Each month, this section will feature an example of how ICD-9 codes will
translate to ICD-10 codes. We will present coding examples from different
specialties and popular disease categories to demonstrate the granularity that
the new ICD-10 code set will provide.
CONDITIONS: CENTRAL CORNEAL ULCER AND MALIGNANT NEOPLASM OF LOWER-OUTER
QUADRANT OF FEMALE BREAST
"Laterality" (side of the body affected) is a new coding convention added to
relevant ICD-10 codes to increase specificity. Designated codes for conditions
such as fractures, burns, ulcers, and certain neoplasms will require
documentation of the side/region of the body where the condition occurs.
In ICD-10, laterality code descriptions include right, left, bilateral, or
Right side = character 1;
Left side = character 2;
Bilateral = character 3;
Unspecified side/region = character 0 or 9 (depending on whether it is a 5th or
The tables below compare the lack of specificity in ICD-9 to the greater level
of specificity in ICD-10 when coding a corneal ulcer and female breast cancer.
Central Corneal Ulcer
- 370.03 Central corneal
- H16.011 Central corneal
ulcer, right eye
- H16.012 Central corneal
ulcer, left eye
- H16.013 Central corneal
- H16.019 Central corneal
Malignant Neoplasm of Lower-Outer Quadrant of Female Breast
- 174.5 Malignant neoplasm
of lower-outer quadrant of female breast
- C50.511 Malignant
neoplasm of lower-outer quadrant of right female breast*
- C50.512 Malignant
neoplasm of lower-outer quadrant of left female breast*
- C50.519 Malignant
neoplasm of lower-outer quadrant of unspecified female breast
*If a bilateral code does not exist and the condition is
bilateral, assign separate codes for both the left and right side.
For additional information related to the IBC transition to ICD-10, please
visit the ICD-10 page on
the IBC website.