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    v1.0.30
    OpenPayerBilling CodesOther Procedures on the DiaphragmCPT cpt-39599-diaphragm-unlisted-procedure
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    CPT 39599: Unlisted Procedure on the Diaphragm

    CPT code 39599 is an unlisted procedure code used to report surgical procedures performed on the diaphragm when no specific CPT code exists for the procedure; typical service type is surgical procedure on the diaphragm, commonly performed in an operating room or surgical suite for diagnostic or therapeutic interventions involving the diaphragm muscle and surrounding structures.

    For related coverage guidance, see recent payer policy updates: Automated Ambulatory Blood Pressure Monitoring for Diagnosis of Hypertension in Patients with Elevated Office Blood Pressure, Cardiology - Ivabradine, Cardiac Computed Tomography (CCT)/Coronary Computed Tomographic Angiography (CCTA).

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    Table of contents

    Progress1 / 7

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    Clinical & Coding Specifications

    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.

    Related CPT Codes

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

    Related Modifiers

    13 rows

    ModifierDescriptionWhen to Use
    22Modifier –22 (Increased Procedural Services) is used when a reported procedure is substantially more extensive than normally required. The CPT Manual and CMS state it may be appended only when the…- When to use: Append modifier -22 to a procedural CPT code when the service performed is substantially more extensive than the usual service described by that code — i.e., the procedure required…
    50Modifier –50 (Bilateral Procedure) is appended to a CPT code when an identical procedure is performed on paired anatomical structures during the same operative session. The AMA states to add…- Use modifier -50 when the same CPT surgical, diagnostic, or radiology procedure is performed on paired anatomical structures (both sides of the body) during the same operative/session by the same…
    51Modifier –51 (Multiple Procedures) is used when the same provider performs multiple procedures in the same session to identify secondary, non‑exempt procedures and indicate payment reduction logic…- Use modifier -51 when the same provider performs multiple distinct procedures during the same patient encounter: report the highest‑valued procedure first (no modifier) and append -51 to…
    52Modifier ‑52 (Reduced Services) indicates that a service or procedure was partially reduced or omitted at the provider’s discretion, allowing reporting of the basic procedure number with a qualifier…- Use modifier -52 when a physician or qualified health professional electively reduces or omits part of a procedure or service (for example, performing fewer required views or omitting a portion of…
    53Modifier 53 (Discontinued Procedure) signals that a surgical or diagnostic service was begun by the physician but terminated because of extenuating circumstances that threatened the patient’s…- Use modifier -53 when a physician/qualified healthcare professional has started a surgical or diagnostic procedure (e.g., anesthesia administered, incision or scope insertion) and then discontinues…
    54Modifier ‑54 (“Surgical care only”) is appended to a CPT surgical procedure when the reporting surgeon performs the intraoperative (surgical) component but does not furnish the preoperative and/or…- Use modifier -54 when the reporting surgeon provided only the intraoperative (surgical) component of a procedure and preoperative and/or postoperative management has been or will be provided by…
    55Modifier –55 indicates the billing provider furnished only postoperative management for a procedure that has a global surgical period. According to AAPC, this modifier is appended to the same CPT…- Use modifier -55 when billing the same CPT surgical code that has a 10- or 90-day global period and you, as a provider other than the original surgeon, furnished ONLY postoperative management (no…
    56Modifier ‑56 indicates the reporting provider furnished only the preoperative management for a surgical procedure and did not perform the intraoperative or postoperative care. It is used in…- Use Modifier -56 when a provider performs only the preoperative management in a split‑care situation (one physician manages preop care while a different physician performs the intraoperative…
    62Modifier 62 indicates that two surgeons function as co‑surgeons, each performing distinct parts of the same primary surgical procedure. It is appended to the primary procedure code (and any…- Use modifier -62 when two surgeons act as co‑surgeons (both primary surgeons) on a single definitive primary procedure, each performing distinct parts of the same surgical procedure (append -62 to…
    66Modifier 66 (Surgical Team) is used when three or more surgeons act as primary surgeons on a single, highly complex procedure. The AMA defines it for use when a surgical team — often composed of…- Use modifier 66 when three or more surgeons act as primary surgeons working collaboratively as a surgical team on a single, highly complex or difficult procedure (for example organ…

    Showing 1–10 of 13

    Related Provider Taxonomies

    8 rows

    Taxonomy Code
    207L00000X
    2086S0120X
    363L00000X
    363A00000X
    332000000X
    172A00000X
    103TA0400X
    364SC2300X

    Related ICD-10-CM Codes

    19 rows

    ICD-10-CM CodeDescription
    C78.5Secondary malignant neoplasm of large intestine and rectum
    C78.6Secondary malignant neoplasm of retroperitoneum and peritoneum
    C78.7Secondary malignant neoplasm of liver and intrahepatic bile duct
    I85.00Esophageal varices without bleeding
    I85.01Esophageal varices with bleeding
    J80Acute respiratory distress syndrome
    J95.1Acute pulmonary insufficiency following thoracic surgery
    J96.00Acute respiratory failure, unspecified whether with hypoxia or hypercapnia
    J98.4Other disorders of lung
    K44.0Diaphragmatic hernia with obstruction, without gangrene

    Showing 1–10 of 19

    Related Payer Policy Updates

    Specialty: Cardiology1 / 3

    10 rows

    PolicyPayerEffective Date
    Automated Ambulatory Blood Pressure Monitoring for Diagnosis of Hypertension in Patients with Elevated Office Blood PressureBluecross Idaho2026-11-01
    Cardiology - IvabradineCigna2026-10-15
    Cardiac Computed Tomography (CCT)/Coronary Computed Tomographic Angiography (CCTA)univerahealthcare2026-10-15
    Percutaneous Ventricular Assist DeviceUnitedHealthcare2026-10-01
    Cardiovascular Disease Risk AssessmentOscar Health2026-10-01
    Biomarkers for Myocardial Infarction and Chronic Heart FailureOscar Health2026-10-01
    Multiple Procedure Payment Reduction for Diagnostic Cardiovascular ProceduresBlue Cross Blue Shield - Maine2026-10-01
    Left Atrial Appendage Closure Devicesexcellus_health_plan_inc2026-09-17
    Left Atrial Appendage Closure Devicesuniverahealthcare2026-09-17
    Cardiac Omnibus CodesCigna2026-09-15

    Frequently Asked Questions

    References

    1. 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. 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. 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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