CCSD code G3400 – Gastrostomy billing guide

Key takeaways

CCSD Code G3400 covers open surgical formation of a gastrostomy, not tube replacement or closure.

Percutaneous gastrostomy, whether endoscopic (PEG) or radiologically inserted (RIG), is coded XR585, which CCSD lists as an unacceptable combination with G3400.

Dysphagia secondary to neurological conditions such as motor neurone disease and stroke is a common indication supporting medical necessity.

Bupa, AXA Health and Aviva generally require pre-authorisation before a gastrostomy, and a missing authorisation reference is a common denial reason, so confirm each policy.

Pabau, the practice management platform we build, stores each pre-authorisation as a case, carries the code through to the claim, and sends claims via Healthcode.

CCSD Code G3400: Definition and clinical overview

CCSD Code G3400 is the code for gastrostomy, the open surgical formation of an opening between the stomach and the abdominal wall. It sits in chapter 11 (Abdomen), section 11.2.0 Stomach, of the CCSD schedule. The Clinical Coding and Schedule Development Group maintains that code set for UK private medical insurers.

The approach decides the code, not image guidance alone. Open or surgical formation is G3400. Percutaneous formation, whether endoscopic (PEG) or radiological (RIG), is XR585, the CCSD code for percutaneous gastrostomy as a sole procedure. CCSD lists XR585 and G3400 as an unacceptable combination, so the two should not appear on the same episode.

The CCSD system is used by all major UK private medical insurers including Bupa, AXA Health, Aviva, Vitality Health, and WPA. Each insurer publishes its own fee schedule and pre-authorisation requirements against CCSD codes. CCSD Code G3400 can therefore attract different reimbursement rates and pre-auth workflows depending on the patient’s insurer. With claims management software such as Pabau, each insurer’s pre-authorisation is stored as a case and its code carries through to the claim.

What gastrostomy involves: The procedure behind G3400

Gastrostomy is the surgical formation of a stoma connecting the stomach directly to the exterior of the abdominal wall. The goal is a feeding tube that bypasses the mouth and oesophagus entirely. It delivers enteral nutrition, hydration and medication to patients who cannot swallow safely or sufficiently.

The procedure is performed under general or local anaesthesia depending on patient fitness and the chosen approach. A tube or button device is secured within the stomach lumen and exits through the abdominal wall. Post-procedure, the tube enables direct gastric administration of feeds and fluids, which can be managed by the patient or a carer at home.

Gastrostomy is a long-term intervention, not a temporary measure. Nasogastric tubes are the short-term alternative. When nutritional support is expected to last more than four weeks, guidance from the British Association for Parenteral and Enteral Nutrition (BAPEN) generally favours gastrostomy.

Approaches covered and excluded by G3400

The approach used to form the gastrostomy is a frequent source of coding disputes and claim denials. Different techniques require different levels of skill, equipment, and clinical input, and the CCSD schedule reflects this through separate codes for distinct approaches.

Every operative note should settle two facts. Did the procedure create a new gastrostomy or replace a tube, and was the approach open or percutaneous? The diagram below maps each combination to its code. Verify the current CCSD schedule edition before submitting, because the Clinical Coding and Schedule Development Group updates descriptions and rules periodically.

Diagnoses that support medical necessity for gastrostomy

Private insurers require evidence of clinical necessity before approving CCSD Code G3400. The operative note must link the procedure to a primary diagnosis that makes oral or nasogastric feeding insufficient or unsafe. The most commonly accepted indications fall into three broad categories.

• Neurological dysphagia: Motor neurone disease (MND/ALS), stroke with persistent swallowing impairment, Parkinson’s disease with dysphagia, and cerebral palsy are conditions commonly cited in pre-authorisation requests. The consultant must document the swallowing assessment findings, typically from videofluoroscopy or a speech and language therapy evaluation. The note should confirm that aspiration risk makes oral feeding unsafe.
• Head and neck pathology: Obstructive head and neck cancers preventing safe oral intake, post-surgical oropharyngeal anatomy disrupting normal swallowing, and radiation-induced strictures are accepted indications. Oncology-related gastrostomy is often placed prophylactically before treatment begins.
• Malnutrition and nutritional failure: Significant weight loss and protein-energy malnutrition unresponsive to oral supplementation can support necessity, particularly in the context of a chronic condition. Nutritional assessment scores (MUST, NRS-2002) should be documented alongside dietary intake records.

Mapping each indication to its ICD-10 code strengthens the claim. Dysphagia secondary to cerebrovascular disease maps to R13.1 (dysphagia) with an additional code for the underlying stroke. Motor neurone disease maps to G12.2. Malnutrition codes begin at E40-E46 depending on severity. Including all relevant diagnosis codes, not only the primary, gives the insurer’s reviewing clinician the full clinical picture.

Documentation requirements for CCSD Code G3400 claims

Inadequate documentation is a common reason CCSD Code G3400 claims are denied. Insurers audit operative notes against their clinical criteria, and a note missing a required element can be rejected at the review stage.

