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    v1.0.30
    OpenPayerBilling CodesOther Procedures on the Pharynx, Adenoids, and TonsilsCPT cpt-42999-unlisted-pharynx-adenoids-tonsils-procedure
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    CPT 42999: Unlisted Procedure on Pharynx, Adenoids, or Tonsils

    CPT code 42999 is an unlisted procedure code for operations on the pharynx, adenoids, or tonsils used to report procedures not described by other CPT codes (for example, removal of a Thornwaldt/Tornwaldt cyst); the service type is surgical procedure on the pharynx/adenoids/tonsils and the typical site of service is an operating room or ambulatory surgical center where detailed documentation and preauthorization are required and a clear description of the service must be included with the claim.

    For related coverage guidance, see recent payer policy updates: Office-based Laryngeal Procedures, Otoacoustic Emissions Testing (for Oxford Only), Hearing Aids and Devices Including Wearable, Bone-Anchored, and Semi-Implantable (for Indiana Only).

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    Table of contents

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    Clinical & Coding Specifications

    Clinical Context

    A 42-year-old patient presents to the otolaryngology clinic with persistent posterior nasal obstruction, intermittent nasal discharge, and episodes of nasopharyngeal pain. Nasal endoscopy identifies a Thornwaldt (Tornwaldt) cyst in the posterior nasopharynx causing intermittent infection and symptomatic blockage. After failed conservative management including antibiotics and saline irrigations, the surgeon schedules a transnasal endoscopic excision of the Thornwaldt cyst under general anesthesia. Preauthorization is obtained for the unlisted pharynx procedure. On the day of service the patient undergoes endoscopic visualization, cyst marsupialization and complete removal with hemostasis, documented in the operative report. Specimens (if any) are sent for pathology. The clinical workflow includes preoperative evaluation and anesthesia assessment, intraoperative documentation specifying techniques and instruments used, and a postoperative note describing findings and discharge instructions. The claim for 42999 includes a narrative description of the procedure and is accompanied by relevant diagnosis codes, operative report, and preauthorization information for payer review.

    Related CPT Codes

    CPT CodeDescriptionRelationship to This Procedure
    31231Nasal/sinus endoscopy, diagnostic, unilateral or bilateral (separate procedure)Diagnostic endoscopy often performed prior to or during excision for visualization.
    30140Excision or destruction of lingual tonsil, any methodRelated pharyngeal soft-tissue excision procedures in the oropharynx.
    42820Tonsillectomy and adenoidectomy; combinedCommon adjacent pharyngeal procedures in patients with obstructive or infectious indications.
    31620Bronchoscopy, flexible, transnasal or transoral; with diagnostic collectionMay be used when airway assessment or distal inspection is required in complex cases.
    88305Level IV surgical pathology, gross and microscopic examinationCommonly reported when tissue from the excised lesion is submitted for histopathology.

    Related Modifiers

    11 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…
    26Modifier 26 (Professional Component) identifies and bills only the professional portion of a split service — the physician’s interpretation, report, and medical judgment — when the technical…- Use CPT Modifier -26 when you are billing only the professional component (PC) of a split‑bill eligible service—i.e., you performed the physician interpretation, medical judgment and prepared a…
    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…
    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…
    78CPT modifier -78 indicates an unplanned, related return to the operating or procedure room by the same provider during the global postoperative period. It is appended when treatment for a…- Use modifier -78 when an unplanned, related complication during the original procedure’s global postoperative period requires the patient to return to a formal operating or procedure room and the…
    80CPT® Modifier 80 (Assistant Surgeon) is appended to a surgical CPT code when a physician (MD or DO) provides full, continuous assistance throughout the operative procedure. It is intended only for…- Use CPT Modifier -80 when a physician (MD or DO) serves as an assistant surgeon and provides full, continuous assistance throughout the entire operative procedure; append -80 to the surgical CPT…
    73Modifier 73 indicates a facility-level outpatient hospital or ASC procedure that was discontinued after the patient was prepared and taken to the procedure/operating room but before any anesthesia…- When to use: Apply CPT modifier 73 on the FACILITY (outpatient hospital or ASC) claim when the patient has been fully prepared and physically taken into the procedure/operating room but the…

