The short version
- Repair is coded three ways by technique, not size: simple (single layer), intermediate (layered, or a heavily contaminated single-layer close), and complex (more than layered — scar revision, debridement, extensive undermining).
- Within one classification and one anatomic group, you add the lengths and report a single code for the total; across different classes or groups, they stay separate.
- The anatomic groups are not the same across the three classes — a hand sits with the trunk in simple, with the neck in intermediate, and with the face group in complex.
- Simple closure is bundled into an excision; intermediate and complex are separately payable, with a modifier.
- → Simple, intermediate, complex: it’s technique, not size
- → Add the lengths — but only within the same class and group
- → The anatomic groups shift between simple, intermediate, and complex
- → What closure bundles with an excision, and what pays
- → When the closure becomes a tissue transfer, the repair stops paying→ What the repair note needs before you bill
Simple, intermediate, complex: it’s technique, not size
Repair classification is decided by the closure technique, and coders lose money assuming it tracks wound size. Simple repair is a single-layer closure — primarily epidermis and dermis, no deeper work — and it carries a zero-day global. Intermediate repair closes one or more deeper layers (subcutaneous tissue or superficial fascia) in addition to the skin; a single-layer closure of a heavily contaminated wound that needs extensive cleaning or removal of particulate matter also qualifies as intermediate. Complex repair is more than a layered closure: scar revision, debridement, extensive undermining, retention sutures, or stents — and it starts at 1.1 cm, because a truly complex repair is never trivially small.
So a long laceration closed in one layer is still simple, and a short wound that needed undermining and a scar revision is complex. The note describes the technique; the technique picks the class. Bill a complex code off a layered-closure note and you’ve built an audit target; bill simple when you did the deeper work and you’ve given the pay away.
Add the lengths — but only within the same class and group
When a patient has more than one repair, you don’t automatically bill a code per wound. The rule: add together the lengths of all repairs that share the same classification and the same anatomic group, and report a single code for the combined length. Repairs in a different class, or a different group, are reported separately.
Two intermediate repairs — a 3 cm on the trunk and a 4 cm on the arm — are both in the scalp/axillae/trunk/extremities group, so they sum to 7 cm and bill as one 12032 (2.6–7.5 cm). But a 3 cm intermediate repair on the trunk and a 3 cm intermediate repair on the neck fall in different groups, so they bill as two separate codes. Complex repairs add up the same way, with add-on codes (13102, 13122, 13133, 13153) for each additional 5 cm beyond the base. Get the summing wrong in either direction and the claim either downcodes or invites a bundling denial.
The anatomic groups shift between simple, intermediate, and complex
Here’s the trap that catches experienced coders: the anatomic groupings are not the same across the three classifications. You cannot memorize one map. The hand is the clearest example — in a simple repair it groups with the trunk and extremities (12001–12007); in an intermediate repair it moves to the neck/hands/feet/genitalia group (12041–12047); in a complex repair it sits with the face, cheeks, and mouth group (13131–13133). Same hand, three different code families.
The practical consequence is that you resolve the classification first, then find the group within that classification, then sum and pick the length tier. Jump straight to a code family from memory and you will occasionally land in the wrong one, because the map you’re remembering belongs to a different class.
What closure bundles with an excision, and what pays
Most repair coding rides on top of an excision, and the split is clean. Simple closure is bundled into the excision code and never billed separately. Intermediate and complex repair are separately reportable — and they often out-earn the excision, with complex trunk and extremity repairs running $338 to $418 and a secondary closure (13160) reaching about $741. We walk the excision side in our benign excision coding guide.
The catch is the edit: NCCI pairs intermediate and complex repair with the excision as a column-one/column-two edit, so the closure line needs the appropriate modifier (59, or a specific X{EPSU} modifier) and a note that documents the layered or complex work. Bill the repair bare alongside the excision and it denies as bundled; document it and modifier it correctly and it pays as the distinct service it is. On the smallest excisions, some payers won’t pay layered closure at all, so read the policy first. (The Medical Necessity tool on Billing IQ keeps those policy links by code.)
When the closure becomes a tissue transfer, the repair stops paying
Everything above assumes the closure is a repair code. The moment it becomes a tissue transfer, the rules invert.
Adjacent tissue transfer (14000–14350) includes the excision and the repair. Not one of them. Both. CMS puts it plainly: CPT codes 11400-11646 and 12001-13160 “shall not be reported separately with CPT codes 14000-14350 for the same lesion or injury.” Debridement done to perform the transfer is in there too. So a 14040 on a cheek lesion is the whole claim, and the 11442 and the 12052 you added to it are the lines that deny.
