CPT code 23615 – Open treatment of proximal humeral fracture

Key takeaways

CPT code 23615 covers open treatment of a proximal humeral surgical or anatomical neck fracture. Internal fixation and tuberosity repair are included when performed and are not separately billable.

Use CPT 23616 instead when the surgeon places a proximal humeral prosthesis. The intraoperative decision, recorded in the operative note, drives the code.

A 90-day global period bundles routine post-op visits, cast removal, and suture removal. Unrelated E&M visits (modifier -24) and returns to the OR for complications (modifier -78) are billed separately.

Pabau’s claims management software runs validation checks before a claim is sent, confirming the insurer details the payer needs are in place.

CPT code 23615: Official description and clinical scope

CPT code 23615 belongs to the American Medical Association’s CPT code set. Its descriptor reads: Open treatment of proximal humeral (surgical or anatomical neck) fracture, includes internal fixation, when performed, and includes repair of tuberosity(s), when performed.

The code sits within the CPT range for surgical procedures on the shoulder (23000-23929). It applies when the surgeon treats a fracture at the surgical or anatomical neck of the proximal humerus through an open approach. Closed and percutaneous methods fall outside it.

Two anatomical sites are covered. The surgical neck sits just below the greater and lesser tuberosities and is the most common fracture site in this region. The anatomical neck runs between the articular surface and the tuberosities. Both are captured under 23615 when treated open.

What the procedure involves

Open treatment of a proximal humeral fracture follows a consistent operative sequence. The surgeon makes a deltopectoral or anterolateral incision, exposes the fracture, reduces the bone fragments, and stabilizes the construct.

Fixation options include locking plates and screws, intramedullary nails, or suture constructs depending on fracture pattern and bone quality. When the greater or lesser tuberosity is displaced, the surgeon reattaches it to the humeral shaft as part of the same procedure.

• Incision and fracture exposure (open approach)
• Fracture reduction under direct visualization
• Internal fixation with plates, screws, or intramedullary nail when indicated
• Tuberosity reattachment when displaced fragments are present
• Wound closure and dressing

What is included and excluded in CPT 23615

The AMA descriptor bundles internal fixation and tuberosity repair into 23615 whenever they are performed. Billing either as a separate CPT code on the same claim date is an NCCI bundling violation.

CPT 23615 vs CPT 23616: Choosing the right code

CPT 23615 is the correct code when the surgeon reduces and stabilizes the fracture with or without internal fixation. CPT 23616 applies when the surgeon replaces the humeral head with a proximal humeral prosthesis during the same procedure. The intraoperative decision determines the code, not the pre-operative plan.

When pre-op planning calls for 23615 but the surgeon converts to prosthetic replacement intraoperatively, the operative note must document the reason. Typical reasons are comminution beyond fixation, avascular necrosis risk, or poor bone quality. That documentation supports the switch to 23616 and protects the claim in a medical necessity audit.

ICD-10 diagnosis codes that pair with CPT code 23615

Every claim for CPT code 23615 requires a supporting ICD-10-CM diagnosis code that establishes medical necessity. Laterality is required on all S42 codes for initial encounters. The CMS ICD-10-CM code files confirm the valid 7th characters for encounter type.

Non-displaced fractures (S42.214A, S42.215A) require strong documentation to support open treatment. Payers may question why an open approach was chosen over conservative management. The operative note must explicitly state the reason. Common reasons include vascular compromise, neurovascular injury, failed closed reduction, or patient-specific factors such as osteoporotic bone that cannot be managed non-operatively.

Modifiers for CPT code 23615

Correct modifiers on CPT code 23615 prevent automatic rejections before a human reviewer sees the claim. Missing or incorrect modifiers are a frequent denial trigger in orthopedic medical billing, and shoulder procedures are no exception.

Global period, post-op care, and billing during the global package

CPT code 23615 carries a 90-day global period under the CMS global surgery package. The global period begins the day after the procedure date. All routine post-operative services related to the surgery are bundled into the surgical payment for 90 days.

What is included in the 90-day global

• All routine post-op office visits for fracture healing evaluation
• Suture and staple removal
• Cast application, removal, and replacement related to the surgery
• Dressing changes performed by the surgeon or their team
• X-ray interpretation ordered as part of routine fracture follow-up

What is separately billable within the global window

• E&M visits for unrelated conditions, billed with modifier -24
• Return to the OR for a complication, such as hardware failure requiring revision, billed with modifier -78
• Physical therapy services billed by the PT practice (not bundled into surgeon’s global)
• New fractures or unrelated injuries

Billing an unrelated office visit inside the global window without modifier -24 is a frequent orthopedic billing error. The payer bundles the visit into the surgery and denies it, and the appeal can take weeks.

Medicare reimbursement and fee schedule for CPT code 23615

Medicare reimbursement for CPT code 23615 is calculated using the Medicare Physician Fee Schedule (MPFS). It varies by geographic location through the Geographic Adjustment Factor (GAF). Rates below reflect 2026 national benchmarks (facility and non-facility RVUs are equal for 23615). Use the CMS MPFS lookup tool to verify current rates for a specific locality before quoting expected reimbursement.

Once a payment posts, compare the amount received with the expected MPFS figure for your locality. A shortfall that repeats across 23615 claims points to a systematic underpayment worth raising with the payer before it becomes a write-off.

