CCSD code C4620 – Lamellar graft to cornea

Key takeaways

CCSD Code C4620 covers a lamellar (partial-thickness) corneal graft, such as deep anterior lamellar keratoplasty (DALK), in which the patient keeps their own endothelium.

A full-thickness perforating graft is C4630, and Descemet’s stripping endothelial keratoplasty (DSEK) is C4640. Endothelial grafts such as DSAEK and DMEK never go under C4620.

C4620 cannot be billed with C4630, C4640, C4650 or C4710 for the same operation, so pick the one code that matches the operative note.

UK private medical insurers expect pre-authorisation before surgery, a WHO ICD-10 diagnosis on the claim and an operative note that names the technique.

Pabau stores CCSD codes, authorisation numbers and operative records together and submits claims to insurers through Healthcode.

What is CCSD Code C4620?

CCSD Code C4620 is the code for a lamellar graft (keratoplasty) to cornea in the CCSD schedule. CCSD stands for Clinical Coding and Schedule Development. The CCSD Group maintains the schedule for the UK independent healthcare sector. Private medical insurers such as Bupa, AXA Health, Aviva and Vitality use it to pay consultants.

The official descriptor is Lamellar graft (keratoplasty) to cornea. The code sits in Chapter 4 (Eye and orbital contents), in sub-chapter 4.6.0, Cornea. It covers a corneal transplant in which only part of the corneal thickness is replaced with donor tissue.

In practice, C4620 is the code for anterior lamellar work, most often DALK. The surgeon removes the diseased stroma and keeps the patient’s own Descemet’s membrane and endothelium. Endothelial grafts have their own code, C4640, and a full-thickness graft is C4630.

What a lamellar keratoplasty involves: a clinical overview for coders

The cornea has five layers: epithelium, Bowman’s layer, stroma, Descemet’s membrane and endothelium. A lamellar graft replaces the front layers and leaves the inner layers in place. Because the patient’s endothelium stays, the risk of endothelial rejection is lower than after a full-thickness graft.

Techniques you may see named in an operative note for C4620 include:

• Deep anterior lamellar keratoplasty (DALK): the surgeon removes the stroma down to Descemet’s membrane, often with a big-bubble technique. A donor button without endothelium is then sutured in place.
• Anterior lamellar keratoplasty (ALK): a shallower graft that replaces part of the stroma, used where the scarring or thinning does not reach the deep stroma.
• Tectonic lamellar graft: a partial-thickness patch used to restore the strength of a thinned or ulcerated cornea.

Typical reasons for surgery are keratoconus, stromal scarring after infection or injury, and stromal dystrophies. Disease that sits in the endothelium, such as Fuchs endothelial dystrophy, needs an endothelial graft instead, which you bill under C4640.

Neighbouring CCSD corneal codes and how to choose the right one

Four neighbouring codes in the cornea section describe other grafts or corneal repairs. The CCSD schedule lists all four as unacceptable combinations with C4620, so only one of them goes on the claim for a single operation. The table below shows how to tell them apart.

The CCSD schedule is the authoritative source for descriptors and combination rules. You can check how an individual insurer lists the code with the Bupa code search. For a wider view of the schedule, see our guide to CCSD procedure codes for Bupa claims.

Why DSAEK and DMEK are not billed as C4620

Many people call DSAEK and DMEK posterior lamellar grafts, so teams often mix them up with C4620. In the CCSD schedule they belong to the endothelial keratoplasty code, C4640. Billing an endothelial graft as C4620 puts the wrong procedure on the claim, and the insurer is likely to query or refuse it.

C4620 vs a perforating graft: when the code changes in theatre

The most common coding error on corneal grafts is a mismatch between the code and the graft thickness. If the patient keeps any of their own posterior layers, the graft is lamellar and the code is C4620. If the surgeon replaces the full thickness of the cornea, the code is C4630.

A planned DALK can become a perforating graft if Descemet’s membrane ruptures during dissection. When that happens, the claim must carry C4630, not C4620. Code from what the operative note says the surgeon did, not from the theatre schedule.

ICD-10 diagnosis codes paired with C4620

UK insurers expect a diagnosis code on the claim alongside the CCSD code. UK private claims use the WHO ICD-10 classification, not the US ICD-10-CM edition. The codes below are the ones most often paired with an anterior lamellar graft.

Pick the code that matches the indication written in the consultant’s notes. Where you code a stromal dystrophy under H18.5, make sure the operative note names the stromal type. Otherwise the insurer may read the diagnosis as an endothelial condition that fits C4640.

Pre-authorisation with UK private medical insurers

UK private medical insurers expect you to get authorisation for corneal graft surgery before it goes ahead. The patient usually contacts their insurer to get an authorisation number once the consultant has recommended surgery. Requirements differ by insurer and by policy, so check the insurer’s provider guidance before you list the patient.

Information an insurer may ask for includes:

• The CCSD code and the diagnosis: C4620 plus the WHO ICD-10 code for the indication.
• A clinical summary: a letter from the consultant setting out the diagnosis, the treatments already tried and why a lamellar graft is the right option.
• Supporting findings: results such as corneal topography and pachymetry that show the extent of the stromal disease.
• Admission details: the hospital, the planned date and whether the patient is a day case or an inpatient.

