CPT code 44143 – Colectomy with end colostomy

Key takeaways

CPT 44143 describes an open partial colectomy with end colostomy and closure of the distal segment, the Hartmann type procedure.

The laparoscopic version of the same operation is reported with CPT 44206, so 44143 applies only to an open approach.

Colostomy creation is bundled into 44143 under NCCI edits, and billing it separately is the most common denial trigger for this code.

A 90-day global period applies, so related post-op visits in that window are part of the surgical payment.

Pabau, the practice management platform we build, checks CPT and ICD-10 pairings and flags NCCI conflicts before a 44143 claim reaches the payer.

CPT code 44143: Official descriptor and procedure overview

CPT code 44143 covers an open partial colectomy with an end colostomy and closure of the distal bowel segment. The surgeon removes a segment of the colon, brings the proximal end out as a colostomy, and staples or oversews the distal end.

The American Medical Association’s CPT code set places 44143 in the Surgery/Digestive System section, alongside colectomy codes 44140 through 44147. Within that range, CPT 44145 is the open resection that joins the colon to the rectum low in the pelvis.

No anastomosis is created, and the closed distal segment usually stays in the pelvis as a rectal stump. That pairing of an ostomy and a closed stump separates 44143 from 44140, which reconnects the bowel. It also separates it from 44144, where a colostomy or ileostomy is created along with a mucofistula.

CPT 44143 vs. 44144 vs. 44140: Choosing the right code

Code selection in this family depends entirely on what was created at the distal end of the bowel and whether an ostomy was formed. These are the codes coders confuse most often, and a wrong pick leads to a denial or a post-payment audit.

The operative report is the deciding document, and the diagram below maps each outcome to its code. If the surgeon creates an end colostomy and leaves the distal segment as a closed stump without anastomosis, 44143 is correct.

If a colostomy or ileostomy is created with a mucofistula, use 44144 instead. If the bowel is reconnected end-to-end or end-to-side, use 44140.

Open vs. laparoscopic approach

CPT code 44143 is open-only. A laparoscopic colectomy with end colostomy and closure of the distal segment is reported with CPT 44206. A laparoscopic colostomy made without removing any colon is a separate service, billed as CPT 44188. When a case starts laparoscopically and converts to open, report the open code (44143) and document the reason for conversion.

Add modifier -22 only when the note shows substantially increased work. Never report both the laparoscopic and open codes for the same session.

Hartmann procedure and CPT code 44143: Why this code applies

The Hartmann procedure is the textbook case for CPT code 44143. Surgeons choose it for perforated diverticulitis, obstructing sigmoid cancer, and emergencies where an anastomosis would risk a leak.

Coders working a Hartmann operative report should verify four elements before assigning 44143:

• The operative note confirms an open incision, not a laparoscopic approach
• A segment of colon was resected with defined proximal and distal margins
• The proximal end was exteriorized as an end colostomy and matured to skin
• The distal segment (rectal stump) was stapled or sutured closed rather than anastomosed

Auditors focus on the rectal stump documentation. The operative report must state explicitly how the distal segment was managed. “Stump oversewn with 3-0 Vicryl and left in the pelvis” satisfies payer requirements.

A report that describes the resection and colostomy but never mentions the distal segment is incomplete for 44143. Expect a documentation request or a denial.

Hartmann reversal, which reconnects the colon to the rectal stump, is a separate encounter. It is coded to 44626 or 44625, depending on the technique. Reversal codes never go on the original 44143 claim.

ICD-10 codes that support medical necessity for 44143

Diagnosis-procedure mismatch is a frequent cause of 44143 denials. Every claim needs at least one ICD-10-CM code that supports medical necessity for a partial colectomy with colostomy. The diagnoses below are the usual indications for a Hartmann type resection, in line with AAPC coding guidance.

Code to the highest level of specificity the documentation supports. A diagnosis of “diverticulitis” with no perforation, abscess or bleeding maps to K57.32. Without the complication documented, payers may question why a colostomy was needed. When a nontraumatic perforation without diverticular disease drove the surgery, K63.1 carries the medical necessity.

Modifiers for CPT code 44143: When and how to use them

Modifier selection errors are a fast path to denial or post-payment recovery for 44143. Each modifier requires specific operative documentation to survive a payer audit.

Modifier -22 draws more payer scrutiny than any other modifier on colorectal surgery claims. Payers expect a letter of medical necessity with measurable factors. Typical evidence is operative time well above the usual for the code, a documented BMI where obesity is cited, or radiology confirming prior pelvic radiation. Appending -22 to every complex colectomy without that support invites post-payment audits.

Medicare reimbursement: RVUs and the global package

CPT code 44143 carries a high work relative value unit (RVU) assignment, reflecting open colorectal surgery with ostomy creation. Use the CMS Medicare Physician Fee Schedule lookup tool to find the current-year total RVU and national unadjusted payment for 44143. CMS updates these values every year, and geographic adjustment factors (GPCI) change the final payment by locality.

