Rotator Cuff Repair Coding: 23410, 23412, 23420, and 29827 Explained

Shoulder charts are one of those areas where the operative note does a lot of the heavy lifting for you — if you actually read it closely. Rotator cuff repairs get coded wrong more often than they should, usually because someone picks 23410 or 23420 out of habit without checking whether the surgeon actually went in open, mini-open, or all-arthroscopic. Those three approaches aren’t interchangeable, and CPT treats them very differently. Let’s walk through what’s actually happening in these procedures so the code you pick matches what the surgeon really did.

The Codes We’re Covering

• 23410 — Repair of ruptured musculotendinous cuff (e.g., rotator cuff), open; acute
• 23412 — Same repair, but chronic
• 23420 — Reconstruction of complete shoulder (rotator) cuff avulsion, chronic, includes acromioplasty
• 29827 — Arthroscopy, shoulder, surgical; with rotator cuff repair

What You’re Actually Looking At Anatomically

The rotator cuff isn’t one muscle — it’s four: the supraspinatus, infraspinatus, subscapularis, and teres minor, all originating on the scapula and converging into a single tendon that attaches to the head of the humerus. That tendon is what actually tears. Acute tears usually come from a specific traumatic event — falling on an outstretched arm, a hard throwing motion — while chronic tears build up slowly from years of overuse or repetitive strain. That acute/chronic distinction isn’t just clinical color; it’s literally what separates 23410 from 23412, so make sure the note actually states which one you’re dealing with before you code it.

You’ll also see these charts used for related indications like crushing injuries to the shoulder and upper arm, post-traumatic osteoarthritis, spontaneous extensor tendon rupture, rotator cuff capsule sprain, and traumatic arthropathy — not every rotator cuff chart is a straightforward tear.

Three Different Surgical Approaches (And Why It Matters for Coding)

Open repair involves a real incision — typically 6 to 10 cm — with the muscle beneath the skin separated to expose the cuff directly. A partial tear gets sutured; a complete tear is reattached to the bone, sometimes with suture anchors that stay in permanently.

Mini-open repair is a hybrid: a diagnostic arthroscopy is done first, most of the visualization and initial work happens through the scope, and then the actual repair is completed through a small incision — usually just 3 to 4 cm.

Arthroscopic repair is done entirely through several small (roughly 1 cm) poke-hole incisions, with the whole procedure visualized on a monitor. If the tear turns out to be too extensive to manage this way, the surgeon may convert to an open approach mid-procedure — and if that happens, your code selection needs to reflect what was actually completed, not what was originally planned.

This distinction is the whole ballgame for 23410/23412 versus 29827 — the CPT code follows the technique used to complete the repair, not the initial plan going into the OR.

23410 and 23412: Open Repair of a Ruptured Cuff

Here’s roughly what’s happening in the note when you see these codes: a longitudinal incision is made along the front of the shoulder, the deltoid fibers are divided, and the coracoacromial ligament is cut to get to the supraspinatus tendon, which is detached through a transverse incision at the greater tuberosity. The frayed, damaged edges of the tendon are trimmed off. The surgeon then chisels a small trench into the humeral bone and buries the tendon flap into it, securing it with sutures passed through drilled holes in the bone. The repair typically finishes with side-to-side suturing connecting the supraspinatus to the neighboring subscapularis and infraspinatus tendons.

Report 23410 for an acute rupture, and 23412 for a chronic one — same procedure, different timeline of injury. This is a one-word difference in the documentation that changes your code, so don’t assume; look for the actual language the surgeon used.

23420: Reconstruction of a Complete Chronic Avulsion (With Acromioplasty)

This one is reserved for a full, chronic avulsion of the rotator cuff — a step beyond a standard rupture repair. The typical approach is anterior, through an incision over the acromioclavicular joint; if the infraspinatus needs to be shifted, a second posterior incision along the scapular spine is added, sometimes detaching part of the posterior deltoid to get access.

The torn margins are freshened up, a non-absorbable suture closes the longitudinal portion of the tear, and a portion of articular cartilage on the underside of the humeral head is removed so the torn tendon can be brought into direct contact with raw bone. Sutures are passed through drilled holes in the greater tuberosity and tied off.

Here’s the detail that trips people up: 23420 already includes an acromioplasty — the division of the acromioclavicular ligament and burring away of the undersurface of the acromion (and, if the distal acromion is actually removed, that’s an acromionectomy). Because that’s bundled into the code description itself, you wouldn’t separately report an acromioplasty performed alongside 23420 in the same operative session. If a modifier situation comes up around bundled services like this, Modifier -59 Made Easy: Stop Denials & Code with Confidence is a good refresher on when unbundling actually applies versus when it doesn’t.

29827: Arthroscopic Rotator Cuff Repair

The patient’s positioned side-lying with the arm suspended, and the surgeon makes several small percutaneous “poke hole” incisions to get the arthroscopic instruments in, with fluid pumped through one incision to expand the joint for a clearer view. A diagnostic arthroscopy comes first to assess the joint, and a limited bursectomy with subacromial decompression may be performed if the space under the acromion needs to be cleared of soft tissue.

From there, a small percutaneous incision may be added near one of the existing portholes to help with the repair itself. The deltoid is split from its acromion attachment for about 5 cm, the torn tendon edge is debrided and mobilized, and a transverse bony trough (3 to 4 mm) is created with tunnels drilled through to the lateral cortex of the greater tuberosity. The tendon is drawn into the trough with permanent sutures, anchor sutures go in, and everything is tied down — first the anchors, then the sutures running to the bony trough, with the free ends passed through the tunnels and tied over a bony bridge. The longitudinal part of the tear is closed with absorbable suture, a range-of-motion check confirms the repair, and the incisions are closed.

Since this is a scope-based procedure with its own diagnostic component built in, it’s worth comparing against how similar arthroscopic work is coded elsewhere in the body — Arthroscopic Knee Surgery CPT Codes: A Complete Coding Guide walks through a lot of the same logic (diagnostic-vs-therapeutic scope, when a converted-to-open procedure changes your code) applied to a different joint.

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Things Worth Double-Checking Before You Finalize the Code

• Acute or chronic? This single word decides between 23410 and 23412 — don’t guess from context, look for the explicit term.
• Did the surgeon start arthroscopic and convert to open? Code based on what was actually completed, not the original surgical plan.
• Is acromioplasty documented separately alongside 23420? Remember, it’s already bundled into that code — don’t double-report it.
• Is this a straightforward rupture repair, or a full chronic avulsion reconstruction? That distinction is what separates 23410/23412 from 23420, and it’s easy to conflate the two if you’re skimming.
• Was a bursectomy or subacromial decompression also performed during the arthroscopic case? Check whether that’s separately reportable or considered part of the same operative session.
• Are there other shoulder procedures noted in the same session — like a distal clavicle excision or biceps tenodesis — that need their own codes rather than being folded into the rotator cuff repair?

For a broader gut-check on whether you’ve pulled everything reportable out of a surgical note like this one, the Universal Operative Note Coding Checklist (For All Surgical CPT Codes) is worth keeping open alongside the chart. And if you want to see this exact code family applied to a real coded example from start to finish, Sample Coded Report for Rotator Cuff Repair CPT Code walks through one.

This guide is meant as an educational coding reference, not a substitute for the current CPT manual, payer-specific policy, or the complete operative note. Always confirm code selection against those sources before submitting a claim.