CPT code 23600 – Proximal humerus fracture treatment

Key takeaways

CPT code 23600 covers closed, non-operative treatment of a proximal humeral fracture with no reduction or manipulation performed.

The code carries a 90-day global surgical period that bundles routine follow-up visits, cast changes, and related E/M services.

Use modifier 54 when the treating provider performs fracture care only. Use modifier 55 when a second provider takes over all postoperative management.

Practice software such as Pabau helps you submit and track 23600 claims through the Claim.MD clearinghouse, while code choice and modifiers stay with your coder.

CPT code 23600: quick reference

CPT code 23600 reports closed treatment of a proximal humeral fracture at the surgical or anatomical neck, without manipulation of the bone fragments. The table below gives the data points coders check first.

Always verify current RVU values and reimbursement rates in the CMS Physician Fee Schedule lookup tool before quoting amounts to payers or contracting teams. Rates change each January 1.

What does CPT code 23600 cover?

CPT code 23600 covers non-operative (closed) treatment of a fracture at the proximal end of the humerus. It applies when the treating provider makes no attempt to reduce or reposition the bone fragments. Both the surgical neck and the anatomical neck of the proximal humerus fall within scope.

• Surgical neck fracture: the most common proximal humerus fracture site, just below the humeral head. Minimally displaced fractures here are the primary clinical scenario for 23600.
• Anatomical neck fracture: fractures at the narrowing immediately below the humeral head. Less frequent but coded the same way when treated without manipulation.
• What “closed” means: no incision. The skin is not opened, and the fracture is managed through immobilization alone.
• What “without manipulation” means: the provider does not attempt closed reduction. Imaging confirms acceptable alignment, and the plan is immobilization in a sling or shoulder immobilizer, with activity limits and follow-up.

Clinical scenarios appropriate for 23600

The code fits when the fracture is at the proximal humerus, the approach is non-surgical, and the provider’s note documents that no reduction was performed. A typical case is an older adult who falls on an outstretched hand and arrives at the ED with shoulder pain. Imaging shows a minimally displaced two-part surgical neck fracture with alignment acceptable for conservative management.

A practice manager reviewing ED superbills can use this checklist. If every item is met, 23600 is the right code.

• The fracture is confirmed on X-ray.
• The provider applied a sling or immobilizer.
• The note documents that no reduction was performed.
• Follow-up is arranged with orthopedics.

What CPT code 23600 does not include

Getting the exclusions right prevents the most common wrong-code denials. CPT code 23600 does not include any of the following, and each one maps to a different code.

Shoulder and humerus X-rays are reported on their own radiology codes, such as 73060 for a two-view humerus series.

CPT 23600 vs. 23605 vs. 23615: choosing the right code

The proximal humerus fracture code family is compact, but the selection criteria are precise. The first decision point is whether manipulation was performed. A documented reduction moves the claim to 23605, and an open repair moves it to 23615.

The anatomical site is the second selection fork. Codes 23600 and 23605 apply to the surgical or anatomical neck of the proximal humerus, while 23620 and 23625 apply to the greater tuberosity. Confirm the fracture site in the radiology report before coding.

ICD-10 diagnosis codes to pair with CPT 23600

Payers require an ICD-10-CM diagnosis code that precisely matches the anatomical site and encounter type documented in the record. For CPT code 23600, the codes come from the S42.2 subcategory, which covers fractures of the upper end of the humerus. Confirm each code against the CDC/NCHS ICD-10-CM web tool for the current year before submitting.

ICD-10-CM has no S42.2 code specific to an anatomical neck fracture, so confirm the closest code in the CDC tool before you submit.

Use suffix A for the initial encounter, when fracture care is first provided and 23600 is billed. Suffix D covers subsequent encounters for routine healing. Inside the 90-day global window those visits are bundled. After day 90 they bill normally, and suffix D still applies. Suffix S is only for sequela, a visit that addresses a late effect of the fracture.

