Alphabetic Index FY2027

I51

Complications and ill-defined descriptions of heart disease

FY2027Chapter 9: Diseases of the circulatory system/I30–I5A Other forms of heart disease

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

I51 is a non-billable ICD-10-CM code category for complications and ill-defined descriptions of heart disease. 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 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 and 5 more. Its coding notes include 11 Excludes2 entries.

Guidelines tip

From the FY2027 Official Guidelines. ICD10Ref adds no rules of its own.

Hypertension with heart failure or certain other heart conditions is assigned to category I11, with an additional code for the heart condition, unless the provider documents they are unrelated.

Guidelines I.C.9.a.1Hypertension with heart diseaseRead the official text

Excludes2

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

This code
  • heart disease specified as rheumatic (I00-I09)
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 I51 9