    Showing 1–10 of 11

    Related Provider Taxonomies

    8 rows

    Taxonomy Code
    207Y00000X
    207L00000X
    208000000X
    207Q00000X
    2085U0001X
    246QH0000X
    231H00000X
    364SS0200X

    Related ICD-10-CM Codes

    27 rows

    ICD-10-CM CodeDescription
    A49.9Bacterial infection, unspecified
    B96.89Other specified bacterial agents as the cause of diseases classified elsewhere
    G47.33Obstructive sleep apnea (adult) (pediatric)
    J02.9Acute pharyngitis, unspecified
    J31.0Chronic rhinitis
    J31.2Chronic pharyngitis
    J34.0Abscess, furuncle and carbuncle of nose
    J34.1Cyst and mucocele of nose and nasal sinus
    J34.89Other specified disorders of nose and nasal sinuses
    J35.1Hypertrophy of tonsils

    Showing 1–10 of 27

    Related Payer Policy Updates

    Specialty: Otorhinolaryngology (ENT)1 / 2

    10 rows

    PolicyPayerEffective Date
    Office-based Laryngeal ProceduresPremera Bluecross2026-10-06
    Otoacoustic Emissions Testing (for Oxford Only)UnitedHealthcare2026-10-01
    Hearing Aids and Devices Including Wearable, Bone-Anchored, and Semi-Implantable (for Indiana Only)UnitedHealthcare2026-10-01
    Injectable Dermal Fillers and Bulking Agents (for Kentucky Only)UnitedHealthcare2026-10-01
    Injectable Dermal Fillers and Bulking Agents (for New Mexico Only)UnitedHealthcare2026-10-01
    Injectable Dermal Fillers and Bulking AgentsUnitedHealthcare2026-10-01
    Injectable Dermal Fillers and Bulking AgentsUnitedHealthcare2026-10-01
    Injectable Dermal Fillers and Bulking Agents (for Nebraska Only)UnitedHealthcare2026-10-01
    Injectable Dermal Fillers and Bulking Agents (for Kansas Only)UnitedHealthcare2026-10-01
    Sinus Surgeries and Interventions (for North Carolina Only)UnitedHealthcare2026-10-01

    Related Codes

    CPT-42955-PHARYNGOSTOMY-LONG-TERM-FEEDING

    CPT 42955: Pharyngostomy for Long-Term Enteral Feeding

    CPT-42960-OROPHARYNGEAL-BLEEDING-CONTROL-POSTOPERATIVE

    CPT 42960: Control of Oral/Throat Bleeding After Surgery

    CPT-42961-OROPHARYNGEAL-POSTOPERATIVE-HEMORRHAGE-CONTROL-HOSPITAL

    CPT 42961: Control of Bleeding in Mouth and Throat, Inpatient

    CPT-42962-POSTOPERATIVE-ORAL-PHARYNGEAL-HEMOSTASIS

    CPT 42962: Control of Postoperative Bleeding in Mouth and Throat

    CPT-42970-POSTOP-NASOPHARYNGEAL-BLEEDING-CONTROL

    CPT 42970: Control of Postoperative Nasopharyngeal Bleeding

    CPT-42971-NASOPHARYNGEAL-BLEEDING-CONTROL-POST-ADENOIDECTOMY

    CPT 42971: Control of Nasopharyngeal Bleeding, Hospitalized Patient

    CPT-42972-NASOPHARYNGEAL-BLEEDING-CONTROL-POST-ADENOIDECTOMY

    CPT 42972: Surgical Control of Postoperative Nasopharyngeal Bleeding

    CPT-42975-ENDOSCOPIC-AIRWAY-EVALUATION-SLEEP-DISORDERED-BREATHING

    CPT 42975: Endoscopic Evaluation of Airway Under Sedation

    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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