CCSD code C6920 – Paracentesis of the eye

Key takeaways

CCSD code C6920 covers anterior chamber paracentesis, the aspiration of aqueous humor, not a vitreous tap or an intravitreal injection.

Primary angle-closure glaucoma (H40.2) and central retinal artery occlusion (H34.1) are the main ICD-10 pairings, alongside diagnostic aqueous sampling.

UK insurers band and pay C6920 differently: Freedom and National Friendly list it as Intermediate, while Bupa lists it as Minor.

CCSD has no laterality modifiers, so the note must name the operated eye and record IOP before and after the procedure.

Pabau’s claims management software helps UK private practices send C6920 claims to Healthcode and track each one to payment.

CCSD code C6920: Definition and procedure overview

CCSD code C6920 is the UK private medical insurance code for paracentesis. Freedom’s schedule descriptor is “Paracentesis”; Bupa and National Friendly list “Paracentesis of the eye.” The surgeon inserts a fine-gauge needle or blade at the corneal limbus and draws aqueous humor from the anterior chamber.

CCSD stands for Clinical Coding and Schedule Development. The group publishes the procedure schedule used by UK private insurers such as Bupa, AXA, Aviva, Freedom and National Friendly. It sets the codes, while each insurer sets its own complexity band and fee.

C6920 sits in chapter 4 of the schedule, Eye and orbital contents, among the iris and anterior chamber codes. You can browse its neighbors in our CCSD codes by chapter index.

Ocular plaque brachytherapy sits in the same chapter under CCSD schedule code C8654, which covers insertion of a radioactive plaque into the eye.

The procedure is usually done under topical or local anesthesia, as a day case or in an outpatient setting. It covers the anterior segment only. During cataract surgery it is bundled into the main fee, unless the paracentesis is a separately documented service with its own indication.

Clinical indications: When paracentesis is performed

Four clinical scenarios justify billing C6920. Each one needs a matching ICD-10 diagnosis on the claim.

• Acute angle-closure glaucoma: Emergency decompression of raised intraocular pressure (IOP) when medical therapy is not enough. This is the most common urgent indication.
• Central retinal artery occlusion (CRAO): Rapid IOP reduction to improve arterial perfusion. The procedure is time-sensitive and often done before any insurer can be contacted.
• Aqueous humor sampling: Diagnostic aspiration for microbiological culture, PCR or cytology. Typical reasons include an endophthalmitis workup, suspected viral uveitis and suspected intraocular lymphoma.
• Intraoperative IOP management: Paracentesis done as a distinct step before another anterior segment procedure. It is billed separately only when the note shows a separate service.

Most UK insurers pay CCSD fees only to consultants they recognize for the specialty. Check that the operating ophthalmologist is recognized by the patient’s insurer before treatment.

How the procedure is performed

Knowing the procedural steps helps billing staff check that the operative note supports C6920 before the claim goes out.

1. Topical anesthesia: Oxybuprocaine or proxymetacaine drops are instilled. Local infiltration is used for anxious or uncooperative patients.
2. Sterile preparation: Povidone-iodine is applied to the ocular surface, and a sterile drape is placed.
3. Needle insertion: A 27- or 30-gauge needle, or a paracentesis blade, enters at the corneal limbus. It is directed away from the lens and iris.
4. Aqueous aspiration: 0.1–0.2 mL of aqueous humor is removed under controlled pressure. For diagnostic sampling, the specimen goes straight to the laboratory.
5. Post-procedure check: IOP is measured with a tonometer and a topical antibiotic is applied. The eye is padded if indicated.

The operative note should record each of these steps. The post-procedure IOP reading matters most, because it shows the decompression worked.

C6920 fees and complexity bands by insurer

The fee depends on whose schedule the patient’s policy follows. Published schedules even disagree on the complexity band for C6920.

Freedom Health Insurance published its figures in January 2026, and National Friendly publishes its schedule as a PDF. Freedom lists no anesthetist fee for C6920, which fits a procedure done under topical anesthesia.

Check the insurer’s current schedule before you quote the patient. Our Bupa CCSD codes guide explains how Bupa’s fee categories work.

What CCSD code C6920 includes and excludes

Insurers read the scope of C6920 strictly. Billing a bundled service separately leads to a query or a recovered payment.

Freedom’s chapter 4 schedule states that its cataract fee already covers injection into the anterior chamber. Treat routine intraoperative steps the same way, and keep them in the note rather than on the invoice.

Neighboring and commonly confused CCSD codes

Most C6920 coding errors come from picking a neighbor that describes a different act in the same chamber. The bands below come from Freedom’s January 2026 schedule.

Two questions settle the choice. Which segment did the surgeon enter, and did fluid come out or go in?

See our guide to CCSD code C6930 if the chamber received a drug rather than having fluid removed. Turn to CCSD code C6910 when the procedure note describes reforming a flat or shallow chamber instead of draining it.

