Alphabetic Index FY2027

I23

Certain current complications following ST elevation (STEMI) and non-ST elevation (NSTEMI) myocardial infarction (within the 28 day period)

FY2027Chapter 9: Diseases of the circulatory system/I20–I25 Ischemic heart diseases

Non-billable headerNot valid on its own. Use one of the more specific codes under it.

I23 is a non-billable ICD-10-CM code category for certain current complications following ST elevation (STEMI) and non-ST elevation (NSTEMI) myocardial infarction (within the 28 day period). Report a more specific code from it instead. It is part of the FY2027 code set, effective October 1, 2026. The more specific codes under it are I23.0 Hemopericardium as current complication following acute myocardial infarction, I23.1 Atrial septal defect as current complication following acute myocardial infarction, I23.2 Ventricular septal defect as current complication following acute myocardial infarction, I23.3 Rupture of cardiac wall without hemopericardium as current complication following acute myocardial infarction and 5 more. Its coding notes include a Code also instruction and 10 Excludes2 entries.

Code also

Two codes may be needed to describe the condition. This note gives no sequencing order.

Also from chapter/block level (1 note)
Inherited from I20–I25 Ischemic heart diseases
  • the presence of hypertension (I10-I1A)

Excludes2

Not included here. Both codes may be reported if the patient has both conditions.

Also from chapter/block level (10 notes)
Inherited from Chapter 9 Diseases of the circulatory system
  • 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.-)

More specific codes under I23 9