Always document laterality. A claim with a code for the right humerus and an operative note that says “left shoulder” invites a denial.

Global period for CPT 23600

CPT code 23600 carries a 90-day global surgical period under the Medicare Physician Fee Schedule. The global package begins the day before the procedure and runs through the 90th postoperative day.

• Bundled services (not separately billable): related E/M visits during the 90-day window, cast or splint changes, sling adjustments, and routine progress checks.
• Separately billable during the global period: a new or unrelated condition (modifier 24) and a significant, separate E/M on the procedure day (modifier 25). A return to the OR for a complication also bills separately (modifier 78).
• After the global period ends: from day 91, E/M services for the fracture bill normally. Use suffix D while routine healing continues, and S only for a late effect.

Most bundling errors happen when a routine follow-up visit is billed separately without a modifier that justifies it. The timeline below shows which services are bundled at each stage, and which modifier or ICD-10 suffix applies.

Using modifiers with CPT code 23600

The correct modifier depends on who provides care and when. For CPT code 23600, four modifiers come up most often.

Split care with modifier 54 and 55 in practice

Modifier 54/55 split care is common when an ED physician starts fracture management and an orthopedic surgeon takes over follow-up. Under Medicare rules, the global fee for CPT 23600 is divided between the two providers by the share of the global package each one delivers.

CMS publishes the intraoperative and postoperative percentages for each code in the MPFS. They are updated annually, so check the current year’s figures in the fee schedule rather than relying on a fixed number.

1. The ED physician applies a sling, documents the fracture care, and performs no manipulation. Bills: 23600-54.
2. The orthopedic surgeon receives the transfer note, confirms care responsibility in writing, and schedules the first follow-up visit. Bills: 23600-55, starting on the date care is assumed.
3. Both claims reference the same date of service for the original fracture treatment, so the payer can link the two. Keep a written transfer of care agreement in both records.

A missing written transfer agreement is a frequent audit finding in split-care cases. A referral note alone isn’t enough. The record needs confirmation that the receiving provider accepted responsibility for postoperative management.

Medicare reimbursement for CPT 23600

The 2026 Medicare Physician Fee Schedule gives CPT code 23600 a work RVU of 2.93 and a total non-facility RVU of 11.41. At the CY2026 conversion factor of $33.4009, that comes to about $381 nationally before GPCI adjustment. Verify current figures in the CMS MPFS search tool for your year and locality.

Commercial payer rates differ from Medicare and are governed by your individual contracts. The FastRVU lookup tool gives a quick cross-check of work RVU values and estimated reimbursement before contract negotiations. Geographic Practice Cost Indices (GPCIs) then adjust the final payment by location. That’s why a rural orthopedic practice in Mississippi receives a different amount than one in Manhattan for the same code.

Documentation requirements for CPT 23600

Every CPT code 23600 claim needs a medical record that establishes medical necessity and confirms the procedure performed. A missing or vague note is one of the most common denial triggers for this code.

• Imaging report: X-ray (or CT) confirming the proximal humeral fracture, with the fracture site (surgical neck or anatomical neck) and laterality.
• Clinical rationale for conservative management: documentation that alignment is acceptable without reduction, or that patient factors (age, bone quality, comorbidities) support non-operative treatment.
• Explicit statement that no manipulation was performed: the note must state this directly. “Sling applied” alone is insufficient, so the provider must note that no reduction was attempted or required.
• Treatment plan: the immobilization method (sling, shoulder immobilizer, or coaptation splint), weight-bearing restrictions, and follow-up instructions.
• Provider credentials: the treating provider’s NPI, specialty, and degree must appear on the claim and in the record.
• Patient encounter details: date of service, place of service, and the encounter type (initial, subsequent, or sequela) that determines the ICD-10 suffix.

The phrase “without manipulation” needs to be explicit in the note. Payers running post-payment audits look for this language because 23605 reimburses at a higher rate and the upcode risk is well understood.