The operative note must capture the following elements as a minimum:

1. Procedure approach: State explicitly whether the gastrostomy was performed endoscopically (PEG), laparoscopically, via open incision, or by radiological guidance. Approach determines the code. Open formation is G3400, and percutaneous formation, endoscopic or radiological, is XR585.
2. Clinical indication: Record the primary diagnosis and why it necessitates gastrostomy. Quote objective evidence: Swallowing assessment result, weight trajectory, nutritional screening score.
3. Tube or device type: Record the manufacturer, size, and type (balloon button, Foley-type, low-profile button). Insurers may require this for equipment cost separation.
4. Anaesthetic type: General or local/sedation. Anaesthetic costs are billed separately by the anaesthetist; the operative note should confirm what was used to prevent coding conflict.
5. Intraoperative findings: Any complicating anatomy, alternative sites considered, or unexpected findings that affected the procedure.
6. Surgeon identity and grade: Confirm the consultant surgeon performed the procedure, as CCSD surgical codes are submitted at consultant level.

A standardised operative note template for gastrostomy turns these six elements into required fields. Digital clinical notes that prompt for each field stop an element being skipped under time pressure.

Pre-authorisation: What UK insurers require before approving G3400

Gastrostomy is usually an elective procedure under UK private healthcare frameworks, and insurers generally require pre-authorisation before it proceeds. Rules vary by insurer and policy, so confirm them for each patient. A CCSD Code G3400 claim submitted without a valid authorisation reference is likely to be denied. Practices managing CCSD billing should establish a pre-auth workflow that runs parallel to the surgical booking process.

Pre-authorisation requirements change periodically. Practices should verify current rules directly through each insurer’s provider portal rather than relying on guidance that may be out of date. The Pabau Bupa CCSD billing guide covers Bupa-specific requirements in more detail, including common CCSD codes and Bupa’s invoicing rules.

Adjacent CCSD codes and how they differ from G3400

Selecting the wrong code from the G3400 neighbourhood is a common source of mis-coding. The table below maps the principal adjacent codes and the key distinguishing factors. For codes outside this table, start from the CCSD codes library.

Closing a gastrostomy once tube feeding ends is a separate episode, billed under G3440 in the same stomach section.

When the procedure involves combined access (gastrostomy formed during a larger upper GI procedure, for example), check the CCSD unbundling rules before submitting additional codes. Insurers apply their own unbundling guidelines, which may disallow separate billing for components they consider included in the primary code fee.

Common denial reasons and how to prevent them

Denials on CCSD Code G3400 claims tend to fall into five categories. Each is preventable with the right workflow in place before the procedure date.

Billing tips: Getting gastrostomy claims paid first time

A clean CCSD Code G3400 claim follows the same checklist before and after every procedure.

• Verify policy coverage before booking: Confirm the patient’s policy covers gastrostomy specifically and that the procedure falls within the plan’s benefit period. Some policies exclude procedures that are related to pre-existing conditions not declared at policy inception.
• Obtain and record the authorisation reference: The authorisation number must appear on every invoice submitted. Without it, insurer systems typically reject the claim before it reaches a clinical reviewer.
• Code the primary diagnosis first: Submit all relevant ICD-10 diagnosis codes alongside G3400. The principal diagnosis drives the medical necessity decision; secondary codes add clinical context that supports the approval.
• Separate anaesthetic and equipment costs clearly: The consultant’s surgical fee under G3400 does not include the anaesthetist’s fee or consumable device costs. Invoice these separately to avoid unbundling disputes.
• Submit within the insurer’s timescale: UK private insurers set their own invoice deadlines, often around 90 days from the procedure date. Missing the window closes the right to claim for that episode.
• Keep a copy of all supporting documentation: Appeals require the same clinical evidence as the original claim, plus correspondence showing the denial reason. A practice management system that stores these documents in the patient record makes them quick to retrieve.

How Pabau keeps gastrostomy claims tied to their pre-authorisation

Many surgical teams track authorisation references in email threads or spreadsheets, then retype them onto each invoice. A reference lost between booking and billing turns a clean G3400 claim into a denial.

In Pabau, each insurer’s pre-authorisation is stored as a case. The case carries the authorisation code through to the claim. A claim without one is flagged, so your team can assign a case before it goes out. UK claims are then sent to insurers via Healthcode.

The result is fewer G3400 claims leaving without an authorisation code, and less time spent matching references to invoices.

Manage CCSD billing and pre-authorisation in one place

Pabau stores each pre-authorisation as a case, carries the code through to the claim, and sends claims via Healthcode. See how it works for surgical teams.

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Conclusion

The code decision for a gastrostomy is made before the procedure, when the approach is confirmed. An open gastrostomy is G3400. A PEG or radiologically inserted tube is XR585, and CCSD lists the two as an unacceptable combination.

Once the code is settled, two documents carry the claim: the authorisation reference and an operative note that records approach, indication and tube type. Set both up before the theatre date, because fixing either after a denial means an appeal and a longer wait for payment.

Pabau stores each pre-authorisation as a case and carries its code onto the claim, so the reference reaches the insurer with the invoice. Book a demo to see how it works for surgical and specialist private practice teams.

Continue your research

Need guidance on Bupa CCSD codes and billing requirements? Bupa CCSD codes and billing guide covers Bupa-specific CCSD invoicing rules, fee schedules, and submission requirements for UK private practice.

Closing a gastrostomy once feeding support ends? CCSD code G3440 covers coding and documentation for closure of gastrostomy in the same stomach section.

Coding another open operation on the stomach? CCSD code G3800 explains when open stomach operations not elsewhere classified apply.

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