A podiatry practice asked us to look at a Medicare prepayment review that had been running for four months. Every debridement claim was being pulled, and roughly a third were downcoded from 11042 to 97597 or denied outright. The physician was frustrated because the debridements were real and the patients were diabetic. When we read the notes, the problem was obvious in the first five: each one said "wound debrided" and gave the wound size, but none said what tissue was removed or how much of the wound was actually debrided.
That gap is the whole story of wound care and debridement coding. The codes are not chosen by the diagnosis, the wound size or the time spent. They are chosen by two facts that must be in the note: the deepest tissue the clinician removed, and the surface area of tissue debrided, in square centimeters. A note that records neither cannot support anything above the lowest code, and a reviewer is not allowed to assume.
This article covers the two code families a physician practice uses for debridement, 97597 and 97598 for selective debridement and 11042 to 11047 for debridement by depth, the rules for adding surface area across wounds, the documentation that survives review, and a worked example with three wounds at two depths.
Key takeaways
- Debridement codes are selected by the deepest tissue removed (skin, subcutaneous tissue, muscle or fascia, bone), not by how deep the wound is.
- Selective debridement limited to the skin level (slough, fibrin, biofilm, devitalized epidermis and dermis) is 97597 for the first 20 sq cm and 97598 for each additional 20 sq cm; 11042 begins only when subcutaneous tissue is removed.
- Surface area is the area of tissue debrided, not the wound area, and wounds debrided to the same depth are added together before choosing units.
- Wounds debrided to different depths are coded separately, with modifier 59 or XS on the lesser code, and the note must describe each wound on its own.
- Non-selective debridement (wet-to-dry dressings, enzymatic agents) is 97602 and is bundled by Medicare; it is not a path to 11042.
The two code families and what separates them
Debridement means removing devitalized (dead or nonviable) tissue, foreign material or debris from a wound to promote healing. CPT splits it two ways. The 97597 and 97598 codes describe selective debridement: the clinician uses scissors, scalpel, forceps or a high-pressure waterjet to remove specific nonviable tissue, and the code includes topical applications, wound assessment, whirlpool if used, and instructions for ongoing care. These codes are used when the debridement does not go below the dermis, which covers most fibrin, slough and biofilm removal in a chronic ulcer.
The 11042 to 11047 series describes surgical debridement by depth. 11042 is debridement of subcutaneous tissue (including epidermis and dermis, if performed), first 20 sq cm or less, and 11045 is the add-on for each additional 20 sq cm or part thereof. 11043 and 11046 are the same pair for muscle and fascia. 11044 and 11047 are the pair for bone. The parenthetical "if performed" matters: the code covers everything above the deepest layer, so you never report 97597 for the skin portion of a wound that also had subcutaneous tissue removed.
| Deepest tissue removed | First 20 sq cm or less | Each additional 20 sq cm or part | Typical situation |
|---|---|---|---|
| Epidermis and dermis only (selective) | 97597 | 97598 | Slough and fibrin removed from a venous ulcer with a curette |
| Subcutaneous tissue | 11042 | 11045 | Necrotic fat excised from a diabetic foot ulcer |
| Muscle and/or fascia | 11043 | 11046 | Devitalized fascia sharply excised from a heel ulcer |
| Bone | 11044 | 11047 | Nonviable cortical bone removed from an exposed metatarsal head |
| Non-selective (any depth) | 97602 | Per session, no add-on | Wet-to-dry dressing change, enzymatic debridement |
Two other codes get confused with this family. 11000 and 11001 are for extensive eczematous or infected skin, measured in percent of body surface, not square centimeters, and they are not wound debridement. 11004 to 11006 are for necrotizing soft tissue infections and belong in an operating room. Neither should appear on a routine wound care claim.
Depth is what you removed, not how deep the wound is
This is the rule that generates the most downcoding. A diabetic foot ulcer can extend to bone and still be correctly coded 97597 if today's debridement removed only slough from the surface. Conversely, a shallow-looking ulcer coded 11042 needs a sentence saying that necrotic subcutaneous tissue was excised. Reviewers read for verbs and nouns: "sharply excised nonviable subcutaneous fat to bleeding, viable tissue" supports 11042; "cleaned wound bed of slough with curette" supports 97597 no matter how the wound was staged.
The diagnosis code has to agree with the picture but does not decide the CPT. A pressure ulcer is L89 with site and stage; a diabetic foot ulcer is E11.621 followed by an L97 code with laterality and a sixth character for severity (1 for breakdown of skin, 2 for fat layer exposed, 3 for necrosis of muscle, 4 for necrosis of bone, 5 for muscle involvement without necrosis, 6 for bone involvement without necrosis). When the L97 severity says "fat layer exposed" and the CPT says 11044, a reviewer will ask how bone was debrided from a wound the diagnosis says stops at fat. Consistency between the two is a cheap way to stay out of review.
Surface area: measure the debridement, then add
The unit of measure for both families is total surface area of tissue debrided, in square centimeters. It is not the wound area. If a 6 by 5 cm ulcer (30 sq cm) had slough removed from a 3 by 2 cm portion of the bed, the debrided area is 6 sq cm and the code is 97597 with no add-on. Record both: the wound measurement for the healing trend, and the debrided area for the code.
