Debridement Coding: 11000–11012, 11042–11047, 97597–97598

Debridement is the removal of dead, damaged, infected or necrotic tissue so a wound can heal. The physician may use a scalpel, scissors, curette or other instruments. For coding, the first question is always what was debrided, because CPT splits debridement into four families, and each family is measured differently.

Extensive infected skin

11000 · 11001

Measured by % of total body surface area

Necrotizing soft tissue infection

11004–11006 · 11008

Measured by site (genitalia, perineum, abdominal wall)

Open fracture or dislocation

11010 · 11011 · 11012

Measured by depth, per site

Wounds, ulcers, injuries, infection

11042–11047 · 97597 · 97598

Measured by depth and square centimeters

Part 1 of 5

Extensive eczematous or infected skin: 11000–11001

These codes are for debridement of extensive eczematous or infected skin. They're measured by the percentage of total body surface area (TBSA), not by body region.

Code	Description	Notes
`11000`	Debridement of extensive eczematous or infected skin; up to 10% of body surface	Initial code
`+11001`	Each additional 10% of body surface, or part thereof	Add-on; list with 11000

Add up all areas. Hand 10% and leg 12% is one total: 22% TBSA.
"Or part thereof" means any amount left over gets one more add-on unit, even 1%.
The physician must state the percentage. Don't estimate it from a description; query if it's missing.

Example: 22% TBSA = 11000 (first 10%) + 11001 × 2 (next 10%, then the remaining 2%).

Necrotizing soft tissue infection: 11004–11008

Necrotizing soft tissue infection is a rapidly spreading, life-threatening infection that can involve skin, subcutaneous tissue, fascia and muscle. CPT has codes for specific sites only, and they are not measured by size or depth.

Code	Description	Notes
`11004`	External genitalia and perineum
`11005`	Abdominal wall, with or without fascial closure
`11006`	External genitalia, perineum and abdominal wall
`+11008`	Removal of prosthetic material or mesh, abdominal wall, for infection	Add-on; with 10180 or 11004–11006

Use 11006 when all three areas are debrided in the same session. Don't report 11004 + 11005 together.
11008 is an add-on, so it is always billed with a listed primary code and never alone. Example: infected hernia mesh removed, then abdominal wall necrotizing infection debrided = 11005 + 11008.
These codes are only for necrotizing soft tissue infection. A routine wound infection is coded with 11042–11047 by depth and area.

Done: Extensive skin and necrotizing infection

Part 2 of 5

Open fracture or open dislocation: 11010–11012

In an open fracture the broken bone breaks through the skin and is exposed to the outside. These codes cover debridement, including removal of foreign material, at the site of an open fracture or dislocation. They're measured by depth, per site.

Code	Description
`11010`	Skin and subcutaneous tissue
`11011`	Skin, subcutaneous tissue, muscle fascia and muscle
`11012`	Skin, subcutaneous tissue, muscle fascia, muscle and bone

The rules:

Same site: code only the deepest level. Bone-level debridement is 11012 alone; the skin and muscle work above it is included.
Different sites: code each site. An open tibia fracture debrided to bone plus an open metatarsal fracture debrided to muscle = 11012 + 11011.
"Skin and subcutaneous tissue" in 11010 means both layers. If only skin was debrided, 11010 doesn't fit; see 97597–97598 in the next part.

NCCI and MUE checks

PTP edits: 11011 and 11010 are column 2 codes to 11012. When the sites are different, report the column 2 code with 59 or the more specific XS (separate structure). If the debridement was at the same site, the edit stands: report only the deepest code.
MUEs: check the units limit and its MAI. With MAI 3, a MAC can pay units above the limit when the record shows they were medically necessary (often on appeal). It isn't automatic.

Done: Open fracture debridement

Part 3 of 5

Depth decides the code family

For open wounds, ulcers, injuries and infections, code by the deepest tissue removed, then by square centimeters.

Depth	First 20 sq cm or less	Each additional 20 sq cm or part thereof
`Epidermis/dermis only`	97597	+97598
`Subcutaneous tissue`	11042	+11045
`Muscle and/or fascia`	11043	+11046
`Bone`	11044	+11047

Each deeper code includes the levels above it (11044 includes skin, subcutaneous tissue and muscle for the same wound).

Working out square centimeters: multiply length by width. 5 cm × 5 cm = 25 sq cm; 4 cm × 4 cm = 16 sq cm.

The three rules for multiple wounds

Situation	What to do
One wound, debrided through several layers	Code the deepest level only
Separate wounds at the same depth	Add the areas together and code once for that depth
Separate wounds at different depths	Don't add areas across depths. Code each depth with its own total

This follows the CPT instruction to sum the surface area of wounds at the same depth, but not to combine sums from different depths.

The most expensive mistake: coding only the deepest level when the deeper and shallower debridements were on different wounds on the same leg. That loses revenue the physician earned.

NCCI, 59 and XS

When you report more than one code, check the NCCI PTP table:

Edit with modifier indicator 1: a modifier may bypass it, but only if the column 2 code really was a separate wound (separate site, lesion or structure). Use XS or 59 on the column 2 code.
Modifier indicator 0: no modifier bypasses it.
No edit: no modifier is needed. Don't add 59 "just in case."

Medicare accepts 59 but encourages the more specific XE/XP/XS/XU modifiers (XS = separate structure). Many commercial payers still want 59. Use one or the other, never both, and follow the payer's instructions.

Repeating an add-on code: CPT reports extra add-on units as units (11045 × 2). Some payers want separate lines, sometimes with 59/XS, to avoid duplicate-line denials. Follow the payer's instructions.

What isn't billed separately

Local anesthesia given by the surgeon is part of the procedure (NCCI Policy Manual, ch. III).
Debridement before a skin graft or tissue transfer at the same site is included in the graft or transfer code.
Debridement needed to complete a lesion removal or a repair is included in that procedure.

Done: Wounds and ulcers: 11042–11047, 97597–97598

References

[1]Medicare NCCI Policy Manual 2026, Chapter III: Surgery: Integumentary System (CPT 10000-19999) · CMS · Anesthesia; lesion removal §E; grafts and tissue transfer (debridement included)
[2]Medicare NCCI Policy Manual 2026, Chapter I: General Correct Coding Policies · CMS · Modifier 59 and XE/XP/XS/XU; PTP modifier indicators
[3]Medicare Claims Processing Manual, Chapter 12: Physicians/Nonphysician Practitioners (Rev. 13753, 05-07-26) · CMS · §40.1 (global surgical package; ZZZ add-on codes); §40.6 (multiple surgeries)
[4]CPT Professional codebook: Surgery/Integumentary System guidelines · American Medical Association · Integumentary guidelines: debridement (sum same-depth areas)

CPT® codes and descriptions are copyright American Medical Association. Medicare rules can differ from CPT and from other payers; check the payer's policy.

Wound Debridement