CCSD code C6150 – Revision of previous glaucoma surgery

Key takeaways

CCSD Code C6150 covers surgical revision of a previous glaucoma operation, not a first-time procedure.

First-time surgery has its own codes: C6010 for trabeculectomy, and C6051 or C6052 for aqueous shunt tube surgery.

Bleb needling is billed under its own code, C6180, and cyclodiode laser treatment under C6720.

The surgeon’s fee includes topical or local anaesthetic, so it is never charged as a separate line.

Practice management software like Pabau supports CCSD code selection, authorisation tracking and claim submission through Healthcode.

What is CCSD Code C6150?

CCSD Code C6150 is the procedure code for revision of previous glaucoma surgery (including topical local anaesthetic) under the UK private medical insurance coding framework. It sits in section 4.8 (iris and anterior chamber) of Chapter 4 and carries a Major complexity rating.

The Clinical Coding and Schedule Development (CCSD) Group publishes and maintains the code. The major UK private medical insurers (PMI) use its schedule. It applies only to private care. Hospitals record NHS-funded glaucoma surgery with OPCS-4 procedure codes instead.

The “revision” element is the defining characteristic. C6150 applies only when an earlier incisional glaucoma operation exists and now needs surgical correction. A consultant billing C6150 must be able to document the original operation and the clinical reason for revising it. Billing this code for a first-time glaucoma operation is a coding error and a denial trigger.

C6150 is one of several glaucoma codes in section 4.8, and the neighbouring codes section below shows how to choose between them. The wider schedule of CCSD codes for consultants covers the rest of Chapter 4.

What procedures does C6150 cover?

C6150 captures the surgical revision of a previously performed glaucoma operation. The main clinical scenarios are trabeculectomy revision, surgical bleb revision and glaucoma drainage device revision.

• Trabeculectomy revision: the most common indication. The original filtration site has failed or is over-draining, and it needs surgical revision to restore adequate IOP control.
• Surgical bleb revision: open revision of an encapsulated, leaking or overhanging bleb in theatre. Examples include excision of scar tissue or resuturing of the scleral flap.
• Glaucoma drainage device (GDD) revision: revision of a tube shunt such as an Ahmed valve, Baerveldt implant or Molteno implant. Tube occlusion, erosion or migration may make revision necessary.
• Other incisional glaucoma revisions: any previously performed incisional glaucoma procedure, provided the operative record confirms the original surgery and the reason for revision.

Bleb needling is not on this list because it has its own code, C6180. The section on bleb needling below explains where the line falls.

The common thread is that C6150 requires a documented prior operation. A history that shows only laser treatment, such as trabeculoplasty or cyclodiode, may not meet that threshold. Insurers generally read “surgery” as an incisional or implant-based procedure.

Anaesthetic inclusion: what topical local anaesthetic means for billing

The official descriptor for C6150 reads “including topical local anaesthetic”. The surgeon’s fee therefore already covers topical or local anaesthetic given by the operating surgeon. Charging it as a separate line alongside C6150 is an unbundling error, and the insurer will refuse that line.

An anaesthetist’s fee is a different matter. Insurer schedules list an anaesthetist fee against C6150. Freedom Health Insurance’s schedule for 2026 lists £550 for the surgeon and £285 for the anaesthetist. That fee applies only when an anaesthetist attends, for example to give sedation or a general anaesthetic.

The operative note should record the anaesthetic method and who gave it. Where an anaesthetist bills, they claim under the same procedure code through their own insurer registration. Confirm each insurer’s current fee and rules on its provider portal, as schedules change.

How the procedure is performed

A typical C6150 revision follows a structured sequence. Understanding the clinical steps helps practitioners write operative notes that satisfy insurer documentation requirements and survive pre-authorisation review.

1. Pre-operative assessment: the surgeon reviews the patient’s IOP history, visual field progression and prior surgical records. The notes confirm the original procedure, such as a trabeculectomy or tube shunt.
2. Slit-lamp evaluation of the prior surgical site: the surgeon assesses the bleb morphology, anterior chamber depth and tube position, and documents any subconjunctival scarring or bleb encapsulation.
3. Anaesthesia: the surgeon gives topical or local anaesthetic, which the C6150 fee includes. An anaesthetist attends only where sedation or a general anaesthetic is planned.
4. Revision of the prior surgical site: the surgeon may excise scar tissue or revise the scleral flap. On a tube shunt, the surgeon may reposition or patch the tube. The surgeon may apply an antimetabolite such as 5-fluorouracil (5-FU) or mitomycin C (MMC) to reduce re-scarring.
5. Post-operative IOP check: the team measures and documents intraocular pressure after the procedure. The target IOP and the level achieved support the clinical necessity of the revision.

Each of these steps belongs in the operative note. Recording them in the same order every time gives the insurer a consistent record to review, and gives the next surgeon a clear surgical history.

