CPT code 29824: Distal claviculectomy billing guide

Key takeaways

CPT code 29824 is arthroscopy, shoulder, surgical; distal claviculectomy including distal articular surface, known as the Mumford procedure.

The descriptor contains no acromioplasty, so any source that adds acromioplasty language to 29824 is quoting a code that does not exist.

CPT 29826 is an add-on code, so report it alongside 29824 as a primary and add-on pair. Modifier 59 and modifier XU do not belong on that claim.

NCCI includes limited debridement (29822) in 29824 outright, and allows extensive debridement (29823) only in a different area of the same shoulder.

Practice management software like Pabau keeps CPT and ICD-10 lookup libraries in the billing screen and checks required fields before a claim goes out.

CPT code 29824 covers arthroscopic distal claviculectomy, the shoulder procedure surgeons know as the Mumford. Medicare values it at roughly $639, and it carries a 90-day global period.

One fact settles most of the coding questions around it. CPT 29826 is an add-on code, so it is reported alongside 29824 rather than unbundled from it. Modifier 59 and modifier XU have no place on that claim.

What follows is the descriptor, the modifier set, the NCCI rules, and the diagnosis codes that carry medical necessity.

What CPT 29824 covers, and what it leaves out

CPT code 29824 is the billing code for arthroscopy, shoulder, surgical; distal claviculectomy including distal articular surface.

Surgeons call it the arthroscopic Mumford procedure. It treats acromioclavicular (AC) joint pathology by resecting the distal end of the clavicle and its articular surface. That relieves impingement and pain at the AC joint.

The code sits in the musculoskeletal arthroscopy section of the AMA CPT code set, alongside siblings 29805 through 29828. It is a surgical arthroscopy code, so the diagnostic shoulder arthroscopy (29805) that precedes it is bundled in and never billed separately.

The descriptor, word for word

Full descriptor: Arthroscopy, shoulder, surgical; distal claviculectomy including distal articular surface (Mumford procedure).

What it includes: resection of the distal clavicle and the articular surface at its end. That is the whole descriptor. Acromioplasty is absent from it. CMS quotes the descriptor in full in Chapter 4 of the NCCI Policy Manual, and the phrase “including any acromioplasty” appears nowhere in it. That misquote drives most of the bad advice about this code.

What it excludes: subacromial decompression. That work belongs to a separate code, +29826. Its descriptor reads: decompression of subacromial space with partial acromioplasty, with coracoacromial ligament (ie, arch) release, when performed. A surgeon who decompresses the subacromial space and resects the distal clavicle in one session has performed two reportable services.

When payers accept the procedure as medically necessary

Payers want medical necessity documented before they approve 29824. The operative report has to link the procedure to a diagnosis that justifies arthroscopic distal claviculectomy.

These are the indications carriers accept most consistently:

• Acromioclavicular joint osteoarthritis, primary or post-traumatic, that has failed a documented 6 to 12 weeks of physical therapy or corticosteroid injections
• Distal clavicle osteolysis, often seen in weightlifters and overhead athletes, causing progressive AC joint pain and radiographic evidence of bone resorption
• Symptomatic AC joint impingement confirmed on imaging and clinical examination, with failed non-operative management
• Post-traumatic AC joint degeneration following prior AC joint separation or clavicle fracture
• AC joint hypertrophy causing secondary rotator cuff impingement documented on MRI or ultrasound

Conservative treatment failure belongs in the record before surgery. Most MAC Local Coverage Determinations for shoulder arthroscopy require evidence that non-surgical treatment was tried and did not work.

Leave that out and the claim comes back on medical necessity grounds.

The modifiers that decide how the claim pays

Medical necessity gets the claim considered. Modifier selection settles how much of it survives. 29824 describes a unilateral procedure, so laterality modifiers are required. The code’s fee schedule indicators control which payment modifiers are available to you.

The table below covers the modifiers orthopedic billing teams reach for most often on this code.

The bilateral billing trap: billing 29824 with modifier 50 when only one shoulder was treated is a frequent audit finding. Some facilities apply modifier 50 because the surgical consent covered both shoulders. Both shoulders have to be operated on, on the same date, for modifier 50 to hold. Using RT or LT incorrectly, or leaving them off, causes rejections at the clearinghouse before the claim reaches the payer.

What Medicare pays for 29824 in 2026

Medicare pays 29824 under the Resource-Based Relative Value Scale. The work, practice expense, and malpractice RVUs are each adjusted by the geographic practice cost index, then multiplied by the conversion factor.

CMS finalized two conversion factors for 2026: $33.5675 for qualifying APM participants and $33.4009 for everyone else.

One line on the fee schedule surprises practices. 29824 carries an “NA” indicator in the non-facility column, which means CMS calculates no office-based rate for it. There is a single physician payment, and it is the facility rate.

When the case runs in a hospital outpatient department or an ASC, that facility bills separately for the room, the staff, and the supplies.

Those are national figures before any geographic adjustment, taken from the July 2026 release of the CMS Physician Fee Schedule.

GPCI moves them by several percentage points in either direction depending on locality. Verify against the live CMS tool before you use any rate for contract analysis or fee schedule negotiation.

