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CurrentCurativePolicy CHP-IP-2026-064

Acute Compartment Syndrome

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Medical-necessity criteria for acute inpatient admission, observation, level of care, continued stay, discharge readiness, and related services for Curative commercial members with suspected or confirmed acute compartment syndrome of the extremities; pediatric cases are reviewed with pediatric orthopedic input.

Policy Summary

PayerCurative

PolicyAcute Compartment Syndrome

Policy CodePolicy CHP-IP-2026-064

Change TypeNo material change

Effective DateN/A

Next Review DateN/A

Key ActionSubmit clinical criteria supporting the requested level of care for prior authorization review.

SourceLink

POLICY UPDATE CHANGES

No material clinical or coverage changes in this revision.

All agesApplicable population

≤30 mmHgPerfusion pressure supporting ACS

3–7 daysExpected uncomplicated stay

Every 24 hoursContinued-stay review

1–2 weeksSurgeon follow-up

Medical Necessity and Level-of-Care Criteria

Acute inpatient admission

Acute inpatient admission is medically necessary when ALL of the following are met.

Inpatient admission

Clinical severity finding
- ACS findings in an awake member: Pain out of proportion to injury or increasing analgesic requirement, pain on passive stretch, tense compartment, or paresthesia.
- Pressure abnormality: Perfusion pressure is 30 mmHg or less, or compartment pressure is rising on repeated or continuous measurement.30 mmHg or less
  Perfusion pressure equals diastolic blood pressure minus compartment pressure.

Policy Summary

PayerCurative

PolicyAcute Compartment Syndrome

Policy CodePolicy CHP-IP-2026-064

Change TypeNo material change

Effective DateN/A

Next Review DateN/A

Key ActionSubmit clinical criteria supporting the requested level of care for prior authorization review.

SourceLink

On This Page

High-risk injury: Tibial shaft or forearm fracture, crush injury, high-energy trauma, reperfusion after arterial repair or embolectomy, or circumferential burn requiring serial examination or pressure monitoring.

Unreliable examination: Obtunded, sedated, or neuraxial-anesthesia member with a high-risk injury and no reliable examination.

Rhabdomyolysis or organ involvement: Rhabdomyolysis with CK above 5,000 U/L, myoglobinuria, potassium above 5.5 mEq/L, or acute kidney injury in the setting of limb injury or compression.CK >5,000 U/L; potassium >5.5 mEq/L

Hospital-level service required

Emergent fasciotomy with complete decompression of the involved compartments.
Serial assessment or pressure monitoring: Serial clinical examinations every 1 to 2 hours, or repeated or continuous compartment pressure monitoring.Every 1 to 2 hours
Fracture stabilization: External or internal fracture fixation with fasciotomy.
Rhabdomyolysis treatment: IV fluids and electrolyte monitoring for rhabdomyolysis, or renal replacement therapy.
Staged operative care: Return to the operating room for debridement and staged wound closure or skin grafting.

Observation instead of inpatient

Observation, generally up to 24 hours, is appropriate when ANY of the following applies and no admission criterion is met.

Observation or outpatient instead of inpatient

Lower-risk injury observation: Lower-risk extremity injury with mild swelling, pain controlled on oral analgesics, serial examination required, and perfusion pressure above 30 mmHg if measured.>30 mmHg if measured
Constrictive dressing or cast response: Removal of a constrictive cast or dressing produces prompt symptom resolution and normal examination on reassessment.

Intensive care unit

ICU care is appropriate when ANY of the following is present.

ICU level of care: Rhabdomyolysis with potassium of 6.5 mEq/L or more, ECG changes, or need for continuous renal replacement therapy; OR multiple-compartment or bilateral ACS with hemodynamic instability, sepsis, or polytrauma requiring critical care; OR an obtunded or ventilated member requiring hourly examination and continuous compartment pressure monitoring.Potassium >=6.5 mEq/L; hourly examination

Step-down or intermediate care

Step-down or intermediate care is appropriate when ANY of the following is present.

