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CPT 20950: Measurement of Interstitial (Compartment) Fluid Pressure

CPT code 20950 defines invasive measurement of interstitial (compartment) fluid pressure to detect compartment syndrome, a time-sensitive condition in which rising tissue pressure can cause ischemia and permanent damage. Nationally, accurate coding for this diagnostic procedure is important for emergency and surgical workflows where rapid diagnosis triggers urgent management. Key payers included in this overview are Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare.

Readers will learn what CPT code 20950 represents clinically and operationally, the typical settings where the service is delivered (emergency department, inpatient hospital, acute care surgical units), and how this code is used in the context of acute musculoskeletal care. The summary highlights common modifiers associated with the code and notes where input data is incomplete. The publication provides benchmarks and policy context relevant to billing and coverage for acute diagnostic procedures, plus clinical background on why timely measurement matters for patient outcomes.

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Billing Code Overview

CPT code 20950 describes the measurement of interstitial (compartment) fluid pressure to evaluate for compartment syndrome, an abnormal accumulation of fluid within a muscle compartment that can compress blood vessels and nerves. The service is a diagnostic invasive measurement performed to detect dangerously elevated tissue pressure after injury, surgery, or repetitive exertion.

Service type: Diagnostic invasive pressure monitoring

Typical site of service: Emergency department, inpatient hospital setting, or acute care surgical unit, where rapid assessment of suspected compartment syndrome is required.

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CPT 20950: Measurement of Interstitial (Compartment) Fluid Pressure

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Sign up for cpt 20950 policy alerts

Get alerted when payer policies referencing 20950 are released or updated.

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Billing Code Overview

Service type: Diagnostic invasive pressure monitoring

Typical site of service: Emergency department, inpatient hospital setting, or acute care surgical unit, where rapid assessment of suspected compartment syndrome is required.

Clinical & Coding Specifications

Clinical Context

A 28-year-old male presents to the emergency department after a tibial shaft fracture sustained in a motorcycle crash. He reports escalating pain, tense swelling of the anterior lower leg, pain with passive stretch of the toes, and paresthesia in the dorsal foot. The trauma team performs an initial clinical assessment including neurovascular exam and plain radiographs, then requests measurement of intracompartmental (interstitial) pressure to confirm or exclude acute compartment syndrome prior to performing an urgent fasciotomy. A trained provider (orthopedic surgeon or emergency medicine physician with procedural competency) prepares sterile equipment, positions the limb at heart level, uses local anesthesia, and inserts a commercially available compartment pressure monitor (needle manometer or slit catheter) into the affected compartment(s). Pressures are recorded and documented, compared with diastolic blood pressure (delta pressure), and used together with clinical findings to guide immediate surgical management.

Coding Specifications

Modifier	Description	When to Use
`26`	Professional component	Use when only the physician component (interpretation or measurement) is billed separate from the facility or technical component.
`50`	Bilateral procedure	Use when measurements are performed on anatomically distinct bilateral compartments during the same encounter.
`51`	Multiple procedures	Use when this procedure is billed alongside other distinct procedures during the same operative session or encounter, if payer requires modifier for multiple procedures.
`52`	Reduced services	Use when the procedure is partially reduced or not completed as documented (e.g., attempted but limited by patient factors).
`53`	Discontinued procedure	Use when the procedure is started but terminated due to unforeseen circumstances.
`59`	Distinct procedural service	Use when this pressure measurement is a distinct service separate from other procedures performed at the same location or on the same day.
`76`	Repeat procedure by same physician	Use when the same provider repeats intracompartmental pressure measurement during the same encounter.
`77`	Repeat procedure by another physician (not in provided list)	Data not available in the input.
`78`	Unplanned return to the operating/procedure room by the same physician following initial procedure for a related procedure during the post-operative period	Use when repeat compartment pressures or fasciotomy occur emergently after an initial procedure in the same postoperative period.
`79`	Unrelated procedure or service by the same physician during the postoperative period	Data not available in the input.
`LT`	Left side	Use to indicate the procedure was performed on the left limb.
`RT`	Right side	Use to indicate the procedure was performed on the right limb.
`HR`	Hemodialysis-related (not in provided list)	Data not available in the input.