+29826 changes the math whenever the decompression was performed and documented. It adds 4.42 RVUs, or roughly $147.63 at the nonqualifying APM conversion factor.

Add-on codes carry multiple procedure indicator 0, so that amount escapes the multiple procedure reduction. Treat 29826 as unbillable with 29824 and you leave about $148 behind in every one of those cases.

90 days of follow-up are already paid for

29824 carries a 090-day global period, which makes it major surgery in Medicare’s terms. The payment covers the day before surgery, the procedure itself, and 90 days of routine post-operative care.

CMS splits the code’s work into 0.10 pre-operative, 0.69 intra-operative, and 0.21 post-operative. Those fractions are what the split-care modifiers pay against.

• Modifier 54: surgical care only, used when another physician takes over the follow-up
• Modifier 55: post-operative management only, billed by the physician who provides the follow-up care
• Modifier 56: pre-operative management only
• Modifier 24: an unrelated evaluation and management visit during the 90 days
• Modifier 79: an unrelated procedure during the global period, such as surgery on the other shoulder
• Modifier 78: a return to the operating room for a related complication
• Modifier 58: a staged or more extensive procedure planned at the time of the first surgery

Routine follow-up inside those 90 days is not separately billable. Charging an office visit for a standard six-week check after 29824 is a common overpayment finding.

An auditor spots it in seconds, because the date sits inside the global window. Save modifier 24 for visits that genuinely address a different problem.

What you can bill alongside 29824, and what NCCI blocks

NCCI policy for 29824 turns on two questions. Which companion codes are always included, and which can be reported next to it?

Chapter 4 of the NCCI Policy Manual sets rules for shoulder arthroscopy specifically. They run stricter than the general arthroscopy guidance most coders learn first.

NCCI adds a modifier restriction on top of that edit table. An edit pair of two shoulder arthroscopy codes cannot be bypassed with a modifier when both procedures are on the same shoulder.

Modifier 59 or XU works only across opposite shoulders, or inside the 29823 exception above. Appending 59 to force an ipsilateral pair through is the behavior that draws a post-payment audit.

A worked example: 29824 on a rotator cuff claim

Payment for a multi-code shoulder case follows a second rule. 29824 carries multiple procedure indicator 3, so Medicare applies its special endoscopy policy whenever another code from the 29805 family is on the claim.

The highest-valued procedure pays in full. Each additional one pays at its own value minus the value of the base endoscopy.

Take a case where the surgeon repairs the cuff and resects the distal clavicle. 29827 is the higher-valued line at 29.23 RVUs, so it pays in full. 29824 pays 19.13 minus the 13.44 base endoscopy value, which comes to 5.69 RVUs.

If the subacromial decompression was performed too, +29826 adds its full 4.42 RVUs, untouched by the reduction.

NCCI edit pairs are revised quarterly, so confirm the current table before billing an unusual combination. The AMA’s CPT coding resources cover modifier use for bundled codes. Your MAC’s LCD for shoulder arthroscopy shows any payer-specific reading of the same policy.

The ICD-10 codes that carry medical necessity

Every 29824 claim needs at least one ICD-10 code that establishes medical necessity. Payers check the pairing during automated adjudication, so an unspecified diagnosis raises the denial risk immediately.

When a chart describes pathology the list below misses, work back from the ICD-10-CM code library rather than settling for an unspecified code.

Osteolysis is the one to watch. It is coded in the M89.5 series, not M89.2. A claim built on the wrong series fails a medical necessity review even when the clinical story is right.

Laterality is the other. Payers match the ICD-10 laterality to the modifier on the CPT line. A right-shoulder diagnosis with an LT modifier triggers an automated mismatch denial. Verify crosswalks against the CDC/NCHS ICD-10-CM web tool before you finalize charge capture.

What the operative report has to prove

Thin documentation is the second most common reason 29824 claims fail, after medical necessity. The operative report is the document payers adjudicate surgical claims against.

It has to show that the service was needed and that it was performed as described. It should include:

• Patient diagnosis with clinical findings and the specific AC joint pathology being addressed
• Documentation of conservative treatment failure: what was tried, for how long, and why it was insufficient
• Description of arthroscopic portal placement and the scope of the procedure performed
• Confirmation that the distal clavicle and its articular surface were resected, including the approximate amount of bone removed, typically 5 to 10 mm
• Any subacromial decompression described separately from the clavicle resection, naming the bone removed from the acromion and any coracoacromial ligament release. That is what supports the +29826 line
• For any extensive debridement billed under 29823, the specific area debrided and confirmation that it was a different area from the AC joint work
• Any additional procedures, such as a rotator cuff repair, documented as distinct services
• Post-operative findings and the intraoperative confirmation of AC joint pathology

Pre-authorization paperwork has to match that report. If the authorization named an AC joint procedure and the note describes a different primary procedure, payers deny on the mismatch.