Step-down or intermediate care: Rhabdomyolysis with potassium 5.5 to 6.4 mEq/L or AKI requiring frequent laboratory checks and cardiac monitoring; OR neurovascular checks every 1 to 2 hours after fasciotomy or revascularization.Potassium 5.5-6.4 mEq/L; checks every 1 to 2 hours

Medical-surgical unit

A medical-surgical unit is appropriate when ANY of the following is present.

Medical-surgical unit: The member is stable after fasciotomy and awaiting second-look debridement or staged closure with neurovascular checks every 4 hours; OR a high-risk injury requires serial examination in an awake, reliable member.Neurovascular checks every 4 hours after fasciotomy

Discharge readiness

Discharge is appropriate when ALL of the following are met.

Wound status: Fasciotomy wounds are closed or grafted, or negative-pressure wound therapy can be managed as an outpatient.
Limb and neurologic status: The limb is perfused without progressive necrosis, and neurologic status is documented and stable or improving.
Laboratory stability: CK is decreasing, potassium is normal, and creatinine is stable or improving for at least 24 hours.At least 24 hours
Pain and mobility: Pain is controlled on oral analgesics, and a mobility and weight-bearing plan is established with therapy.
Follow-up with the treating surgeon is arranged within 1 to 2 weeks and a wound-care plan is in place.1 to 2 weeks

Continued-stay criteria

Continued stay is medically necessary when ANY of the following is documented; review occurs every 24 hours.

Continued stay: Open fasciotomy wounds await planned second-look debridement, delayed primary closure, or skin grafting; or ongoing serial examination or pressure monitoring is required; or rhabdomyolysis has rising or unstable CK, potassium, or creatinine requiring IV therapy; or an associated fracture requires definitive fixation; or wound infection or sepsis requires IV therapy or surgery.Review every 24 hours

Does not meet criteria

The following scenarios do not meet medical-necessity criteria and are referred for physician review.

Does not meet criteria: Fasciotomy for late or missed ACS with established irreversible neuromuscular damage; continued stay after wounds are closed or NPWT is stable for outpatient management and laboratory values are stable while awaiting placement or equipment; or reliance on serum biomarkers alone to decide on fasciotomy in suspected late ACS.

Not denied by an automated system or non-physician reviewer.

This policy applies to acute compartment syndrome (ACS) of the extremities, including traumatic and nontraumatic cases. Abdominal compartment syndrome and chronic exertional compartment syndrome are outside the scope of this policy.

Fasciotomy for late or missed ACS with established irreversible neuromuscular damage does not meet medical-necessity criteria. In this setting, fasciotomy increases infection and amputation risk without functional benefit. Requests are referred for physician review.

A continued stay does not meet acute-care criteria when wounds are closed or negative-pressure wound therapy is stable for outpatient management, laboratory values are stable, and the member is only awaiting placement or equipment. The case should be referred for physician review and discharge planning.

Serum biomarkers alone, including CK or myoglobin, should not be used to decide whether to perform fasciotomy in suspected late ACS. Biomarker results alone are not supported as a decision tool and require physician review when used in this context.

Diagnosis, Procedure, and Utilization Coding

ICD-10-CM: traumatic compartment syndromeICD-10

T79.A0XA	Traumatic compartment syndrome, initial encounter
T79.A11A	Traumatic compartment syndrome, initial encounter
T79.A12A	Traumatic compartment syndrome, initial encounter
T79.A19A	Traumatic compartment syndrome, initial encounter
T79.A21A	Traumatic compartment syndrome, initial encounter
T79.A22A	Traumatic compartment syndrome, initial encounter
T79.A29A	Traumatic compartment syndrome, initial encounter
T79.A3XA	Traumatic compartment syndrome, initial encounter
T79.A9XA	Traumatic compartment syndrome, initial encounter

ICD-10-CM: nontraumatic compartment syndromeICD-10

M79.A11	Nontraumatic compartment syndrome
M79.A12	Nontraumatic compartment syndrome
M79.A19	Nontraumatic compartment syndrome
M79.A21	Nontraumatic compartment syndrome
M79.A22	Nontraumatic compartment syndrome
M79.A29	Nontraumatic compartment syndrome
M79.A3	Nontraumatic compartment syndrome
M79.A9	Nontraumatic compartment syndrome

