I52 Other heart disorders in diseases classified elsewhere

Billable ICD-10-CM code, FY2026.

Excludes1 (never code together)

• heart disease (in):
• gonococcal infection (A54.83)
• meningococcal infection (A39.50)
• rheumatoid arthritis (M05.31)
• syphilis (A52.06)

Code first

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

Applies from I52 Other heart disorders in diseases classified elsewhere

Excludes1 (never code together)

• heart disease (in):
• gonococcal infection (A54.83)
• meningococcal infection (A39.50)
• rheumatoid arthritis (M05.31)
• syphilis (A52.06)

Code first

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

MS-DRG index

Defines the logic of DRG(s) 302-303 in MDC 05.

Approximate ICD-9-CM (GEMs)

• 429.9 Heart disease, unspecified (approximate)

Medicare Code Edits (MCE v43.1 (April 2026))

• Manifestation codes as principal diagnosis: Manifestation codes describe the manifestation of an underlying disease, not the disease itself, and are not allowed as principal diagnosis.

Diagnosis Index entries for I52

• Cardiopathy › mucopolysaccharidosis
• Disease, diseased › heart (organic) › pulmonary (chronic) › in schistosomiasis
• Disease, diseased › heart (organic) › syphilitic › congenital
• Mucopolysaccharidosis › cardiopathy
• Narrowing › artery › coronary › congenital › syphilitic
• Syphilis, syphilitic (acquired) › heart (block) (decompensation) (disease) (failure)

Nearby codes

• I52 Other heart disorders in diseases classified elsewhere (this code)