I50.33 — Acute on chronic diastolic (congestive) heart failure

I50.33

ICD-10 Chapter 9: Circulatory System — illustrative image — Chapter 9: Diseases of the circulatory system (I00–I99) — illustrative image

What this code means

Acute on chronic diastolic heart failure: a sudden worsening of long-term stiff-filling heart failure.

Also called: acute on chronic diastolic heart failure.

When this code is used

Used for acute on chronic diastolic (congestive) heart failure.

Where it sits in ICD-10-CM

Code I50.33 belongs to Chapter 9: Diseases of the circulatory system, which covers codes I00–I99 in the FY2027 ICD-10-CM tabular list. The official description above is copied verbatim from the CDC/NCHS FY2027 code file.

Related symptoms

Breathlessness

Related anatomy

Heart

Frequently asked questions

What is ICD-10-CM code I50.33?

I50.33 is the ICD-10-CM diagnosis code for “Acute on chronic diastolic (congestive) heart failure”. Acute on chronic diastolic heart failure: a sudden worsening of long-term stiff-filling heart failure.

When is code I50.33 used?

Used for acute on chronic diastolic (congestive) heart failure. It belongs to Chapter 9 of ICD-10-CM (Diseases of the circulatory system).

This guide explains ICD-10-CM codes in plain language for patients, students and other readers. It is educational information only — not coding, billing or medical advice. The code recorded for any real encounter is assigned from the full clinical documentation by the treating team and qualified coders, and only they can decide which code fits a specific case.