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Brackets [ ] in Medical Coding: Purpose, Rules, and Practical Examples

In ICD-10-CM/PCS and CPT® codebooks, square brackets [ ] are editorial conventions—not part of the code itself—that convey critical instructions for accurate code selection.

Primary Functions of Brackets

1. Non-Essential Clarifying Information

Words in brackets provide additional clinical detail that refines the description but are not required for code assignment.

Example: M17.11 [Primary] osteoarthritis, right knee — "Primary" clarifies etiology but does not change the code.

2. Missing or Uncertain Information

Brackets indicate a specific detail (laterality, severity, etiology) is absent from documentation; the coder must query the provider or use clinical judgment.

Example: S72.001A Fracture of [unspecified] neck of right femur

3. Unspecified Laterality

When the record does not state left/right, brackets flag the default "unspecified" option.

Example: M25.50 Pain in [unspecified] joint

4. Quantity, Measurement, or Anatomical Detail

Brackets enclose values specifying extent, size, or location for precise reporting.

Common Clinical Examples

Code Presentation	Interpretation
[Left] Total knee arthroplasty	Procedure performed on left knee; laterality confirmed.
Percutaneous coronary intervention [3 lesions]	Three lesions treated; affects RVU/units.
Lumbar puncture [L3-L4]	Interspace identified.
Fracture of humerus [distal third]	Specific fracture location.

Best Practices

• Never include bracketed text on claim forms—only the code and its official description.
• Query the provider when bracketed information is missing but required for specificity.
• Use the "unspecified" code only when information is truly unavailable after query.

Understanding bracket conventions prevents coding errors, denials, and audit findings.