All ICD10 Codes
I52Billable, valid for claims from October 1, 2026

Other heart disorders in diseases classified elsewhere

In Other forms of heart disease (I30-I5A), chapter 9: Diseases of the Circulatory System

  • I52 is billable and valid on claims for FY 2027. If the record has more detail, check the other codes under I30-I5A below.
  • As a secondary diagnosis it is not a CC or MCC, so it doesn't raise the MS-DRG payment.
  • Doesn't count toward a Medicare Advantage risk score (no HCC in V28).
  • AHRQ's Chronic Condition Indicator classes it as not chronic (an acute or short-term condition).
  • Can't be the principal diagnosis: code the underlying condition first. (Manifestation list)

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Instructional notes

Excludes1: not coded here, use a different code

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

Code first: code the underlying condition first, then this code

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

Official coding guidelines

From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.

Covers hypertension with heart and kidney disease, coronary artery disease with angina, perioperative stroke, cerebrovascular sequelae, and acute myocardial infarction types and timing.

Read Section I.C.9 (page 50)

Other codes under I30-I5A

Other forms of heart disease (I30-I5A)

I52 MS-DRGs

As the principal diagnosis, I52 groups to MS-DRG 302 or 303 (v44.0). Which one applies depends on procedures performed, secondary diagnoses (CC/MCC), and the patient's age and discharge status.

Related conditions

Grouped by AHRQ's Clinical Classifications Software Refined (CCSR), which sorts every diagnosis code into clinically meaningful categories.

I52 is in Other and ill-defined heart disease (CIR015), with 36 codes. Others in it:

  • I25.3 Aneurysm of heart
  • I25.41 Coronary artery aneurysm
  • I51.0 Cardiac septal defect, acquired
  • I51.1 Rupture of chordae tendineae, not elsewhere classified
  • I51.2 Rupture of papillary muscle, not elsewhere classified
  • I51.3 Intracardiac thrombosis, not elsewhere classified
  • I51.5 Myocardial degeneration
  • I51.7 Cardiomegaly

Medicare coverage articles listing I52

These 5 Medicare billing and coding articles list I52 as a diagnosis that supports medical necessity for the services they cover. From the CMS Medicare Coverage Database; check your own contractor's article before billing.

About the condition

Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.

Heart Diseases

Heart disease is a general term that includes many types of heart problems. It's a type of cardiovascular disease, which means heart and blood vessel disease.

Read more about heart diseases on MedlinePlus

Code history

Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.

ICD-9-CM equivalent

Legacy crosswalk from the CMS General Equivalence Mappings (last updated 2018).

  • 429.9 Heart disease, unspecified (approximate)
ICD-9 to ICD-10 converter