Before you submit: A five-line check

• Laterality agrees across the diagnosis, the modifier, and the operative note
• The bone removal is quantified in millimeters, rather than described as adequate
• +29826 sits on the same claim as its primary code, with no modifier 51 attached
• No 29822 line went out, and any 29823 line names the separate area that was debrided
• The authorization number is on the claim, and the date of service falls inside its window

Why these claims get denied, and how to appeal

29824 claims are denied more often than most orthopedic codes. Three sources of payer scrutiny land on the same procedure: surgical necessity thresholds, bundling policy, and laterality matching.

Knowing the patterns lets a billing team write a faster, more targeted appeal. Strong denial management habits before submission still beat appealing after the fact.

• Medical necessity denial: the most common one. The payer decides conservative treatment was not documented well enough, or that the indication misses the MAC’s LCD criteria. Appeal with office notes, imaging reports, and physical therapy records showing failed non-surgical management.
• Debridement bundling denial: usually 29822 or 29823 billed alongside 29824. Appeal a 29823 denial with an operative report naming the different area of the shoulder that was debrided. A 29822 denial is not worth appealing, because NCCI includes limited debridement in 29824 outright.
• Add-on code denial: +29826 rejected as unbillable. Check that a primary code from 29806 to 29825, 29827, or 29828 sits on the same claim for the same date. An add-on line submitted on its own always denies.
• Laterality mismatch: the ICD-10 laterality does not match the RT or LT modifier on the CPT line. Correct the coding and refile. This is a data error rather than a medical necessity dispute, so a corrected claim resolves it faster than a formal appeal.
• Prior authorization missing or expired: the authorization number was left off the claim, or the date of service fell outside the authorization window. Submit the authorization confirmation with the appeal, or refile with the correct number.
• Place of service mismatch: an office place of service reported for a procedure done at an ASC or hospital outpatient department. Correct the place of service code and refile.

The appeal itself should open with a cover letter citing the exact LCD criteria the claim meets, with page-referenced documentation behind it.

AAPC coding resources and AAOS appeal templates give specialty-specific guidance for the harder cases. Most MACs allow 120 days from the remittance advice date, though the window varies by contractor.

How the sibling shoulder arthroscopy codes differ

29824 belongs to a family of shoulder arthroscopy codes that coders meet together on one operative note.

Knowing how each differs, and whether it can be billed alongside 29824, is what keeps charge capture accurate on a multi-procedure case.

29827 and 29828 turn up in the same session as 29824 often, because rotator cuff and biceps pathology travel with significant AC joint disease.

Both are billable alongside it, and neither needs modifier 51 on a Medicare claim. The special endoscopy rule already determines what the second line pays.

How practice management software keeps 29824 claims clean

Orthopedic and sports medicine practices billing 29824 hit the same operational problems. Charge entry happens away from the note, so laterality gets keyed by hand. Authorization numbers live in a separate inbox, and denial patterns only surface when someone builds a report.

Practice management software like Pabau closes those distances. Pabau pre-fills the claim from the patient record. The diagnosis, the laterality, and the date of service carry across from the visit instead of being retyped.

CPT and ICD-10 lookup libraries sit in the billing screen, so a coder picks M89.511 from a list instead of from memory. Required-field checks hold back a claim that is missing an authorization number or a place of service.

Pabau’s software for orthopedic billing then routes the claim electronically, through clearinghouse connections in the US, the UK, and Australia. In the US that is Claim.MD, which handles CMS-1500 and 837P submission to thousands of US payers, plus eligibility checks and electronic remittance advice.

The bigger win is watching denial patterns across 29824 claims over time rather than working each denial alone. A payer that keeps denying this code on medical necessity is telling you about your documentation protocol, not about one case. Software that surfaces the pattern lets a billing manager fix the cause.

Get orthopedic claims right the first time

Pabau pre-fills the claim from the patient record, keeps CPT and ICD-10 lookup libraries in the billing screen, and checks required fields before submission. Claims then route to payers through clearinghouse connections in the US, the UK, and Australia.

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Conclusion

Two boundaries decide whether a 29824 claim pays. The first is the add-on relationship with 29826, which is a pairing to report rather than an edit to unbundle. The second is NCCI’s debridement policy, which shuts out 29822 completely and allows 29823 only in a different area of the same shoulder.

Both are documentation problems before they are coding problems. The note that names the area debrided, quantifies the bone removed, and describes the decompression separately is the note that survives review. Rewrite the operative template once and the denial pattern on this code changes for good.

If the retyping between the note and the claim is where your 29824 lines go wrong, that is the part worth fixing first. Book a demo to see how Pabau pre-fills a surgical claim and checks it before submission.

Continue your research

Billing the decompression on the same claim? CPT code 29826 covers the add-on’s own rules, from primary-code pairing to the modifier 51 exemption.

Repairing the cuff in the same session? CPT code 29827 explains how the higher-valued line pays and what the operative note has to show.

Working through a stack of denials? Denial codes in medical billing maps the 20 CARC codes that show up most and the fix for each.

Want the claim right the first time? Clean claim requirements lists the elements a surgical claim needs to pass automated edits without rejection.

Checking coverage before the surgery date? Insurance eligibility verification covers how to confirm benefits and authorization windows before the procedure.

Frequently asked questions