Documentation requirements for CPT code 23615

Every element of the operative note for CPT code 23615 maps directly to a denial risk. Billing compliance requirements for major surgical codes require the operative report to document what was done and why each component of the procedure was performed.

• Fracture confirmation: Pre-operative imaging (X-ray, CT) confirming fracture location at the surgical or anatomical neck
• Fracture type: Displaced vs. non-displaced; comminution pattern (2-part, 3-part, 4-part per Neer classification)
• Surgical approach: Deltopectoral, anterolateral, or other, named and documented
• Fixation construct: Type and description of internal fixation used (e.g., proximal humeral locking plate, specific intramedullary nail system)
• Tuberosity status: Whether tuberosities were involved and how they were addressed. This supports the inclusion of tuberosity repair.
• Laterality: Left or right shoulder, recorded in both the operative note and the claim
• Medical necessity rationale: Why open treatment was chosen rather than closed or percutaneous management

For non-displaced fractures, the medical necessity rationale is particularly important. Document failed closed reduction attempts, neurovascular compromise, associated rotator cuff tear requiring open repair, or inability to maintain adequate closed reduction given fracture pattern.

Prior authorization requirements for CPT 23615

Traditional Medicare (Parts A and B) generally does not require prior authorization for inpatient major surgical procedures, including CPT 23615, under standard fee-for-service coverage. Other payer types set their own rules.

Running insurance eligibility verification before scheduling surgery identifies whether the patient’s plan requires authorization and what documentation the payer expects.

• Medicare Advantage plans: Many require prior authorization for elective major orthopedic surgery, including non-displaced fractures treated open. Requirements vary by plan and region.
• Commercial insurers: Many commercial plans require prior authorization for CPT 23615. Standard authorization packets include operative plan, imaging reports, fracture severity documentation, and the proposed ICD-10 codes.
• Emergency fracture pathway: Acute fracture care with neurovascular compromise may qualify for emergency exception. Document the emergency presentation and treatment timeline; post-authorization is often required within 24-48 hours.
• Medicaid: Rules are state-specific. Many state Medicaid programs require prior authorization for major surgical procedures, so verify at the payer level rather than assuming by state.

Common denial reasons for CPT code 23615 and how to prevent them

Good denial management workflows catch CPT 23615 denials before submission, because the causes below repeat from claim to claim. When one slips through, the remittance names it with a reason code, explained in our guide to payer denial codes.

Laterality modifiers and bundled services in the table above need a coder’s review against the operative note before submission. A clean claim submission avoids the days in A/R that denial appeals add to the revenue cycle.

Related shoulder CPT codes and when to use them

Coders working with proximal humerus fractures regularly compare CPT 23615 against adjacent codes. The table below maps the most-compared shoulder procedure codes to their distinct clinical scenarios, using the AAPC CPT code reference as a crosswalk guide. If the surgeon reduces a displaced fracture without an incision, report CPT 23605 instead.

Read as a decision, the choice comes down to two questions. Was the fracture site opened, and did the humeral head stay in place?

Anesthesia crosswalk for CPT 23615

The anesthesia code typically crosswalked to CPT 23615 is 01630. It covers anesthesia for open or surgical arthroscopic procedures on the humeral head and neck and shoulder joint, not otherwise specified. Anesthesia is billed separately by the anesthesiologist or CRNA using time-based units and does not conflict with or duplicate the 23615 surgical claim. The surgical team and anesthesia team submit independent claims to the payer.

How Pabau keeps CPT 23615 claims complete before they go out

In many orthopedic practices, the billing team builds the 23615 claim after the operative note is signed and re-keys insurer details into a clearinghouse portal. A missing membership number or authorization code then surfaces only when the claim comes back.

Pabau keeps those details on the patient record, and its validated claims management checks them before the claim is sent. Validation confirms that the insurer details the payer needs, such as membership numbers and authorization codes, are in place.

The claim then goes out as a CMS-1500 through Pabau’s Claim.MD integration, which reaches thousands of US payers. Fewer claims bounce for missing insurer data, so coders can spend their review time on laterality, bundled services, and the 23615 versus 23616 decision.

Stop losing reimbursement on complex surgical codes

Pabau runs validation checks before a claim is sent, confirming the insurer details the payer needs are in place. Claims for CPT 23615 and similar high-value surgical codes reach the payer complete.

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Conclusion

Code 23615 from the signed operative note, never from the surgical booking. The intraoperative finding decides between 23615 and 23616, and the note has to say why.

The trade-off worth accepting is a short pre-submission review on every case. Checking laterality, bundled components, and authorization takes minutes, while an appeal on a 90-day global case can hold payment for weeks.

Book a demo to see how Pabau checks insurer and authorization details before your orthopedic claims go out.

Continue your research

Need to understand how clearinghouse claim submission works end to end? Medical claims clearinghouse guide explains how 837P files are validated and routed to payers before payment is issued.

Tracking underpayments on surgical codes after claims are paid? Electronic remittance advice (ERA) explained covers how to read 835 remittance files and identify systematic underpayments by CPT code.

Got a reason code back on a 23615 claim? Denial codes in medical billing maps common CARC denial reason codes to their appeal pathways.

Treating the fracture closed instead? CPT code 23605 covers closed treatment of a proximal humeral fracture with manipulation.

Is the fracture limited to the greater tuberosity? CPT code 23620 covers closed treatment of a greater humeral tuberosity fracture with manipulation.

Frequently asked questions