ICD-10 Code for Ischemia

The default ICD-10-CM 2027 code for ischemia, ischemic is I99.8 – Other disorder of circulatory system. More specific codes depend on the details documented, as listed in the official index (30 codes, 29 billable).

Main code: I99.8 – Other disorder of circulatory system
Billable: Yes

Index entries for Ischemia

brain – see Ischemia, cerebral
bowel (transient)
- acute – K55.059 – see also Ischemia, intestine, acute
- chronic – K55.1
- due to mesenteric artery insufficiency – K55.1
cardiac (see Disease, heart, ischemic)
cardiomyopathy – I25.5
cerebral (chronic) (generalized) – I67.82
- arteriosclerotic – I67.2
- intermittent – G45.9
- newborn – P91.0
- recurrent focal – G45.8
- transient – G45.9
colon chronic (due to mesenteric artery insufficiency) – K55.1
coronary – see Disease, heart, ischemic
demand (coronary) – I24.89 – see also Angina
- with myocardial infarction – I21.A1
- resulting in myocardial infarction – I21.A1
heart (chronic or with a stated duration of over 4 weeks) – I25.9
- acute or with a stated duration of 4 weeks or less – I24.9
- subacute – I24.9
infarction, muscle – see Infarct, muscle
intestine (large) (small) (transient) – K55.9
- acute – K55.059
  - diffuse – K55.052
  - focal – K55.051
  - large – K55.039
    - diffuse – K55.032
    - focal – K55.031
  - small – K55.019
    - diffuse – K55.012
    - focal – K55.011
- chronic – K55.1
- due to mesenteric artery insufficiency – K55.1
kidney – N28.0
limb, critical – see Arteriosclerosis, with critical limb ischemia
limb-threatening, chronic – see Arteriosclerosis, with critical limb ischemia
mesenteric, acute – K55.059 – see also Ischemia, intestine, acute
muscle, traumatic – T79.6 (header)
myocardium, myocardial (chronic or with a stated duration of over 4 weeks) – I25.9
- acute, without myocardial infarction – I51.3
- silent (asymptomatic) – I25.6
- transient of newborn – P29.4
nipple, intraoperative and postprocedural – N99.860
renal – N28.0
retina, retinal – see Occlusion, artery, retina
small bowel
- acute – K55.019
  - diffuse – K55.012
  - focal – K55.011
- chronic – K55.1
- due to mesenteric artery insufficiency – K55.1
spinal cord – G95.11
subendocardial – see Insufficiency, coronary
supply (coronary) – I25.9 – see also Angina
- due to vasospasm – I20.1

How to choose the right code

Start with the main term, then pick the indented subterm that matches the documentation (type, cause, site, laterality, episode of care). Always confirm the code in the tabular list: follow its Excludes1/Excludes2, “code first” and “use additional code” notes, and add a 7th character where required.

Source: CDC/NCHS ICD-10-CM FY2027 alphabetic index.