ICD-9 1984 Code Mapping

Terms & Definitions

Alternative: Single ICD-10 code reproduces the complete meaning of one ICD-9 code. Cluster: Multiple ICD-10 codes representing single ICD-9 code. At times it requires multiple ICD-10 codes combined to reproduce the complete meaning of one ICD-9 code. Mapping Types: "Single Code-to-Single Code", "Single Code-to-Cluster", "Cluster-to-Single Code". Note: More than one ICD-10 code (cluster) may be a valid translation of a given ICD-9 code. Which one of those ICD-10 codes (clusters) is the most correct translation must be determined based on the clinical case.

ICD-9 1984 to ICD-10 Mapping Options

Recommended Mapping (based on statistical analysis)
Source ICD-9	Mapping Type	Target ICD-10
1984 (Diagnosis) - Sec malig neo nerve NEC (Secondary malignant neoplasm of other parts of nervous system)	Single To Single	C7932 (Diagnosis) - Secondary malignant neoplasm of cerebral meninges
CMS/CDC General Equivalence Mappings
1984 (Diagnosis) - Sec malig neo nerve NEC (Secondary malignant neoplasm of other parts of nervous system)	Single To Single	Alternative #1: C7932 (Diagnosis) - Secondary malignant neoplasm of cerebral meninges
	Single To Single	Alternative #2: C7949 (Diagnosis) - Secondary malignant neoplasm of oth parts of nervous system (Secondary malignant neoplasm of other parts of nervous system)
	Single To Single	Alternative #3: C7940 (Diagnosis) - Secondary malignant neoplasm of unsp part of nervous system (Secondary malignant neoplasm of unspecified part of nervous system)