The line between complex repair and tissue transfer is where good notes go wrong. Extensive undermining to get a defect closed is complex repair. Tissue transfer requires that adjacent tissue be incised and carried over to close the defect. Undermining alone doesn’t earn the 14000-series code, and a traumatic laceration that happens to close in a Z-plasty pattern is still a repair — unless the surgeon deliberately designed the transfer.
Then the rule almost nobody codes correctly: the three smallest benign excision codes pay no closure at all. On 11400, 11420 and 11440 — excised diameter 0.5 cm or less — simple, intermediate and complex repairs are all bundled. Do a layered closure on a 0.4 cm lesion and document it beautifully, and it still pays nothing. Remove a second lesion over 0.5 cm in the same session and you can bill the repair against that one.
Two places the closure does pay. Mohs is the exception that pays everything — repairs, grafts and flaps are all separately reportable with 17311–17315. And a skin graft stays separately reportable alongside a repair or a transfer, as long as the graft isn’t already written into the transfer code’s descriptor.
One flap trap worth knowing if you do breast work: 15734, the muscle, myocutaneous or fasciocutaneous flap, is not reportable with breast reconstruction 19357–19369 or with prosthesis codes 19340 and 19342. The flap is already inside those. Breast reconstruction absorbs adjacent tissue transfer the same way, unless the transfer is at an unrelated site.
And the rule that reaches past skin entirely: a repair code cannot be used to close a surgical incision. CMS puts 12001–13153 out of bounds for closing the incision of any procedure carrying a 000, 010, 090 or MMM global, because that closure is already in the global package. So a soft tissue tumor excision from the 2xxxx family takes no repair code at all, however the wound was closed. Debridement in the same surgical field goes the same way.
Check the primary procedure before you code the closure, not after.
What the repair note needs before you bill
A clean repair claim carries four things: the classification (with the technique that supports it — layered closure for intermediate, scar revision or undermining for complex), the anatomic group, the summed length within that class and group, and the modifier when the repair rides with an excision. The op note has to describe the deeper work, because that description is the only thing separating an intermediate from a simple, and a complex from an intermediate.
Bill a complex repair on a note that only describes a layered closure and you’ve overcoded; bill simple when you undermined and revised and you’ve undercoded. Both are fixed in the documentation. If layered and complex closures are denying or downcoding across your schedule, our medical billing team works the classification, the summing, and the modifier logic behind them.
Frequently asked questions
What’s the difference between simple, intermediate, and complex repair?
It’s technique, not size. Simple is a single-layer closure. Intermediate closes one or more deeper layers (subcutaneous or superficial fascia) in addition to the skin, or is a heavily contaminated single-layer closure needing extensive cleaning. Complex is more than a layered closure — scar revision, debridement, extensive undermining, retention sutures, or stents.
How does the repair summing rule work?
Add together the lengths of all repairs that share the same classification and the same anatomic group, and report one code for the combined length. Repairs in a different classification or a different anatomic group are reported separately. Complex repairs use add-on codes for each additional 5 cm.
Are the anatomic groups the same for simple, intermediate, and complex repair?
No, and this is a common error. The groupings differ by classification. A hand groups with the trunk and extremities in simple repair, with the neck/hands/feet/genitalia group in intermediate repair, and with the face/cheeks/mouth group in complex repair. Resolve the classification first, then find the group within it.
Can you bill wound repair separately from an excision?
Simple closure is bundled into the excision and not billed separately. Intermediate (12031–12057) and complex (13100–13160) repair are separately reportable, but NCCI pairs them with the excision, so the closure line needs the appropriate modifier (59 or an X{EPSU} modifier) and documentation of the deeper work.
When is a repair coded as complex?
When it requires more than a layered closure — scar revision, debridement, extensive undermining, retention sutures, or stents. Complex repair codes start at 1.1 cm and are grouped by anatomic region, with add-on codes for each additional 5 cm of length.
This article explains how these codes tend to get paid — it is not coding, billing, or legal advice. Some of the codes here are bundled into the main procedure, or fall into grey areas that vary by payer. Before billing anything in a grey area, confirm it with your own coding and compliance team and the current guidance from your specialty society, Medicare (CMS), and AMA CPT. When in doubt, don’t bill it.
