CCSD code G0400 – Open excision of oesophageal lesion

Key takeaways

CCSD Code G0400 covers open excision of a lesion of the oesophagus and sits in CCSD chapter 8, Thorax and intra-thoracic organs.

The operative note must confirm an open approach. A VATS excision is coded G1400, and resecting part of the oesophagus is an oesophagectomy code.

Insurers generally require pre-authorisation for major elective surgery such as G0400, so confirm the requirements with each insurer before the procedure date.

CCSD assigns G0400 a complexity band rather than a fee, and each insurer sets its own fee.

Pabau, the practice management platform we build, keeps authorisation references and operative documents in the patient file, ready for CCSD-coded invoices.

CCSD Code G0400: definition and code family

CCSD Code G0400 is the code for open excision of a lesion of the oesophagus. It sits in chapter 8 of the CCSD schedule, “Thorax and intra-thoracic organs”, within the oesophagus section. Endoscopic oesophageal procedures, such as G4410 and G6500, sit separately in chapter 10.

The official descriptor is precise: open excision of lesion of oesophagus. Confirm both elements, open approach and excision (as opposed to biopsy, drainage, or ablation), before you apply this code. Procedures carried out thoracoscopically or endoscopically, or where the intent was biopsy rather than full excision, fall under different CCSD codes.

The Clinical Coding and Schedule Development group maintains CCSD, and UK private medical insurers use it across PMI billing. The CCSD Technical Guide (October 2025) sets out the business rules governing code selection and unbundling across the schedule. The anaesthetist bills anaesthesia separately, so leave it off the G0400 line. Every code in the schedule is listed in our searchable CCSD code directory.

What the procedure involves

Open excision of an oesophageal lesion is a major thoracic or upper GI surgical procedure performed under general anaesthesia. In each case, the operating surgeon selects the approach based on lesion location along the oesophagus.

• Thoracotomy (right or left): the standard approach for mid- and upper-oesophageal lesions, typically performed with the patient in the lateral decubitus position
• Laparotomy (transabdominal): used for lesions at or near the gastro-oesophageal junction, with the patient supine
• Combined thoracoabdominal approach: reserved for large lesions straddling the junction or where wide access is needed

Once access is established, the surgeon identifies the lesion under direct vision, dissects it from surrounding tissue, and excises it with clear margins. The surgeon sends the specimen for histopathology. Then the surgeon repairs the oesophageal wall and closes it in layers. If the operation becomes a segmental resection with anastomosis or an interposition graft, it is an oesophagectomy and falls outside G0400.

This is clearly an open procedure. Therefore, CCSD Code G0400 does not apply when a thoracoscopic, laparoscopic, or endoscopic (transoral) technique is used. The operative note must state the approach taken, as insurer clinical reviewers flag any mismatch between the code and the documented technique.

Clinical indications: when G0400 is used

Open oesophageal lesion excision is indicated when a lesion cannot be safely or completely removed by endoscopic means. Its size, depth, or histological risk can also make open access the right standard of care.

Below are the most common diagnoses driving G0400 claims, with their relevant ICD-10 codes.

Leiomyoma is the most common benign oesophageal tumour requiring open excision. Leiomyomas arise from the muscularis propria, so endoscopic mucosal resection cannot remove them fully without leaving tumour in the muscle layer. Open enucleation is the accepted standard when size or location makes endoscopic removal unsafe.

Related CCSD codes: boundaries and differences

Selecting CCSD Code G0400 correctly requires ruling out the neighbouring oesophageal procedure codes. In practice, common causes of miscoding include a thoracoscopic or endoscopic route billed as open, and an oesophagectomy billed as a lesion excision.

In short, the route and the extent of removal decide the code. G1400 applies for thoracoscopic (VATS) excision of the same lesion. Sub-total oesophagectomy G0300 and total oesophagectomy G0220 are separate codes. The chart below lays out that decision in the order a coder should ask it.

CCSD descriptors and numbering change over time. Confirm neighbouring codes against the current schedule or an insurer’s own list, such as the Bupa CCSD procedure codes.

Documentation requirements for CCSD Code G0400

Documentation for G0400 serves two purposes: confirming the code is correct, and satisfying the insurer’s medical necessity review. UK PMI clinical reviewers often pend or reject claims that arrive without the full documentation set.

A complete G0400 claim pack needs each of these on file or attached at submission. Store them in a patient record the billing team can reach:

• Operative note confirming open approach: states the open route (thoracotomy or laparotomy) and that the lesion was excised, not biopsied or drained
• Histopathology report: confirms what the lesion was and, for malignant lesions, supports the medical necessity of the open approach
• Pre-operative imaging: CT chest/abdomen, OGD report, or endoscopic ultrasound demonstrating the lesion’s size, depth, and relationship to adjacent structures
• Consultant’s clinical letter: sets out the clinical indication, why endoscopic management was not appropriate or had failed, and the planned surgical approach
• Anaesthetic record: billed separately but must be on file; some insurers cross-reference the anaesthetic duration against the claimed procedure complexity
• Pre-authorisation reference number: the insurer issues it before the procedure date; a missing or invalid reference can lead to rejection

Notably, the operative note is the most closely checked document. Phrasing such as “lesion removed” without specifying the surgical approach is not enough. A note that reads “right thoracotomy performed, oesophageal leiomyoma identified and enucleated by open dissection” satisfies the standard. Digital operative record forms with structured fields for approach, technique, and specimen disposition reduce the risk of unclear documentation reaching the billing team.

