CPT code 31276 – Endoscopic frontal sinus exploration

Key takeaways

CPT code 31276 reports endoscopic frontal sinus exploration, with or without tissue removal, and applies only to the frontal sinus.

The operative note must show frontal recess entry, exploration of the frontal sinus, any tissue removed, and the side treated.

Bilateral cases take modifier 50 or paired RT and LT lines, depending on what the payer accepts.

CPT 31276 carries a 0-day (000) global period under Medicare, and commercial payers commonly require prior authorization.

Never report 31276 with 31253 on the same side, because a total ethmoidectomy already includes frontal sinus exploration.

CPT code 31276 covers frontal sinus exploration, with or without tissue removal

CPT code 31276 is a surgical nasal/sinus endoscopy with frontal sinus exploration, with or without removal of tissue from the frontal sinus. It sits in the endoscopy section for the accessory sinuses of the AMA’s CPT code set.

In plain clinical terms, an otolaryngologist uses an endoscope to pass through the frontal recess and explore the frontal sinus. The surgeon may remove polyps, diseased mucosa, or bony partitions, but doesn’t have to. An exploration with no tissue taken still supports the code.

Here is what CPT 31276 covers at a glance:

• Procedure type: Endoscopic, transnasal approach to the frontal sinus.
• Anatomical site: The frontal sinus only, not the maxillary, ethmoid, or sphenoid.
• Required step: Exploration of the frontal sinus, with or without tissue removal.
• Typical indication: Chronic frontal sinusitis, frontal polyps, or recurrent acute frontal sinusitis that failed medical therapy.
• Setting: ENT surgery in an ambulatory surgery center or hospital outpatient department.

Coders often reach for 31276 when the note says “FESS with frontal involvement.” Read further first. If the surgeon only worked in the ethmoid or maxillary sinuses, 31276 doesn’t apply.

The surgical steps that make 31276 defensible

A note that says “frontal sinus addressed” won’t survive an audit. Here is the sequence a billable 31276 note should walk through.

1. Scope insertion: The surgeon advances a rigid nasal endoscope, usually 0 or 30 degrees, to see the middle meatus.
2. Frontal recess identified: The surgeon finds the narrow drainage path from the frontal sinus. This step separates frontal from ethmoid work.
3. Frontal sinus explored: The surgeon opens and explores the frontal sinus. Any polyps, diseased mucosa, or bony partitions removed are described, but removal is optional.
4. Opening confirmed: The surgeon confirms the frontal sinus ostium is open.
5. Side recorded: The note states right, left, or both.

Steps 2 and 3 are the anchors. Without them, auditors will question why 31276 was chosen.

Documentation decides whether 31276 gets paid

Payers deny vague 31276 notes fast. A clean claim for this code needs each element below in the record.

If your surgeons use templated operative notes, add prompts for frontal sinus exploration and the side treated. A generic “FESS completed” line won’t hold up under payer review.

31276 vs adjacent codes: The sinus and the technique decide

The frontal sinus code sits in a crowded family of endoscopic sinus codes. Picking the wrong neighbor is the most common FESS coding error. The table shows the codes most often confused with 31276.

Two mix-ups that cost the most

The 31276 vs 31267 mix-up costs the most. CPT 31267 is a maxillary antrostomy with tissue removed from the maxillary sinus. CPT 31276 is frontal sinus exploration, with or without tissue removal. When the surgeon treats both sinuses in one session, both codes may be reported, subject to bundling and modifier rules.

The 31276 vs 31296 distinction comes up when the surgeon uses a balloon. CPT 31296 is frontal sinus ostium dilation by balloon. Its siblings are 31295 for the maxillary sinus and 31297 for the sphenoid. If tissue was also removed from the frontal sinus, check current NCCI edits before billing both.

The panel below shows how to work through a frontal case one side at a time.

Bundling rules: What 31276 absorbs and what bills separately

The National Correct Coding Initiative (NCCI) decides which sinus codes bundle into 31276. Payment for each code then follows the CMS Medicare Physician Fee Schedule.

Codes you can’t bill with 31276 on the same side:

• Diagnostic endoscopy: 31231 is included in any surgical sinus endoscopy at the same session.
• Total ethmoidectomy with frontal exploration: 31253 already includes frontal sinus exploration. Bill 31253 alone for that side.

Codes that may be billed separately, with the right modifier:

• 31267: Separately reportable when the surgeon also treats the maxillary sinus. Add the modifier your payer requires for multiple procedures.
• Biopsy, polypectomy, or debridement: 31237 may be billed when done at a distinct site. Document that site clearly.
• 31296: Frontal balloon dilation. Check current NCCI edits, and never assume unbundling is allowed on the same side.

NCCI edits update every quarter. Treat the guidance here as general principles, and check the current CMS NCCI Policy Manual before you submit.

Modifiers for CPT code 31276 follow laterality and payer rules

Your modifier depends on the side, the case’s complexity, and what else happened in the session. A wrong or missing modifier is a direct path to denial.

Billing a bilateral case: Medicare accepts 31276 with modifier 50 on one line and pays 150% of the unilateral allowable. Many commercial payers want two lines instead, one with RT and one with LT. Check the payer’s rules before you choose.

Two setups always fail. Billing 31276 twice with no modifier gets denied. So does sending modifier 50 to a payer that wants RT and LT.

