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CPC STUDY COURSE · 2026 EDITION

Endoscopic carpal tunnel release completed through an open approach

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.

Confirmed condition

Fictional patient Harper North, age 56, has persistent right carpal tunnel syndrome confirmed by the treating surgeon. The symptoms and testing support median-nerve compression at the carpal tunnel. The record does not diagnose a current traumatic nerve injury, cervical radiculopathy or a left-sided condition requiring surgery today.

Planned approach

The surgeon plans an endoscopic right carpal tunnel release. The preoperative record identifies the right wrist, and the patient consents to conversion if needed. The operation is not being performed for a separate lesion elsewhere along the nerve. An independent anesthesia professional provides the anesthetic service.

Operative course

The surgeon begins the endoscopic approach but cannot obtain satisfactory visualization. For safe completion, the surgeon converts during the same encounter to an open approach at the same right wrist. The transverse carpal ligament is released under direct visualization and the median nerve is decompressed. There is no separate nerve graft, traumatic nerve repair or procedure on the opposite wrist.

Completion

The surgeon confirms the decompression and closes the operative wound. The final diagnosis remains right carpal tunnel syndrome. Routine postoperative instructions address wound care and follow-up. There is no independently documented unrelated E/M service on this operative date.

Coding desk

The charge list includes both the attempted endoscopic release and the completed open release, with a distinct-service modifier on the first. Another entry calls the converted endoscopic attempt a separately discontinued procedure. Review the same-wrist, same-encounter relationship before considering any modifier. Use the licensed entry for the technique that completed the treatment.

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 confirmed condition supports G56.01, the right-sided carpal tunnel syndrome entry. The record excludes a traumatic nerve injury; an incision during treatment does not convert chronic compression into a traumatic diagnosis.
  2. The procedure began endoscopically and was completed openly at the same wrist during one encounter. NCCI VIII C.13 specifically directs reporting only the completed open procedure in this conversion relationship.
  3. Do not add the attempted endoscopic release with a distinct-service modifier. The record contains one treatment of the same carpal tunnel, not a second independently necessary anatomical service.
  4. A separately discontinued-procedure line does not solve this conversion issue. The completed open service represents the treatment, and the specific inclusion must be applied before a modifier is considered.
  5. The incision closure and routine operative work do not automatically create additional procedures. No graft, traumatic nerve suture or opposite-wrist release is documented.
  6. Keep the approach timeline in the coding note so that the preliminary endoscopic plan can be reconciled with the final open procedure. The finished report governs the lookup.

Reference sections: NCCI VIII C.13; G56.01; ICD IV

Practice the linked chart questions

Review the lesson

Sources

  1. CMS — Medicare NCCI 2026 Chapter VIII: Nervous, Eye and Auditory Systems. 2026. Accessed 2026-09-10.
  2. CDC NCHS — ICD-10-CM April1,2026 Index and Tabular XML. April1–September30,2026. Accessed 2026-09-12.
  3. CDC/NCHS and CMS — ICD-10-CM April 1 2026 Guidelines. FY2026 April. Accessed 2026-09-10.

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