Alphabetic Index FY2027

I25.84

Coronary atherosclerosis due to calcified coronary lesion

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

BillableComplete code, valid to report
Care settingsHospice: not accepted as primary

I25.84 (also written I2584) is a billable ICD-10-CM diagnosis code for coronary atherosclerosis due to calcified coronary lesion. It is part of the FY2027 code set, effective October 1, 2026. It is one of the 56 codes in category I25 (Chronic ischemic heart disease). The Alphabetic Index lists it under 2 entries. Its coding notes include a Code first instruction, a Use additional code instruction, a Code also instruction and 11 Excludes2 entries.

Code first

If the underlying condition listed here is present and known, sequence it first.

This code

Use additional code

Add the listed code as a secondary code, if known.

Inherited from I25 Chronic ischemic heart disease
  • code to identify:
    • chronic total occlusion of coronary artery (I25.82)
    • exposure to environmental tobacco smoke (Z77.22)
    • history of tobacco dependence (Z87.891)
    • occupational exposure to environmental tobacco smoke (Z57.31)
    • tobacco dependence (F17.-)
    • tobacco use (Z72.0)

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.

Inherited from I25 Chronic ischemic heart disease
  • non-ischemic myocardial injury (I5A)
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.

Hospice: not accepted as primary

Not accepted as the principal diagnosis on a hospice claim (bill types 081x and 082x). The Integrated OCE returns an edit for this code.
Reason: Supplementary or additional code, not allowed as principal diagnosis.

Source: CMS Integrated Outpatient Code Editor (IOCE) v27.3, effective October 1, 2026, edit 113

Inclusion terms

Conditions classified to this code.

This code
  • Coronary atherosclerosis due to severely calcified coronary lesion

Alphabetic Index terms

Terms the official Alphabetic Index lists for this code. 2 entries