CCSD code H3334 – Low anterior resection

Key takeaways

CCSD code H3334 covers an open low anterior resection, with the colorectal anastomosis at or below the peritoneal reflection. A join above the reflection is a high anterior resection, H3332.

The code changes with the surgical approach. A laparoscopic low anterior resection is H3365, a robotic-assisted one is H3368 or H3373, and the Bupa fee changes too.

Total mesorectal excision (TME) is not bundled into H3334. It has its own codes: H3384 open, H3385 laparoscopic, H3386 transanal and H3383 robotic-assisted.

The most common denial reason is a missing anastomosis level in the operative note. State ‘colorectal anastomosis at or below the peritoneal reflection’ explicitly.

Pabau, our practice management software, keeps the CCSD code, diagnosis and authorisation number on one claim record. It then sends the claim to UK insurers through Healthcode.

CCSD Code H3334: Definition and clinical scope

CCSD Code H3334 covers an open anterior resection of the rectum in which the colorectal anastomosis is formed at or below the peritoneal reflection.

The Clinical Coding & Schedule Development (CCSD) schedule lists it in Chapter 11 (Abdomen), under Rectum / Anus. Bupa places it in complexity band CMO 3.

Two facts decide whether H3334 is the right code: the level of the anastomosis and the surgical approach. A join above the reflection is a high anterior resection, H3332. Laparoscopic and robotic low resections have codes of their own, and so does total mesorectal excision. Our CCSD guides for surgeons cover other Chapter 11 procedures, from colectomy to ileostomy.

In clinical practice, H3334 is most often performed for mid- and low-rectal cancer. Other indications include complicated sigmoid diverticular disease and large benign rectal tumours that local excision cannot remove.

The operative note must show a rectal resection with pelvic dissection, a colorectal join at or below the anterior peritoneal fold, and an open approach.

What a low anterior resection involves: Surgical steps for coders

Understanding the operative steps helps coders find, and verify, the language they need in an operation note before submitting an H3334 claim.

• Sigmoid and upper rectal mobilisation: The sigmoid colon is freed from its lateral attachments and the inferior mesenteric vessels are divided. The left colon is mobilised to give enough length for a tension-free anastomosis.
• Pelvic dissection: The rectum is dissected in the avascular plane behind the mesorectum, into the true pelvis. For mid- and low-rectal cancer this is often a total mesorectal excision (TME), which carries its own CCSD codes.
• Division at or below the peritoneal reflection: The rectum is divided at or below the anterior peritoneal fold, which confirms the low level. The surgeon records the exact point, and it must appear in the note.
• Colorectal anastomosis: The colon is joined to the rectal stump, most commonly with a circular stapling device inserted through the anus. The anastomosis height above the anal verge is usually recorded in centimetres.
• Integrity testing: The join is tested during the operation, usually by insufflating air through the anus under saline, to confirm it is watertight. The Bupa schedule has no separate code for this step.
• Defunctioning stoma (where applicable): A temporary loop ileostomy may be created in the same episode for a high-risk anastomosis. Typical reasons are a very low pelvic join or pre-operative radiotherapy.

Clinical indications and ICD-10 codes that support H3334

UK private medical insurers require a diagnosis code to accompany H3334 at claim submission. The table below lists the main indications with the ICD-10 codes commonly used in UK private practice. Check each code against the current NHS Classifications Browser before submission, as annual updates apply.

For UK private billing, the diagnosis code must match the indication confirmed by histology or imaging before surgery. Insurers cross-reference the diagnosis against the staging investigations in the pre-authorisation record, particularly for rectal cancer.

The peritoneal reflection threshold: How ‘at or below’ is determined

The peritoneal reflection is where the peritoneum folds from the pelvic wall onto the front of the rectum, forming a recognizable shelf in the pelvis. An anastomosis at or below this fold is a low anterior resection; one above it is a high anterior resection.

The position of the reflection varies with sex, body habitus, and prior pelvic surgery or radiotherapy. The surgeon identifies it under direct vision during the operation, so no fixed distance from the anal verge defines a low join.

A note that cites only the anastomosis height, such as “anastomosis at 6 cm”, gives insurers grounds to query the code level.

Open, laparoscopic and robotic: How the approach changes the code

H3334 is the open-approach code. The Bupa CCSD schedule gives each approach to a low anterior resection its own code, and the fee can change with it. A laparoscopic or robotic case billed as H3334 is miscoded, even where the fee happens to match.

Figures come from Bupa’s 2026 CCSD schedule, and our Bupa CCSD codes guide explains how it is organised. AXA Health, Aviva and other insurers set their own fees for the same codes.

Bupa lists two robotic codes for a low resection. H3368 describes a robotic-assisted laparoscopic resection, while H3373 describes a robotic-assisted resection with or without a stoma. Check which one the insurer expects, and never add a separate stoma code to H3373.

A laparoscopic or robotic case sometimes converts to open. Record the point of conversion and the reason in the operative note. Then confirm with the insurer whether it wants the open or the minimally invasive code for that claim.

Does H3334 include total mesorectal excision?

No. The Bupa CCSD schedule lists TME as a procedure in its own right, with a code for each approach. They are H3384 open, H3385 laparoscopic, H3386 transanal and H3383 robotic-assisted. The schedule does not bundle TME into H3334.

TME is the standard operation for mid- and low-rectal cancer, as set out by the Association of Coloproctology of Great Britain and Ireland (ACPGBI). So a rectal cancer resection may fit a TME code better than an anterior resection code.

Billing a TME code and an anterior resection code for one operation invites an unbundling query. Bill one primary code unless the insurer confirms in writing that it accepts the pair.

