I52Other heart disorders in diseases classified elsewhere

I52 is the ICD-10-CM diagnosis code for other heart disorders in diseases classified elsewhere. It belongs to block I30-I5A (other forms of heart disease) and chapter 9 (diseases of the circulatory system). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Don't report I52 together with the conditions in its Excludes1 note: gonococcal infection (A54.83), meningococcal infection (A39.50), rheumatoid arthritis (M05.31) and syphilis (A52.06).

Code first underlying disease, such as: congenital syphilis (A50.5), mucopolysaccharidosis (E76.3) and schistosomiasis (B65.0-B65.9).

It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.

In MS-DRG v44.0, it is part of the grouping logic for DRG 302 (Atherosclerosis with MCC, relative weight 1.1984) and DRG 303 (Atherosclerosis without MCC, relative weight 0.6612), in MDC 05 (Diseases and Disorders of the Circulatory System), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

It is a manifestation code, so it describes the effect of an underlying disease and can't be the principal diagnosis. Code the underlying condition first.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as 429.9 (heart disease, unspecified).