ENT and Otolaryngology Medical Billing and Revenue Cycle Management 

Most practices show up with one of these.

Section 3

Allergy immunotherapy: prep, shot, and the unit count

Prep and administration are different services. If you mix the vial and only bill the injection, you are leaving the larger piece on the table. The unit math on 95165 is where practices either underbill every month or build an overpayment.

The split

95165: prep of multidose non-venom antigen vials. That is the code people argue about.

95144: single-dose vials, only when you prepare antigen someone else will inject. Bill it with an injection and the MAC re-prices it to 95165.

95115: one injection. 95117: two or more. One of those per day, never both. Neither if the patient self-administers.

Who bills what

Mixing your own extract does not block 95165

Forum threads keep asking this as if it were a grey area. It is not. Preparing the antigen is what the code describes. Billing shots only while you mix is underbilling real work.

Two unit definitions

Medicare: one billable unit = one 1 cc aliquot from a multidose vial, capped at ten units per vial. A 6 cc fill is six units. Two full 10 cc vials are twenty. A 5 cc vial is five units even if you pull ten half-cc clinical doses. Dilutions past the maintenance aliquots are not billable. Daily MUE is 30 units on 95165 (separate vials when antigens cannot mix).

Some commercial plans follow the CPT clinical-dose idea: a unit is a planned clinical dose. Same 5 cc vial drawn ten times can be ten units.

Same vial. Different number. The payer decides which rule you live under.

Two ways to get it wrong

Under: one unit per visit or per shot. Nothing denies. Cash just never shows up.

Over: more than ten units per multidose vial to Medicare, or diluted vials. Recoverable overpayment.

What an auditor opens first

Your billed units and your prep log have to match: antigens, volume, doses. 95165 sits on CERT radar for dose counting. A log that does not reconcile is the finding.

Commercial takebacks months later, payers rejecting the ten-per-vial basis, and reps calling 95165 "invalid" show up in public coding threads. A denial is not always proof you counted wrong. Sometimes the plan uses a different definition and never wrote it down clearly.

Compliance review before this section publishes.

Section 4 — free ENT tool

Antigen preparation unit calculator

Vial composition in, units out under both Medicare aliquot and clinical-dose methods, plus which administration code applies. Numbers and dropdowns only. No patient data. Runs in your browser.

This tool also lives at its own address: /tools/allergy-immunotherapy-unit-calculator/.

Section 5

Visit and endoscopy the same day

Yes when the evaluation is significant, separately identifiable, and more than the pre-procedure work. Diagnostic nasal endoscopy (31231) has a zero-day global, so a same-day visit is not automatically bundled. Documentation decides it. AAO-HNS guidance: do not hang 25 on every scope by habit.

If the "exam" portion of the note is mostly what the scope showed, you have one service written twice. History, exam and decision-making have to stand apart from the procedure itself.

Diagnostic nasal endoscopy and flexible laryngoscopy are bundled under the national edits. Override only when a separate rigid scope was truly needed and documented, and that should be rare.

Rhinologists do not all bill this the same way even when the guidance is clear. Internal arguments about it are normal. Payers notice the pattern.

Section 6

Why balloon dilation denies

Three different problems. Coverage or documentation short. Bundled into sinus surgery at the same site. A few plans still call it investigational. The first two are claim work. The third is contracting.

Commercial plans usually want chronic rhinosinusitis documented, failed maximal medical therapy, confirmatory imaging, and often prior auth. Medicare has no national determination; the MAC applies medical necessity. Some state Medicaid programs limit dilation to once per sinus per beneficiary for life.

Dilation codes bundle with the surgical codes for the same sinus. Balloon as an adjunct inside tissue-removal surgery: report the surgical code, not both. Two dilation codes on genuinely separate sinuses can be right with the right modifiers. Same-sinus edit is not fixed by a modifier.

Some groups get paid in the office by certain plans and refused by others that still treat the procedure as experimental. Denials that cluster by payer are coverage policy, not coding.

This code has been an enforcement target. Federal cases have involved reuse of single-use devices, fabricated records, and volumes far above devices purchased, including a 25-year sentence and multi-million forfeiture in one North Carolina matter, plus separate settlements on unnecessary procedures tied to referral arrangements. Peer-reviewed work showed balloon volume rising several-fold over a few years, with provider count growing much faster than traditional sinus surgery. Legitimate, well-documented dilation is still legitimate. The bar on the note is higher than for quieter codes.

Read as compliance context, not as a reason to stop billing real work.

Compliance review required.