ICD-10-CM: associated secondary conditionsICD-10

M62.82	Associated condition: rhabdomyolysis
T79.6XXA	Associated condition: traumatic ischemia of muscle

ICD-10-PCS: fasciotomyICD-10

0J8D0ZZ	Fasciotomy: division of subcutaneous tissue and fascia
0J8F0ZZ	Fasciotomy: division of subcutaneous tissue and fascia
0J8G0ZZ	Fasciotomy: division of subcutaneous tissue and fascia
0J8H0ZZ	Fasciotomy: division of subcutaneous tissue and fascia
0J8L0ZZ	Fasciotomy: division of subcutaneous tissue and fascia
0J8M0ZZ	Fasciotomy: division of subcutaneous tissue and fascia
0J8N0ZZ	Fasciotomy: division of subcutaneous tissue and fascia
0J8P0ZZ	Fasciotomy: division of subcutaneous tissue and fascia

MS-DRG FY2027 v44mixed

492	MS-DRG
493	MS-DRG
494	MS-DRG
500	MS-DRG
501	MS-DRG
502	MS-DRG
515	MS-DRG
516	MS-DRG
517	MS-DRG

Revenue codesRevenue

0120	Revenue code
0200	Revenue code
0250	Revenue code
0270	Revenue code
0300	Revenue code
0360	Revenue code
0710	Revenue code

Perfusion pressure

DefinitionDiastolic blood pressure minus intracompartmental pressure.

Supports ACS diagnosis30 mmHg or less.

Helps rule out ACSAbove 30 mmHg on repeated or continuous monitoring.

Rhabdomyolysis CK

ThresholdCK above 5,000 U/L.

Clinical contextRhabdomyolysis in the setting of limb injury or compression supports acute inpatient admission when CK is above 5,000 U/L.

Associated findingsMyoglobinuria, potassium above 5.5 mEq/L, or acute kidney injury may also support inpatient admission.

Potassium thresholds

Inpatient admissionPotassium above 5.5 mEq/L supports inpatient admission in the setting of limb injury or compression.

Step-down or intermediate carePotassium 5.5 to 6.4 mEq/L supports step-down or intermediate care when frequent laboratory checks and cardiac monitoring are required.

ICU carePotassium of 6.5 mEq/L or more supports ICU care, particularly with rhabdomyolysis.

Emergent-treatment red flagPotassium above 6 mEq/L requires emergent treatment and nephrology and ICU evaluation.

Serial examination frequency

Hospital-level admissionSerial clinical examinations every 1 to 2 hours, or repeated or continuous compartment pressure monitoring.

Specified ICU patientsHourly examination is required for obtunded or ventilated members requiring ICU monitoring, with continuous compartment pressure monitoring.

After fasciotomy or revascularizationNeurovascular checks every 1 to 2 hours support step-down or intermediate care.

Expected length of stay

Uncomplicated-course benchmark3 to 7 days.

Primary driversThe expected course is driven by staged wound closure and any associated fracture.

Coverage interpretationThis is a planning benchmark only and is not a limit on covered days.

Continued-stay review interval

Review intervalEvery 24 hours.

Continued-stay basisOngoing serial examination or pressure monitoring, open wounds awaiting planned closure or grafting, or unstable CK, potassium, or creatinine requiring IV therapy may support continued stay.

Extended-stay triggersMultiple debridements, infection, rhabdomyolysis-associated acute kidney injury requiring dialysis, polytrauma, or skin grafting may extend the stay.

Authorization and Documentation Requirements

Prior Authorization

Submit Clinical Criteria for Requested Level of Care

Submit the clinical criteria and supporting medical record for the requested level of care and services. Requests are reviewed for inpatient admission, observation or outpatient management, ICU, step-down, medical-surgical, and related services; include the clinical facts supporting the requested setting and duration.

Identify the requested level of care and service.
Provide findings supporting admission, continued stay, or the requested duration.

Documentation Required

Document Injury and Procedure Timing

Document the mechanism and time of injury, symptom onset, and timing of fasciotomy to establish the clinical timeline for suspected or confirmed acute compartment syndrome.

Include traumatic or nontraumatic mechanism when applicable.
Record the time of injury, symptom onset, and fasciotomy separately.

