ICD-10 F29 Conversion to ICD-9 298.9

ICD-10 to ICD-9 Crossover Result

ICD-10 Code F29 representing "Unsp psychosis not due to a substance or known physiol cond" can be backward-mapped to its ICD-9 equivalent 298.9: "Psychosis NOS". This crossover conversion was done using the latest General Equivalence Mappings (GEMs), please review the conversion table below for additional details.

Source ICD-10 Code		Target ICD-9 Code
F29 Unsp psychosis not due to a substance or known physiol cond		298.9 Psychosis NOS
Approximate Flag - The approximate mapping means there is not an exact match between the ICD-10 and ICD-9 codes and the mapped code is not a precise representation of the original code.

About the General Equivalence Mappings Crossover Tool

The General Equivalence Mappings (GEMs) is a crossover mapping tool designed to facilitate the transition between the ICD-9 and ICD-10 coding systems. This crossover tool was developed by the Centers for Medicare & Medicaid Services (CMS) and the National Center for Health Statistics (NCHS), GEMs serve as a standardized reference for converting diagnosis codes between the two major ICD versions.

The GEMs were created to support healthcare organizations, providers, and payers in the adoption of ICD-10 by providing a structured framework for mapping codes accurately. GEMs are particularly useful for legacy data conversion, research, and system updates to ensure compliance with ICD-10 requirements. They can be used in both forward mapping (ICD-9 to ICD-10) and backward mapping (ICD-10 to ICD-9), making them versatile for various applications, such as auditing, reimbursement analysis, and cross-system compatibility.

Users need to use their best judgements when using this conversion tool and carefully interpret the mappings, as not all conversions are one-to-one; some codes may require additional clinical context for accuracy.