ICD-10-PCS Code For Lower Extremity Connective Tissue: Procedure Code Group Overview

The International Classification of Diseases, Tenth Revision, Procedure Coding System (ICD-10-PCS) code group BL41 includes procedures performed to image connective tissue structures in the lower extremity using ultrasonography. These ICD-10-PCS codes are used for inpatient documentation when real-time display of anatomy or flow information of lower extremity connective tissue is obtained for diagnostic or procedural guidance. Accurate coding within the ICD-10-PCS BL41 group is essential for proper inpatient reimbursement, as it captures the specific imaging modality and anatomic target which determine case classification and payment.

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Lower Extremity Connective Tissue Ultrasonography Procedure Overview

This procedure group includes real-time ultrasonography examinations of connective tissue in the lower extremities, using reflected and attenuated high-frequency sound waves to generate images or flow information. Procedures target connective tissue structures such as fascia, tendons, and periarticular soft tissues in the leg and foot. Accurate ICD-10-PCS coding is important for inpatient records because it documents the imaging modality and anatomic focus, supporting appropriate case mix assignment and reimbursement.

Code Attributes

Character	ICD-10-PCS Category	Code Group Details
B	Section	Imaging
L	Body System	Connective Tissue
4	Operation	Ultrasonography
1	Body Part	Connective Tissue, Lower Extremity

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ICD-10-PCS Code For Lower Extremity Connective Tissue: Procedure Code Group Overview

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Lower Extremity Connective Tissue Ultrasonography Procedure Overview

Code Attributes

Character	ICD-10-PCS Category	Code Group Details
B	Section	Imaging
L	Body System	Connective Tissue
4	Operation	Ultrasonography
1	Body Part	Connective Tissue, Lower Extremity

When to Use

Use a code from this group when real-time ultrasonography of lower extremity connective tissue is performed during an inpatient encounter for diagnosis or to guide intervention. Select the specific ICD-10-PCS code that reflects the ultrasonography operation and the connective tissue body part of the lower extremity.

ICD-10-PCS Codes

1 rows

ICD-10-PCS Code	Description
BL41ZZZ	Ultrasonography of Lower Extremity Connective Tissue

Typical Clinical Scenarios

An elderly hospitalized patient on anticoagulation develops sudden unilateral calf swelling, pain, and concern for deep vein thrombosis after prolonged immobilization; the inpatient team requests point-of-care real-time ultrasonography focused on the calf tendons and surrounding connective tissues to evaluate for hematoma, soft-tissue injury, or compressive lesions contributing to swelling. Typical codes: BL41ZZZ
A middle-aged diabetic patient admitted for a foot ulcer with cellulitis and worsening localized pain; treating clinicians perform bedside ultrasonography of the foot and ankle connective tissues to assess tendon integrity, detect abscess formation in periarticular soft tissues, and guide incision or debridement planning. Typical codes: BL41ZZZ
A young athlete admitted after an acute inversion ankle injury with persistent mechanical symptoms and suspected partial tendon tear despite prior outpatient care; inpatient real-time ultrasonography of lower extremity connective tissue is performed to characterize tendon pathology and assist surgical decision-making during the admission. Typical codes: BL41ZZZ

Related Codes

BL40-UPPER-EXTREMITY-ULTRASONOGRAPHY

ICD-10-PCS Code For Upper Extremity: Procedure Code Group Overview

BL42-UPPER-EXTREMITY-ULTRASONOGRAPHY

ICD-10-PCS Code For Upper Extremity Tendons: Procedure Code Group Overview

BL43-LOWER-EXTREMITY-TENDONS-ULTRASONOGRAPHY

ICD-10-PCS Code For Lower Extremity Tendons: Procedure Code Group Overview

Frequently Asked Questions

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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When to Use

ICD-10-PCS Codes

1 rows

ICD-10-PCS Code	Description
BL41ZZZ	Ultrasonography of Lower Extremity Connective Tissue

Typical Clinical Scenarios

An elderly hospitalized patient on anticoagulation develops sudden unilateral calf swelling, pain, and concern for deep vein thrombosis after prolonged immobilization; the inpatient team requests point-of-care real-time ultrasonography focused on the calf tendons and surrounding connective tissues to evaluate for hematoma, soft-tissue injury, or compressive lesions contributing to swelling. Typical codes: BL41ZZZ
A middle-aged diabetic patient admitted for a foot ulcer with cellulitis and worsening localized pain; treating clinicians perform bedside ultrasonography of the foot and ankle connective tissues to assess tendon integrity, detect abscess formation in periarticular soft tissues, and guide incision or debridement planning. Typical codes: BL41ZZZ
A young athlete admitted after an acute inversion ankle injury with persistent mechanical symptoms and suspected partial tendon tear despite prior outpatient care; inpatient real-time ultrasonography of lower extremity connective tissue is performed to characterize tendon pathology and assist surgical decision-making during the admission. Typical codes: BL41ZZZ

Related Codes

BL40-UPPER-EXTREMITY-ULTRASONOGRAPHY

ICD-10-PCS Code For Upper Extremity: Procedure Code Group Overview

BL42-UPPER-EXTREMITY-ULTRASONOGRAPHY

ICD-10-PCS Code For Upper Extremity Tendons: Procedure Code Group Overview

BL43-LOWER-EXTREMITY-TENDONS-ULTRASONOGRAPHY

ICD-10-PCS Code For Lower Extremity Tendons: Procedure Code Group Overview

Frequently Asked Questions

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.

ICD-10-PCS Code For Lower Extremity Connective Tissue: Procedure Code Group Overview

Sign up for ICD-10-PCS Code For Lower Extremity Connective Tissue: Procedure Code Group Overview policy alerts

Lower Extremity Connective Tissue Ultrasonography Procedure Overview

Code Attributes

ICD-10-PCS Code For Lower Extremity Connective Tissue: Procedure Code Group Overview

Sign up for ICD-10-PCS Code For Lower Extremity Connective Tissue: Procedure Code Group Overview policy alerts

Lower Extremity Connective Tissue Ultrasonography Procedure Overview

Code Attributes

When to Use

ICD-10-PCS Codes

Typical Clinical Scenarios

Related Codes

What procedures are included in ICD-10-PCS code group `BL41`?

What is the section, body system, operation, and body part for `BL41ZZZ`?

When should `BL41ZZZ` be used in inpatient documentation?

How does accurate coding of `BL41` affect reimbursement?

What connective tissue structures are targeted by the lower extremity ultrasonography in `BL41`?

References

When to Use

ICD-10-PCS Codes

Typical Clinical Scenarios

Related Codes

What procedures are included in ICD-10-PCS code group `BL41`?

What is the section, body system, operation, and body part for `BL41ZZZ`?

When should `BL41ZZZ` be used in inpatient documentation?

How does accurate coding of `BL41` affect reimbursement?

What connective tissue structures are targeted by the lower extremity ultrasonography in `BL41`?

References