Surgical opening, exploration, and irrigation of infected tissue spaces within the foot, involving multiple wound compartments.

Verified May 8, 2026 · 6 sources ↓

Medicare: $373.42
Work RVU: 5.15
Global, days: 0
Region: Foot & ankle

Drawn from CMSAAPCMdclarity

Documentation requirements

What must appear in the operative or office note to support the claim.

Source · Editorial brief grounded in 6 cited references ↓

Specify that multiple tendon sheaths, deep tissue planes, or fascial compartments were involved — single-space procedures map to 28002, not 28003
Identify the anatomical compartments entered and irrigated, with explicit mention of the extent of infection spread
Document the laterality (left vs. right foot) to support LT/RT modifier usage and ICD-10 laterality coding
Include intraoperative findings: degree of purulence, necrotic tissue present, presence or absence of bone involvement
Record cultures taken and any hardware or foreign material encountered
Confirm medical necessity with pre-op diagnosis including depth and any comorbidities (e.g., diabetes, peripheral vascular disease)

Applicable modifiers

Modifiers commonly billed with this code.

Source · AMA CPT modifier descriptors · CMS NCCI Policy Manual

22 Increased complexity 51 Multiple procedures 58 Staged or related 59 Distinct service 76 Repeat, same physician 77 Repeat, another physician 78 Unplanned return — related 79 Unrelated during global LT Left side RT Right side XS Separate structure

What this code covers

Source · Editorial summary grounded in 6 cited references ↓

CPT 28003 covers surgical incision and drainage of infected foot tissue involving multiple tendon sheaths, deep tissue planes, or fascial spaces — the distinction that separates it from the single-space 28002. This is an operative-level procedure, not a bedside I&D, and it carries a 0-day global period, meaning any post-op E/M visits are separately billable starting the day after surgery.

The code is predominantly used by podiatry, orthopedic surgery, and plastic/reconstructive surgery. Diabetic foot infection is the most common clinical context, making ICD-10 diagnosis specificity — including laterality, depth, and any associated osteomyelitis — a front-line audit trigger. The 0-day global also means that if the infection requires a return trip to the OR within the same episode of care, modifier 78 is required for a related return procedure and modifier 79 for an unrelated one.

Non-facility (office) rates for 28003 are negligible — this procedure is performed in the OR. Watch for NCCI bundling conflicts when debridement codes (e.g., 28120, 28122) are billed on the same date; separate billing requires documentation of distinct anatomical sites or separately identifiable procedures, supported by modifier 59 or XS as appropriate.

RVU & reimbursement

Component RVUs and Medicare national rate. Actual payment varies by GPCI locality.

Source · CMS Physician Fee Schedule, RVU26A · January 2026

Work RVU vs. total RVU

The work RVU (5.15) is the surgeon's own effort — the figure physician pay and productivity targets are built on. The total RVU (11.18) adds practice overhead and malpractice, and is what drives the Medicare payment below.

Work RVU	5.15
Practice expense RVU	5.49
Malpractice RVU	0.54
Total RVU	11.18
Medicare national rate	$373.42
Global period	0 days

Payment by site of service

Medicare pays different rates by setting. HOPD typically pays substantially more than ASC for the same procedure.

Source · CMS OPPS Addendum B·ASC HCPCS payment rates·2026

Setting	Medicare rate (national)
Office (PFS non-facility) Procedure performed in physician's office	$373.42
HOPD (APC 5113) Hospital outpatient department	$3,342.87
ASC (PI A2) Ambulatory surgical center (freestanding)	$1,644.87

Common denial reasons

The recurring reasons claims for CPT 28003 get rejected.

Source · Editorial brief grounded in CMS NCCI edits, AAOS coding appeals, and cited references ↓

Insufficient documentation distinguishing multi-space involvement from single-space I&D (28002), causing downcoding
ICD-10 diagnosis lacks specificity — missing laterality, depth descriptor, or osteomyelitis linkage triggers medical necessity denials
NCCI bundling conflict when debridement codes are billed same-day without modifier 59 or XS and supporting documentation of distinct sites
Missing or incorrect modifier when billed as a return-to-OR procedure during the post-op period of a prior foot surgery
Site-of-service mismatch — procedure billed to office facility type when performed in ASC or hospital OR

Frequently asked questions

Source · Generated from the editorial pipeline, verified against 6 cited references ↓

01What separates 28003 from 28002?

28002 covers incision and drainage of a single deep space or tendon sheath. 28003 requires involvement of multiple tendon sheaths or deep tissue planes. If your operative note documents only one space, payers will downcode to 28002.

02The global period is 0 days — what does that mean practically?

You can bill a separate E/M the day after surgery without a modifier. Any post-op visit on the day of surgery still needs modifier 25 on the E/M if decision for surgery was made that same day. There is no bundling window for routine post-op care beyond the day of service.

03Can 28003 and debridement codes like 28120 or 28122 be billed together?

NCCI bundles these pairs. Separate billing is allowed only when the procedures address distinct anatomical sites with documentation to support it. Add modifier 59 or XS and ensure the operative note explicitly differentiates the sites and work performed.

04Which modifier applies if the patient returns to the OR for re-irrigation of the same infection?

Use modifier 78 — unplanned return to the OR for a complication or continuation of the related procedure during the post-operative period. Modifier 79 is for a completely unrelated procedure and is the wrong choice here.

05Is laterality a billing requirement for 28003?

Yes. Append LT or RT to identify the operative foot. Omitting laterality is a common clean-claim failure, especially with Medicare Advantage and commercial payers who require it for foot procedures.

06When is modifier 22 appropriate with 28003?

Use modifier 22 when the procedure required substantially greater work than typical — for example, extensive necrotic tissue requiring prolonged irrigation across multiple compartments in a patient with severe diabetes and vascular compromise. The operative note must explicitly describe the increased complexity and time.

Sources & references

Editorial content was developed using the following public sources. Last verified May 8, 2026.

Mira Scribe

Mira's AI scribe captures the number and identity of involved compartments (tendon sheaths, fascial spaces), intraoperative extent of infection, laterality, and whether bone was exposed or involved. It flags when documentation only describes a single space — preventing the most common downcode from 28003 to 28002 — and ensures the ICD-10 diagnosis block includes laterality and depth, reducing medical necessity denials before the claim leaves the practice.

See how Mira captures CPT 28003 documentation