CPT Code 58943 Malignancy-Specific Oophorectomy: OBGYN Medical Billing Guide

Complex ovarian, tubal, and primary peritoneal malignancy procedures require meticulous coding, detailed documentation, and accurate reporting to ensure proper reimbursement. CPT 58943 involves not only oophorectomy (partial or total, unilateral or bilateral) but also extensive staging procedures, including lymph node biopsies, peritoneal washings, and optional salpingectomy or omentectomy. Proper coding of this high-complexity procedure is critical for OBGYN medical billing, helping practices capture clinical complexity and optimize claims while maintaining compliance.

Definition and Scope For CPT Code 58943

CPT 58943, as defined by the American Medical Association (AMA) and referenced on AAPC’s Codify platform, is a malignancy-specific oophorectomy involving partial or total removal of one or both ovaries, typically for ovarian, tubal, or primary peritoneal cancer. This high-complexity procedure includes extensive staging components, such as:

• Para-aortic and pelvic lymph node biopsies
• Peritoneal washings and biopsies
• Diaphragmatic assessments
• Optional salpingectomy (fallopian tube removal)
• Optional omentectomy (omentum removal)

The procedure is generally performed via open abdominal approach (laparotomy) and is distinct from standard oophorectomy codes like CPT 58940 or benign ovarian procedures.

Report CPT 58943 when a surgeon performs a laparoscopic combined adnexectomy due to pathology involving both the ovary and fallopian tube. Typical clinical indications include:

• Complex adnexal masses involving both ovary and fallopian tube
• Endometriosis affecting adnexal structures
• Suspected malignancy confined to adnexa
• Adnexal torsion involving both structures

Do not report CPT 58943 when:

• Only the ovary is removed (use CPT 58925)
• Only the fallopian tube is removed (use appropriate salpingectomy code)
• Removal is part of another major laparoscopic surgery without separate clinical indication (e.g., hysterectomy)
• The approach is open (use corresponding open code)

CPT Code 58943 Scenarios

Scenario 1 – Complex Adnexal Mass

A 45‑year‑old patient presents with a complex right adnexal mass involving both the ovary and tube on imaging. Laparoscopic surgery is performed to remove both structures.

→ Report CPT 58943

Scenario 2 – Endometriosis Involving Adnexa

A patient with severe endometriosis affecting the left ovary and fallopian tube undergoes laparoscopic adnexectomy.

→ Report CPT 58943

Scenario 3 – Incidental Removal During Major Procedure

During a laparoscopic hysterectomy for uterine fibroids, the surgeon removes the right ovary and tube without distinct clinical indication.

→ Do NOT report CPT 58943 separately; this is bundled into the primary procedure unless documentation supports it as a separate therapeutic service.

Modifier Considerations Under CPT Code 58943

Modifiers may be applied when appropriate:

• Modifier 59 (Distinct Procedural Service): When the laparoscopic adnexectomy is separate from another procedure during the same session, with supporting documentation.
• Modifier 22 (Increased Procedural Services): When complexity significantly exceeds typical expectations (e.g., extensive adhesions), and operative notes justify the increased work.

Modifier use must be supported by clear documentation of surgical findings and clinical intent.

Documentation Essentials - CPT Code 58943

To support CPT 58943 and medical necessity, documentation should include:

• Clinical indication for adnexal removal
• Laterality (right or left)
• Laparoscopic approach and operative technique
• Pathology or findings involving both the ovary and tube
• Distinction from other concurrent procedures

Clear operative notes strengthen payer review and reimbursement acceptance.

Reimbursement Considerations Under CPT Code 58943

Reimbursement varies by payer, place of service, and laterality. CPT 58943 carries a standard global period and should be paired with appropriate ICD‑10 diagnosis codes reflecting combined adnexal pathology such as complex ovarian masses, torsion, or endometriosis. Preauthorization may be recommended in certain clinical situations.

BillingFreedom: Expert OBGYN Medical Billing for Malignancy-Specific Oophorectomy

CPT 58943 involves complex malignancy-specific oophorectomy procedures with extensive staging, including lymph node biopsies, peritoneal washings, diaphragmatic assessment, and optional salpingectomy or omentectomy. Accurate coding and thorough documentation are critical for proper OBGYN medical billing and reimbursement.

Why Practices Rely on BillingFreedom

BillingFreedom’s specialized team focuses exclusively on OBGYN medical billing, ensuring every CPT 58943 claim:

• Reflects unilateral or bilateral oophorectomy, partial or total
• Captures all staging components performed for malignancy
• Applies modifiers (-22, -59/-XU) correctly for complexity or distinct services

Maximize Revenue & Reduce Denials

• Coding accuracy: 98–99% for complex OBGYN procedures
• First-pass claim acceptance: 97–99%
• Denial rates: consistently under 3%

Comprehensive Support Services

• Preauthorization guidance for malignancy-specific ovarian procedures
• Claims submission, tracking, and denial management
• Updates on AMA CPT changes, NCCI edits, and payer-specific rules
• Detailed operative note review to ensure compliant, accurate reimbursement

Partnering with BillingFreedom allows OBGYN practices to focus on patient care while our team manages complex coding for CPT 58943, maximizing reimbursement and minimizing administrative burden.

For more details about our exceptional medical billing services, please don't hesitate to contact us via email at info@billingfreedom.com or call us at +1 (855) 415-3472. 

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