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42831

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🩺 What CPT 42831 Represents — Deep Clinical and Coding Detail

CPT 42831 describes a primary adenoidectomy, similar in purpose to CPT 42830, but differentiated by patient age and/or surgical approach as defined in the AMA CPT manual.
This code is used when the adenoidectomy is performed as the primary procedure, without concurrent tonsillectomy, and when the patient falls into the age category specified by the AMA descriptor (which you can insert from your licensed CPT resource).

Understanding the clinical context

Adenoidectomy is one of the most common pediatric ENT surgeries. While adenoids naturally regress with age, they can remain enlarged or chronically infected in some patients, leading to significant morbidity.

CPT 42831 is used when the patient’s age or anatomy requires a different operative technique, instrumentation, or approach than the one described under CPT 42830.

Why this code exists separately

The AMA distinguishes adenoidectomy codes based on:

  • Patient age (you will insert the exact age range from your CPT manual)
  • Operative complexity
  • Anatomic considerations
  • Expected difficulty and resource use

You should use CPT 42831 when the patient falls into the age bracket defined for this code and the procedure is a primary adenoidectomy.

🟦 Clinical Indications for CPT 42831

1. Upper airway obstruction

Hypertrophic adenoids can obstruct the nasopharynx, causing:

  • Snoring
  • Mouth breathing
  • Noisy breathing
  • Sleep-disordered breathing
  • Pediatric obstructive sleep apnea

2. Recurrent or chronic otitis media

Adenoidal hypertrophy can block the Eustachian tube opening, leading to:

  • Chronic middle ear effusion
  • Recurrent acute otitis media
  • Conductive hearing loss

3. Chronic nasal obstruction

Patients may present with:

  • Persistent nasal congestion
  • Rhinorrhea
  • Postnasal drip
  • Chronic sinusitis

4. Adenoiditis

Chronic infection of the adenoids may cause:

  • Persistent sore throat
  • Halitosis
  • Chronic cough
  • Recurrent infections

5. Speech and resonance abnormalities

Severe hypertrophy may cause:

🟦 How the Procedure Is Performed

While techniques vary, the surgeon may use:

  • Curettage
  • Suction cautery
  • Microdebrider
  • Endoscopic visualization (especially in older children or adults)

The age-specific code 42831 reflects differences in:

  • Nasopharyngeal size
  • Tissue density
  • Bleeding risk
  • Instrumentation required
  • Visualization challenges

🟦 ICD‑10‑CM Pairings (with HCC Status)

Most common medically necessary diagnosis

  • J35.2 — Hypertrophy of adenoids
    • Not an HCC

Other valid diagnoses

  • J35.3 — Hypertrophy of tonsils with hypertrophy of adenoids
  • J35.8 — Other chronic diseases of tonsils and adenoids
  • J35.9 — Unspecified chronic disease of tonsils and adenoids
  • G47.33 — Obstructive sleep apnea
  • H65.3X — Chronic serous otitis media
  • H66.90 — Otitis media, unspecified

HCC Summary

None of the typical adenoidectomy diagnoses map to a CMS HCC category.

🟦 Global Surgical Package

  • Global period: 90 days
  • Includes:
    • Pre-op visit (day before/day of surgery)
    • The procedure
    • Routine post-op care
  • Excludes:
    • Return to OR for complications (‑78)
    • Unrelated E/M (‑24)
    • Distinct procedural services (‑59, X‑modifiers)

🟦 Assistant Surgeon

🟦 wRVU Information

Work RVUs vary by year and locality.
Check the CMS Physician Fee Schedule for:

  • wRVU
  • Facility vs. non‑facility RVUs
  • Status indicators

🟦 Includes / Excludes

Includes

  • Primary adenoidectomy performed on patients in the age range defined for this code
  • Removal of hypertrophic adenoids causing:
    • Airway obstruction
    • Sleep-disordered breathing
    • Recurrent otitis media
    • Chronic nasal obstruction

Excludes

🟦 MS‑DRG Information

Adenoidectomy is almost always outpatient, so MS‑DRG assignment is rare.

If inpatient:

  • DRG depends on principal diagnosis, not the procedure
  • Common DRG families:
    • Pediatric respiratory DRGs
    • ENT infection DRGs
    • Airway obstruction DRGs

🟦 Code Tree (Conceptual)

Surgery
 └── Digestive System
      └── Pharynx
           ├── Tonsillectomy (42820-42826)
           ├── Adenoidectomy (42830-42836)
           │     ├── 42830 - Primary adenoidectomy
           │     ├── 42831 - Primary adenoidectomy (age-specific)
           │     ├── 42835 - Secondary/revision adenoidectomy
           │     └── 42836 - Secondary/revision adenoidectomy (age-specific)
           └── Combined tonsil/adenoid procedures

🟦 Coding Examples

Example 1 — Age-Specific Primary Adenoidectomy

Example 2 — Chronic Otitis Media with Eustachian Tube Dysfunction

  • CPT: 42831
  • Dx: H65.33
  • Notes: Age-specific code used based on patient age

Example 3 — Pediatric OSA

  • CPT: 42831
  • Dx: [G47.33]]

Example 4 — Assistant Surgeon

🟦 Documentation Tips

  • Document:
    • Indication (OSA, obstruction, recurrent infections)
    • Physical exam findings (adenoidal hypertrophy)
    • Failed conservative therapy
    • Technique used
    • Hemostasis method
    • Any complications
  • For OSA:
    • Include sleep study results
  • For otitis media:
    • Document Eustachian tube dysfunction

📚 Sources

  • AMA CPT Professional Edition
  • CMS Physician Fee Schedule
  • ICD‑10‑CM Official Guidelines
  • CMS Global Surgery Guidelines
  • AAO‑HNS Clinical Practice Guidelines

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