Neighbouring CCSD codes and how to choose the right one

C6150 sits among several glaucoma codes in CCSD Chapter 4. Selecting an adjacent code in error is a common audit finding for ophthalmology practices. The table below lists the key codes, using the descriptors and complexity ratings in Freedom Health Insurance’s Chapter 4 schedule (January 2026).

The most consequential distinction is between primary surgery and revision. A first trabeculectomy is C6010, and a first tube shunt is C6051 or C6052. Insurers will query or refuse a claim that bills a revision under a primary code, or a primary operation under C6150. Two questions settle the choice, as the diagram below shows.

The complexity ratings differ too. C6150 is Major, while primary tube surgery is Intermediate, so the surgeon’s and anaesthetist’s fees change with the code. Check current fees and descriptors on each insurer’s provider portal before quoting a patient.

What C6150 does not cover

Knowing the exclusions prevents unbundling errors and incorrect code selection. The following are outside the scope of C6150.

• Primary (first-time) glaucoma surgery: with no prior operation there is nothing to revise. Use C6010 for a first trabeculectomy, or C6051 (unilateral) or C6052 (bilateral) for first-time aqueous shunt tube surgery.
• Bleb needling: needling of a failing bleb, with or without antimetabolites, has its own code, C6180.
• Laser procedures: laser trabeculoplasty is C6110 (bilateral) or C6111 (unilateral), and cyclodiode laser treatment is C6720. Laser suture lysis after trabeculectomy is C6181.
• Medical management of raised IOP: starting or changing glaucoma drops, or other purely pharmacological IOP management, is not billable under C6150.
• Surgeon-given anaesthetic billed separately: as detailed above, topical or local anaesthetic is included in the C6150 fee.
• Removal without revision: explanting a drainage device without a revision component may need a different code. Confirm the correct code with the insurer before using C6150 in this scenario.

Bleb needling or C6150: which code applies?

Bleb needling is one of the most frequent follow-up procedures after trabeculectomy, and it has a dedicated code. C6180 covers “Bleb needling +/- antimetabolites (including topical or local anaesthetic)”. It sits in section 4.5 (conjunctiva) of Chapter 4, not alongside C6150 in section 4.8.

So a needling episode, with or without 5-FU or MMC, is billed as C6180 rather than C6150. That holds whether the needling happens at the slit lamp or in theatre. Freedom Health Insurance’s 2026 schedule lists a £100 surgeon fee for C6180 and no anaesthetist fee.

C6150 is the right code when the surgeon goes further and surgically revises the filtration site. Examples include open bleb revision, excision of an encapsulated bleb, or resuturing of the scleral flap. The operative note should make that difference plain. Freedom Health’s schedule pays £550 for C6150 against £100 for C6180, so insurers look hard at which one was billed.

A standalone subconjunctival injection with no needling is neither C6180 nor C6150. It maps to C4340 (subconjunctival injection). Verify every code against the current CCSD schedule before submitting.

Glaucoma drainage device revision and C6150

Tube shunt revision covers a range of surgical scenarios: repositioning a migrated tube, relieving tube occlusion, patching an eroding tube or adjusting flow. Where the operative record confirms that the original device is being revised rather than removed and replaced, C6150 is the appropriate code.

Revision and replacement are billed differently, so the note has to say which one happened. Revision means the original device stays in place after the procedure. Inserting a new tube is aqueous shunt tube surgery, which is C6051 or C6052, so a replacement case can involve a different code sequence. Confirm the combination with the insurer before submitting, as complex tube shunt cases are a common audit finding.

For cross-referencing complex ophthalmic procedure combinations, the Healix fee schedule publishes CCSD-based fee information that is useful alongside each insurer’s own schedule.

Documentation requirements for C6150

A C6150 operative note must show that an earlier glaucoma operation exists and that the current procedure surgically revises it. It must also record how anaesthesia was given. Missing any one element gives the insurer grounds for refusal.

• Reference to the prior surgery: the date and type of the original procedure, such as trabeculectomy or a named tube shunt model. Add the surgeon or hospital that performed it, if known.
• Indication for revision: the clinical reason, such as an encapsulated bleb, raised IOP despite prior surgery, tube migration or erosion. Support it with documented IOP readings and visual field data.
• Technique used: describe the revision steps performed. Where an antimetabolite is used, record the agent (5-FU or MMC), the dose and the application site.
• Anaesthetic method: record the drop or block used, such as proxymetacaine 0.5%, and whether an anaesthetist attended.
• Post-operative IOP measurement: the IOP achieved after the procedure, recorded in mmHg, supports clinical necessity and outcome documentation.

A procedure-specific operative note template prompts the surgeon to capture each of these fields at the time of surgery. With Pabau’s digital forms, the practice builds that template once and reuses it for every revision. Structured records also make insurer audit queries faster to answer.

