before you forecast revenue from a correction protocol.

For current figures, use the CMS Physician Fee Schedule lookup tool and enter 20697 with your Medicare Administrative Contractor locality. The FastRVU RVU lookup tool shows the work, practice expense, and malpractice components side by side.

Practices using practice management tools for billing workflows can hold RVU benchmarks alongside revenue reporting. That makes it easy to see when a correction case is generating visits that carry almost no reimbursable value.

Global period and post-op considerations for CPT 20697

CPT 20697 has a 0-day global period, listed as 000 on the Medicare fee schedule. The exchange brings no pre-operative or post-operative window with it, so each medically necessary exchange can be reported on the date it is performed.

The complication sits one level up. Strut exchanges usually happen during the post-operative period of the frame application code, and that code, not 20697, sets the global window in play. Look up the application code’s global period and follow the payer’s rules for reporting inside it.

• Global period for 20697: 000, zero days
• Pre-op and post-op periods: None bundled into the exchange itself
• Repeat exchanges: Reportable each time they are performed and documented
• What still bundles: NCCI edits between 20697 and other services on the same day
• The window that matters: The post-op period of the frame application code, which may require modifier 58 or 79

Billing teams get tangled here when a patient returns every few weeks through a long correction. Each note has to say which frame application it belongs to. Structured patient records management that links every visit to the originating procedure date makes that link automatic instead of manual.

For teams building post-op tracking, simplifying practice management for post-op billing is a useful next read. It covers how integrated scheduling and documentation cut the effort of monitoring several active correction cases.

ICD-10 codes commonly paired with CPT code 20697

A strut exchange claim is supported by the condition the frame is correcting, not by a diagnosis for the strut. The codes below are the clinical indications that most often sit behind a computer-assisted frame correction.

The seventh character decides a surprising number of these claims. A strut exchange happens weeks into a correction. A fracture diagnosis therefore needs a subsequent-encounter seventh character, not the initial-encounter value. Carrying the original surgery’s character forward is a common denial trigger.

These pairings are clinical examples rather than a payer-mandated list. Your Medicare Administrative Contractor may hold a Local Coverage Determination that restricts pairings, so check the LCD database first. Orthopedic teams can keep diagnosis and procedure tracking together in physical therapy and orthopedic clinic software.

Related CPT codes in the external fixation family

CPT 20697 does not compete with the application codes. It works with them, and the code it belongs to is CPT 20696. Here is how the range fits together.

The line that trips coders up is between 20692 and 20696. Both cover a multiplane frame. Only 20696 covers the stereotactic, computer-assisted version, including the imaging and the computed adjustment schedules that come with it.

CPT 20697 sits with 20696, because struts and computed schedules are features of that frame. Reporting 20697 as a substitute for 20692, or as a second way to bill an application, misreads the range. Coders working through related orthopedic CPT coding guides will recognize the same family logic across the musculoskeletal section.

Common CPT 20697 billing errors and how to avoid them

• Using 20697 as an application code: The application codes are 20690, 20692, and 20696. CPT 20697 only reports a strut exchange.
• Assuming a 90-day global period: The global period is 000. Suppressing legitimate exchange claims because of an imagined post-op window costs the practice money.
• Appending modifier 51: CPT 20697 is exempt. The modifier is either ignored or triggers a rejection, depending on the payer.
• Reporting one unit for a multi-strut exchange: The descriptor says each. Document every strut position so the unit count on the claim matches the note.
• Forecasting a surgical fee: Work RVUs are 0.00, so build the revenue expectation for a correction protocol around the application code instead.
• Reusing the initial-encounter seventh character: Weeks into a correction, the fracture diagnosis usually needs a subsequent-encounter character.

How practice management software supports external fixation billing

A frame correction is not one claim. It is an application code, then a run of visits over months, each one potentially carrying strut exchanges, imaging, and a recalculated schedule. Most practices track that in a spreadsheet next to the chart, and units go missing.

Practice management software like Pabau keeps the whole episode in one record. The frame application date, every follow-up visit, and the struts exchanged at each one sit in the same place. A coder can then count units without hunting through free-text notes.

Our claims management software then checks the claim before it leaves, flagging bundling conflicts and missing diagnosis links. The outcome is fewer denials on low-value, high-frequency codes, and less unpaid admin time spent reworking them.

Stop losing units on external fixation claims

Pabau helps orthopedic and surgical billing teams document every strut exchange, report the right units, and track global period windows across long frame corrections.

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Conclusion

CPT 20697 is a small code that gets misread often. It reports the exchange of a strut, one unit per strut, on a stereotactic computer-assisted frame in the CPT 20696 family. It is not an application code, it carries a 0-day global period, and it is exempt from modifier 51.

Get those three facts right and the rest follows. Units match the note, modifiers match the payer, and the global period question moves to the application code.

Pabau’s claims management software helps surgical billing teams hold that detail across a long correction, from the frame application date to the final strut. To see how it fits your billing workflow, book a demo.

Continue your research

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Frequently asked questions