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ICD-9 556.6 Conversion to ICD-10 K51.00

ICD-9 to ICD-10 Crossover Result

ICD-9 Code 556.6 representing "Univrsl ulcertve colitis" has been updated to its ICD-10 equivalent K51.00: "Ulcerative (chronic) pancolitis without complications". This crossover conversion was done using the latest General Equivalence Mappings (GEMs).

ICD‑9 Code

556.6

Univrsl ulcertve colitis

ICD‑10 Code

K51.00

Ulcerative (chronic) pancolitis without complications

Approximate Flag – This ICD-10 code does not have an exact ICD-9 equivalent. The matched code is the closest available option and may not fully capture the original diagnosis.

About the General Equivalence Mappings Crossover Tool

The General Equivalence Mappings tool is a standardized crossover resource developed by the Centers for Medicare & Medicaid Services (CMS) and the National Center for Health Statistics (NCHS). It was created to help healthcare providers, coders, payers, and software vendors accurately transition between ICD-9 and ICD-10 diagnosis codes.

This ICD-10 to ICD-9 crosswalk tool supports both forward and backward mapping, making it valuable for converting legacy data, conducting audits, updating medical coding systems, and ensuring compliance with ICD-10 standards. GEMs are especially helpful when analyzing historical claims, aligning reimbursement logic, or migrating between systems.

Because not all ICD codes have a direct match, users should interpret each mapping carefully. Some ICD-10 to ICD-9 conversions may require clinical judgment or additional documentation to ensure coding accuracy.