2026 ICD-10-CM Diagnosis Code I52Other heart disorders in diseases classified elsewhere
ICD-10-CM Codes›I00–I99›I30-I5A›I52
- Billable — Valid for Submission
- Not Chronic
I52 is a billable ICD-10-CM diagnosis code for other heart disorders in diseases classified elsewhere. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 302 through 303. The code is a manifestation code that cannot be reported as the principal diagnosis. Coders also document this condition as diffuse disease of coronary artery. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other and ill-defined heart disease.
Code Identity
Code Classification
Code EditsBilling
Medicare Code Editor checks that affect claim validity for I52.
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Diffuse disease of coronary artery
- Disorder of heart due to systemic lupus erythematosus
- Ectatic coronary artery
- Luminal irregularities of coronary artery
- Mild intimal coronary irregularities without significant stenoses
- Restenotic lesion of coronary artery
- Subpulmonary stenosis
- Ulcer of artery
- Ulcerated lesion of coronary artery
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Code First
- underlying disease, such as:
- congenital syphilis A50.5
- mucopolysaccharidosis E76.3
- schistosomiasis B65.0 B65.9
Type 1 Excludes
- heart disease (in):
- gonococcal infection A54.83
- meningococcal infection A39.50
- rheumatoid arthritis M05.31
- syphilis A52.06
Certain conditions have both an underlying etiology and multiple body system manifestations due to the underlying etiology. For such conditions, the ICD-10-CM has a coding convention that requires the underlying condition be sequenced first followed by the manifestation. Wherever such a combination exists, there is a "use additional code" note at the etiology code, and a "code first" note at the manifestation code. These instructional notes indicate the proper sequencing order of the codes, etiology followed by manifestation.
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
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.
The full article covers:
- What is heart disease?
- What are the types of heart disease?
- What causes heart diseases?
- Who is more likely to develop heart diseases?
- What are the symptoms of heart disease?
- How are heart diseases diagnosed?
- What are the treatments for heart disease?
- Can heart diseases be prevented?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert I52 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About I52Overview
Is I52 (Other heart disorders in diseases classified elsewhere) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report other heart disorders in diseases classified elsewhere on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does I52 group to?
On inpatient claims, other heart disorders in diseases classified elsewhere maps to MS-DRG 302, 303, with relative weights from 0.6732 to 1.1966 depending on complications. Higher weights mean higher Medicare reimbursement.
Can I52 be a principal diagnosis?
No. This is a manifestation code: other heart disorders in diseases classified elsewhere describes the manifestation of an underlying disease rather than the disease itself, so the underlying condition is sequenced first.
What is the ICD-9 equivalent of I52?
Under the General Equivalence Mappings, other heart disorders in diseases classified elsewhere converts to ICD-9-CM 429.9 (heart disease NOS). The mapping is approximate, so confirm the match fits the documentation.
Footnotes
[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.
