CPT 42845 Tonsil/Oropharyngeal Resection Reimbursement | OpenPayer

Summary & Overview

CPT 42845: Tonsil and Oropharyngeal Resection with Chest Flap Reconstruction

CPT code 42845 represents an extensive head and neck oncologic procedure that combines resection of the tonsils, tonsillar pillars, and/or retromolar trigone with possible partial maxillary or mandibular resection and reconstruction using a chest-based skin flap. This procedure is clinically significant for management of malignant lesions in the oropharynx and adjacent oral cavity and carries implications for surgical specialty billing, resource use, and postoperative care pathways across hospitals and surgical centers nationwide. Key payers discussed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise explanation of the procedure and typical settings of care, an overview of common billing modifiers associated with major surgical services, and context on how this code aligns with head and neck oncology service lines. The publication provides benchmarks for utilization and reimbursement patterns where available, notes common payer coverage considerations, and outlines clinical context relevant to coding and billing teams. Data not available in the input is explicitly noted where applicable.

AetnaBlue Cross Blue ShieldCigna HealthUnitedHealthcareMedicareCPT 42845head and neck surgeryoncologic resectionflap reconstructionsurgical billingoropharyngeal surgeryambulatory surgeryhospital inpatient

Billing Code Overview

CPT code 42845 describes a surgical procedure in which the provider removes the tonsils, tonsillar pillars, and/or the retromolar trigone. Portions of the maxilla or mandible may also be resected if affected. The wound is closed using a skin flap rotated from the chest. This operation is most commonly used for resection of cancerous growths in the oropharyngeal and adjacent oral cavity regions.

Service type: Surgical resection with regional flap reconstruction
Typical site of service: Hospital operating room or ambulatory surgery center for major head and neck oncologic surgery

Clinical & Coding Specifications

Clinical Context

A 62-year-old male with a heavy smoking history presents with a progressively enlarging, ulcerative mass of the left tonsillar region confirmed by biopsy as squamous cell carcinoma. Imaging demonstrates tumor extension to the tonsillar pillars and involvement of adjacent retromolar trigone with possible superficial cortical erosion of the mandibular ramus. The multidisciplinary tumor board recommends surgical resection with wide local excision of the tonsil, involved tonsillar pillar and retromolar trigone, marginal mandibulectomy of the affected portion of the mandible, and reconstruction using a pedicled skin flap rotated from the chest to provide soft-tissue coverage and restore contour.

The clinical workflow includes preoperative staging (clinical exam, CT/MRI, and possible PET), anesthesia evaluation, intraoperative tumor resection with frozen section margin assessment, resection of involved bone as indicated, flap harvest from chest and transfer to oral defect, inset and microvascular or pedicled flap monitoring as applicable, and postoperative inpatient monitoring for airway compromise, flap viability, nutrition planning (enteral feeding), pain control, and early speech/swallow therapy. Typical perioperative providers include otolaryngology–head and neck surgery, reconstructive/plastic surgery, anesthesiology, speech-language pathology, and nursing. Typical length of stay ranges from several days to two weeks depending on reconstruction complexity and postoperative course.

Coding Specifications

Modifier	Description	When to Use
`22`

CPT 42826: Tonsillectomy for Patients Age 12 and Older

CPT-42806-NASOPHARYNGEAL-BIOPSY-UNKNOWN-PRIMARY-LESION

CPT 42806: Biopsy of Unknown Primary Lesion of the Nasopharynx

CPT-42830-INITIAL-ADENOIDECTOMY-PEDIATRIC

CPT 42830: Initial Adenoidectomy in Patients Under 12 Years

CPT-42890-PHARYNGEAL-WALL-RESECTION-PARTIAL-THYROID-ALA-HYOID

CPT 42890: Partial Pharyngeal Wall Resection

CPT-42821-TONSILLECTOMY-ADENOIDECTOMY-AGE-12-PLUS

CPT 42821: Tonsillectomy and Adenoidectomy, Age 12 or Older

CPT-42831-INITIAL-ADENOIDECTOMY-AGE-12-OR-OLDER

CPT 42831: Initial Adenoidectomy for Patients Aged 12 Years or Older

CPT-42808-PHARYNGEAL-LESION-DESTRUCTION-LASER-CRYOSURGERY

CPT 42808: Removal or Destruction of Pharyngeal Lesion

CPT-42809-PHARYNX-FOREIGN-BODY-REMOVAL

CPT 42809: Removal of Foreign Body from Pharynx

CPT-42860-TONSILLAR-REMNANT-POLYPECTOMY

CPT 42860: Removal of Tonsillar Remnants and Polyps

CPT-42836-RECURRENT-SECONDARY-ADENOIDECTOMY-12-YEARS-AND-OLDER

CPT 42836: Recurrent or Secondary Adenoidectomy, Age 12 and Older

Showing 1–10 of 22

Taxonomy Code	Specialty	Notes
207YL0001X	Otolaryngology (ENT)	Primary surgeon for oropharyngeal and tonsillar cancer resections.
208W00000X	Plastic and Reconstructive Surgery	Performs flap harvest and reconstructive closure of the defect.
207RH0000X	General Surgery (Head & Neck Surgery)	May be involved for complex resections involving mandible or airway management.
207Q00000X	Oral and Maxillofacial Surgery	Involved when mandibulectomy or bony reconstruction is required.
2084P0800X	Surgical Oncology	May participate in oncologic resections within multidisciplinary teams.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`C09.0`	Malignant neoplasm of tonsillar pillar	Primary malignant disease of the tonsillar pillar requiring resection.
`C09.1`	Malignant neoplasm of tonsillar fossa	Tumor involving the tonsillar fossa often requiring tonsillectomy and local resection.
`C02.4`	Malignant neoplasm of retromolar area	Tumor of the retromolar trigone commonly resected in conjunction with tonsillar lesions.
`C41.2`	Malignant neoplasm of mandible	Mandibular involvement by tumor requiring partial mandibulectomy during the procedure.
`C09.8`	Malignant neoplasm of overlapping sites of tonsil	Tumors spanning multiple tonsillar sites necessitating wider excision.
`C80.1`	Malignant (primary) neoplasm, unspecified	Used when primary site is malignant but not further specified in documentation; less specific coding.
`Z85.8`	Personal history of other malignant neoplasm	Relevant for surveillance, staging considerations, and reconstructive planning if prior cancers exist.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`20926`	Tissue transfer or flap; trunk or extremity, pedicled, includes direct closure of donor site	Used when a pedicled chest skin flap is harvested and transferred for intraoral reconstruction as part of closure.
`21025`	Excision, tumor, soft tissue of cheek or mouth; intra-oral approach	May be used for adjacent soft-tissue tumor excision of the retromolar trigone or oral mucosa if coded separately from `42845`.
`21045`	Excision, tumor, bone, mandible; marginal	Used when partial mandibulectomy or marginal mandibulectomy is performed for tumor involving the mandible in conjunction with `42845`.
`31500`	Intubation, endotracheal, emergency procedure	May be performed preoperatively for airway control in the operating room setting; typically part of anesthesia services.
`99223`	Initial hospital care, typically 70 minutes or more, high severity	Represents typical initial postoperative hospital care for complex surgical inpatients after `42845`.

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