Confirm the authorisation number before the day of surgery and record it against the booking. If the plan changes, for example from a lamellar to a perforating graft, tell the insurer and ask them to amend the authorisation.

Documentation requirements for C4620 claims

An insurer can ask for the clinical records behind any claim, and an incomplete record is a common reason for a refused corneal graft claim. Structured digital forms and clinical record management make it easier to capture each item at the point of care.

Keep the following on file for each C4620 operation:

• Operative note: names the technique (for example DALK), confirms the graft was partial thickness and records any conversion to a perforating graft.
• Donor tissue record: the tissue reference supplied with the cornea, recorded in the notes so the graft can be traced to its donor.
• Pre-operative findings: slit-lamp, topography and pachymetry results that support the indication.
• Visual acuity: pre-operative and post-operative best-corrected visual acuity.
• Diagnosis code: the WHO ICD-10 code on the claim matches the indication in the notes and the authorisation.
• Authorisation number: the insurer’s reference, entered exactly as issued.

How to submit a C4620 claim through Healthcode, step by step

Most UK consultants send insurer claims electronically through Healthcode, the clearing house used across the UK private sector. Getting each field right the first time avoids a cycle of queries and resubmissions that delays payment.

1. Check the authorisation: make sure the authorisation number is valid for the date of surgery and the procedure performed.
2. Select the code from the operative note: enter C4620 only for a lamellar graft. If the graft was converted to full thickness, use C4630 instead.
3. Add the diagnosis: enter the WHO ICD-10 code that matches the notes and the authorisation.
4. Check the combination rules: do not add C4630, C4640, C4650 or C4710 for the same operation.
5. Bill only the consultant’s fee: the hospital and the anaesthetist raise their own invoices for the same admission.
6. Submit promptly: each insurer sets its own time limit for claims, so check its provider terms and send the invoice soon after treatment.

Anaesthetist and hospital charges

C4620 covers the surgeon’s fee. The anaesthetist bills separately for the anaesthetic, and the hospital invoices the insurer for theatre time, the bed and other hospital charges. Do not fold any of these into the consultant’s C4620 claim.

Donor tissue and eye bank charges

In the UK, donor corneas come from licensed tissue banks such as NHS Blood and Transplant Tissue and Eye Services. The hospital normally orders the cornea, so the tissue charge sits with the hospital, outside the consultant’s fee. Check how the hospital and the insurer handle tissue costs before you assume the policy pays for them.

Common reasons a C4620 claim is refused

Insurers refuse corneal graft claims more often than routine ophthalmology claims. They involve several documents and three codes that are easy to confuse. Most refusals trace back to one of the causes below.

How to challenge a refused C4620 claim

1. Get the reason: read the remittance or contact the insurer’s provider team to find out why the claim was refused.
2. Correct and resubmit: where the refusal was a coding or data error, fix the claim and send it again through Healthcode.
3. Ask for a review: where the insurer disputes the treatment itself, send a letter from the consultant with the operative note and supporting findings.

Follow-up care, graft rejection and repeat grafts

Billing does not end with the operation. Follow-up appointments, rejection episodes and further surgery each raise their own coding questions.

Insurers set their own rules on which post-operative appointments the surgical fee includes. Check the insurer’s terms before you bill follow-up visits separately. Where a rejection episode needs treatment, code the visit with the matching consultation code. Use the WHO ICD-10 code T86.8, failure and rejection of other transplanted organs and tissues, as the diagnosis.

If the graft needs surgical revision, the code is C4650. If the surgeon replaces a failed graft with new donor tissue, code the graft performed and get a fresh authorisation first. Insurers publish their own fee schedules, such as the Aviva fee schedule and the Vitality fee finder.

How Pabau supports CCSD Code C4620 billing for ophthalmology practices

A private corneal service juggles several jobs for each graft. Staff chase authorisation, check that the code matches the operative note and keep records ready for an insurer query. Practice management software like Pabau keeps those jobs in one system.

In Pabau, you store CCSD codes against your services, so billing staff pick C4620 or C4630 from a set list instead of typing them. You record authorisation numbers against each booking, and operative notes and forms sit on the patient record. You then submit and track claims through Healthcode claims management to insurers such as Bupa, AXA Health and Aviva.

The result is fewer queried claims and faster payment. Consultants working across several hospitals keep their billing, records and theatre lists in one place, instead of in separate spreadsheets.

Streamline your corneal graft billing

Pabau helps UK private ophthalmology practices store CCSD codes, track pre-authorisation and submit claims through Healthcode. See how it works for your practice.

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Conclusion

An insurer pays C4620 when the record shows a partial-thickness graft that left the patient’s endothelium in place. Most of the work that protects the claim happens in theatre and in the operative note, not at the invoice stage.

Name the technique, record any conversion to a perforating graft and keep endothelial grafts on C4640. Do that, and the most common grounds for refusal disappear. 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? CCSD procedure codes for Bupa claims covers code structure and submission guidance for Bupa-recognised consultants.

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

Billing a corneal wound repair? CCSD Code C4710 covers repair of a corneal wound and how it differs from a graft.

Coding other Chapter 4 eye surgery? CCSD Code C6150 explains how revision of previous glaucoma surgery is billed.

Frequently asked questions