Documentation Required

Provide Serial Examinations

Provide timed serial neurovascular and compartment examinations throughout the relevant admission or continued-stay period.

Include examination times and interval changes.
Document neurovascular status and compartment findings.

Documentation Required

Document Compartment Pressure Measurements

When compartment pressures are measured, document each pressure together with the simultaneous diastolic blood pressure.

Pair every compartment pressure value with the contemporaneous diastolic blood pressure.
Include the measurement time and anatomic compartment when available.

Documentation Required

Document Operative Findings

Submit operative documentation identifying the compartments released and the viability of the muscle encountered during fasciotomy.

List each compartment released.
Describe muscle viability and other relevant operative findings.

Documentation Required

Submit Rhabdomyolysis and Renal Laboratory Trends

Document trends in CK, potassium, creatinine, and urine myoglobin to support assessment and management of rhabdomyolysis and renal risk.

Provide serial values with dates and times when available.
Include the clinical response and management of abnormal or worsening trends.

Documentation Required

Document Wound and Follow-Up Plan

Document the wound management and follow-up plan, including negative-pressure wound therapy (NPWT), closure or grafting, and follow-up arrangements.

State whether NPWT is continued, stable, or discontinued.
Identify planned closure or grafting and the follow-up provider or setting.

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Denial Risk

Stable Patient Awaiting Placement

A continued stay is not supported when the patient is stable, wounds are closed or NPWT is stable for outpatient management, laboratory values are stable, and the patient is only awaiting placement or equipment. Refer for physician review and discharge planning; do not retroactively deny days already authorized.

Assess whether outpatient wound care, laboratory monitoring, and equipment arrangements are available.
Apply concurrent review to the continued-stay period.

Denial Risk

Biomarkers Alone Do Not Support Fasciotomy

Do not use serum biomarkers alone to decide on fasciotomy in suspected late acute compartment syndrome. CK or myoglobin alone is not a supported decision tool; correlate the decision with the clinical examination, timing, pressure data when available, and operative findings.

CK and myoglobin alone should not determine fasciotomy.
Document the broader clinical basis for the treatment decision.

Billing Rule

Physician Review Required for Adverse Determination

Automated systems and non-physician clinical reviewers may approve a request in full or in part but may not issue an adverse determination. A request that does not meet criteria must be referred to a licensed physician of the same or similar specialty, after offering the requesting provider a peer-to-peer discussion.

Only the reviewing physician may issue an adverse determination.
If only the requested quantity, units, or duration exceed supported documentation, approve the supported portion and review only the unsupported increment.
Days already authorized are not retroactively denied.

Acute Compartment Syndrome Overview

Acute compartment syndrome is a surgical emergency in which increased pressure within a closed fascial compartment compromises perfusion and causes muscle and nerve ischemia. Clinical findings may include pain out of proportion to the injury, increasing analgesic requirements, pain with passive stretch, tense compartments, and paresthesia; pulselessness and paralysis are late findings. Rhabdomyolysis, hyperkalemia, and acute kidney injury may accompany ACS and can affect monitoring, level-of-care, and continued-stay needs.

Clinical Definitions and Benchmarks

Perfusion pressure (delta P)

CalculationPerfusion pressure (delta P) equals diastolic blood pressure minus intracompartmental pressure.

Diagnostic thresholdA value of 30 mmHg or less supports the diagnosis of acute compartment syndrome.

Rule-out interpretationA value above 30 mmHg on repeated or continuous monitoring helps rule out acute compartment syndrome.

Late or missed ACS

DefinitionAcute compartment syndrome presenting with established irreversible muscle and nerve damage, typically after prolonged untreated ischemia.

Fasciotomy implicationFasciotomy is generally not indicated when irreversible damage is established.

Medical-necessity statusFasciotomy for late or missed acute compartment syndrome with established irreversible neuromuscular damage does not meet medical-necessity criteria and is referred for physician review.

Expected length of stay

Planning benchmarkAn uncomplicated course is expected to last 3 to 7 days.

Course driversLength of stay is driven by staged wound closure and any associated fracture.

Coverage interpretationThe benchmark is for planning only and is not a limit on covered days.