Fasciotomy of the leg with excision of necrotic or damaged tissue from at least one posterior compartment.

Verified May 8, 2026 · 5 sources ↓

Medicare: $587.52
Work RVU: 7.7
Global, days: 90
Region: Foot & ankle

Drawn from CMSFastrvuAAPCAAOS

Documentation requirements

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

Source · Editorial brief grounded in 5 cited references ↓

Specific compartment(s) released — identify posterior, deep posterior, anterior, or lateral by name; notes that say 'lower leg fasciotomy' without compartment detail invite downcoding to 27892
Intraoperative or pre-operative compartment pressure measurements, or clinical findings documenting compartment syndrome (tenseness, pain out of proportion, paresthesias, pallor)
Description of tissue debridement — extent, character of excised tissue (necrotic, non-viable), and estimated volume or surface area removed to justify 27893 over 27892
Indication — acute traumatic compartment syndrome, post-ischemic, or chronic exertional — with supporting clinical history and failed conservative care if chronic
Operative note confirming the surgical approach, incision location(s), wound management (open vs. closed), and plan for staged closure if applicable

Applicable modifiers

Modifiers commonly billed with this code.

Source · AMA CPT modifier descriptors · CMS NCCI Policy Manual

22 Increased complexity 51 Multiple procedures 52 Reduced services 58 Staged or related 59 Distinct service 78 Unplanned return — related 79 Unrelated during global LT Left side RT Right side 80 Assistant surgeon AS PA/NP/CNS assistant

What this code covers

Source · Editorial summary grounded in 5 cited references ↓

CPT 27893 covers a fasciotomy of the posterior leg compartment(s) that includes debridement — the surgeon opens the investing fascia and removes non-viable tissue. It sits in the 27892–27894 family: 27892 is fasciotomy without debridement, 27893 adds debridement, and 27894 covers multiple compartments. Choose among them based on exactly which compartments were released and whether debridement was performed.

Acute compartment syndrome of the leg is the most common indication. Compartment pressures documented in the operative or pre-op note, combined with the clinical presentation (pain out of proportion, tense compartment, paresthesias), anchor the medical necessity argument. Chronic exertional compartment syndrome is a less common but payable indication — expect closer scrutiny and require conservative-treatment failure documentation before approval.

The 90-day global period governs all post-op care. Wound checks, dressing changes, and secondary closure or skin grafting performed as planned staged procedures require modifier 58. An unplanned return to the OR for a related complication — such as re-debridement of persistent necrosis — takes modifier 78. Unrelated procedures during the global require modifier 79.

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 (7.7) is the surgeon's own effort — the figure physician pay and productivity targets are built on. The total RVU (17.59) adds practice overhead and malpractice, and is what drives the Medicare payment below.

Work RVU	7.7
Practice expense RVU	8.25
Malpractice RVU	1.64
Total RVU	17.59
Medicare national rate	$587.52
Global period	90 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	$587.52
HOPD (APC 5114) Hospital outpatient department	$7,413.38
ASC (PI J8) Ambulatory surgical center (freestanding)	$4,682.29

Common denial reasons

The recurring reasons claims for CPT 27893 get rejected.

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

Upcoding flag when debridement is not documented: payers will reduce 27893 to 27892 if the operative note lacks explicit description of tissue removal
Medical necessity denial for chronic exertional compartment syndrome without documented failure of conservative management (activity modification, physical therapy)
Missing compartment pressure data or insufficient clinical narrative to support emergency fasciotomy — particularly on commercial pre-auth reviews
Bundling conflict when debridement or wound management codes are billed separately on the same day without modifier 59 or XS to establish a distinct service
Global period violation when post-op wound care or re-debridement is billed without modifier 78 or 58 to distinguish it from the included global services

Frequently asked questions

Source · Generated from the editorial pipeline, verified against 5 cited references ↓

01What's the difference between 27892, 27893, and 27894?

27892 is fasciotomy without debridement. 27893 adds debridement of at least one posterior compartment. 27894 covers multiple compartments — use it when the anterior, lateral, and both posterior compartments are all released. The operative note must identify the compartments by name to support whichever code you bill.

02Can I bill a skin graft or secondary closure during the global period?

Yes, but append modifier 58 — staged or related procedure by the same surgeon during the post-op period. Document intent for staged closure in the original operative note. Modifier 58 resets the global clock and signals a planned return, distinguishing it from an unplanned complication.

03What modifier applies if the patient returns to the OR for re-debridement of persistent necrosis?

Modifier 78 — unplanned return to the OR for a procedure related to the original surgery during the global period. Do not use modifier 79, which is for unrelated procedures. Document why re-debridement was unplanned and how it relates to the original compartment syndrome.

04Is 27893 payable for chronic exertional compartment syndrome?

It can be, but expect medical necessity scrutiny. You need documented compartment pressure testing confirming elevated post-exercise pressures and a clear record of failed conservative treatment — typically activity modification and physical therapy — before surgical authorization is granted.

05Can 27893 and 27894 be billed together on the same leg?

No. 27894 already describes release of multiple compartments including the posterior compartment. Billing 27893 alongside 27894 for the same leg double-counts the posterior compartment work and will be bundled or denied under NCCI.

06How does the site of service affect payment for 27893?

There is a significant differential. Hospital outpatient (HOPD) and ASC facility payments differ from the professional fee — see the site-of-service comparison table on this page. Emergency compartment syndrome cases are almost always inpatient or hospital ED, so the facility component typically flows through the IPPS, not the HOPD APC.

Sources & references

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

Mira AI Scribe

Mira's AI scribe captures compartment identification, pressure measurements or clinical pressure signs, the debridement description (tissue character, volume, and extent), and wound management plan directly from dictation. That specificity prevents the most common downcode — payers pulling 27893 back to 27892 when the note fails to clearly distinguish debridement from simple fasciotomy alone.

See how Mira captures CPT 27893 documentation