ICD-10 diagnosis codes that support C6920 claims

Every C6920 claim needs a primary diagnosis that explains the paracentesis. UK insurers use WHO ICD-10, which has no fifth-character laterality codes. The table lists the usual pairings.

Because WHO ICD-10 does not record which eye was treated, the procedure note has to carry it. State the eye in words, not only on a diagram.

Documentation requirements for billing C6920

The procedure note is the first document an insurer asks for when it queries a claim. Make sure it carries each of the following elements.

• Clinical indication: The diagnosis behind the paracentesis, matching the ICD-10 code on the claim.
• Laterality: The eye treated, right or left, stated in the note body rather than inferred from a diagram.
• Technique: Needle gauge, limbal entry site, volume aspirated in mL, and whether a specimen was sent.
• Pre-procedure IOP: The tonometry reading before the procedure, in mmHg.
• Post-procedure IOP: The tonometry reading after aspiration, confirming decompression.
• Anesthesia type: Topical drops or infiltration, with the agent used.
• Outcome statement: Whether the procedure met its goal, for example “IOP reduced from 42 to 18 mmHg.”

A digital procedure-note template can require each of these fields before the note is signed. Missing IOP readings then get caught before the patient leaves, rather than after an insurer query.

Pre-authorization: Check each insurer’s rules

Pre-authorization rules for C6920 are set by each insurer and each policy, so check them claim by claim. CCSD sets the code, not the authorization process.

• Planned procedures: For diagnostic sampling booked in advance, the patient or practice usually contacts the insurer first. Record the authorization number on the claim.
• Urgent procedures: CRAO and acute angle closure are often treated before anyone can call the insurer. Ask the insurer how it handles retrospective requests, and keep contemporaneous notes showing the urgency.
• Emergency cover: Some UK policies exclude emergency treatment altogether. Check the patient’s cover before you invoice the insurer rather than the patient.
• Same-session procedures: If paracentesis happens during another operation, confirm whether the insurer authorized both codes.

An urgent classification must be supported by notes written at the time. A note reconstructed after a query carries little weight with an insurer.

Laterality, bilateral procedures and co-billing

CCSD does not use laterality modifiers. Where side matters to the fee, the schedule gives some procedures separate unilateral and bilateral codes instead.

• Separate codes: Laser iridotomy, for example, is C6230 for one eye and C6231 for both.
• C6920 has one code: The schedule has no bilateral variant, so ask the insurer how it wants paracentesis of both eyes claimed.
• Name the eye anyway: The claim cannot show the side, so the operative note must.

Which iridotomy code applies depends on the session, not on the number of eyes alone. C6230 covers one eye, and C6231 applies only when both eyes are treated in the same session. Two eyes treated on separate dates bill as two C6230 lines, not one bilateral code.

For co-billing, laboratory analysis of an aqueous sample is billed by the laboratory. The anesthetist bills separately when sedation or general anesthesia is used. Check the insurer’s rules before billing a consultation on the same day as C6920.

Why C6920 claims get queried and how to fix them

Most C6920 queries trace back to the procedure note or the code choice. Tracking the reason for each query shows which one to fix first, as our guide to denial management in healthcare explains.

CPT code equivalent for CCSD code C6920

Practices with US-insured patients sometimes need the CPT equivalent of C6920. This comparison is for reference only, because CPT and CCSD codes are never interchangeable on a claim.

CPT splits paracentesis across four codes by purpose, while CCSD uses one. CPT 65800 maps to diagnostic sampling and 65805 to pressure release, such as CRAO or angle closure.

How Pabau keeps C6920 claims moving

Private ophthalmology practices often run claims in two places. The booking lives in one system, while the claim is keyed into Healthcode by hand.

Pabau, the practice management platform we build, sends claims to Healthcode from the patient record. With its claims management software, the CCSD code, membership number and authorization reference carry across without rekeying.

Each claim moves through clear stages, from pending to paid, in one dashboard. Your team answers insurer queries while the case is fresh, instead of weeks later.

Get C6920 claims paid without rework

Pabau helps UK private practices send CCSD claims like C6920 to Healthcode from the patient record. Then you can track each claim to payment in one place.

Book a demo

Conclusion

C6920 pays modestly for a quick procedure, and its fee and band change with the insurer. Whether the claim pays depends mostly on the note behind the code.

Name the eye, record IOP before and after, and tie the diagnosis to the reason you drained the chamber. Do that in the template, and insurer queries become rare.

Book a demo to see how Pabau carries a C6920 claim from the patient record to Healthcode and tracks it to payment.

Continue your research

Want every Bupa code in one place? Bupa CCSD procedure codes sets out the schedule and how Bupa’s fee categories work.

Injecting into the chamber instead? CCSD code C6930 explains how anterior chamber injections are billed.

Removing a fragment from the chamber? CCSD code C6980 covers foreign body removal from the anterior chamber and its fees.

Browsing codes by chapter? CCSD codes by chapter lists each chapter of the schedule with links to every code guide.

Struggling with recurring claim queries? Denial management in healthcare shows how to track query reasons and fix them at source.

Frequently asked questions