Colorectal Surgery Billing Services

Colorectal surgery billing covers two very different kinds of work. One is endoscopy, mainly colonoscopy for screening and polyp removal. The other is operative care, such as colon resection, ostomy surgery, and anorectal procedures like hemorrhoid and fistula treatment.

The endoscopy side raises questions about screening versus diagnostic status, since that changes patient cost sharing. The surgical side brings global periods and modifiers. Many anorectal procedures carry a 10-day or 90-day global period. A colorectal surgery billing company must handle both, and also coordinate with the facility, anesthesia, and pathology claims that surround each case.

Who this is for

• Colon and rectal surgeons in private practice
• Surgeons who split time between hospitals and endoscopy centers
• Groups that treat inflammatory bowel disease surgically
• Practices with in-office anorectal procedures
• Surgeons who partner with gastroenterologists and oncologists

What gets billed

• Screening and diagnostic colonoscopy
• Polyp removal during colonoscopy
• Partial and total colectomy, open or laparoscopic
• Colostomy and ileostomy creation and takedown
• Hemorrhoid banding and hemorrhoidectomy
• Anal fistula and abscess surgery
• Anal fissure treatment
• Rectal prolapse repair
• Office consults and pre-operative visits
• Post-operative visits within the global period

Commonly billed codes

Code	Type	What it covers
45378	CPT	Diagnostic colonoscopy
45380	CPT	Colonoscopy with biopsy
45385	CPT	Colonoscopy with polyp removal using a snare
44140	CPT	Partial colon removal with reconnection
44204	CPT	Laparoscopic partial colon removal with reconnection
44320	CPT	Creating a colostomy
46221	CPT	Hemorrhoid removal by rubber band
46260	CPT	Removal of internal and external hemorrhoids, two or more groups
46040	CPT	Drainage of a deep abscess near the rectum
Z12.11	ICD-10-CM	Encounter for colon cancer screening
K57.32	ICD-10-CM	Diverticulitis of the large intestine without hole, abscess, or bleeding
K60.3	ICD-10-CM	Anal fistula

Note

Codes are examples for orientation, not a complete list, and do not guarantee coverage or payment. Always check current code sets and payer policy.

Billing challenges in colorectal surgery

Screening that becomes diagnostic. If a polyp is found during a screening colonoscopy, the claim usually changes how it is reported. Medicare uses modifier PT, and many commercial payers use modifier 33. A biller experienced in colorectal surgery checks each payer's rule so patients are not billed incorrectly.

Patient cost sharing. Medicare has been phasing down coinsurance for colonoscopies that start as screening and become therapeutic. The schedule changes over several years, so billers check the current-year rules.

Choosing the right colonoscopy code. The highest-value code depends on what was done, such as biopsy, snare, or more than one technique. Billers apply endoscopy hierarchy rules and avoid unbundling.

Global periods for anorectal procedures. Office procedures may carry 10 or 90-day globals, so a same-day visit usually needs modifier 25 or 57 to be paid. Billers pick the right modifier from the note.

Colectomy and ostomy combinations. Resections with an ostomy, or a takedown at a later date, can involve staged or related procedures. Billers use modifiers such as 58 or 78 only when the documentation fits.

Pathology and facility alignment. The claim should match pathology findings and the facility record. Billers reconcile them to prevent diagnosis mismatches.

Prior authorization for elective surgery. Many payers require approval for elective bowel and anorectal surgery. Billers confirm requirements before the date of service.

How Westmont can help

• Matches your practice with vetted medical billing experts who work with colorectal surgeons
• Connects you with end-to-end revenue cycle support, from charge capture to posting
• Helps you find denial management support for screening and modifier denials
• Connects you with credentialing support for new surgeons and endoscopy sites
• Provides a way to request a quote that fits your volume

Frequently asked questions

Why did a screening colonoscopy turn into a patient bill?

When a polyp is removed or a biopsy is taken during a screening colonoscopy, the service may be reported as diagnostic or therapeutic. Cost sharing can then apply, depending on the payer and plan. Modifier PT or 33 is often used to show the screening intent. Rules differ, so check each payer.

What modifier do I use for a same-day visit and procedure?

For a minor procedure with a 0 or 10-day global, a separate visit that stands on its own usually needs modifier 25. For a visit that leads to a major operation, modifier 57 is generally used. Notes should clearly show the visit goes beyond the usual pre-procedure work.

How are hemorrhoid procedures billed?

The code depends on the method and the extent of the work, such as banding or surgical removal of one or more groups. Documentation of the location and number of hemorrhoids matters. Many payers also review medical necessity, so notes on symptoms and prior treatment help.

Do ostomy supplies get billed by the surgeon?

Usually not. Ostomy supplies are generally billed by suppliers or by the facility, depending on the setting. Surgeon claims cover the procedure and visits. A biller confirms who bills what so supplies are not included on the wrong claim.

What does a colorectal surgery billing company handle?

It can cover charge entry, coding review, claim submission, payment posting, follow-up on unpaid claims, and appeals. For colorectal practices, close attention goes to colonoscopy status, global periods, and modifier use. Scope varies by arrangement, so confirm tasks and reports up front.

Related billing services

• General Surgery
• Gastroenterology
• Surgical Oncology
• Ambulatory Surgery Centers (ASC)
• Pathology
• Anesthesiology (incl. CRNA)