When several wounds are debrided to the same depth in one session, add their debrided areas together before selecting units. Three venous ulcers debrided at skin level measuring 8, 12 and 9 sq cm total 29 sq cm: 97597 for the first 20 and 97598 for the remaining 9 (part of an additional 20). A total of 41 sq cm is the base code plus two add-on units. Payers apply the same arithmetic to the 11042 family, and Medicare's medically unlikely edits cap the add-on units per day, so a claim with 97598 x 6 will be questioned regardless of the note.
When wounds are debrided to different depths, they are coded separately and are not added to each other. A heel ulcer debrided to fascia (11043) and a toe ulcer debrided to subcutaneous tissue (11042) go on the claim as two lines, the 11042 with modifier 59 or the more specific XS (separate structure), and the note must describe each wound with its own location, measurements, tissue removed and post-debridement appearance. Without the per-wound detail, NCCI bundles 11042 into 11043 and the modifier looks like an attempt to unbundle.
A worked example with three wounds
A 68-year-old patient with type 2 diabetes presents for scheduled wound care. Wound 1, right plantar forefoot ulcer, 3 by 2 cm: necrotic subcutaneous tissue is sharply excised over the full 6 sq cm to viable fat. Wound 2, right heel ulcer, 4 by 3 cm: devitalized fascia is excised over 12 sq cm; no muscle is removed. Wound 3, left lateral leg venous ulcer, 5 by 4 cm: slough and fibrin are removed with a curette over the entire 20 sq cm, dermis intact. Hemostasis with pressure, dressings applied, offloading reviewed.
Wound 2 is the deepest and is coded 11043 (fascia, first 20 sq cm). Wound 1 is a different depth and a different wound, so it is 11042-XS. Wound 3 is skin-level selective debridement: 97597-XS, and at exactly 20 sq cm no 97598 is due. On the diagnosis side, wounds 1 and 2 carry E11.621 with an L97 code for the right foot whose sixth character reflects the tissue exposed (fat layer for the forefoot, and the heel code that matches what the note describes), and wound 3 carries the venous ulcer diagnosis with its own L97 code for the left lower leg. The point is that each sixth character should agree with what the debridement note says was there.
What would this look like done wrong? The old note said "three wounds debrided, total 38 sq cm" and billed 11043 plus 11046. That adds a skin-level wound and a subcutaneous wound into a fascia code, overstates the fascia debridement by 26 sq cm, and hands a reviewer an easy overpayment finding. The corrected claim pays less per unit on two of the lines and survives.
What the note has to contain
Every wound care note we help a practice template contains the same fields per wound, because the Medicare Administrative Contractors' wound care local coverage determinations ask for them and commercial reviewers borrow the same list: anatomic location with laterality; wound measurements (length, width, depth in centimeters) before debridement; description of the wound bed (granulation, slough, eschar, exposed structures) and periwound skin; the debridement method and instruments; the type of tissue removed and the deepest level reached; the surface area debrided; bleeding and hemostasis; anesthesia if any; the dressing applied; and the plan, including offloading, compression or vascular referral. A photograph is helpful but is not a substitute for the words.
Frequency draws attention too. Chronic wounds are typically debrided no more often than weekly, and a series of identical notes every week for six months with no change in measurements is a pattern MACs data-mine. If a wound is not progressing, the note should say what changed in the plan. If the practice is billing an E/M with the debridement, modifier 25 on the visit requires a problem beyond the wound being debrided, such as new neuropathic pain, a medication change or a suspected infection needing culture and antibiotics.
Ownership matters as well. In a physician office, 97597 and 11042 to 11047 are physician or NPP services. If a nurse performs the debridement, the incident-to rules apply for Medicare and many payers will not pay 11042 at all for a nurse's work. If a physical therapist performs selective debridement under a therapy plan of care, 97597 is reported with the GP modifier and therapy rules. A billing team that does not know who performed the debridement cannot bill it correctly, which is why our billing intake form asks.
Questions we hear
The wound goes down to bone. Can we bill 11044 every visit?
Only for visits where nonviable bone was actually removed, and the note says so. A wound with exposed bone that receives skin-level cleaning is 97597 that day. Repeated 11044 without an operative-style description of the bone removed is one of the most common overpayment findings in this area.
Can we bill 97597 and 11042 on the same wound?
No. The deeper code includes the shallower layers of the same wound. The pairing is legitimate only for different wounds debrided to different depths, with modifier 59 or XS and a separate description of each wound.
How do we count surface area when only part of the wound was debrided?
Measure the debrided portion and document it separately from the wound size. If a 30 sq cm ulcer had 8 sq cm of slough removed, the code is 97597 alone and the note should read "debrided area 8 sq cm." Coding the full 30 sq cm would add a 97598 unit that was not earned. Our coding courses use this exact example because it is where most students get it wrong.
What to do this week
- Pull the last 60 days of claims with 97597, 97598 or 11042 to 11047 and match ten of them against the note for the two facts: deepest tissue removed and area debrided.
- Rebuild the wound care template so each wound has its own block with location, measurements, tissue removed, depth reached and debrided area as required fields.
- Check that L97 sixth characters and L89 stages in your problem list agree with what the debridement notes describe.
- Review any 11044 or 11043 claims in the last year for a description of the bone or fascia removed; correct and refund where the note does not support the depth.
- Confirm who performs debridement in your office and how each person's services are billed to Medicare, then bring the question to your next RCM audit if the answer is unclear.