Taxonomy Code	Specialty	Notes
207X00000X	Orthopedic Surgery	Orthopedic surgeons commonly perform compartment pressure measurements in trauma and postoperative patients.
208000000X	Emergency Medicine	Emergency physicians perform bedside measurements in acute trauma or suspected compartment syndrome.
207L00000X	Hand Surgery	Hand surgeons may perform measurements for upper extremity compartment syndromes.
372000000X	Vascular Surgery	Vascular surgeons may be involved when ischemia contributes to elevated compartment pressures.
207K00000X	General Surgery	General surgeons may measure compartment pressures in trauma or postoperative abdominal wall/limb cases.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`S82.201A`	Unspecified fracture of shaft of tibia, left leg, initial encounter for closed fracture	Tibial shaft fractures are a common cause of acute compartment syndrome prompting pressure measurement.
`S82.201B`	Unspecified fracture of shaft of tibia, left leg, initial encounter for open fracture	Open tibial fractures increase risk for compartment syndrome; pressure measurement aids decision-making.
`S72.001A`	Fracture of unspecified femur, initial encounter for closed fracture	Femoral fractures with soft tissue injury can lead to elevated compartment pressures in thigh compartments.
`T79.A2XA`	Traumatic compartment syndrome of left lower limb, initial encounter	Direct diagnosis indicating compartment syndrome where pressure measurement confirms severity.
`M79.671`	Pain in right lower leg	Localized severe pain may prompt measurement when compartment syndrome is suspected.
`S46.011A`	Strain of muscle, fascia and tendon of the rotator cuff of right shoulder, initial encounter	Upper extremity soft-tissue injury that can lead to compartment syndrome in uncommon presentations; measurement may be required.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`10160`	Puncture aspiration of abscess, complicated or multiple	May be performed when compartment measurement guides drainage of a localized fluid collection in the limb.
`11042`	Debridement, subcutaneous tissue (including office debridement codes for soft tissue)	Performed when fasciotomy or subsequent debridement is required after confirmed compartment syndrome.
`12001`	Simple repair of superficial wounds of face, ears, eyelids, nose, lips; 2.5 cm or less	Minor wound repairs that may occur after fasciotomy incisions in the emergency or operative setting.
`27502`	Open treatment of tibial shaft fracture, with or without internal fixation	Definitive fracture treatment that may be performed concurrently or after compartment evaluation and fasciotomy.
`27600`	Fasciotomy, leg, single compartment	Definitive surgical treatment when intracompartmental pressure measurements confirm compartment syndrome; may be bilateral or multiple compartments.

CPT 20955: Vascularized Fibula Bone Graft for Major Defect Reconstruction

CPT-20956-VASCULARIZED-ILIAC-CREST-BONE-GRAFT-MICROVASCULAR

CPT 20956: Vascularized Iliac Crest Bone Graft with Microvascular Anastomosis

CPT-20957-VASCULARIZED-METATARSAL-BONE-GRAFT-RECONSTRUCTION

CPT 20957: Vascularized Metatarsal Bone Graft for Major Defect

CPT-20962-VASCULARIZED-BONE-GRAFT-MAJOR-DEFECT

CPT 20962: Vascularized Bone Graft for Major Bone Defect

CPT-20969-VASCULARIZED-BONE-GRAFT-WITH-CUTANEOUS-FLAP

CPT 20969: Vascularized Bone Graft with Cutaneous Flap

CPT-20970-VASCULARIZED-ILIAC-CREST-BONE-AND-CUTANEOUS-GRAFT

CPT 20970: Vascularized Iliac Crest Bone Graft with Cutaneous Tissue

CPT-20972-METATARSAL-VASCULARIZED-BONE-GRAFT-WITH-CUTANEOUS-FLAP

CPT 20972: Vascularized Metatarsal Bone Graft with Cutaneous Flap

CPT-20973-GREAT-TOE-VASCULARIZED-BONE-AND-CUTANEOUS-GRAFT

CPT 20973: Great Toe Vascularized Bone Graft with Cutaneous Component

CPT-20974-ELECTRICAL-BONE-GROWTH-STIMULATION-DEVICE-PLACEMENT

CPT 20974: Implantation of Electrical Bone Growth Stimulation Device

CPT-20975-ELECTRICAL-BONE-GROWTH-STIMULATION-IMPLANT

CPT 20975: Surgical Implantation of Electrical Bone Growth Stimulator

Showing 1–10 of 15

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.

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Clinical & Coding Specifications

Clinical Context

Coding Specifications

Modifier	Description	When to Use
`26`	Professional component	Use when only the physician component (interpretation or measurement) is billed separate from the facility or technical component.
`50`	Bilateral procedure	Use when measurements are performed on anatomically distinct bilateral compartments during the same encounter.
`51`	Multiple procedures	Use when this procedure is billed alongside other distinct procedures during the same operative session or encounter, if payer requires modifier for multiple procedures.
`52`	Reduced services	Use when the procedure is partially reduced or not completed as documented (e.g., attempted but limited by patient factors).
`53`	Discontinued procedure	Use when the procedure is started but terminated due to unforeseen circumstances.
`59`	Distinct procedural service	Use when this pressure measurement is a distinct service separate from other procedures performed at the same location or on the same day.
`76`	Repeat procedure by same physician	Use when the same provider repeats intracompartmental pressure measurement during the same encounter.
`77`	Repeat procedure by another physician (not in provided list)	Data not available in the input.
`78`	Unplanned return to the operating/procedure room by the same physician following initial procedure for a related procedure during the post-operative period	Use when repeat compartment pressures or fasciotomy occur emergently after an initial procedure in the same postoperative period.
`79`	Unrelated procedure or service by the same physician during the postoperative period	Data not available in the input.
`LT`	Left side	Use to indicate the procedure was performed on the left limb.
`RT`	Right side	Use to indicate the procedure was performed on the right limb.
`HR`	Hemodialysis-related (not in provided list)	Data not available in the input.