Pre-authorisation and insurer requirements

Insurers generally require pre-authorisation for major elective surgery such as open oesophageal excision, so confirm with each insurer before the procedure date. Operating without a valid authorisation reference gives the insurer grounds to reduce the benefit or reject the claim.

However, insurer requirements vary in their specifics. The table below summarises what four UK PMIs typically request for a G0400 pre-authorisation. Insurers update their policies regularly, so verify requirements directly with them.

In addition, complex cases, or those needing clinical review, take more time to authorise. Request authorisation before booking the procedure date, not on the day of admission.

How to bill CCSD Code G0400: step-by-step claim submission

A correctly structured G0400 claim follows this sequence. Skipping a step, particularly the documentation checks, is where most preventable rejections start.

1. First, confirm pre-authorisation is in place before the procedure. Record the reference number in the patient file at once.
2. Next, verify the operative note clearly states: (a) open approach, (b) excision of oesophageal lesion, (c) technique used (thoracotomy, laparotomy, or combined).
3. Then select G0400 as the primary procedure code. Do not also code a diagnostic oesophagoscopy performed at the same session, unless the insurer’s unbundling rules explicitly permit separate coding.
4. Afterwards, attach the ICD-10 diagnosis code that matches the confirmed histopathology or pre-operative imaging. Use D13.0 for benign lesions, C15.x only where the lesion is a localised malignancy, and K22.8 for other specified diseases.
5. Also, leave anaesthesia off the G0400 line. The anaesthetist bills anaesthesia separately, following the insurer’s anaesthetic arrangements.
6. In addition, check assistant and multiple-procedure handling. These follow each insurer’s rules and the CCSD Technical Guide business rules, not modifiers.
7. Before submitting, verify the fee with the insurer. CCSD assigns a complexity band (Major 3 in the Bupa schedule); each insurer sets its own fee.
8. Lastly, submit electronically via the insurer’s provider portal or through your claims management software, attaching the authorisation reference and supporting documentation as required.

Common claim denial reasons and how to avoid them

Insurers deny G0400 claims for a narrow set of recurring reasons. Each one below comes with the fix that stops it delaying payment.

Coding pitfall: G0400 vs VATS excision and oesophagectomy

A common miscoding error on oesophageal lesion claims is billing CCSD Code G0400 when the surgeon used a minimally invasive route. The operative intent is the same and only the route differs. VATS excision G1400 applies for thoracoscopic excision.

Ultimately, the operative note is the final judge. If it describes a thoracotomy or laparotomy incision and direct-vision dissection, G0400 is correct. If it describes thoracoscopic ports and video assistance, G1400 applies instead. There is no endoscopic lesion-excision code in this section; G1460 covers EMR for Barrett’s high-grade dysplasia only.

The second boundary is extent. If a segment of the oesophagus is resected and reconnected, the operation is an oesophagectomy. Sub-total oesophagectomy G0300 and total oesophagectomy G0220 are separate codes, so check the note for an anastomosis before choosing G0400. If the oesophagectomy was completed through thoracoscopic and laparoscopic access, the claim takes G0260 instead.

A third pitfall occurs when a diagnostic OGD is performed immediately before the open excision in the same session. Some billing teams code both procedures. Check each insurer’s unbundling rules before adding a second code to the claim.

Fee schedule and reimbursement context for G0400

CCSD assigns a complexity band (Major 3 in the Bupa schedule); each insurer sets its own fee. As a result, reimbursement depends on the contracted rate between the consultant or hospital and the insurer.

UK private medical insurers apply their own benefit limits and recognition agreements. A consultant not recognised by a specific insurer may find their fee reduced to the insurer’s standard benefit rate. A pre-treatment benefit statement or pre-authorisation confirmation from the insurer sets out the amount it will cover. Consultants should ask patients to obtain one before any elective G0400 procedure.

Specific fee amounts are not quoted here because each insurer’s fee schedule changes and contracted rates vary. Check the current figure in the insurer’s own fee schedule portal; Vitality and Aviva both publish one, linked in the pre-authorisation table above. Those figures reflect each insurer’s benefit limits, not a CCSD rate.

How Pabau keeps G0400 claim packs complete

Surgical billing teams often chase G0400 paperwork across email, a hospital system and a spreadsheet of authorisation numbers. The operative note, histology and pre-authorisation reference rarely arrive together, so claims wait.

Pabau’s claims management tools keep the authorisation reference, operative documents and CCSD-coded invoice in the patient’s file. The billing team sees what is missing before submission, rather than after a rejection.

Manage CCSD claims and authorisation references in one place

Pabau helps UK private surgical practices track pre-authorisation references, attach operative documentation, and submit CCSD-coded invoices with fewer manual steps. See how it works for upper GI surgical billing.

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Conclusion

G0400 is right for one narrow case: an open operation that removes a lesion and leaves the oesophagus in place. Before coding, read the operative note for two facts, the route and whether any segment was resected. Those two facts send the claim to G0400, G1400 or an oesophagectomy code.

Settle the code and the authorisation before the procedure date, and the claim usually needs no rework. Book a demo to see how Pabau keeps authorisation references and operative notes ready for every CCSD claim.

Continue your research

Working with Bupa on CCSD-coded procedures? Bupa CCSD procedure codes and fee schedule covers the code structure, fee schedule navigation, and submission requirements specific to Bupa recognition.

Coding a bypass closure instead? CCSD code G0640: oesophageal bypass closure explains when the closure code applies and which oesophageal codes it cannot be billed with.

Repairing a ruptured oesophagus? CCSD code G0740: repair of rupture of oesophagus walks through the documentation and claim steps for emergency oesophageal repair.

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