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CAMC Part 1 Exam study materials
CAMC Part 1 Exam study resources

CAMC Part 1 Exam: ICD-10-PCS and CPT Procedure Coding Fundamentals

CAMC Part 1 Exam · Work through your exam, one topic at a time.

All guide sections

ICD-10-PCS and CPT Procedure Coding Fundamentals

This domain covers how procedures are described and coded. If your exam version uses ICD-10-PCS, expect the seven-character system and its root operations; if it uses CPT, expect the section hierarchy, code formats, and modifiers. Both reward the same skill: reading the operative report for approach, site, technique, and extent.

ICD-10-PCS

  • Seven characters, each with a fixed meaning: Section, Body System, Root Operation, Body Part, Approach, Device, Qualifier.
  • Use the index to find the term, then go to the correct table; never build a code from the index entry alone.
  • Approach values include 0 open, 3 percutaneous, 4 percutaneous endoscopic, 7 via natural or artificial opening, 8 via natural or artificial opening endoscopic, X external.
  • Device Z means no device remains at the end of the procedure. No not-otherwise-specified option exists: if the detail is undocumented, query.
  • Learn the contrast pairs: excision (partial removal) versus resection (complete removal); incision versus drainage; release versus division; repair versus supplement; restriction versus occlusion; transfer versus reposition; detachment for amputation.

CPT

  • Category I codes are five digits; Category II codes are four digits plus F for performance tracking; Category III codes are four digits plus T for emerging technology.
  • The Surgery section is ordered by body system, so lesion size, site, and depth of repair drive code choice. Add-on codes (+) are never reported alone.
  • Modifiers that matter most: 26 professional component and TC technical component; LT, RT, 50 for laterality and bilateral; 25 for a significant, separately identifiable E/M service; 59 and X{EPSU} for distinct services; 58, 78, 79 for staged, related, and unrelated procedures; 76 and 77 for repeat procedures; 57 for the decision for surgery.

Worked example

Laparoscopic cholecystectomy. In PCS: Section 0 (Medical and Surgical), Body System F (Hepatobiliary System and Pancreas), Root Operation T (Resection, because the entire gallbladder is removed), Body Part 4 (gallbladder), Approach 4 (percutaneous endoscopic), Device Z, Qualifier Z - 0FT44ZZ. In CPT the same service is 47562. The lesson: PCS describes the root operation performed on the body part; CPT describes the named procedure and technique.

Traps that cost marks

  • Selecting excision when the entire organ was removed - that is resection.
  • Missing the endoscopic approach when the scope entered through the skin.
  • Adding a device character when nothing was left in place.
  • Unbundling a CPT procedure into its components.
  • Appending modifier 59 to defeat an NCCI edit instead of confirming the services were truly distinct.