How to pick the right code

1. Check for a TME. If the operative note records a total mesorectal excision, start from the TME codes, H3383 to H3386.
2. Check the anastomosis level. At or below the reflection points to a low resection, above it to a high resection (H3332 open). No anastomosis, with the rectum and anus removed, is an abdominoperineal resection (H3320 open).
3. Match the approach. Open is H3334, laparoscopic is H3365, and robotic-assisted is H3368 or H3373.
4. Check conversions and stomas. Record any conversion to open, and leave out a separate stoma code when billing H3373.
5. Confirm the doubtful cases. Where two codes could fit, ask the insurer before submission and note its answer on the claim.

The flow below runs the same three checks in order, with the Bupa category and fee for each low resection code.

H3334 vs neighbouring CCSD codes: Avoiding common confusion

Beyond the approach variants, two open-approach codes are easily confused with H3334. The table below compares them. Selecting the wrong level is the second most common denial trigger after poor documentation.

The H3334 vs H3320 distinction also arises when a planned low anterior resection converts to an abdominoperineal resection (APR). This happens when a safe distal margin and anastomosis cannot be achieved, usually because the tumour sits close to the sphincters.

The claim must then reflect the operation performed: H3320 for an open APR, H3322 laparoscopic or H3324 robotic. The operative note must record the decision to convert and the clinical reason.

Commonly co-billed codes with CCSD Code H3334

A few additional procedures are legitimately performed in the same episode as a low anterior resection. Each needs its own supporting documentation in the operative note.

Bundling rules vary by CCSD edition and by insurer. The CCSD technical guide (October 2025) sets out the general unbundling principles.

Confirm the co-billing position with the insurer before submitting, particularly for stoma codes, which some insurers treat as included in the resection fee. For a laparoscopic loop ileostomy, our G7403 guide covers the stoma side of the claim.

Operative note documentation required for CCSD Code H3334

The operative note is the primary clinical record behind an H3334 claim. When insurers query an H3334 claim, they usually point to the same few details missing from the note. Structured digital templates for the operative note make it harder to skip a mandatory element.

Every H3334 operative note must include the following:

• Explicit anastomosis level statement: “Colorectal anastomosis formed at [X] cm from the anal verge, confirmed at or below the anterior peritoneal reflection.” This decides between H3334 and H3332.
• Surgical approach: Open, laparoscopic or robotic, plus any conversion and its reason. The approach decides between H3334, H3365, H3368 and H3373.
• TME documentation (cancer cases): State whether a total mesorectal excision was performed and describe the plane of dissection. A recorded TME points to the TME codes, H3383 to H3386.
• Distal resection margin: Distance from the distal tumour edge to the staple line, recorded in millimetres.
• Anastomotic integrity test result: The method used and whether the join was airtight on testing.
• Stoma formation: If a defunctioning loop ileostomy was created, state its type, position and clinical indication.
• Intraoperative complications: Any conversion decision, bleeding control or unexpected finding that altered the planned procedure.

Pre-authorisation requirements for H3334

Most UK private medical insurers treat low anterior resection as a major elective colorectal procedure that needs pre-authorisation before the patient is listed. Surgeons moving into private practice from the NHS often underestimate this step, particularly for cancer cases that need staging information upfront.

The pathway typically follows these steps, though requirements vary by insurer. Always check directly with the relevant insurer before proceeding.

• Specialist referral: A written GP or specialist referral confirming the clinical indication and the proposed procedure. Some insurers require the referral to name the code or use a recognised clinical description.
• Code for the planned approach: Pre-authorise the code that matches the planned approach, such as H3334 open or H3365 laparoscopic. If the plan changes, tell the insurer before the claim goes in.
• Diagnosis confirmation: For rectal cancer, staging investigations (CT, pelvic MRI and any PET-CT) must be complete and available to the insurer. The Bupa procedure code search portal shows the current pre-authorisation status for Bupa policyholders.
• MDT discussion (cancer cases): Evidence of multidisciplinary team discussion and a recommendation for resection, aligned with ACPGBI guidelines.
• Insurer-specific forms: AXA Health, Aviva and Vitality each use their own pre-authorisation forms. The Aviva fee schedule and provider guidelines set out its requirements for major colorectal procedures.
• Authorisation number: Record it before the procedure date and include it on the invoice. Claims without a valid authorisation number are routinely rejected.

Why CCSD Code H3334 claims get denied, and how to prevent it

Claim denials for H3334 follow predictable patterns. The table below maps the most common denial reasons to prevention steps for billing teams and surgical secretaries.

Systematic claim tracking through private practice billing software cuts the time spent chasing denials. It also creates an audit trail that supports resubmission with the right documents.

How Pabau supports H3334 billing through Healthcode

Many colorectal practices still track claims across operation notes, spreadsheets and insurer portals. Each handoff is a chance to lose the authorisation number or key in the wrong approach code.

Pabau’s billing software keeps the CCSD code, the ICD-10 diagnosis and the authorisation number on one claim record. You submit the claim through Healthcode and track its status in the same place. Pabau does not choose the code, so the approach and TME checks above still apply.

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Conclusion

H3334 fits one operation only: an open low anterior resection with the join at or below the peritoneal reflection. Change the approach and the code changes with it. Record a total mesorectal excision and the TME codes come into play.

The code is effectively chosen in the operating room, when the surgeon writes the note. A note that states the anastomosis level, the approach and any TME lets the billing team pick the code with confidence.

Check those three facts before each claim leaves the practice. To see how Pabau keeps the code, diagnosis and authorisation number on one claim, book a demo.

Continue your research

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Checking what Bupa pays for other colorectal codes? The Bupa procedure codes and fee schedule guide links each code to its published fee so you can spot shortfalls before you invoice.

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