Coding and coverage · ICD-10-CM

I25

I25.8 Other forms of chronic ischemic heart disease

Not billable (header)Chapter 9

Report one of the more specific codes below.

Check coverage with this diagnosis

Codes under this one

  • I25.81 Atherosclerosis of other coronary vessels without angina pectorisHeader
  • I25.82 Chronic total occlusion of coronary artery
  • I25.83 Coronary atherosclerosis due to lipid rich plaque
  • I25.84 Coronary atherosclerosis due to calcified coronary lesion
  • I25.85 Chronic coronary microvascular dysfunction
  • I25.89 Other forms of chronic ischemic heart disease

Instructional notes

Chapter 9

Excludes2Not included here: the patient may have both; report both when both are present.
  • 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.-)

Section I20-I25

Code also
  • the presence of hypertension (I10-I1A)

I25

Excludes2Not included here: the patient may have both; report both when both are present.
  • non-ischemic myocardial injury (I5A)
Use additional codeAdd a second code for the full picture.
  • 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)

Chapter 9: Diseases of the circulatory system · I20-I25 Ischemic heart diseases (I20-I25)

Source: ICD-10-CM FY 2027 code descriptions and tabular list (CMS and CDC National Center for Health Statistics), effective 2026-10-01 through 2027-09-30 · CMS ICD-10 files. HCC mapping: CMS-HCC V28, payment year 2027. As of 2026-11-04.

Coverage and payment depend on the claim details; confirm with the Medicare Administrative Contractor.