Alphabetic Index FY2027

I27.83

Eisenmenger's syndrome

FY2027Chapter 9: Diseases of the circulatory system/I26–I28 Pulmonary heart disease and diseases of pulmonary circulation

BillableComplete code, valid to report
Care settingsHome Health Primary · MMTA - Cardiac and Circulatory

I27.83 (also written I2783) is a billable ICD-10-CM diagnosis code for eisenmenger's syndrome. It is part of the FY2027 code set, effective October 1, 2026. It is one of the 17 codes in category I27 (Other pulmonary heart diseases). The Alphabetic Index lists it under 5 entries. 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.

This code
  • underlying heart defect, if known, such as:
    • atrial septal defect (Q21.1-)
    • Eisenmenger's defect (Q21.8)
    • patent ductus arteriosus (Q25.0)
    • ventricular septal defect (Q21.0)

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.-)

Care settings

How CMS programs treat this code. These are CMS claim edits and list entries, not coverage or eligibility rules.

Home Health Primary

Accepted as the primary (principal) diagnosis on a home health claim. The Home Health Grouper assigns it to the MMTA - Cardiac and Circulatory clinical group.

Source: CMS Home Health Grouper Software v07.2.26, effective October 1, 2026

Inclusion terms

Conditions classified to this code.

This code
  • Eisenmenger's complex
  • (Irreversible) Eisenmenger's disease
  • Pulmonary hypertension with right to left shunt related to congenital heart disease

Alphabetic Index terms

Terms the official Alphabetic Index lists for this code. 5 entries