As of October 2015, ICD-9 codes are no longer used for medical coding. Instead, use the following two equivalent ICD-10-CM codes, which are an approximate match to ICD-9 code 424.0:
Billable codes are sufficient justification for admission to an acute care hospital when used a principal diagnosis.
424.0 is a legacy non-billable code used to specify a medical diagnosis of mitral valve disorders. This code was replaced on September 30, 2015 by its ICD-10 equivalent.
Code also note - A "code also" note instructs that two codes may be required to fully describe a condition, but this note does not provide sequencing direction.
NOS "Not otherwise specified" - This abbreviation is the equivalent of unspecified.
424.0 is a legacy non-billable code used to specify a medical diagnosis of mitral valve disorders. This code was replaced on September 30, 2015 by its ICD-10 equivalent.
Code also note - A "code also" note instructs that two codes may be required to fully describe a condition, but this note does not provide sequencing direction.
NOS "Not otherwise specified" - This abbreviation is the equivalent of unspecified.