2027 ICD-10-CM Diagnosis Code I42.09Other dilated cardiomyopathy
ICD-10-CM Codes›I00–I99›I30-I5A›I42
- Billable — Valid for Submission
- CC — Complication or Comorbidity
- New 2027 Code
I42.09 is a billable ICD-10-CM diagnosis code for other dilated cardiomyopathy. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 314 through 316. As a secondary diagnosis, it counts as a complication or comorbidity (CC) and moves an inpatient stay to a higher severity level within its MS-DRG family. It does not count, however, when the principal diagnosis is one of 117 closely related codes.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Cardiomyopathy caused by drug
- Cardiomyopathy due to connective tissue disease
- Cardiomyopathy due to mucopolysaccharidosis
- Cardiomyopathy due to viral infection
- Cardiomyopathy in Friedreich's ataxia
- Cardiomyopathy in myotonic dystrophy
- Cardiovascular abnormality due to infective myocarditis
- Dilated cardiomyopathy caused by anthracycline
- Dilated cardiomyopathy caused by drug
- Dilated cardiomyopathy caused by ionizing radiation
- Dilated cardiomyopathy due to amyloidosis
- Dilated cardiomyopathy due to bacterial myocarditis
- Dilated cardiomyopathy due to carnitine deficiency
- Dilated cardiomyopathy due to dermatomyositis
- Dilated cardiomyopathy due to electrolyte imbalance
- Dilated cardiomyopathy due to familial storage disease
- Dilated cardiomyopathy due to Friedreich's ataxia
- Dilated cardiomyopathy due to fungal myocarditis
- Dilated cardiomyopathy due to glycogen storage disease
- Dilated cardiomyopathy due to granuloma
- Dilated cardiomyopathy due to hemochromatosis
- Dilated cardiomyopathy due to infectious disease
- Dilated cardiomyopathy due to infiltration
- Dilated cardiomyopathy due to lysosomal storage disease
- Dilated cardiomyopathy due to malignancy
- Dilated cardiomyopathy due to metabolic disorder
- Dilated cardiomyopathy due to mitochondrial disease
- Dilated cardiomyopathy due to mucopolysaccharidosis
- Dilated cardiomyopathy due to muscular dystrophy
- Dilated cardiomyopathy due to myotonic dystrophy
- Dilated cardiomyopathy due to neuromuscular disorder
- Dilated cardiomyopathy due to nutritional deficiency
- Dilated cardiomyopathy due to parasitic myocarditis
- Dilated cardiomyopathy due to phytanic acid storage disease
- Dilated cardiomyopathy due to polyarteritis nodosa
- Dilated cardiomyopathy due to protozoan myocarditis
- Dilated cardiomyopathy due to rheumatoid arthritis
- Dilated cardiomyopathy due to sarcoidosis
- Dilated cardiomyopathy due to scleroderma
- Dilated cardiomyopathy due to systemic sclerosis
- Dilated cardiomyopathy due to taurine deficiency
- Dilated cardiomyopathy due to viral myocarditis
- Heart disease caused by ionizing radiation
- Infiltrative cardiomyopathy
- Ischemic congestive cardiomyopathy
- Ischemic dilated cardiomyopathy due to coronary artery disease
- Primary dilated cardiomyopathy
- Primary idiopathic dilated cardiomyopathy
- Secondary dilated cardiomyopathy
- Secondary nonischemic congestive cardiomyopathy
- Toxic cardiomyopathy
- Toxic dilated cardiomyopathy
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to I42.09: its own notes plus those printed at I42 and Chapter 9. A note printed at a category, block or chapter applies to every code under it.
Applicable To
Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.
- Other nonfamilial dilated cardiomyopathy
Excludes2
Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.
- certain conditions originating in the perinatal period (P04-P96)
- certain infectious and parasitic diseases (A00-B99)
- complications of pregnancy, childbirth and the puerperium (O00-O9A)
- congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
- endocrine, nutritional and metabolic diseases (E00-E88)
- injury, poisoning and certain other consequences of external causes (S00-T88)
- neoplasms (C00-D49)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
- systemic connective tissue disorders (M30-M36)
- transient cerebral ischemic attacks and related syndromes (G45.-)
Code First
The underlying condition named in the note is sequenced before this code.
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name I42.09, its category, or a range that includes it.
Applicable To 1
These notes mention I42.09.
Code First 1
These codes say to code first a condition named in the note, and I42.09 is one of the conditions named.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Clinical InformationClinical
Cardiomyopathy, Dilated
a form of cardiac muscle disease that is characterized by ventricular dilation, ventricular dysfunction, and heart failure. risk factors include smoking; alcohol drinking; hypertension; infection; pregnancy; and mutations in the lmna gene encoding lamin type a, a nuclear lamina protein.
Code History & ChangesHistory
New Code I42.09 was added to the ICD-10-CM code set for FY 2027, effective October 1, 2026.
Replacement I42.09 replaces the following previously assigned code(s):
- I42.0 - Dilated cardiomyopathy
Questions About I42.09Overview
What is the ICD-10 code for other dilated cardiomyopathy?
The ICD-10-CM code for other dilated cardiomyopathy is I42.09 (sometimes written as I4209). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is I42.09 (Dilated cardiomyopathy) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report other dilated cardiomyopathy on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does I42.09 group to?
When other dilated cardiomyopathy is the principal diagnosis on an inpatient stay, it groups to MS-DRG 314, 316, 315, with relative weights from 0.6678 to 2.0871 depending on complications. Higher weights mean higher Medicare reimbursement.
Is I42.09 a CC or MCC?
CMS lists I42.09 as a CC (complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it moves the inpatient stay to a higher-weighted DRG within its severity family. It does not count when the principal diagnosis is one of the 117 closely related codes in its exclusion list.