The reimbursement figure consists of three RVU components:

• Work RVU: Reflects physician time and intensity, and is the largest component for a major surgical code
• Practice expense RVU: The facility rate applies in a hospital or ASC, which is where this procedure is performed
• Malpractice RVU: Professional liability component

Underpayment on this code usually comes from a mismatched place-of-service code, which moves the claim onto the wrong rate. A medical claims clearinghouse such as Claim.MD should flag that mismatch before the claim reaches Medicare.

The 90-day global surgery package

CMS assigns a 90-day global period to CPT 44143. Under Medicare’s global surgery package, the surgical payment covers related pre-operative services from the day before surgery.

It also covers routine post-operative care for 90 days after. An evaluation and management visit in that window for a problem related to the surgery is denied if billed separately.

These services stay separately billable within the global period:

• Management of an unrelated condition, with modifier -24
• An unrelated procedure during the post-operative period, with modifier -79
• Care by a different physician who was not involved in the surgery

Stoma care education from a registered nurse is not billable under the physician’s global package. Depending on the payer, it may be billable under nursing or outpatient facility rules.

Documentation requirements: What the operative report must include

Accurate coding for CPT code 44143 starts with a complete operative report. Missing elements lead to downcoding to 44140 or to an outright denial on post-payment audit. Every op report for 44143 must document:

• Surgical approach confirmed as open (laparotomy incision type and length)
• Anatomic segment of colon resected (e.g. sigmoid, left colon, descending colon) with proximal and distal margins
• Creation and maturation of the end colostomy to skin, including ostomy location
• Distal segment management: Explicit statement that the rectal stump was stapled or sutured closed (not anastomosed)
• Concurrent procedures performed and instruments used (e.g. EEA stapler size, staple line reinforcement)
• Pathology specimen labeled and sent

A clean claim for a complex surgical code answers the reviewer’s questions before they request the medical record. A structured dictation template for colectomy makes a missing stump note or approach easy to spot before submission. Check your medical billing compliance protocols to confirm operative note standards meet current payer requirements.

NCCI edits and bundling rules

The National Correct Coding Initiative (NCCI) bundles several related procedure codes into CPT 44143. Billing these codes separately without a valid modifier is a certain denial and, if done repeatedly, a compliance risk. Pabau’s claims management software flags NCCI edit conflicts before the claim reaches the payer.

Codes bundled into 44143 (not separately billable)

• Colostomy creation codes such as 44320, because the colostomy is part of 44143
• Bowel anastomosis codes, since 44143 involves no anastomosis and any anastomosis code billed with it is denied
• Enterotomy closure when incidental to the resection
• Wound closure (layered closure is included in any major surgical code)

Codes that may be separately billable

• Lysis of adhesions (44005), when extensive adhesiolysis is the primary indication and is documented apart from the resection, with modifier -51
• Liver biopsy (47100), when performed for an independent indication, with modifier -51 on the secondary code
• Intraoperative colonoscopy, when performed for diagnostic purposes beyond the resection itself

Unbundling a code that NCCI would otherwise bundle takes modifier -59 (distinct procedural service) or an X{EPSU} modifier. The documentation must show a different session, procedure, site or indication. Modifier -59 without that support is one of the most audited modifier patterns in colorectal surgery.

Top claim denial reasons and how to prevent them

Most 44143 denials trace back to the six causes in the table below, each with its fix. Denial management workflows catch them before the claim goes out. Knowing the medical billing denial codes attached to each cause helps billing staff write targeted appeals.

Emergency colorectal surgery often skips the standard prior authorization workflow. Many commercial payers expect notification within 24 to 48 hours of an emergency admission. Missing that window turns a payable claim into a technical denial that has nothing to do with the coding, and it needs its own appeal.

How Pabau keeps 44143 claims clean from op note to payment

A 44143 claim usually passes through three sets of hands. The surgeon dictates, a coder reads the op note, and a biller keys the codes into a clearinghouse portal. Each handoff is another chance to miss the stump closure or add a bundled colostomy code.

In Pabau, the CPT code, ICD-10 diagnoses and modifiers sit on the patient record, and claims go out through the Claim.MD integration. Pabau checks CPT and ICD-10 pairings and flags NCCI conflicts before the claim leaves the practice.

The result is fewer rejected colectomy claims and less time spent appealing a 90-day global payment that should have paid the first time.

Reduce surgical claim denials with smarter billing workflows

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Conclusion

For 44143, the claim turns on what the operative report says about the distal bowel. Get surgeons to document the open approach, the end colostomy and the stump closure every time. That removes the causes behind most denials on this code.

Start with a dictation template that asks for those three facts, then run every colectomy claim through an NCCI check before it goes out. A few extra minutes per case costs far less than a large surgical payment stuck in appeal. Book a demo to see how Pabau catches 44143 coding conflicts before your claims reach the payer.

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