Navigate ICD-10-CM/CPT coding for endoscopic procedures of the colon and rectum

August 23rd, 2021

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Note:  The following article synopsis was NOT provided by HCPro. It was created by Find-A-Code/innoviHealth.

Article Overview

This article is a refresher for hospital coders working with colorectal complaints and endoscopic procedures of the colon and rectum. It covers broad anatomy of the large intestine, common ICD-10-CM diagnosis categories tied to colorectal findings, and general CPT/HCPCS reporting themes for proctosigmoidoscopy, sigmoidoscopy, and colonoscopy, including screening, diagnostic, and therapeutic contexts. The article is aimed at coders, billing staff, and other revenue cycle professionals who need a topical overview of how these services are discussed in coding guidance.

Why This Topic Matters

Colorectal symptoms and endoscopic procedures are common in both inpatient and outpatient settings, so understanding the relevant code families and reporting framework helps coders evaluate charts and recognize which guidance applies.

Article Sections

  1. Anatomy

    An overview of the large intestine and its major parts to support understanding of the procedures discussed later in the article.

  2. ICD-10-CM coding for colorectal conditions

    A review of common colorectal diagnoses and the ICD-10-CM categories associated with them.

  3. CPT coding for colorectal procedures

    A discussion of lower gastrointestinal endoscopic procedure types and the code families used to report them.

  4. Screening colonoscopy

    General reporting guidance for screening colonoscopy scenarios in outpatient or ambulatory settings.

  5. Diagnostic colonoscopy

    General reporting guidance for diagnostic colonoscopy scenarios when symptoms or findings are present.

  6. Therapeutic colonoscopy

    General reporting guidance for therapeutic or surgical colonoscopy scenarios and related code families.

What You Will Learn

  • How the article frames colorectal anatomy in relation to coding
  • Which broad ICD-10-CM diagnosis groupings are discussed for large intestine conditions
  • How the article distinguishes between proctosigmoidoscopy, sigmoidoscopy, and colonoscopy reporting
  • What general topics are covered for screening, diagnostic, and therapeutic colonoscopy coding
  • Which coding organizations, settings, and guidance sources are referenced

Who Should Read This

  • Hospital coders
  • Outpatient coders
  • Revenue cycle staff
  • Coding educators
  • Billing professionals

Codes Discussed

  • ICD-10-CM: K63.5
  • ICD-10-CM: C18.-
  • ICD-10-CM: K58.9
  • ICD-10-CM: K92.1
  • ICD-10-CM: K62.5
  • ICD-10-CM: K51.4-
  • CPT: 45300
  • CPT: 45327
  • CPT: 45330
  • CPT: 45350
  • CPT: 45378
  • CPT: 45331
  • CPT: 45347
  • CPT: 45379
  • CPT: 45398
  • HCPCS Level II: G0104
  • HCPCS Level II: G0105
  • HCPCS Level II: G0121

Code Ranges Discussed

  • CPT: 45300-45327
  • CPT: 45330-45350
  • CPT: 45331-45347
  • CPT: 45379-45398

Modifiers Discussed

  • CPT: -33
  • CPT: -PT
  • CPT: -53
  • CPT: -52

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