Taxonomy Code	Specialty	Notes
207X00000X	Orthopedic Surgery	Orthopedic surgeons commonly perform compartment pressure measurements in trauma and postoperative patients.
208000000X	Emergency Medicine	Emergency physicians perform bedside measurements in acute trauma or suspected compartment syndrome.
207L00000X	Hand Surgery	Hand surgeons may perform measurements for upper extremity compartment syndromes.
372000000X	Vascular Surgery	Vascular surgeons may be involved when ischemia contributes to elevated compartment pressures.
207K00000X	General Surgery	General surgeons may measure compartment pressures in trauma or postoperative abdominal wall/limb cases.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`S82.201A`	Unspecified fracture of shaft of tibia, left leg, initial encounter for closed fracture	Tibial shaft fractures are a common cause of acute compartment syndrome prompting pressure measurement.
`S82.201B`	Unspecified fracture of shaft of tibia, left leg, initial encounter for open fracture	Open tibial fractures increase risk for compartment syndrome; pressure measurement aids decision-making.
`S72.001A`	Fracture of unspecified femur, initial encounter for closed fracture	Femoral fractures with soft tissue injury can lead to elevated compartment pressures in thigh compartments.
`T79.A2XA`	Traumatic compartment syndrome of left lower limb, initial encounter	Direct diagnosis indicating compartment syndrome where pressure measurement confirms severity.
`M79.671`	Pain in right lower leg	Localized severe pain may prompt measurement when compartment syndrome is suspected.
`S46.011A`	Strain of muscle, fascia and tendon of the rotator cuff of right shoulder, initial encounter	Upper extremity soft-tissue injury that can lead to compartment syndrome in uncommon presentations; measurement may be required.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`10160`	Puncture aspiration of abscess, complicated or multiple	May be performed when compartment measurement guides drainage of a localized fluid collection in the limb.
`11042`	Debridement, subcutaneous tissue (including office debridement codes for soft tissue)	Performed when fasciotomy or subsequent debridement is required after confirmed compartment syndrome.
`12001`	Simple repair of superficial wounds of face, ears, eyelids, nose, lips; 2.5 cm or less	Minor wound repairs that may occur after fasciotomy incisions in the emergency or operative setting.
`27502`	Open treatment of tibial shaft fracture, with or without internal fixation	Definitive fracture treatment that may be performed concurrently or after compartment evaluation and fasciotomy.
`27600`	Fasciotomy, leg, single compartment	Definitive surgical treatment when intracompartmental pressure measurements confirm compartment syndrome; may be bilateral or multiple compartments.

CPT 20955: Vascularized Fibula Bone Graft for Major Defect Reconstruction

CPT-20956-VASCULARIZED-ILIAC-CREST-BONE-GRAFT-MICROVASCULAR

CPT 20956: Vascularized Iliac Crest Bone Graft with Microvascular Anastomosis

CPT-20957-VASCULARIZED-METATARSAL-BONE-GRAFT-RECONSTRUCTION

CPT 20957: Vascularized Metatarsal Bone Graft for Major Defect

CPT-20962-VASCULARIZED-BONE-GRAFT-MAJOR-DEFECT

CPT 20962: Vascularized Bone Graft for Major Bone Defect

CPT-20969-VASCULARIZED-BONE-GRAFT-WITH-CUTANEOUS-FLAP

CPT 20969: Vascularized Bone Graft with Cutaneous Flap

CPT-20970-VASCULARIZED-ILIAC-CREST-BONE-AND-CUTANEOUS-GRAFT

CPT 20970: Vascularized Iliac Crest Bone Graft with Cutaneous Tissue

CPT-20972-METATARSAL-VASCULARIZED-BONE-GRAFT-WITH-CUTANEOUS-FLAP

CPT 20972: Vascularized Metatarsal Bone Graft with Cutaneous Flap

CPT-20973-GREAT-TOE-VASCULARIZED-BONE-AND-CUTANEOUS-GRAFT

CPT 20973: Great Toe Vascularized Bone Graft with Cutaneous Component

CPT-20974-ELECTRICAL-BONE-GROWTH-STIMULATION-DEVICE-PLACEMENT

CPT 20974: Implantation of Electrical Bone Growth Stimulation Device

CPT-20975-ELECTRICAL-BONE-GROWTH-STIMULATION-IMPLANT

CPT 20975: Surgical Implantation of Electrical Bone Growth Stimulator

Showing 1–10 of 15

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.

Published by

Trek Health powers OpenPayer with a leading commercial payer intelligence platform, seamlessly converting fragmented payer data into actionable insights for provider organizations.

OpenPayer

CPT 20950: Measurement of Interstitial (Compartment) Fluid Pressure

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Billing Code Overview

OpenPayer

CPT 20950: Measurement of Interstitial (Compartment) Fluid Pressure

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Billing Code Overview

Clinical & Coding Specifications

Clinical Context

Coding Specifications

Related Diagnoses

Related CPT Codes

Related Codes

References

Clinical & Coding Specifications

Clinical Context

Coding Specifications

Related Diagnoses

Related CPT Codes

Related Codes

References