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Medical Coding: ICD-10-CM, CPT, and HCPCS
Coding translates documented diagnoses and services into standardized codes. The CBCS exam is closed-book, so you must know the code-set conventions, structure, modifiers, and sequencing rules from memory rather than looking them up.
ICD-10-CM Conventions and Guidelines
Diagnoses are located by main term (the condition) in the Alphabetic Index, then verified in the Tabular List before assignment.
A trailing dash or the note that additional characters are required means the code is incomplete; assign all required characters, using X as a placeholder when needed.
Excludes1 means two conditions are never coded together; Excludes2 means the other condition is separate and may be coded additionally.
'Code first' and 'use additional code' notes enforce etiology-then-manifestation sequencing; abbreviations NOS and NEC signal unspecified or not-elsewhere-classifiable situations.
Adherence to the ICD-10-CM Official Guidelines for Coding and Reporting is required and complements the code-set conventions.
CPT Categories and Structure
Category I codes are five-digit numeric codes for established procedures; Category II are performance-measurement tracking codes; Category III are temporary codes for emerging technology.
Add-on codes describe additional work performed with a primary procedure and can never be reported alone.
The global surgical package bundles the procedure with routine preoperative and postoperative care for a defined period.
HCPCS Level II and Modifiers
HCPCS Level II codes (a letter followed by four digits) report supplies, durable medical equipment, drugs administered other than orally, and services not found in CPT.
Modifiers add information without changing a code's core meaning: 26 (professional component), TC (technical component), 25 (separate E/M same day), 59 (distinct service), 51 (multiple procedures).
Omitting a required modifier or misusing 25 and 59 are frequent causes of denials and audits.
E/M Coding Basics
Traditional E/M level selection weighed history, examination, and medical decision making.
Current office and outpatient visits may be leveled by medical decision making or by total provider time on the date of the encounter.
Documentation must support the level of service reported.
Sequencing and Medical Necessity
The first-listed outpatient diagnosis is the condition chiefly responsible for the encounter's services.
For outpatient encounters, uncertain or 'rule-out' diagnoses are not coded as confirmed; report documented signs, symptoms, or the reason for the visit.
The diagnosis must support the procedure to establish medical necessity; upcoding and unbundling are prohibited, and NCCI edits detect improper code pairs.
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Last updated: July 2026