Pre-authorisation: what UK insurers require before approving C6150

UK private medical insurers expect glaucoma surgery to be authorised before it goes ahead. Operating without a valid authorisation reference is a leading cause of outright refusal. Requirements differ by insurer, and policies change, so always check each insurer’s provider portal. The table below summarises typical requirements.

Consultants moving from the NHS into private ophthalmology often underestimate the admin of tracking authorisation across several insurers. Recording each patient’s authorisation reference, expiry date and approved code in one system prevents billing delays. Use the Bupa CCSD procedure codes reference to cross-check code recognition before submitting.

External portal links for reference: Bupa code search, AXA Health SpecialistForms, and Aviva fee schedule.

Billing C6150 alongside other CCSD codes

Most C6150 claims stand alone, but some revision episodes involve more than one procedure. A few rules keep a combined claim clean.

• Needling at a separate visit: bleb needling at a later appointment is its own episode, billed as C6180, not a second C6150.
• Antimetabolites during revision: 5-FU or MMC applied during the revision forms part of the procedure. Do not add a separate subconjunctival injection code for it.
• Combined procedures in one session: where revision is combined with another operation, such as cataract surgery, insurers apply their own multiple-procedure rules. Check how each insurer pays the second procedure before submitting.
• Bilateral surgery: C6150 has no bilateral variant, so confirm with the insurer how to bill revisions performed on both eyes.

Common reasons C6150 claims are denied

Most C6150 denials are avoidable. They cluster around a small number of administrative and documentation failures rather than clinical disputes.

• Missing pre-authorisation: the procedure went ahead before a valid authorisation reference was obtained, or the authorisation expired before the claim was submitted.
• No documented prior glaucoma surgery: the operative note describes a revision, but the claim carries no evidence of the original operation. Always include the prior surgery date and type in the notes.
• Primary and revision codes confused: billing a first-time trabeculectomy (C6010) or first-time tube surgery (C6051 or C6052) as C6150, or the reverse.
• Needling or laser billed as revision: using C6150 for bleb needling (C6180) or cyclodiode laser (C6720), or for complex glaucoma surgery that maps to C6160.
• Unbundled anaesthetic: charging the surgeon’s topical or local anaesthetic as a separate line alongside C6150.
• Incomplete operative note: no post-operative IOP measurement, no record of the antimetabolite used, or no record of the anaesthetic method. Insurers increasingly request operative notes on audit.
• Incorrect consultant billing number: the insurer recognition number on the claim does not match the surgeon who operated. This triggers a verification query and delays payment.

A short check before submission catches most of these errors while the invoice is still in the practice. The tip below lists the four points worth confirming on every C6150 claim.

How Pabau supports CCSD Code C6150 billing for ophthalmology practices

Private ophthalmology practices submitting CCSD claims juggle several jobs at once. They track authorisation across insurers, invoice with the correct code and keep operative records detailed enough to survive audit. Practice management software like Pabau brings those jobs into one system.

Pabau stores CCSD procedure codes against services, so billing staff select C6150, C6010 or C6180 from a set list rather than typing them. Pabau ties invoices to the procedure code, which reduces transcription errors. It also records authorisation reference numbers against each booking. Claims are submitted electronically through Healthcode claims management to insurers such as Bupa, AXA Health and Aviva.

The outcome is fewer refused lines and faster payment. Practices with several consultants or sites keep billing, operative records and theatre scheduling in one system, so month-end reconciliation stops meaning three spreadsheets.

Streamline your CCSD billing workflow

Pabau helps UK private ophthalmology practices manage CCSD codes, track pre-authorisation status and submit claims through Healthcode. See it in action.

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Conclusion

An insurer pays C6150 when the notes prove two facts: an earlier glaucoma operation, and a surgical revision of it. So the work that protects the claim happens in theatre, long before the invoice is raised.

Name the original operation, record the revision technique and the anaesthetic method, and confirm authorisation before the patient is listed. That costs a few minutes per case and removes the most common grounds for refusal. To see how Pabau keeps CCSD coding, authorisation and Healthcode claims in one workflow, book a demo.

Continue your research

Need the wider CCSD reference for Bupa? Bupa CCSD procedure codes covers code structure, Chapter 4 eye codes and submission guidance for Bupa-recognised consultants.

Checking how fees vary by code? Bupa procedure codes fee schedule explains how CCSD fee bands and reimbursement work across surgical specialties.

Billing another anterior chamber procedure? CCSD Code C6930 covers anterior chamber injection, another eye-chapter code that ophthalmology practices bill regularly.

Combining glaucoma and cataract work? CCSD Code C7123 covers phacoemulsification of cataract, useful when an insurer applies multiple-procedure rules.

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