Common denial reasons for CPT 23600

Claims for CPT code 23600 are denied for a predictable set of reasons. Each one adds a correction and resubmission cycle, so catching them before submission saves time. When a claim does come back, the payer’s claim denial codes tell you which of these triggered it.

• Wrong anatomical site in ICD-10: the radiology report says “right shoulder” but the diagnosis code specifies the left humerus. Payers cross-reference laterality.
• Wrong encounter suffix: using suffix D (subsequent encounter) on the first visit when the fracture was first treated, instead of suffix A (initial encounter).
• Bundled E/M without a modifier: billing an E/M code on the same date as 23600 without modifier 25. CMS NCCI edits bundle the E/M unless a modifier separates it. A denial management routine that tracks NCCI edits stops this pattern from repeating.
• Code mismatch (23605 billed without documented manipulation): the operative note describes a sling application with no reduction, but the claim shows 23605. Audit risk is significant.
• Missing “without manipulation” language: the note documents the visit but never explicitly states that no manipulation was performed. Payers treat the ambiguity as a documentation deficiency and deny pending records.
• Pre-authorization not obtained: some commercial payers require prior authorization for fracture care codes. Check payer-specific requirements before the procedure.

Billing CPT 23600 with an E/M service

A same-day E/M with CPT 23600 is billable only when it addresses a significant, separately identifiable problem unrelated to the fracture. Modifier 25 on the E/M code signals this to the payer. Without modifier 25, the E/M is bundled into the fracture care code under NCCI edits.

Document the separate problem clearly in its own section of the note. If the only reason for the E/M is the fracture evaluation leading to 23600, the E/M is not separately billable. Payer interpretation of “significant and separately identifiable” varies, so check individual LCD or payer policy before billing both codes routinely.

How Pabau supports clean claims for CPT 23600

The denials above usually start with a mismatch between the note and the claim. Think of a missing “without manipulation” statement, the wrong laterality, or a follow-up visit billed inside the global window. Many practices still catch these by rereading the chart against the claim form before it goes out.

In Pabau, the clinical notes, forms, and uploaded documents for a fracture visit sit on the same patient record. The coder reviews the documentation in one place before billing. Its simpler claims management then helps you submit and track claims through the Claim.MD clearinghouse.

Code choice, modifiers, and the global-period calendar stay with your coder. What changes is that each claim’s status stays visible after submission, so a rejected 23600 claim gets corrected while the details are fresh. Our Claim.MD clearinghouse guide explains how that routing works.

Streamline fracture billing with Pabau

Pabau keeps fracture-care notes and documents on the patient record and helps you submit and track claims through the Claim.MD clearinghouse. Your billing team spends less time chasing claim status.

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Conclusion

For CPT 23600, picking the code is rarely the hard part. The claim pays or denies on the note: the fracture site, the laterality, an explicit no-manipulation statement, and the right ICD-10 suffix.

So build those four elements into your ED or clinic note template instead of checking them claim by claim. The trade-off is a slightly longer note at the first visit, which costs far less than a 90-day bundle billed wrong.

Pabau helps you submit and track claims through the Claim.MD clearinghouse, with the supporting notes on the same patient record. Book a demo to see how it fits your fracture-care billing workflow.

Continue your research

Need to understand how claims reach payers? Medical claims clearinghouse overview explains how 837P files move from practice to payer and where edits are applied.

Want to reduce NCCI denial rates? Denial codes in medical billing covers CARC reason codes and how to address the most common adjudication rejections.

Capturing fracture care on ED superbills? Superbill template gives you a ready-made form for recording CPT and ICD-10 codes at the visit.

Does the payer need prior authorization? Prior authorization process walks through each step so fracture care isn’t denied for a missing approval.

Did the provider reduce the fracture? CPT code 23605 covers closed treatment with manipulation and its documentation rules.

Frequently asked questions