Medicare pays 31276 as a 0-day global procedure

Medicare sets payment for CPT 31276 through the CMS fee schedule, which updates every January. The figures below are general parameters. Check the current-year rate before you quote it to a surgeon or submit a claim.

Use the FastRVU 2026 RVU lookup tool to pull the current work, practice expense, and malpractice RVUs for 31276. Then apply your locality’s GPCI to get the Medicare allowable for your area.

How a 31276 claim moves from scheduling to payment

Most 31276 claims follow the same path. Each handoff is a point where it can stall.

1. Scheduling: The front desk checks whether the payer needs prior authorization and logs the number.
2. Surgery: The surgeon documents frontal sinus exploration, any tissue removed, and the side.
3. Coding: The coder reads the note, checks 31253 and 31231 bundling, and adds modifiers.
4. Submission: The claim goes to the payer with the authorization number and a supporting diagnosis.
5. Payment: The remittance posts, and any denial goes back to the coder with its reason code.

Run this checklist before you submit 31276

A two-minute review catches most 31276 errors. Run it on every claim, and keep the superbill lined up with the note.

• The note says the frontal sinus was explored, not just the ethmoids.
• Any tissue removed is described, or the note says none was taken.
• The side is recorded, and the modifier matches it.
• No 31253 sits on the same side.
• No 31231 is on the claim.
• The diagnosis supports frontal surgery, ideally J32.1 when the record backs it.
• The prior authorization number is on file for payers that need one.

Six denials that hit 31276 claims, and how to stop them

Frontal sinus claims draw denials because the documentation rules are specific and the code is easy to mix up. Keep a list of common denial codes handy to read remittances fast.

• Missing side: Notes without right, left, or both get rejected by most payers. Fix it with a side prompt in the note template.
• Thin operative note: “Endoscopic sinus surgery performed” can’t support 31276. Ask surgeons to name the frontal recess and the frontal sinus explored.
• 31231 billed with 31276: Diagnostic endoscopy is always included. Remove 31231 from any claim with a surgical sinus code.
• 31253 on the same side: The ethmoid code already covers frontal exploration. Keep only 31253 for that side.
• No prior authorization: Many commercial and Medicare Advantage plans need it for frontal sinus surgery. Add an authorization check to presurgical scheduling.
• Weak diagnosis or wrong bilateral format: Pairing 31276 with a single acute episode invites a medical necessity denial. So does sending modifier 50 to a payer that wants RT and LT.

Prior authorization for 31276 depends on the payer

Prior authorization rules for CPT 31276 vary by payer type, plan, and state. Never assume either way. Confirm with the plan before scheduling surgery.

• Traditional Medicare: Usually doesn’t require prior authorization for 31276. You still need records that show medical necessity if audited.
• Medicare Advantage: Many plans require it for FESS procedures, including 31276. Check the plan’s authorization lookup or call provider relations.
• Commercial insurance: Most major payers require it. Typical criteria include CT imaging showing frontal sinus disease and four to six weeks of failed medical therapy. Payers also expect a chronic or recurrent acute frontal sinusitis diagnosis.
• Medicaid: Often required, with criteria that vary by state. Some programs also want a specialist referral on file.

ICD-10 codes that support medical necessity for 31276

The diagnosis must justify surgery on the frontal sinus specifically. An acute or unspecified sinusitis code weakens the case when the record shows chronic disease.

No diagnosis code guarantees approval on its own. Payers weigh the full record, their own policy, and whether the code matches the documented condition. Use the most specific code the imaging and clinical notes support.

How claims software keeps 31276 claims clean

Many 31276 denials start with a claim keyed by hand from a scanned operative note. A missing authorization number or a mistyped side can sit unnoticed until the remittance comes back.

Pabau, the practice software our team builds for specialty practices, starts the claim from the patient record instead. Its claims software for practices pre-fills the CMS-1500, so the CPT and ICD-10 codes attached to the visit land on the claim. Built-in code libraries let your coder confirm 31276 and its diagnosis on the same screen.

The claim won’t send until required fields, such as the authorization number, are complete. US practices submit through Claim.MD to thousands of US payers, with real-time eligibility checks and ERA posting. So your team tracks each claim’s status without chasing payers by phone.

Send cleaner sinus surgery claims the first time

Pabau pre-fills each claim from the patient record and holds it until required fields are complete. US practices submit through Claim.MD and track every claim’s status.

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Conclusion

CPT 31276 rewards precision. Get the frontal anatomy, the side, and the code pair right in the note, and most denials never happen.

Start with the operative note template. Add a line for frontal sinus exploration and one for the side. Then check every 31276 claim against 31253 and 31231 before it goes out. That review adds a minute per case, which is far cheaper than an appeal.

Book a demo to see how Pabau pre-fills and tracks your sinus surgery claims straight from the patient record.

Continue your research

Need a framework for managing high-denial surgical codes? Denial management in healthcare covers systematic workflows for reducing claim rejections across surgical billing.

Want to understand how clearinghouses validate CPT claims? How medical claims clearinghouses work explains eligibility checks and claim validation before a payer sees the claim.

Looking to streamline ENT superbill documentation? Superbill documentation guide covers what belongs on a surgical superbill and how to connect operative findings to submitted CPT codes.

Worried about audit exposure on surgical codes? Medical billing compliance walks through the records and controls that keep a coding team audit-ready.

New to the revenue cycle side of ENT? What is medical billing explains how a claim travels from the encounter to the payment posted.

Frequently asked questions