CPT 21925 Deep Soft-Tissue Biopsy Reimbursement | OpenPayer

Summary & Overview

CPT 21925: Deep Soft-Tissue Biopsy of Back or Flank

CPT code 21925 represents a surgical biopsy of deep soft tissue in the back or flank performed to obtain a tissue specimen for pathological evaluation, most commonly to assess for malignancy or other abnormal cellular processes. The code captures a targeted diagnostic surgical procedure distinct from superficial or needle biopsies owing to depth and anatomical location. Nationwide, this procedure is an important diagnostic tool influencing treatment planning for suspected deep-seated masses.

Key payers addressed in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of clinical context, typical sites of service, and common billing considerations. The publication also covers national benchmarks where available, typical billing patterns, and policy updates relevant to coding and coverage for deep soft-tissue biopsy procedures.

This summary is intended for providers, billing professionals, and policy analysts seeking a clear, national-level reference on the clinical and administrative implications of CPT code 21925. Data not available in the input is identified explicitly in the relevant sections that follow.

AetnaBlue Cross Blue ShieldCigna HealthUnitedHealthcareMedicare21925CPTbiopsysoft-tissuediagnostic-proceduresurgical-biopsyoncology-diagnosticsoutpatient-surgery

Billing Code Overview

CPT code 21925 describes a biopsy of deep soft tissue in the back or flank to obtain a tissue sample from a suspicious mass felt in deeper tissues. The procedure yields a specimen submitted for pathological analysis to evaluate for abnormal cells, including malignancy.

Service Type: Surgical biopsy / diagnostic procedure

Typical Site of Service: Hospital outpatient department or ambulatory surgery center; may also occur in an outpatient clinic setting equipped for minor surgical procedures

Clinical & Coding Specifications

Clinical Context

A 58-year-old patient presents with a firm, deep-seated palpable mass in the posterior flank/back region noted on clinical exam and reported progressive enlargement. Imaging with ultrasound or MRI localizes a suspicious intramuscular or deep subcutaneous lesion measuring 2.5 cm with concerning features for neoplasm. The interventional surgeon or orthopedic/plastic surgeon schedules a deep soft tissue biopsy to obtain diagnostic tissue. In the pre-procedure workflow, informed consent is obtained, targeted imaging localization and marking are performed (ultrasound or CT guidance as indicated), and appropriate labs/coagulation studies are reviewed. Intra-procedure steps include sterile preparation of the back/flank, local anesthesia or conscious sedation as appropriate, image guidance if needed, and obtaining core or excisional deep tissue samples sent in formalin to pathology. Post-procedure care includes hemostasis, wound dressing, monitoring for bleeding or infection, and pathology result follow-up to guide oncologic management if malignancy is identified. Typical sites of service are an outpatient procedure suite, hospital minor procedure room, ambulatory surgery center, or interventional radiology suite. The service type is a diagnostic invasive procedure (deep soft tissue biopsy) to obtain tissue for histopathologic analysis.

Coding Specifications

Modifier	Description	When to Use
`11`	Normal, additional procedural service	When this code is the primary procedure and performed without unusual circumstances.

CPT 21935: Extensive Excision of Soft Tissue Malignant Tumor, Back or Flank (<5 cm)

CPT-21933-SUBFASCIAL-SOFT-TISSUE-TUMOR-EXCISION-BACK-FLANK-5CM-PLUS

CPT 21933: Subfascial Soft Tissue Tumor Excision, Back or Flank (≥5 cm)

CPT-21932-SUBFASCIAL-SOFT-TISSUE-TUMOR-EXCISION-BACK-FLANK

CPT 21932: Subfascial Soft Tissue Tumor Excision, Back or Flank

CPT-21920-SUPERFICIAL-SOFT-TISSUE-BIOPSY-BACK-FLANK

CPT 21920: Superficial Soft Tissue Biopsy, Back or Flank

CPT-21931-SOFT-TISSUE-EXCISION-BACK-FLANK-3CM-OR-GREATER

CPT 21931: Excision of Soft-Tissue Tumor Back or Flank, 3 cm or Greater

CPT-21930-SOFT-TISSUE-MASS-EXCISION-BACK-FLANK-LESS-THAN-3CM

CPT 21930: Excision of Soft-Tissue Mass <3 cm, Back or Flank

CPT-21936-EXTENSIVE-EXCISION-SOFT-TISSUE-SARCOMA-BACK-FLANK-5CM

CPT 21936: Extensive Excision of Soft Tissue Malignant Tumor, Back/Flank

Taxonomy Code	Specialty	Notes
208000000X	General Surgery	General surgeons commonly perform deep soft tissue biopsies of the back/flank.
208600000X	Orthopedic Surgery	Orthopedic surgeons perform biopsies for suspected soft tissue sarcomas involving musculature.
207Q00000X	Interventional Radiology	Interventional radiologists perform image-guided core biopsies of deep lesions.
207P00000X	Plastic Surgery	Plastic surgeons perform biopsies when reconstruction or complex closure may be required.
207K00000X	Surgical Oncology	Surgical oncologists perform biopsies as part of cancer diagnosis and staging.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`M79.1`	Myalgia	May be listed when a focal deep soft tissue mass is initially characterized as muscle pain prior to definitive diagnosis.
`M60.9`	Myositis, unspecified	Relevant when biopsy is performed to evaluate inflammatory muscle disease vs neoplasm.
`D48.1`	Neoplasm of uncertain behavior of connective and other soft tissue	Used when a suspicious soft tissue mass requires tissue diagnosis to determine benign vs malignant behavior.
`C49.A9`	Malignant neoplasm of other connective and soft tissue of unspecified site	Used when biopsy confirms or is performed to evaluate suspected soft tissue malignancy.
`R22.1`	Localized swelling, mass and lump, trunk	Common presenting symptom prompting deep tissue biopsy in the back/flank region.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`20526`	Needle core biopsy, soft tissue of back or flank; percutaneous	May be used when a percutaneous image-guided core needle biopsy is performed instead of an open deep tissue biopsy.
`20220`	Biopsy, muscle, single or multiple, open; superficial	Used for superficial muscle biopsy; contrasts with `21925` which is deep soft tissue biopsy.
`11042`	Debridement; skin, subcutaneous tissue and fascia	May be performed if extensive debridement or excision of surrounding infected/necrotic tissue is required during the same session.
`88305`	Level IV surgical pathology, gross and microscopic examination	Typical pathology CPT for tissue specimens submitted from a biopsy for histopathologic evaluation.
`76942`	Ultrasound guidance for needle placement (e.g., biopsy, aspiration, injection)	Used when ultrasound guidance is required to localize and sample the deep lesion during the biopsy.

(Note: Related CPT codes selected as commonly performed before, during, or after a deep soft tissue biopsy to support localization, specimen processing, or adjunct surgical care.)

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