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CPCSTUDY COURSEMy progress

CPC STUDY COURSE · 2026 EDITION

Screening colonoscopy with one sigmoid polyp removed

Read an original fictional chart, identify the supported facts, and explain your coding workflow.

Chart gym · Original fictional record

Service date: 2026-09-08 · Professional outpatient claim; Original Medicare unless stated otherwise

Use your code books and write your reasoning before opening the walkthrough. This exercise contains no real patient information.

Screening history

Fictional patient Alma Reed, age 68, presents for an average-risk colorectal cancer screening colonoscopy. She reports no rectal bleeding, anemia, bowel change, unexplained weight loss or abdominal pain. There is no personal history of colorectal neoplasia and no relevant family history. This is not a follow-on colonoscopy after a positive stool or blood-based screening test. The packet states that applicable Medicare screening eligibility and frequency requirements are met.

Procedure preparation and extent

The gastroenterologist confirms the screening purpose and obtains consent. Bowel preparation is adequate. The colonoscope is advanced through the colon to the cecum, identified by the documented landmarks, and the mucosa is examined during withdrawal. There is no incomplete or discontinued examination. An independently reporting anesthesia professional manages sedation; the gastroenterologist does not provide a separate moderate-sedation service.

Polyp technique

One 6 mm sessile polyp is found in the sigmoid colon. The endoscopist takes a small cold-forceps tissue sample from that lesion and then removes the same lesion completely with a cold snare. Both samples are labeled as portions of the same sigmoid polyp. No separate lesion is biopsied and no second polyp is removed. There is no separately treated bleeding site, dilation, ablation or other therapeutic intervention.

Final documentation

The pathology report identifies a tubular adenoma without high-grade dysplasia or malignancy. The endoscopist reviews the result and signs the final diagnosis as benign adenoma of the sigmoid colon. The record is complete before the coding exercise. The patient receives the procedure findings and routine discharge and follow-up instructions; no unrelated separate E/M problem is evaluated on the procedure date.

Professional coding request

Prepare the endoscopist’s claim reasoning for the completed service. Address the original screening purpose, the discovered diagnosis, the actual snare removal and the same-polyp forceps sampling. The draft contains the original screening-only procedure, a snare procedure and a separate biopsy with a distinct-service modifier. Determine which service relationship is supported and whether the Medicare screening-conversion modifier applies. Do not report the anesthesia professional’s work as the endoscopist’s service.

Your coding worksheet

  1. Identify the reason for this encounter and the supported diagnoses.
  2. List the services actually completed and the applicable code sets.
  3. Use your books to select final codes, units and any supported modifiers.
  4. Sequence the diagnoses and explain the relevant instruction.
  5. Review included work and any separate coverage question. Explain why the strongest alternative does not fit.

In your notebook, record the supported facts, your index route, the instructions you checked, and any missing detail that limits your answer.

Write your answer

Use only this fictional record. Your entries stay on this page and disappear when you leave or reload. Do not enter real patient information.

Compare with the worked explanation
  1. The encounter began as asymptomatic screening and the packet confirms eligibility. Under the cited screening guideline, verify Z12.11 as the first-listed reason and add the condition found. This is not a diagnostic examination initiated because of symptoms.
  2. The final provider-adopted diagnosis is a benign sigmoid adenoma. Follow Adenoma to the benign-neoplasm-by-site route and verify D12.5. Do not code malignancy or uncertain behavior; the completed result does not support either.
  3. The completed therapeutic technique is snare removal. Use the complete licensed colonoscopy entry and its current instructions. The diagnostic examination is part of the completed therapeutic procedure relationship.
  4. The forceps sample came from the very same polyp subsequently removed by snare. NCCI VI H.23–25 does not support a separately reported same-lesion biopsy. A distinct-service modifier cannot create a separate lesion.
  5. For the Medicare screening-to-therapeutic conversion, apply the appropriate actual-procedure reporting and PT under the cited claims instruction. Do not also bill the original screening-only procedure as another completed service.
  6. The packet explicitly excludes a positive noninvasive screening test, so it does not establish the follow-on-test KX circumstance. Sedation belongs to the independently reporting anesthesia professional in this record; no operator sedation time or service is supplied.
  7. The exact CPT choice remains a licensed-book answer. Your complete worksheet should contain that choice, the supported modifier and the screening/finding sequence, with an explanation of why the same-lesion biopsy and duplicate screening procedure are excluded.

Reference sections: Z12.11,D12.5; guidelines I.C.21.c.5; NCCI VI H.23–25; CMS60.1.1–60.2

Practice the linked chart questions

Review the lesson

Sources

  1. CDC NCHS — ICD-10-CM April1,2026 Index and Tabular XML. April1–September30,2026. Accessed 2026-09-12.
  2. CDC/NCHS and CMS — ICD-10-CM April 1 2026 Guidelines. FY2026 April. Accessed 2026-09-10.
  3. CMS — Medicare NCCI 2026 Chapter VI: Digestive System. 2026. Accessed 2026-09-10.
  4. CMS — Transmittal 13921: Colorectal Cancer Screening / CR14581. Issued August27/2026; effective June8/2026; implementation January4/2027. Accessed 2026-09-10.

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