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Official Description

Incision and drainage abscess; retropharyngeal or parapharyngeal, intraoral approach

© Copyright 2025 American Medical Association. All rights reserved.

Common Language Description

The CPT® Code 42720 refers to the procedure of incision and drainage of a retropharyngeal or parapharyngeal abscess using an intraoral approach. This procedure is specifically indicated for abscesses located in the deep neck spaces, which can pose significant risks if not addressed promptly. A retropharyngeal abscess is situated behind the pharynx, while a parapharyngeal abscess is found on either side of the pharynx in the lateral spaces. These types of abscesses can arise from various infections and may lead to complications such as airway obstruction or spread of infection if not properly drained. The intraoral approach is typically chosen when the abscess cavity is small and localized, allowing for effective drainage without the need for external incisions. This method is less invasive compared to external approaches, which may be necessary for larger or more complex abscesses. Understanding the anatomical locations and the specific techniques involved in this procedure is crucial for medical coders and healthcare professionals to ensure accurate coding and billing practices.

© Copyright 2025 Coding Ahead. All rights reserved.

1. Indications

The procedure coded as CPT® 42720 is indicated for the following conditions:

  • Retropharyngeal Abscess - This condition involves the accumulation of pus in the retropharyngeal space, which can result from infections that may originate from the tonsils, teeth, or other areas of the head and neck.
  • Parapharyngeal Abscess - This type of abscess occurs in the lateral pharyngeal space and can lead to significant complications if not drained, including airway obstruction and the potential spread of infection.
  • Localized Infection - The procedure is performed when the abscess is small and localized, making an intraoral approach feasible and effective for drainage.

2. Procedure

The procedure for CPT® 42720 involves several key steps to ensure effective drainage of the abscess:

  • Intraoral Access - The surgeon begins by gaining access to the abscess through the oral cavity. This approach is selected when the abscess is small and can be effectively drained without the need for external incisions.
  • Identification of Abscess Cavity - Once access is achieved, the surgeon carefully identifies the area of fluctuance, which indicates the presence of the abscess. This may involve palpation and visual inspection to locate the precise site of the abscess.
  • Incision and Drainage - A small incision is made in the appropriate area of the oral cavity, allowing entry into the abscess cavity. The surgeon then drains the pus, ensuring that the cavity is adequately cleared to prevent further infection.
  • Post-Drainage Care - After the drainage is complete, the area may be irrigated, and appropriate measures are taken to promote healing and prevent complications.

3. Post-Procedure

Following the incision and drainage of a retropharyngeal or parapharyngeal abscess, patients are typically monitored for any signs of complications, such as infection or airway obstruction. Post-procedure care may include pain management, antibiotics to prevent further infection, and instructions for oral hygiene to promote healing. Patients are advised to follow up with their healthcare provider to ensure proper recovery and to address any concerns that may arise during the healing process.

Short Descr DRAINAGE OF THROAT ABSCESS
Medium Descr I&D ABSC RTRPHRNGL/PARAPHARYNGEAL INTRAORAL
Long Descr Incision and drainage abscess; retropharyngeal or parapharyngeal, intraoral approach
Status Code Active Code
Global Days 010 - Minor Procedure
PC/TC Indicator (26, TC) 0 - Physician Service Code
Multiple Procedures (51) 2 - Standard payment adjustment rules for multiple procedures apply.
Bilateral Surgery (50) 0 - 150% payment adjustment for bilateral procedures does NOT apply.
Physician Supervisions 09 - Concept does not apply.
Assistant Surgeon (80, 82) 0 - Payment restriction for assistants at surgery applies to this procedure...
Co-Surgeons (62) 0 - Co-surgeons not permitted for this procedure.
Team Surgery (66) 0 - Team surgeons not permitted for this procedure.
Diagnostic Imaging Family 99 - Concept Does Not Apply
APC Status Indicator Hospital Part B services paid through a comprehensive APC
ASC Payment Indicator Surgical procedure on ASC list in CY 2007; payment based on OPPS relative payment weight.
Type of Service (TOS) 2 - Surgery
Berenson-Eggers TOS (BETOS) P5E - Ambulatory procedures - other
MUE 1
CCS Clinical Classification 33 - Other OR therapeutic procedures on nose, mouth and pharynx
51 Multiple procedures: when multiple procedures, other than e/m services, physical medicine and rehabilitation services or provision of supplies (eg, vaccines), are performed at the same session by the same individual, the primary procedure or service may be reported as listed. the additional procedure(s) or service(s) may be identified by appending modifier 51 to the additional procedure or service code(s). note: this modifier should not be appended to designated "add-on" codes (see appendix d).
58 Staged or related procedure or service by the same physician or other qualified health care professional during the postoperative period: it may be necessary to indicate that the performance of a procedure or service during the postoperative period was: (a) planned or anticipated (staged); (b) more extensive than the original procedure; or (c) for therapy following a surgical procedure. this circumstance may be reported by adding modifier 58 to the staged or related procedure. note: for treatment of a problem that requires a return to the operating/procedure room (eg, unanticipated clinical condition), see modifier 78.
59 Distinct procedural service: under certain circumstances, it may be necessary to indicate that a procedure or service was distinct or independent from other non-e/m services performed on the same day. modifier 59 is used to identify procedures/services, other than e/m services, that are not normally reported together, but are appropriate under the circumstances. documentation must support a different session, different procedure or surgery, different site or organ system, separate incision/excision, separate lesion, or separate injury (or area of injury in extensive injuries) not ordinarily encountered or performed on the same day by the same individual. however, when another already established modifier is appropriate it should be used rather than modifier 59. only if no more descriptive modifier is available, and the use of modifier 59 best explains the circumstances, should modifier 59 be used. note: modifier 59 should not be appended to an e/m service. to report a separate and distinct e/m service with a non-e/m service performed on the same date, see modifier 25.
77 Repeat procedure by another physician or other qualified health care professional: it may be necessary to indicate that a basic procedure or service was repeated by another physician or other qualified health care professional subsequent to the original procedure or service. this circumstance may be reported by adding modifier 77 to the repeated procedure or service. note: this modifier should not be appended to an e/m service.
78 Unplanned return to the operating/procedure room by the same physician or other qualified health care professional following initial procedure for a related procedure during the postoperative period: it may be necessary to indicate that another procedure was performed during the postoperative period of the initial procedure (unplanned procedure following initial procedure). when this procedure is related to the first, and requires the use of an operating/procedure room, it may be reported by adding modifier 78 to the related procedure. (for repeat procedures, see modifier 76.)
79 Unrelated procedure or service by the same physician or other qualified health care professional during the postoperative period: the individual may need to indicate that the performance of a procedure or service during the postoperative period was unrelated to the original procedure. this circumstance may be reported by using modifier 79. (for repeat procedures on the same day, see modifier 76.)
80 Assistant surgeon: surgical assistant services may be identified by adding modifier 80 to the usual procedure number(s).
AS Physician assistant, nurse practitioner, or clinical nurse specialist services for assistant at surgery
GC This service has been performed in part by a resident under the direction of a teaching physician
LT Left side (used to identify procedures performed on the left side of the body)
RT Right side (used to identify procedures performed on the right side of the body)
XS Separate structure, a service that is distinct because it was performed on a separate organ/structure
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