ENT & Otolaryngology Billing Audit

Check the in-office endoscopies, sinus procedures and bilateral services that drive most ENT coding errors and denials.

Otolaryngology practices perform many diagnostic procedures in the office — nasal endoscopy, laryngoscopy, cerumen removal — on the same day as an evaluation, and that is where most errors start. An E/M billed with a diagnostic endoscopy needs a significant, separately identifiable evaluation and modifier 25; diagnostic endoscopy is included in surgical endoscopy performed in the same session; and bilateral procedures must be reported the way each payer expects, whether with modifier 50 or RT/LT. Sinus surgery adds its own traps, including the combined functional endoscopic sinus surgery codes and the balloon dilation codes. Our audit reviews in-office procedure notes, operative reports and audiology claims against what was billed.

Audit red flags

Diagnostic nasal endoscopy (31231) billed at nearly every follow-up visit without documentation of why it was needed.
E/M visits billed with modifier 25 on the same day as a minor procedure without a separately documented evaluation.
Bilateral procedures reported inconsistently across payers without checking each payer's rule.
Cerumen removal billed as 69210 when the note describes irrigation rather than instrumentation.

Audit action plan

1. In-Office Procedure Review — Sample same-day E/M and procedure claims and confirm each has its own documentation and the right modifiers.
2. Operative Note Audit — Check sinus surgery, balloon dilation and septoplasty claims against operative reports for laterality, bundling and medical necessity.
3. Payer Rule Mapping — Build a payer-by-payer reference for bilateral reporting and post-operative debridement so claims go out right the first time.

Codes reviewed

31231 — Nasal endoscopy, diagnostic (unilateral or bilateral)
31237 — Nasal/sinus endoscopy with biopsy, polypectomy or debridement
69209 / 69210 — Impacted cerumen removal by irrigation / with instrumentation (unilateral)
31295–31298 — Sinus ostial dilation with balloon

Frequently asked questions

Can we bill an office visit and a nasal endoscopy on the same day?

Yes, if the visit includes a significant, separately identifiable evaluation beyond the decision to perform the endoscopy. Append modifier 25 to the E/M and document the evaluation and the reason for the endoscopy separately.

Is cerumen removal billed per ear?

Yes. 69209 (irrigation) and 69210 (instrumentation) are unilateral codes, so removal from both ears is reported as a bilateral service using the method the payer requires, such as modifier 50.

Are post-operative sinus debridements billable?

It depends on the payer. Under Medicare, functional endoscopic sinus surgery codes have a zero-day global period, so a medically necessary debridement at a later visit can be billed separately. Commercial payer policies vary, so check the contract or medical policy.