Section 7

Septoplasty denied as cosmetic

Usually the chart never established functional obstruction, or the claim diagnoses only name the symptom. Coverage exists for functional indications. A note that reads like a better-looking nose loses.

Typical Medicare-style functional grounds: septal deviation with obstruction that failed weeks of conservative care; recurrent sinusitis secondary to the deviation; recurrent significant epistaxis; asymptomatic deviation blocking access for another necessary procedure; cleft-related repair; obstruction interfering with positive airway pressure.

Put the deformity on the claim. Sinusitis, rhinitis or epistaxis alone, without a deviation code, invites a denial because the face of the claim shows no structure being fixed.

Medicare guidance in this family treats anterior rhinoscopy or endoscopy as enough; photographs are not required for straight septoplasty. Several commercial plans want photos, especially with an external component. Get them before the case. You cannot invent them after.

Even with clean codes and solid necessity, first-pass denials are common and appeals are part of the job. An ENT quoted in coding trade press said the reimbursement may not always justify the work and risk. That is a fair commercial judgment. It is not a reason to skip medically necessary surgery. It is a reason to get diagnosis linkage and documentation right on the first submit.

Compliance review before publish.

Section 8

Audiology routing

Why the test was ordered decides coverage, not the diagnosis and not whether a hearing aid followed.

Covered: ordered for symptoms or disease (hearing change, imbalance, tinnitus, ear disease or injury), including when the result later supports a hearing aid.

Not covered: done only to fit or evaluate a hearing aid with no medical question.

Front desks that treat "hearing" as non-covered write off payable diagnostic work. Submitting pure fitting exams to Medicare produces denials and refund risk. Document the medical reason at the order.

Since 1 January 2023 a beneficiary can see an audiologist directly once every twelve months for certain non-acute diagnostic tests, reported with the designated modifier. Vestibular and balance testing and anything tied to hearing aids generally stay outside that exception.

Cochlear implants and certain bone-anchored devices are prosthetics, not excluded hearing aids, when criteria are met. Candidacy and programming are billable.

Expected non-covered service: give the patient notice before the test if you intend to bill them. After is too late.

Section 9

What moved in 2025 and 2026

G0561, effective 1 January 2025, is an add-on to 69433 when a tube delivery device is used under topical or local anesthesia. It captures device and practice expense. The iontophoresis automated path is Category III 0583T. Do not stack G0561 with 0583T, or 69433 with 0583T. Match the system you actually use.

For 2026, a 2.5 percent efficiency cut hits work values and intra-service time on most non-time-based codes. That is most of ENT procedure work. Specialty estimates put the typical hit around half a percent to one and a half percent per code. New codes first valued for 2026 are exempt.

Indirect practice expense for facility services was reduced, which shifts value toward the office. For a specialty with heavy in-office volume that direction helps. Net effect still depends on your own office versus facility mix.

Audiology direct access from 2023 remains. Broader legislative expansions had not passed as of early 2026.

Section 10

What we handle

Section 11

Outsource or keep a certified coder in house?

A single-provider shop with a simple mix, no in-office allergy, and a biller who works denials may not need us. Allergy units, in-office procedures, and a mixed pediatric and adult book are where specialty errors live.

Section 12

Free 48-hour AR audit

We usually start with immunotherapy unit reconciliation and same-day endoscopy patterns. If the file is clean we say so.

Section 13

Common questions

Section 14

Sources

• CMS Billing and Coding: Allergy Immunotherapy (Article A57472)
• AAOA: Understanding Billable Units, Avoiding Denials and Optimizing Compliance
• CMS LCD: Cosmetic and Reconstructive Surgery (L39051), including septoplasty guidance
• CMS Medicare Benefit Policy Manual, Chapter 15: audiology services and hearing aid exclusion
• CMS Audiology Services overview: covered and non-covered services
• CMS Calendar Year (CY) 2025 Medicare Physician Fee Schedule final rule
• CMS Calendar Year (CY) 2026 Medicare Physician Fee Schedule final rule (CMS-1832-F)
• AAO-HNS: CPT for ENT, modifier 25 guidance
• AAO-HNS: CPT for ENT, tympanostomy (PE) tubes
• CMS National Correct Coding Initiative (NCCI) Policy Manual
• DOJ: Raleigh ENT doctor sentenced to 25 years for adulterating surgical devices (United States v. Anita Louise Jackson)
• FDA OCI: Raleigh physician found guilty of using adulterated medical equipment on patients
• MGMA data reports: cost and revenue survey benchmarking (cross-specialty)