2020 ICD-10-CM Diagnosis Code I25.9

Chronic ischemic heart disease, unspecified

    2016 2017 2018 2019 2020 Billable/Specific Code
  • I25.9 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • The 2020 edition of ICD-10-CM I25.9 became effective on October 1, 2019.
  • This is the American ICD-10-CM version of I25.9 - other international versions of ICD-10 I25.9 may differ.
Applicable To
  • Ischemic heart disease (chronic) NOS
The following code(s) above I25.9 contain annotation back-references
Annotation Back-References
In this context, annotation back-references refer to codes that contain:
  • Applicable To annotations, or
  • Code Also annotations, or
  • Code First annotations, or
  • Excludes1 annotations, or
  • Excludes2 annotations, or
  • Includes annotations, or
  • Note annotations, or
  • Use Additional annotations
that may be applicable to I25.9:
  • I00-I99
    2020 ICD-10-CM Range I00-I99

    Diseases of the circulatory system

    Type 2 Excludes
    • 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.-)
    Diseases of the circulatory system
  • I20-I25
    2020 ICD-10-CM Range I20-I25

    Ischemic heart diseases

    Use Additional
    • code to identify presence of hypertension (I10-I16)
    Ischemic heart diseases
  • I25
    ICD-10-CM Diagnosis Code I25

    Chronic ischemic heart disease

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Use Additional
    • 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)
    Chronic ischemic heart disease
Approximate Synonyms
  • Chronic ischemic heart disease
ICD-10-CM I25.9 is grouped within Diagnostic Related Group(s) (MS-DRG v37.0):
  • 302 Atherosclerosis with mcc
  • 303 Atherosclerosis without mcc

Convert I25.9 to ICD-9-CM

Code History
  • 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
  • 2017 (effective 10/1/2016): No change
  • 2018 (effective 10/1/2017): No change
  • 2019 (effective 10/1/2018): No change
  • 2020 (effective 10/1/2019): No change
Code annotations containing back-references to I25.9:
  • Type 1 Excludes: I24.9
    ICD-10-CM Diagnosis Code I24.9

    Acute ischemic heart disease, unspecified

      2016 2017 2018 2019 2020 Billable/Specific Code
    Type 1 Excludes
    • ischemic heart disease (chronic) NOS (I25.9)

Diagnosis Index entries containing back-references to I25.9:
  • Deformity Q89.9
    ICD-10-CM Diagnosis Code Q89.9

    Congenital malformation, unspecified

      2016 2017 2018 2019 2020 Billable/Specific Code POA Exempt
    Applicable To
    • Congenital anomaly NOS
    • Congenital deformity NOS
    • artery (congenital) (peripheral) Q27.9
      ICD-10-CM Diagnosis Code Q27.9

      Congenital malformation of peripheral vascular system, unspecified

        2016 2017 2018 2019 2020 Billable/Specific Code POA Exempt
      Applicable To
      • Anomaly of artery or vein NOS
    • coronary artery (acquired) I25.9
  • Disease, diseased - see also Syndrome
    • heart (organic) I51.9
      ICD-10-CM Diagnosis Code I51.9

      Heart disease, unspecified

        2016 2017 2018 2019 2020 Billable/Specific Code
      • ischemic (chronic or with a stated duration of over 4 weeks) I25.9
  • Ischemia, ischemic I99.8
    ICD-10-CM Diagnosis Code I99.8

    Other disorder of circulatory system

      2016 2017 2018 2019 2020 Billable/Specific Code

ICD-10-CM Codes Adjacent To I25.9
I25.799 Atherosclerosis of other coronary artery bypass graft(s) with unspecified angina pectoris
I25.8 Other forms of chronic ischemic heart disease
I25.81 Atherosclerosis of other coronary vessels without angina pectoris
I25.810 Atherosclerosis of coronary artery bypass graft(s) without angina pectoris
I25.811 Atherosclerosis of native coronary artery of transplanted heart without angina pectoris
I25.812 Atherosclerosis of bypass graft of coronary artery of transplanted heart without angina pectoris
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
I25.89 Other forms of chronic ischemic heart disease
I25.9 Chronic ischemic heart disease, unspecified
I26 Pulmonary embolism
I26.0 Pulmonary embolism with acute cor pulmonale
I26.01 Septic pulmonary embolism with acute cor pulmonale
I26.02 Saddle embolus of pulmonary artery with acute cor pulmonale
I26.09 Other pulmonary embolism with acute cor pulmonale
I26.9 Pulmonary embolism without acute cor pulmonale
I26.90 Septic pulmonary embolism without acute cor pulmonale
I26.92 Saddle embolus of pulmonary artery without acute cor pulmonale
I26.93 Single subsegmental pulmonary embolism without acute cor pulmonale
I26.94 Multiple subsegmental pulmonary emboli without acute cor pulmonale

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.