CPT 39599 Diaphragm Reimbursement & Policy

CPT code 39599 denotes an unlisted surgical procedure on the diaphragm and is used when no specific CPT code exists for the performed diaphragm operation. Nationally, unlisted procedure codes like 39599 are important because they require clear documentation and often additional claim substantiation to explain the services rendered and justify medical necessity. This code affects billing workflows in both inpatient and outpatient surgical settings where diaphragm procedures are performed.

Key payers typically involved in coverage and payment determinations include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find an overview of clinical context for diaphragm procedures, common billing considerations for using an unlisted CPT code, and what to expect when submitting claims to major payers. The publication also summarizes benchmarking points and policy considerations relevant to unlisted surgical codes, explains documentation expectations, and outlines how payers may handle payment or review for 39599 claims.

This analysis is written for a national audience and provides concise guidance on the role of CPT code 39599 in surgical billing, payer interactions, and administrative processes without referencing state-specific rules.

Billing Code Overview

CPT code 39599 is an unlisted procedure code for operations on the diaphragm. It is used to report procedures involving the diaphragm that do not have a specific CPT code assigned.

Service type: Surgical procedure on the diaphragm

Typical site of service: Operating room or surgical suite (inpatient or outpatient surgical setting)

Data not available in the input.

Clinical Context

A 58-year-old patient presents with progressive dyspnea and chest discomfort after prior thoracic surgery. Imaging (chest CT and fluoroscopy) identifies a focal diaphragmatic defect and adherent tissue requiring a surgical intervention on the diaphragm that does not have a dedicated CPT code. The surgical team—thoracic surgeon with general anesthesia—performs an open repair of an unusual diaphragmatic lesion with resection of scar tissue and primary repair of the diaphragm. The intraoperative documentation details approach, specific diaphragm location, extent of resection, reconstruction method, and any prosthetic material used. The typical workflow includes preoperative evaluation and imaging, informed consent documenting use of an unlisted diaphragm procedure, operative reporting with time, technique, and complications, application of an appropriate unlisted procedure code 39599, and submission of operative note and rationale to payors as required for claims review. Typical site of service is an inpatient or outpatient hospital operating room, and the service type is a surgical procedure on the diaphragm.

Coding Specifications

Modifier	Description	When to Use
`22`	Increased procedural services	Use when the work required is substantially greater than typical and documentation supports increased complexity or time.

Taxonomy Code	Specialty	Notes
2080S0105X	Thoracic Surgery	Primary specialty for operative diaphragm procedures, including complex diaphragmatic repairs.
207L00000X	General Surgery	General surgeons commonly perform diaphragmatic repairs, especially in trauma or abdominal-related defects.
2086S0120X	Cardiothoracic Surgery	Cardiothoracic surgeons perform diaphragm procedures when combined with intrathoracic or cardiac operations.
363L00000X	Physician Assistant	Common procedural support provider; documents assisted services per supervision rules.
363A00000X	Nurse Practitioner	Participates in perioperative management and post-operative care as allowed by institutional policy.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`K44.9`	Diaphragmatic hernia without obstruction or gangrene	Common indication for diaphragmatic procedures when specific hernia coding applies; may overlap with unlisted diaphragm repairs.
`J98.81`	Diaphragmatic dysfunction (e.g., paralysis)	Diaphragm repair or plication may be performed to improve respiratory function in diaphragmatic dysfunction.
`S37.009A`	Unspecified injury of diaphragm, initial encounter	Traumatic diaphragmatic injuries often require surgical repair; if presentation or repair is atypical, `39599` may be used.
`K44.1`	Chronic diaphragmatic hernia	Indicates longer-standing herniation requiring surgical correction; relevant to operative planning.
`R06.02`	Shortness of breath	Symptom code commonly appearing in the clinical presentation leading to diagnostic evaluation and potential diaphragm surgery.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`39599`	Unlisted procedure, diaphragm	Primary code used to report diaphragm procedures without a specific CPT code.
`39320`	Repair of diaphragmatic hernia; adult	Used when a defined diaphragmatic hernia repair is performed and a specific code exists; relevant when distinguishing from unlisted diaphragm procedures.
`39500`	Diaphragmatic plication, thoracotomy	Used when plication is performed for eventration or paralysis; may be performed instead of or in addition to unlisted diaphragm procedures.
`32663`	Thoracoscopy with repair of diaphragmatic defect	Minimally invasive approach code that is applicable when thoracoscopic repair options are used and a specific code applies.
`35800`	Repair of traumatic diaphragmatic rupture	Used when traumatic rupture repair has specific coding; included as related workflow when trauma is the indication.

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Summary & Overview

CPT 39599: Unlisted Procedure on the Diaphragm