Primary Source: American Medical Association (AMA) CPT 2025 Professional Edition. Reimbursement Data: Based on Medicare Physician Fee Schedule (MPFS) final rule and publicly available fee schedules. Coding Guidance: American Academy of Otolaryngology-Head and Neck Surgery (AAO-HNS) and CMS National Correct Coding Initiative (NCCI).

🧬CPT Code 31254 - Nasal/Sinus Endoscopy, Surgical; with Ethmoidectomy, Partial (Anterior)

Procedure Overview

CPT 31254 is a surgical CPT code that describes a Functional Endoscopic Sinus Surgery (FESS) procedure. It involves the use of an endoscope inserted into the nasal cavity to perform a partial ethmoidectomy, specifically targeting the anterior ethmoid sinus. The goal is to open the air cells, improve sinus drainage, and remove diseased tissue obstructing the osteomeatal complex.

Clinical Context

Approach: Minimally invasive, transnasal endoscopy.
Anatomy: Focuses on the anterior ethmoidal air cells located between the middle turbinate and the orbit.
Outcome: Restores mucociliary clearance and ventilation to the frontal, maxillary, and anterior ethmoid sinuses.

Code Tree & Hierarchy

Surgery (10000-69990)
 └── Respiratory System (30000-32999)
      └── [[31254]] Nasal/Sinus Endoscopy, Surgical; with Ethmoidectomy, Partial (Anterior)
           └── [[31255]] ... with Ethmoidectomy, Total (Anterior and Posterior)

Note on Indented Codes: 31255 is indented under 31254 in the CPT manual. This means 31255 includes the work of 31254 plus additional work. You cannot bill 31254 and 31255 together for the same side.

Key Coding Rules

Includes

Surgical endoscopy of the nasal and sinus cavities.
Partial removal of the anterior ethmoid sinus bone and/or mucosa.
Control of bleeding and visualization of the surgical field.
Suctioning of purulent material or mucus during the procedure (this is inherent to the surgery).

Excludes

Diagnostic endoscopy only: Use 31231.
Total Ethmoidectomy (Anterior & Posterior): Use 31255.
Debridement or Polypectomy alone: Use 31237.
Biopsy alone: Use 31237.

Do Not Report 31254 With (Same Side)

31253 (Total ethmoidectomy with frontal sinus exploration)
31255 (Total ethmoidectomy)
31257 (Total ethmoidectomy with sphenoidotomy)
31259 (Total ethmoidectomy with sphenoidotomy and tissue removal)
0406T or 0407T (Category III codes for sinus surgery)

ICD-10-CM Medical Necessity (Common Diagnoses)

Medical necessity for an ethmoidectomy must be clearly documented. Payer policies vary, so verification is recommended.

Diagnosis	Description	Clinical Notes
J32.2	Chronic ethmoidal sinusitis	Most common indication.
J33.8	Other polyp of sinus	Polyps originating in the ethmoid sinus.
J32.4	Chronic pansinusitis	Involvement of multiple sinuses including ethmoid.
J01.20	Acute ethmoidal sinusitis, unspecified	Usually for acute conditions with complications or recurrent episodes.
C31.1	Malignant neoplasm of ethmoidal sinus	Surgical resection.
D14.0	Benign neoplasm of middle ear and nasal cavity	Including ethmoid sinus.
J34.89	Other specified disorders of nose and nasal sinuses	e.g., mucocele, retention cyst requiring removal.
J32.9	Chronic sinusitis, unspecified	Use only if the specific sinus is not documented; may lead to denial.

Modifiers

-50 (Bilateral Procedure): Use if the partial ethmoidectomy is performed on both the left and right sides. Reimbursement is typically 150% of the unilateral rate.
-LT / [-[RT]] (Left/Right): Used to specify the side of a unilateral procedure.
-59 (Distinct Procedural Service): Used to indicate that 31254 was performed in a different anatomical site or was distinct from another procedure performed on the same day. Example: If a total ethmoidectomy (31255) is performed on the right, and a distinct partial ethmoidectomy (31254) is performed on the left, append modifier 59 to 31254.
-51 (Multiple Procedures): Used when multiple procedures are performed during the same session. The primary procedure (with the highest RVU) is listed first.
-79 (Unrelated Procedure): Used if the procedure is performed during the postoperative period of an unrelated surgery.

Reimbursement & Data

Work Relative Value Unit (wRVU)

Approximate wRVU: 3.50
Note: RVUs fluctuate annually based on the MPFS. Always verify the current year’s RVU via the CMS website or your fee schedule.

Assistant at Surgery

Assistant Payable: Yes. Sinus surgery can be complex, and Medicare and most private payers allow for an assistant surgeon. Reimbursement is typically 16% of the global surgical allowance. Check specific payer contracts.

Facility vs. Non-Facility

Facility (HOPD/ASC): This code is typically performed in an Ambulatory Surgical Center (POS 24) or Outpatient Hospital (POS 22) .
Non-Facility (Office): Rare, but if performed in the office, the non-facility RVU is higher to account for practice expenses (staff, supplies, equipment).

MS-DRG Assignment (Inpatient only if admitted)

If a sinus procedure results in an inpatient admission (uncommon for 31254 alone), it typically falls under:

MS-DRG 129 (Major Head & Neck Procedures) or
MS-DRG 152 (Otitis Media & URI with MCC)
Note: Assignment depends on the principal diagnosis and any comorbidities.

Coding Scenarios & Examples

Scenario 1: Unilateral Anterior Ethmoidectomy

Operative Report: A 45-year-old with chronic right ethmoid sinusitis fails medical management. The surgeon performs a right nasal/sinus endoscopy with partial anterior ethmoidectomy to open the osteomeatal complex.
Coding:
- CPT: 31254
- Modifier: -RT
- ICD-10: J32.2

Scenario 2: Bilateral Anterior Ethmoidectomy

Operative Report: Patient with bilateral nasal obstruction and polyposis. Surgeon performs a bilateral nasal/sinus endoscopy with partial anterior ethmoidectomies and polypectomies. (Note: Polypectomy is included in the surgical work of 31254).
Coding:
- CPT: 31254
- Modifier: -50
- ICD-10: J33.8

Scenario 3: Multiple Distinct Procedures (Bilateral, Different Extents)

Operative Report: Patient undergoes bilateral sinus surgery. On the left side, the surgeon performs a total ethmoidectomy (anterior and posterior). On the right side, disease is limited to the anterior ethmoid, so the surgeon performs only a partial ethmoidectomy.
Coding:
- Line 1: 31255 - -LT (Total ethmoidectomy, left side)
- Line 2: 31254 - -RT - 59 (Partial ethmoidectomy, right side, distinct procedure)
Rationale: The 59 modifier indicates that the partial procedure on the right was separate and distinct from the total procedure on the left, overriding the standard NCCI edit that bundles 31254 into 31255.

Documentation Tips

Specify the Extent: Clearly state “partial anterior ethmoidectomy” or “anterior ethmoidectomy.” If “total ethmoidectomy” is documented, use 31255.
Laterality: Always document the side (left, right, or bilateral). This supports the use of modifiers -LT, -RT, or -50.
Medical Necessity: Link the procedure to specific findings (e.g., CT scan showing opacified anterior ethmoid cells, polyps visualized on endoscopy) to support the ICD-10 diagnosis.
Distinctness: If performing multiple sinuses or separate procedures, document why they are distinct to support the use of modifier -59.

Disclaimer: This information is for educational purposes and does not constitute legal or billing advice. Coding and reimbursement guidelines are subject to change. Always consult the most current AMA CPT Manual, CMS guidelines, and specific payer policies.

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